Honda-SOHC

SOHC.co.uk Forums => Project Board => Topic started by: Rob62 on August 30, 2017, 10:01:55 PM

Title: CB750K4 New project
Post by: Rob62 on August 30, 2017, 10:01:55 PM
So here she is, my new winter project complete with strange trumpet style exhausts which sound quite good but will be getting replaced, big wide USA style bars, engine bars in decent nick may keep them, pattern seat looks brand new with metal base. In remarkable condition for her age 44! One or two bits missing / non std but not too much. Wont be doing a nut & bolt resto, just a clean up and repair, i like a bit of original patina and she will be a tidy rider like my other bikes, not a show winner.  Gonna keep me busy for a while i think.... Overall I'm quite happy 😊

(https://s19.postimg.cc/tgo3dvwsj/IMG_0521.jpg) (https://postimages.org/)

(https://s19.postimg.cc/qsyn3j3r7/IMG_0517.jpg) (https://postimages.org/)
Dodgy non standar rear shocks will be getting replaced
(https://s19.postimg.cc/rh7hmh2gz/IMG_0518.jpg) (https://postimages.org/)
Rear mudguard and light assembly almost perfect
(https://s19.postimg.cc/sbu18iabn/IMG_0519.jpg) (https://postimages.org/)
Couple of dents in front mudguard which i may be able to smooth out, chrome is sound
(https://s19.postimg.cc/ccbdoye9v/IMG_0520.jpg) (https://postimages.org/)
One or two marks in the paint...may go for a respray and change of colour ?
(https://s19.postimg.cc/qlflkri6b/IMG_0522.jpg) (https://postimages.org/)

(https://s19.postimg.cc/zci11ac3n/IMG_0525.jpg) (https://postimages.org/)

(https://s19.postimg.cc/lt5s9bnib/IMG_0513.jpg) (https://postimages.org/)
Hardly any wear on the front disk, no ridges....
(https://s19.postimg.cc/8ayvx1bcz/IMG_0526.jpg) (https://postimages.org/)

(https://s19.postimg.cc/8l6egdpz7/IMG_0527.jpg) (https://postimages.org/)

(https://s19.postimg.cc/qzgxkd29v/IMG_0529.jpg) (https://postimages.org/)
Hornets nest under the rear light assembly,,, fortunately the occupants were long gone.
(https://s19.postimg.cc/cito5scsj/IMG_0534.jpg) (https://postimages.org/)

(https://s19.postimg.cc/v8q909uwz/IMG_0536.jpg) (https://postimages.org/)

(https://s19.postimg.cc/p3u597dfn/IMG_0537.jpg) (https://postimages.org/)

(https://s19.postimg.cc/vmrkzvf0j/IMG_0539.jpg) (https://postimages.org/)

(https://s19.postimg.cc/6qy5cdscj/IMG_0541.jpg) (https://postimages.org/)

(https://s19.postimg.cc/p2k7fsblv/IMG_0542.jpg) (https://postimages.org/)

(https://s19.postimg.cc/cdpww45hf/IMG_0543.jpg) (https://postimages.org/)

(https://s19.postimg.cc/77jcytg3n/IMG_0544.jpg) (https://postimages.org/)

(https://s19.postimg.cc/er7un4jwj/IMG_0545.jpg) (https://postimages.org/)
Title: Re: CB750K4 New project
Post by: Trigger on August 30, 2017, 10:10:06 PM
Love the hornets, you may find them in your headlight bowl  ;)
Title: Re: CB750K4 New project
Post by: AshimotoK0 on August 30, 2017, 10:29:24 PM
Nice find ...That Asahi Denso filler cap is worth  a lot of money. The plastic lens always yellows but there is a clock glass on eBay that costs peanuts and fits perfectly bonded in with semi-flex ultra clear epoxy. Mine sold within 1 hour on Ebay for £100 to a guy in Japan.  I found  two dried up Idaho wasps  inside the crankcases of my '69 CB350.
Title: Re: CB750K4 New project
Post by: Trigger on August 30, 2017, 10:35:31 PM
Found a gold and diamond ring in the bottom of a CB550F1 air box that came from the states. Strange what you find on and in old bikes.
Title: Re: CB750K4 New project
Post by: AshimotoK0 on August 30, 2017, 10:39:06 PM
Found a gold and diamond ring in the bottom of a CB550F1 air box that came from the states. Strange what you find on and in old bikes.

You 'poppin' the question' then Trig  ;)
Title: Re: CB750K4 New project
Post by: Trigger on August 30, 2017, 10:48:09 PM
Found a gold and diamond ring in the bottom of a CB550F1 air box that came from the states. Strange what you find on and in old bikes.

You 'poppin' the question' then Trig  ;)

It was a wedding ring mate  ::)
A mate of mine found a $50 note rolled up in the handle bars of a bike he imported.
Title: Re: CB750K4 New project
Post by: AshimotoK0 on August 30, 2017, 10:51:06 PM
Found a gold and diamond ring in the bottom of a CB550F1 air box that came from the states. Strange what you find on and in old bikes.

You 'poppin' the question' then Trig  ;)

It was a wedding ring mate  ::)
A mate of mine found a $50 note rolled up in the handle bars of a bike he imported.

Hmm ..back in my romantic days .... wedding rings were gold bands and engagement/eternity rings had diamonds in 'em  ;)
Title: Re: CB750K4 New project
Post by: mike the bike on August 30, 2017, 10:53:56 PM
I like your thinking: keep it as is, enjoy riding it.
Title: Re: CB750K4 New project
Post by: Trigger on August 30, 2017, 10:55:24 PM
Found a gold and diamond ring in the bottom of a CB550F1 air box that came from the states. Strange what you find on and in old bikes.

You 'poppin' the question' then Trig  ;)

It was a wedding ring mate  ::)
A mate of mine found a $50 note rolled up in the handle bars of a bike he imported.

Hmm ..back in my romantic days .... wedding rings were gold bands and engagement/eternity rings had diamonds in 'em  ;)

Not in the states, sold it to jewellery John and he told me it was a wedding ring and gave me a hand full of shrapnel  ;D
Title: Re: CB750K4 New project
Post by: Rob62 on August 30, 2017, 11:14:36 PM
Nice find ...That Asahi Denso filler cap is worth  a lot of money. The plastic lens always yellows but there is a clock glass on eBay that costs peanuts and fits perfectly bonded in with semi-flex ultra clear epoxy. Mine sold within 1 hour on Ebay for £100 to a guy in Japan.  I found  two dried up Idaho wasps  inside the crankcases of my '69 CB350.
Thanks for the info.... i knew it wasn't a std filler cap but didn't realise it was valuable... If it works ok I'll keep it, if not i may try to sell it. Hopefully there wont be any more wasps but im worried about the airbox and the headlamp bowl now  :o
Title: Re: CB750K4 New project
Post by: hairygit on August 31, 2017, 07:30:10 AM
Nice find ...That Asahi Denso filler cap is worth  a lot of money. The plastic lens always yellows but there is a clock glass on eBay that costs peanuts and fits perfectly bonded in with semi-flex ultra clear epoxy. Mine sold within 1 hour on Ebay for £100 to a guy in Japan.  I found  two dried up Idaho wasps  inside the crankcases of my '69 CB350.
Thanks for the info.... i knew it wasn't a std filler cap but didn't realise it was valuable... If it works ok I'll keep it, if not i may try to sell it. Hopefully there wont be any more wasps but im worried about the airbox and the headlamp bowl now  :o
It'll drive you nuts on the road, there is a plastic/resin float attached by a chain in the tank. As you ride along you get a strange clunking/thumping noise (depends on how full the tank is) that drives you nuts, caused by the float thing moving about and bumping the inside of the tank!

Sent from my X6pro using Tapatalk

Title: Re: CB750K4 New project
Post by: AshimotoK0 on August 31, 2017, 06:56:02 PM
Nice find ...That Asahi Denso filler cap is worth  a lot of money. The plastic lens always yellows but there is a clock glass on eBay that costs peanuts and fits perfectly bonded in with semi-flex ultra clear epoxy. Mine sold within 1 hour on Ebay for £100 to a guy in Japan.  I found  two dried up Idaho wasps  inside the crankcases of my '69 CB350.
Thanks for the info.... i knew it wasn't a std filler cap but didn't realise it was valuable... If it works ok I'll keep it, if not i may try to sell it. Hopefully there wont be any more wasps but im worried about the airbox and the headlamp bowl now  :o
It'll drive you nuts on the road, there is a plastic/resin float attached by a chain in the tank. As you ride along you get a strange clunking/thumping noise (depends on how full the tank is) that drives you nuts, caused by the float thing moving about and bumping the inside of the tank!

Sent from my X6pro using Tapatalk

Totally agree but for some reason the Japanese love em. The one they did for the Z1 is even more valuable!

http://www.ebay.ie/itm/Vintage-Used-KAWASAKI-ASAHI-DENSO-GAS-CAP-K-7-Z1-900-Z2-750-H1-500-H2-S1-S3-400-/162625011445?hash=item25dd34bef5:g:eGMAAOSw66pZi4J3
Title: Re: CB750K4 New project
Post by: Rob62 on September 29, 2017, 08:22:56 PM
Spoke to the DVLA a few days ago about getting an age related registration number. I told them that as far as I know Honda wouldn't confirm the age of the bike as it isn't  a uk model, as i had been told by DK and also on Honda uk website. I wanted to confirm that they would accept a dating letter from the vjmc before I shelled out for one. The woman on the phone told me i could use a vjmc letter but that i would also need to provide a letter from Honda saying why they couldn't date the bike...  she also said I would need the nova letter...although you dont actually need to send it, you just ned to know that it has been processed...

So today I called Honda UK to ask for a letter. I was surprised to be told by the customer services that if i send details of the model, the engine and chassis number along with a cheque for £30 they will provide the service.... thats not what i had expected them to say. So this afty i sent off the letter and cheque and will wait to see what happens.....according to them it can take upto 6 weeks.
Title: Re: CB750K4 New project
Post by: Rob62 on October 18, 2017, 07:10:29 PM
Got a reply from Honda UK today. DK were right, they say they cant date the bike as its not on their database.... So now I can get the VJMC to date it for me. What I dont understand is why the customer services operator told me they could date a USA bike when in fact they cant, still at least I now have a letter from them to send off to the DVLA... Honda also sent the cheque back btw...
Title: Re: CB750K4 New project
Post by: Nurse Julie on October 18, 2017, 07:18:37 PM
Can I just ask, purely out of interest, if Honda UK can't date it, how do the VJMC date it?
Title: Re: CB750K4 New project
Post by: Rob62 on October 18, 2017, 09:35:54 PM
I think Honda UK wont date it because its not an official UK import and thus not on their database, wheras the vjmc presumably wont limit themselves to UK bikes... The funny thing is that its clearly a Honda and the vin number is clearly stamped and also the month and year of manufacture on the vin plate (dec 1973).... plus it looks like a 1973/4 model.... anybody could date it, its all there... Its just a game at the end of the day i guess.. anyway fingers crossed, ill try the vjmc next... I dont want to end up with a Q plate  :-\
Title: Re: CB750K4 New project
Post by: Nurse Julie on October 18, 2017, 09:43:41 PM
Like you say, it's really an unnecessary paperwork exercise as we all know what it is. I haven't seen a Q plate vehicle of any description for yonks now. I suppose it's so much easier these days to get an age related plate issued for a non substantially changed vehicle. Fingers crossed it all sorts itself out soon.
Title: Re: CB750K4 New project
Post by: Rob62 on October 18, 2017, 10:17:54 PM
Cheers julie, i sure hope so.... gotta get her fettled and mot’d first though. Once i get the front room decorated i can make a start  :(
Title: Re: CB750K4 New project
Post by: Nurse Julie on October 18, 2017, 10:21:06 PM
 ;D ;D ;D ;D Nothing worse than real life getting in the way of bike fettling !!!
Title: Re: CB750K4 New project
Post by: K2-K6 on October 19, 2017, 07:45:31 AM
Is the front room to keep the bike in Rob?  :)

My kids still can't quite believe that when we visited my friend he keeps his Ducati in the dining room.
Title: Re: CB750K4 New project
Post by: AshimotoK0 on October 19, 2017, 08:14:06 AM
Well if it's good enough for Sting  :)

[attachimg=1]
Title: Re: CB750K4 New project
Post by: Tomb on October 19, 2017, 08:46:18 AM
OOHH I've got one of them!

(https://farm5.staticflickr.com/4500/37482664090_067d84f698_b.jpg)
Title: Re: CB750K4 New project
Post by: AshimotoK0 on October 19, 2017, 09:04:48 AM
OOHH I've got one of them!


Nice one !

Evidently, Stings machine was personally stripped and rebuilt by the man himself. Apparently his bike was stored in his front room for years on his way up through to stardom.
Title: Re: CB750K4 New project
Post by: Bryanj on October 19, 2017, 09:26:48 AM
VJMC and other dating services have micrfiches, once supplied by Honda, that list all numbers against MODEL years, which can be the year after build but thats OKif the model year is over 40 anyway.Very similar to the paper ID book that i have part number 2GMASOO-AH If it is still available.

EDIT, part number doesn't come up but isbn does. If you want heart failure try looking at the following link. I paid less than £20 for mine!

https://uk.nicebooks.com/book/9132130
Title: Re: CB750K4 New project
Post by: K2-K6 on October 19, 2017, 09:34:34 AM
Would that be Tantric mechanicing Ash?  ;D
Title: Re: CB750K4 New project
Post by: Rob62 on October 19, 2017, 01:00:46 PM
Is the front room to keep the bike in Rob?  :)

My kids still can't quite believe that when we visited my friend he keeps his Ducati in the dining room.

Sadly not... although i do have a mk11 raleigh chopper and a vindec high-riser in the conservatory, much to the displeasure of my missus  :D ...both fully restored too
Title: Re: CB750K4 New project
Post by: Rob62 on October 19, 2017, 01:02:40 PM
Well if it's good enough for Sting  :)

(Attachment Link)

Nice wellies  ::)
Title: Re: CB750K4 New project
Post by: K2-K6 on October 19, 2017, 03:55:29 PM
Bit of a thread twist there, but have you seen one of these,  photo attached.
Title: Re: CB750K4 New project
Post by: Woodside on October 19, 2017, 04:29:46 PM
i had somthing along those lines when i was 13ish...my old man got it from the local dump
it had girder forks and leaf spring on the rear..which me and my mate snapped on a few occasions and my dad welded it up each time getting stiffer and stiffer..and everytime shredding the rear tyre
never seen one since but would love too..all i remember is it was blue and weighed a bloody ton
Title: Re: CB750K4 New project
Post by: K2-K6 on October 19, 2017, 04:46:33 PM
This one is a Motobecane as in french scooters. Monoshock with coil spring and cast aluminium wheels containing drummed brakes.
I was always trying to make something like this as a kid but without any real facilities.

Funny about their welding,  my dad was always welding stuff when I was younger.
Title: Re: CB750K4 New project
Post by: Woodside on October 19, 2017, 05:37:58 PM
i have absolutely no idea what make mine was i always thought it may have been american....it had a slightly longer seat which is why we were always 2's up....
i think it had a twin oval top tube too...
just spent half an hour looking at pics on net but nothing even close...
Title: Re: CB750K4 New project
Post by: K2-K6 on October 19, 2017, 06:10:11 PM
Think my first bike came from Bracknell amenity recycling center, as it's now known, aka the tip but I was too exited to get out on it to wonder where it came from I guess.

We also grew up initially believing that Frencham little pond was the seaside,  local joke for anyone in that vicinity.
Title: Re: CB750K4 New project
Post by: K2-K6 on October 19, 2017, 06:24:24 PM
Not something like these?

https://thecabe.com/forum/threads/schwinn-dx-i-think.104231/

[attachimg=1]
Title: Re: CB750K4 New project
Post by: Woodside on October 19, 2017, 06:33:10 PM
nope it was more bmx'y
i will look again later..
i used to ride it to frensham...its about 3 miles from home....
Title: Re: CB750K4 New project
Post by: Rob62 on October 19, 2017, 07:33:06 PM
Those american “muscle bikes” are real nice but quite expensive by the time you pay for shipping... I almost brought a schwinn stingray over from delaware a couple of years ago but it was gonna cost north of £800 so i settled for a uk bike instead.... a vindec same as the one i had as a lad

Some nice photos here
http://www.nemusclebikes.com/bicycles.php (http://www.nemusclebikes.com/bicycles.php)

My push irons
(https://s19.postimg.cc/ibho8vunn/20_E9_B0_C0-89_B1-4754-8_B7_D-_BF3_CCEC35001.jpg) (https://postimg.org/image/w560xxn8v/)

(https://s19.postimg.cc/io92f2kn7/94_F07886-_CBDE-42_A4-_B7_D4-4_BA3153_E9_E78.jpg) (https://postimg.org/image/xk7lmnw1r/)

(https://s19.postimg.cc/jdrurey1f/DCED8_C6_E-265_E-47_AF-937_A-3_D85_F6002053.jpg) (https://postimg.org/image/nznyzrjkf/)

(https://s19.postimg.cc/rj9wpk6ur/FB815256-_C160-43_AA-_B48_D-_CD760_F968_A48.jpg) (https://postimg.org/image/wuota9sxb/)

Looks like I’ve hijacked my own thread here... I’ll have to start another once i get fettling the 750


Title: Re: CB750K4 New project
Post by: AshimotoK0 on October 19, 2017, 07:50:10 PM
Missus had a Moulton once but gave it away

DS has this for sale at the mo'  :)


[attachimg=1][attachimg=2]
Title: Re: CB750K4 New project
Post by: Rob62 on October 19, 2017, 08:05:26 PM
Very cool..... i like the CBX behind it, i had a look at it when i was there... must be a contender for the ultimate classic jap bike... if only i had a big garage, and some more money  :-\
Title: Re: CB750K4 New project
Post by: Rob62 on December 31, 2017, 05:59:31 PM
Well, I finally started working on the 750 today.. xmas out of the way and decorating finished so no more excuses. Didn’t do a great deal, tank and seat off. Tank is in great condition just a few scratches here n there so will stay as it is. Seat is a brand new replica and tbh looks great, just missing the honda logo but i can stencil that on later if i feel the need. I want to change the usa bars for some lower uk style ones so off with those. Took me half an hour to get the wires out of the bars as the sheath had hardened, will replace it with heat shrink. Stripped off the headlight and separated the various wiring bundles. I’ll draw up a diagram later to make it easy for myself at rebuild time. One or two wiring mods in there, not too bad though. Everything came apart easily and looks to be in great condition. I lifted the rubbers off the carb tops for a look, one of the rubbers is split but the other three are ok, there is still yellow paint on top of the carb slider adjusters...!. Noticed another wasps nest between the rear frame and the plastic mudguard. Brought some parts inside for a clean up but thats all they will need i reckon, switches and master cylinder...  Hopefully will be a painless recommission...
(https://s19.postimg.cc/ceoqpyuw3/E0939_E41-9_A00-45_AE-8_E85-_AE787423_B60_F.jpg) (https://postimg.org/image/ew0hx8esf/)
(https://s19.postimg.cc/5bgvadkbn/86085127-1_E4_C-4167-8_DCC-0_C2_E1_CC2981_F.jpg) (https://postimg.cc/image/c1xcjt7hb/)
(https://s19.postimg.cc/ej93r2jo3/34_F0675_A-_B677-4_EBC-_AF36-_FC55_DC872_CBE.jpg) (https://postimg.cc/image/7ssmhmwi7/)

Title: Re: CB750K4 New project
Post by: Rob62 on January 05, 2018, 09:26:09 PM
Done a bit of cleaning in the week, headlamp is the original sealed beam, still works so cleaned it up, virtually zero rust on the rim, probably half a candle power but is original so will stay for the time being.
(https://s19.postimg.cc/t3cg3x4w3/4_C1_DD242-62_B3-4_F8_F-9973-86_D77274_E0_F7.jpg) (https://postimg.org/image/t3cg3x4vz/)
(https://s19.postimg.cc/cscc7lkoj/EEB7_A610-17_A6-4198-_BD4_E-_F22_C86_B162_C8.jpg) (https://postimg.org/image/gopo3l5nz/)
The switch gear cleaned up easiily, just needs re sleeving where the old stuff disintegrated.
(https://s19.postimg.cc/9lhsnysir/DAE3_ED0_E-90_F8-4_C96-8_FAB-6736909739_C9.jpg) (https://postimg.org/image/kxue5r17j/)
(https://s19.postimg.cc/6en94bsn7/D0_E7997_F-0400-4_C9_E-_B735-61_A71263908_D.jpg) (https://postimg.org/image/o4oxpd67z/)
The master cylinder needs a new diaphragm as the old one has hardened and shattered, the cap is like new, but worst of all the circlip is stubbornly rusted in despite a soaking with penetrating oil. Will have another go at it this weekend as I like the patina and really want to keep it on the bike.
(https://s19.postimg.cc/61vuy52nn/7_AA5_DD31-_CF71-42_EB-881_F-_A93_DA8_BBC35_D.jpg) (https://postimg.org/image/jisth0cz3/)
The mirrors are good except for some heavy pitting on the stems, but they look original so I will keep them for the time being.
(https://s19.postimg.cc/ou7q1qehf/E52_A6432-_A726-48_AF-8919-7_E1103_ECCD1_E.jpg) (https://postimg.org/image/tg3ua300f/)

Title: Re: CB750K4 New project
Post by: Rob62 on January 08, 2018, 10:43:15 PM
Stripped most of the bike down over the weekend, came apart quite well. Most of the stuff looks like it will be servicable. Carbs are in great nick, inlet rubbers have gone hard so will be replaced, exhausts ar inpretty good nick but will be replaced with a new 4 into 1. Engine needs removing for a check over and repaint.... overall no major concerns yet
(https://s19.postimg.cc/z3x9ymg4j/2352713_A-590_D-4_FED-_A9_AD-_B8_C295_A78_EB7.jpg) (https://postimg.org/image/6r1s85ue7/)
(https://s19.postimg.cc/s40ug9k2b/4_AAB0_FD1-6154-4_EBE-_B7_D3-9_EE552318_D81.jpg) (https://postimg.org/image/fcmo9raa7/)
(https://s19.postimg.cc/hfx3hra6r/760_F399_F-56_C4-4_CB7-_B0_A4-_F9259_D2314_FC.jpg) (https://postimg.org/image/o6dkr6xcf/)
(https://s19.postimg.cc/b3hy7e4eb/7_E436_DF0-5_E66-4_A99-92_F4-04863_A53352_B.jpg) (https://postimg.org/image/89esty27z/)
(https://s19.postimg.cc/oj4yxdnc3/D2449_FB3-973_B-4_C5_F-_B774-_EB12_F4_C94_E8_A.jpg) (https://postimg.org/image/hsohny067/)
(https://s19.postimg.cc/vmcud0fwz/32_BA29_C0-3_B00-43_FE-97_BD-_EF9823_D9_BBE6.jpg) (https://postimg.org/image/5qt3tte33/)
Managed to get the master cylinder circlip out too
(https://s19.postimg.cc/u7uk9i637/9_FA6_E5_BD-_D741-4_F4_D-_AC27-_D19_A74019_A3_A.jpg) (https://postimg.org/image/tv363bntb/)
Title: Re: CB750K4 New project
Post by: Trigger on January 08, 2018, 10:47:52 PM
Be careful with ordering a new master cylinder kit, a lot are listed but the wrong size. The two holes in the master cylinder need to be clear  ;)
Title: Re: CB750K4 New project
Post by: Rob62 on January 08, 2018, 10:51:25 PM
Tonight i had a look at the clocks, the lower chrome needs redoing and the upper could do with a repaint. So off with the crimp ring...
(https://s19.postimg.cc/ms5g5ihtf/B7_FAF0_F6-_ADF0-43_E4-8_E6_E-8963_A034_B4_F2.jpg) (https://postimg.org/image/523rkh48f/)
Cleaned the faces with a microfibre cloth and some vanish stain bar.... they are faded but cleaned up quite nicely, lenses cleaned up ok too, the difference is amazing. Will look great once back together.
(https://s19.postimg.cc/mfe1zek4z/7_E71_DBF6-_BF6_C-4221-_B33_E-4_A06_A2_A52858.jpg) (https://postimg.org/image/qois1kne7/)
(https://s19.postimg.cc/523rkhz3n/96306556-5_FB0-4374-8_FC4-_FA82_FCEFB23_D.jpg) (https://postimg.org/image/wpggylka7/)
(https://s19.postimg.cc/fc66jqh9f/CE4_C42_C2-_D381-49_E6-8_C83-_EA4258_AA2_AE1.jpg) (https://postimg.org/image/pyzzp5pen/)
Title: Re: CB750K4 New project
Post by: Rob62 on January 08, 2018, 10:56:59 PM
Be careful with ordering a new master cylinder kit, a lot are listed but the wrong size. The two holes in the master cylinder need to be clear  ;)
Cheers Trigger. Actually i already moticed that one of the two holes in the base of the reservoir looks to be blind drilled which seems a bit odd, the other goes straight through into the bore.... inside the cylinder is quite clean and rust free it was only the circlip groove that was rusted in. Ill get my magnifying glass out and have a closer look at those holes....
Title: Re: CB750K4 New project
Post by: Trigger on January 08, 2018, 10:58:46 PM
Looks a lot better than the one I was working on yesterday. Very hard to get the chrome cups re chromed, as the metal is thin and the shape is hard to polish for prep.

[attachimg=1]
Title: Re: CB750K4 New project
Post by: Trigger on January 08, 2018, 11:02:20 PM
Be careful with ordering a new master cylinder kit, a lot are listed but the wrong size. The two holes in the master cylinder need to be clear  ;)
Cheers Trigger. Actually i already moticed that one of the two holes in the base of the reservoir looks to be blind drilled which seems a bit odd, the other goes straight through into the bore.... inside the cylinder is quite clean and rust free it was only the circlip groove that was rusted in. Ill get my magnifying glass out and have a closer look at those holes....


You need a wire from a wire brush to poke in the hole that you think is blind, as it is not a blind hole  ;)
Title: Re: CB750K4 New project
Post by: Rob62 on January 08, 2018, 11:03:22 PM
Bloody hell that looks a bit bent !!. Yeah the metal is pretty thin, i notice there are new ones for sale at DS but i was hoping to use the old ones..... I’ll have a word with the plater and see what he says, they aren’t badly rusted but like you say may be too pitted to prepare.
Title: Re: CB750K4 New project
Post by: Rob62 on January 08, 2018, 11:05:20 PM
Be careful with ordering a new master cylinder kit, a lot are listed but the wrong size. The two holes in the master cylinder need to be clear  ;)
Cheers Trigger. Actually i already moticed that one of the two holes in the base of the reservoir looks to be blind drilled which seems a bit odd, the other goes straight through into the bore.... inside the cylinder is quite clean and rust free it was only the circlip groove that was rusted in. Ill get my magnifying glass out and have a closer look at those holes....



You need a wire from a wire brush to poke in the hole that you think is blind, as it is not a blind hole  ;)

Ahhh...nice one, I’ll have a look..thanks for that !
Title: Re: CB750K4 New project
Post by: Trigger on January 08, 2018, 11:19:20 PM
Did notice that your speedo has gained 5MPH  ;)
Title: Re: CB750K4 New project
Post by: Rob62 on January 09, 2018, 07:51:15 AM
Did notice that your speedo has gained 5MPH  ;)
:) thats just the camera angle, I havent removed either the needle or the faces..
Did have another look at that master cylinder this morning and i can see the little hole now that you pointed it out.... I’ll give it a gentle poke and a blow through with comp air.
Title: Re: CB750K4 New project
Post by: Rob62 on January 12, 2018, 09:05:23 PM
Stripped and cleaned the rear mudguard and light assembly tonight. No rechroming required although it does have some marking and slight pitting. It matches the rest of the bike....
(https://s19.postimg.cc/qviiykcer/325_CE910-9_F07-4_FEA-8546-7687_CF45_FCF9.jpg) (https://postimg.org/image/id92u85vz/)
(https://s19.postimg.cc/fvxbmye9v/43_A30445-5_BCA-4_DF3-8_A2_D-7_BA9_CF25_CF75.jpg) (https://postimg.org/image/5luwnpoe7/)
(https://s19.postimg.cc/836nuy5pv/B5_F76_D2_D-_A087-469_E-837_C-_D6807781_FE6_A.jpg) (https://postimg.org/image/6bdp01mcv/)
Received a few goodies through the post today too
(https://s19.postimg.cc/eh5e9g3ur/5E40E4C1-C2A8-4C43-B4BE-199819220FCB.jpg) (https://postimg.org/image/hnzxt2oan/)
May remove the engine tomorrow... see how much time i get...
Title: Re: CB750K4 New project
Post by: Rob62 on January 13, 2018, 06:18:09 PM
Well, towed my bollocks off today trying to extract that engine.... I thought I would try the suggested method of laying the frame on its side and lifting it off the motor.... Well i had to call the cavalry (my twin brother) in the end and after an hour of straining and cursing we finally managed to lift the bugger free, what a pain, will have to come up with a better technique when its time to refit.
(https://s19.postimg.cc/44ssliq5v/E5AB5548-74E1-4793-B43F-0805209AFEC7.jpg) (https://postimg.org/image/r69dr9ptb/)
(https://s19.postimg.cc/44sslhnkz/B6D2C668-75AA-4A4C-BC5B-0A87F16D08F9.jpg) (https://postimg.org/image/ud3xav7of/)
(https://s19.postimg.cc/cztmw0rsz/94627202-D2CB-4809-8825-59EDEC396609.jpg) (https://postimg.org/image/gw6ys0csf/)
Will do a bit of final stripping the stand off etc tomorrow, and the swing arm pivot appears to be well stuck...

These are free to a good home if anybody wants them, they work but aren’t perfect, be ok for a winter hack
(https://s19.postimg.cc/cn28puh8z/AB7DE588-D514-493D-A4B3-E2B85ABC4A53.jpg) (https://postimg.org/image/9sz3cef2n/)
Title: Re: CB750K4 New project
Post by: Green1 on January 13, 2018, 06:21:23 PM
You want a completely bare frame before lifting the wheels are bloody heavy.  ;)
Title: Re: CB750K4 New project
Post by: Trigger on January 13, 2018, 07:40:58 PM
Even with a bare frame, it is easier with two. And if your points cover is in good nick, always remove it and its contents  ;)
Title: Re: CB750K4 New project
Post by: Rob62 on January 13, 2018, 09:23:35 PM
We did remove the wheels and forks after we realised it wasn’t going to simply lift off, it took a lot of jiggling about, i guess you could get a knack for doing it after a few attempts but this was my first.... I put some blocks down and an old towel to protect the points cover which has no rust but is a bit bent.. it will straighten out. I think I will revert to the honda workshop manual method for refitting i.e. lift the engine into the frame....

My next worry is the swing arm spindle as it didn't want to come out easily..... but other than that the whole bike has come apart fairly easily and most of it will be good enough to go straight back on after a good clean.. Im getting excited  :P
Title: Re: CB750K4 New project
Post by: K2-K6 on January 13, 2018, 09:59:27 PM
It is a bit like the Krypton factor to juggle those out,  especially that bit by the rear engine mount by the kickstart area as it's just got to be in the right place to pass the frame lugs.

You get just a bit more wiggle room if you take the exhaust stubs off the head as well,  it just allows you to rotate it slightly more to get clearance at that back point. I don't feel they are too bad upright if you've got two of you on it,  usually rap thick newspaper round frame rails and stick with gaffer tape to protect painted frame and motor then gently lift it in and you can rest it while you look which way to juggle it as you inch it across to the right place.
Title: Re: CB750K4 New project
Post by: Rob62 on January 13, 2018, 10:09:16 PM
Yep that sounds like a good plan... and you’re right it was the rear mounting getting in the way.
Title: Re: CB750K4 New project
Post by: JamesH on January 13, 2018, 11:37:43 PM
Great advice re. Removing exhaust stubs. I learnt this one the hard way - but removal of the stubs makes life a lot easier...
Title: Re: CB750K4 New project
Post by: Rob62 on January 20, 2018, 10:00:40 PM
Finished cleaning the frame today. It was crusted in chain lube and dirt round the lower and inside tubes. My original intention was to keep the bike original and avoid powder-coat. There is no rot but a few areas that will need a bit of touching up. I think its just about good enough to keep original
(https://s19.postimg.cc/netf9b8nn/D22_C127_E-_D48_B-4_E0_A-8807-2515_C18_D9_D18.jpg) (https://postimg.org/image/cf87xpi8f/)
(https://s19.postimg.cc/ln0gefzlf/31E37CDC-894D-4697-B21B-728E949C08F2.jpg) (https://postimg.org/image/863hvkp9r/)
(https://s19.postimg.cc/5c0ci4fdv/DDAFEF73-8874-41FA-A3E0-F108E7949D56.jpg) (https://postimg.cc/image/61j4uhfxb/)
(https://s19.postimg.cc/7tc3pdjur/248505C8-FE4E-4328-8516-B7DE30E74A78.jpg) (https://postimg.cc/image/hdvqc996n/)
The swing arm will need powder coating, or re painting.... unfortunately there are too many scratches. Shame because i like the original decals. I notice that there are some for sale on ebay at reasonable prices but the one for the swing arm isnt 100% accurate ...
https://www.ebay.co.uk/itm/HONDA-CB750-FOUR-K3-K4-1973-1974-WARNING-KIT-DECALS/202163352220?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649
Title: Re: CB750K4 New project
Post by: Trigger on January 20, 2018, 10:15:56 PM
Piki is a member on this forum, send him a PM and he will do you a SOHC members deal. If you send him a detailed picture of the decals, then he will do his best to copy it  ;)
Title: Re: CB750K4 New project
Post by: Woodside on January 21, 2018, 08:56:47 AM
that ebay link is to piki's...but pm direct he is very very helpfull and his stickers are tops...
Title: Re: CB750K4 New project
Post by: Rob62 on January 21, 2018, 09:47:31 AM
Thanks for that, the stickers look great but the swing arm one has different wording. Im not normally fussed about minor details but as I have the original decal it may as well be copied exactly... I’ll take a photo.
Title: Re: CB750K4 New project
Post by: Woodside on January 21, 2018, 10:33:12 AM
take a photo send it to piki he will copy it...he helped me with some fantic decals ...and they turned out perfect
Title: Re: CB750K4 New project
Post by: Nurse Julie on January 21, 2018, 10:48:10 AM
Piki (Diego) is brilliant. Very accommodating and does an excellent job. There are not many weeks go by that I'm not asking him for some decal or another for these old Honda's.
Title: Re: CB750K4 New project
Post by: MrDavo on January 21, 2018, 11:21:21 AM
The swinging arm sticker I bought from eBay was a genuine Honda one in a Honda bag. The seller was a monkey bike specialist, can’t remember the name, but it was the same part number.
Title: Re: CB750K4 New project
Post by: MCTID on January 21, 2018, 03:09:21 PM
I am also happy to recommend Piki.......he supplied the CB750 Decals for mine and they are splendid.
Title: Re: CB750K4 New project
Post by: Piki on January 21, 2018, 03:09:31 PM
Hello there, thank you for the support! If you need decals buy from me directly, I will give you better price  ;D
Title: Re: CB750K4 New project
Post by: Rob62 on January 21, 2018, 07:11:44 PM
Cheers piki... pm sent
Title: Re: CB750K4 New project
Post by: Rob62 on March 17, 2018, 09:08:32 AM
Jesus...... getting pissed off with all this “global warmimg”... can’t do any frame painting in this cold and damp.....when’s it going to end...... grrrr
Title: Re: CB750K4 New project
Post by: Rob62 on March 28, 2018, 09:35:08 PM
Took a few ancillaries down to my local powder coating shop on Monday (LSN Castleford). The frame will be touched up and kept as original as possible but these parts would take a load of cleaning, prepping and painting and i dont really have the facilities or the patience.
(https://s19.postimg.cc/3ksffi2xv/0_F89_E4_AB-0_DA9-4_EA4-_AE4_B-74_FF41_BF948_E.jpg) (https://postimg.org/image/3ksffi2xr/)

Collected them today
(https://s19.postimg.cc/oug1q9qxf/F563_DF32-9_AA2-4691-919_D-5_AD309_C7_F89_D.jpg) (https://postimg.org/image/q9hmezs0f/)
The finish is great, and durable too as this will be a rider and will get wet from time to time....
(https://s19.postimg.cc/roj73lb2b/CD2_C1149-603_D-4522-_B0_BC-_B1_B547_C12440.jpg) (https://postimg.org/image/roj73lb27/)
Title: Re: CB750K4 New project
Post by: Rob62 on April 16, 2018, 10:20:19 PM
Managed to get a bit of time on the bike this weekend. Spent a few hours degreasing the engine, a messy job when its got 44 years of grime on it.. anyway its looking a lot cleaner now.. Thought i better have a quick look inside befor I paint it. To be honest I hoped and expected it to be ok, looks pretty good in there to me. It did run when i bought it but i had no idea what state it was in. I’ll get my fibre optic camera in it when i get chance but quite happy at the moment. Hopefully it’ll be ready for paint next weekend.
(https://s19.postimg.cc/szyy3lfgj/130_AB0_BC-8_E26-4_B6_D-_B299-_F01621996_B2_C.jpg) (https://postimg.cc/image/4jgs94epr/)
(https://s19.postimg.cc/yo58uhz8j/70_BC8198-31_D8-47_E5-_A585-0_A5_EA9193248.jpg) (https://postimg.cc/image/ipwj4d50f/)
(https://s19.postimg.cc/i0dqrzwr7/75395508-62_EB-4367-8_D90-11_BAEB220_A4_B.jpg) (https://postimg.cc/image/4jgs94mfj/)
(https://s19.postimg.cc/vhapavmib/F97_C1245-0823-46_D0-8003-_FABEE84560_DB.jpg) (https://postimg.cc/image/rxorl2jsf/)picture uploader (https://postimages.org/)

Title: Re: CB750K4 New project
Post by: Trigger on April 16, 2018, 10:43:13 PM
Looks good in the rocker box, I would be temped to clean the main oil gallery and remove the cam and towers, to check the oil jets are clear. While the jets are out blow out with air line  ;)
Title: Re: CB750K4 New project
Post by: Rob62 on April 17, 2018, 09:19:34 PM
Sounds like good advice, cheers Trigger
Title: Re: CB750K4 New project
Post by: Rob62 on April 22, 2018, 06:12:01 PM
A bit more progress this weekend. Rubbed down, Touched up and re lacquered the frame
(https://s19.postimg.cc/inwggsdvn/08_B0_B36_E-9_AFE-4_F46-80_A0-_A780_FF0617_F2.jpg) (https://postimg.cc/image/6ysgstmwv/)
(https://s19.postimg.cc/upruaxutv/13E647B2-4224-4823-AAE3-13ACDDA6BA86.jpg) (https://postimg.cc/image/v2j8h4d3j/)
(https://s19.postimg.cc/6ysgsuhs3/53C44D1C-43DE-4D53-9D1D-0D75CCD2A88B.jpg) (https://postimg.cc/image/5jqw44gov/)
(https://s19.postimg.cc/q3vq2loqb/904366ED-00B7-4BE6-8DF2-3EB52C8FFE11.jpg) (https://postimg.cc/image/4hgplkq5r/)
(https://s19.postimg.cc/6ysgstf77/A77AD4F4-9655-41D4-8F4E-A6426B44E217.jpg) (https://postimg.cc/image/oc2r7oai7/)
(https://s19.postimg.cc/7ob9572w3/EA091_AF6-49_F6-4256-8246-_AFEDFC1_F6_D9_D.jpg) (https://postimg.cc/image/lhzlu8vhb/)
Cleaned up and re-finished the rocker cover too.
(https://s19.postimg.cc/xwmdulhur/25DB6ED1-6746-44E2-A256-ED286301CC4A.jpg) (https://postimg.cc/image/upruayxen/)
(https://s19.postimg.cc/l587o30cz/62A12792-A99F-4435-BF99-E3AAA5944E08.jpg) (https://postimg.cc/image/taq9m8olr/)
Next its engine check, paint and refit to frame
Title: Re: CB750K4 New project
Post by: JamesH on April 22, 2018, 08:01:20 PM
Beautiful finish on that frame Rob. Nice work.
Title: Re: CB750K4 New project
Post by: Rob62 on April 23, 2018, 12:04:20 AM
Thanks James, i dont think it will be up to the same standard as one of your stunners, but it will be tidy enough i hope
Title: Re: CB750K4 New project
Post by: Rob62 on May 06, 2018, 09:50:58 PM
Managed to get some paint onto the engine yesterday..... its not perfect but will have to do.... looks very silvery and hopefully will dull off a little once its been cured and used a bit... stuck the cases on just to see the overall effect
(https://s19.postimg.cc/jk6egiwrn/156EA06B-C2EC-46C0-AD77-130B2B232B7F.jpg) (https://postimg.cc/image/eyaa86b8f/)
(https://s19.postimg.cc/eliw200oj/320D3371-C089-4929-BDF3-7A7AD4CCC68F.jpg) (https://postimg.cc/image/kmgkz2nan/)
(https://s19.postimg.cc/ihw7xyyir/9F358C1D-EA0C-45F9-87CF-366094F8DE99.jpg) (https://postimg.cc/image/u707lxphb/)
(https://s19.postimg.cc/j7f0ac6s3/D0FC561E-5A0D-4C5C-9E4B-1526B109989B.jpg) (https://postimg.cc/image/fb1oeclsf/)
Title: Re: CB750K4 New project
Post by: Rob62 on May 09, 2018, 07:22:31 PM
A couple of weeks ago i contacted Sean of Agbrigg chrome....i have a few parts that need sorting... I was thinking that the winter restorations might be slowing down a bit and he may be able to get my stuff done pretty quickly. Unfortunately the forecast was between 5 and 10 weeks depending on the amount i have... So i decided to contact the local plater Castleford Chrome to see if he was also busy. Sadly I discovered that they were closed down, the poor chap had ended his own life, very sad. So I then decided to try Allenchrome, widely promoted on here.... unfortunately they have a 16 to 20 week turnaround!... So, last Thursday i dropped my stuff off with Sean, he looked at it and told me 2 weeks, I was more than happy with that.. This morning, less than a week later, i get a text from Sean “your bits are ready”.... Sean managed to turn it round in record time. Here it is, very happy, I can def recommend Agbrigg Chrome!
(https://s19.postimg.cc/5ixmmij6r/B2DA44A4-192B-438C-A10E-31272BAFE7FA.jpg) (https://postimg.cc/image/wtixufm3j/)
(https://s19.postimg.cc/vr8rbvvkj/646846C2-2EB5-4E8C-96FF-39CFC931526F.jpg) (https://postimg.cc/image/aucj77xjj/)
(https://s19.postimg.cc/g5rfrxz1v/5F356F95-3D6E-4232-9B98-22E6C03DC4F3.jpg) (https://postimg.cc/image/k24rnxk1b/)
Title: Re: CB750K4 New project
Post by: JamesH on May 10, 2018, 12:29:44 AM
Looks like he’s done a lovely job there Rob. Those exhaust clamps are usually a nightmare. Good job.
Title: Re: CB750K4 New project
Post by: Arch stanton on May 10, 2018, 06:31:08 AM
You had a lucky escape.
I once used Castleford Chrome. After the mess they made of my stuff. Then tried to rectify the mess by making more mess.
I felt like doing myself in!
Your project is looking good.
Sean.
Title: Re: CB750K4 New project
Post by: Spitfire on May 10, 2018, 10:12:55 AM
They look great, nothing beats getting nice shiny bits back from the platers.

Cheers

Dennis
Title: Re: CB750K4 New project
Post by: Rob62 on May 10, 2018, 10:32:06 PM
Thanks chaps.....hopefully i will be starting to put it all back together soon.... :o
Title: Re: CB750K4 New project
Post by: Rob62 on May 15, 2018, 09:53:25 PM
Moving in the right direction at last...... still plenty to do though
(https://s19.postimg.cc/yz8oyk4wj/B6E584DC-322E-47BD-9D2C-51A29765190E.jpg) (https://postimg.cc/image/451g0tz9r/)
Title: Re: CB750K4 New project
Post by: 71 V12 on May 16, 2018, 10:51:48 PM
Hi Rob,

You are doing beautiful job there, great see the progress.

Out of interest what method did you use to get the engine back in the frame? I have this to do soon and rather apprehensive of the job.

Cheers

Kevin
Title: Re: CB750K4 New project
Post by: Laverda Dave on May 17, 2018, 07:44:28 AM
Lovely chroming there, always nice to get some bling back and the encouragement it brings to crack on with the restoration. Engine looks good in the frame, just the indicators, petrol tank and seat to fit and it's finished  :).
Keep the photos coming.
Title: Re: CB750K4 New project
Post by: Rob62 on May 17, 2018, 01:27:43 PM
Hi Rob,

You are doing beautiful job there, great see the progress.

Out of interest what method did you use to get the engine back in the frame? I have this to do soon and rather apprehensive of the job.

Cheers

Kevin


Thanks  :) !

regarding fitting the engine, I placed the engine on the floor (still in the engine frame as supplied by Nurse Julie) carefully laid it over onto the right side and propped with blocks of wood covered in an old towel. Be careful to avoid damaging the points cover or shaft if  the cover is already removed... Then with the rocker breather cover removed carefully lower the frame onto the engine and fit the two bottom mounting spindles. I had the exhaust stubs removed also, but the sump was fitted... Its a 2-man job to ensure you don't damage the paint on the frame.. I also wrapped the frame tubes with old magazines to protect them.. Its then a 2-man job to lift the frame back upright and onto the stand.... that engine is a heavy lump..


Title: Re: CB750K4 New project
Post by: Moorey on May 17, 2018, 02:10:50 PM
Did you cure the paint on the engine Rob, if so how. ?
Title: Re: CB750K4 New project
Post by: 71 V12 on May 17, 2018, 09:52:28 PM
Hi Rob,

You are doing beautiful job there, great see the progress.

Out of interest what method did you use to get the engine back in the frame? I have this to do soon and rather apprehensive of the job.

Cheers

Kevin


Thanks  :) !

regarding fitting the engine, I placed the engine on the floor (still in the engine frame as supplied by Nurse Julie) carefully laid it over onto the right side and propped with blocks of wood covered in an old towel. Be careful to avoid damaging the points cover or shaft if  the cover is already removed... Then with the rocker breather cover removed carefully lower the frame onto the engine and fit the two bottom mounting spindles. I had the exhaust stubs removed also, but the sump was fitted... Its a 2-man job to ensure you don't damage the paint on the frame.. I also wrapped the frame tubes with old magazines to protect them.. Its then a 2-man job to lift the frame back upright and onto the stand.... that engine is a heavy lump..

Thanks Rob, good to know. Seems to be the favoured method.
Title: Re: CB750K4 New project
Post by: Rob62 on May 17, 2018, 09:57:47 PM
Did you cure the paint on the engine Rob, if so how. ?

No I havent run the engine yet Moorey.. im hoping it will be ok when I get round to it. The paint leaves a silvery mark on your fingers at the moment, I was careful not to touch it when fitting the frame... It does say on the tin thats its ideal for engine blocks and the best way to cure it is by running the engine..... we will see.
Title: Re: CB750K4 New project
Post by: Rob62 on May 17, 2018, 10:15:21 PM
A few more shiny bits arrived today.... Hopefully thats just about the end of the spending except for a new pair of tyres.
(https://s19.postimg.cc/avnxxwnrn/EB3CDD88-C639-430A-8417-3EE92717099E.jpg) (https://postimg.cc/image/dpr3bcpxr/)
(https://s19.postimg.cc/9tdrfdztf/AB322538-ED62-44F4-9725-FBE0FAD6BB1C.jpg) (https://postimg.cc/image/8r3kwugzz/)
(https://s19.postimg.cc/bl6qaabgj/89DDAB6D-6E0C-49B0-BE18-89EE0D2BA67C.jpg) (https://postimg.cc/image/slpmiyohr/)(https://s19.postimg.cc/hyvtdk3hv/7E59299B-3FBF-4B76-88B9-9893586EC8EB.jpg) (https://postimg.cc/image/6zam1yd2n/)
(https://s19.postimg.cc/nztiamieb/39188777-209_B-440_D-919_C-16194_BF283_C0.jpg) (https://postimg.cc/image/wi2yeyowv/)
Made a bit more progress assembly wise too..... starting to realise I didn’t take enough photo’s, but its coming together slowly..
(https://s19.postimg.cc/3sg2i9v6r/A50FE89F-894C-431A-98F5-1A79FECB1886.jpg) (https://postimg.cc/image/tb8evaeqn/)
Title: Re: CB750K4 New project
Post by: Rob62 on May 26, 2018, 08:21:52 PM
Chuffing hell..... it takes a lot longer to put it back together than it did to take it apart... another long day... :o
(https://s19.postimg.cc/5z7yai5lf/4_B974178-_A737-4_FCB-97_D8-430_C0447558_D.jpg) (https://postimg.cc/image/8gjphrphr/)

(https://s19.postimg.cc/fwiz3jxrn/7618_DE3_F-56_B0-4765-_A92_D-_FAA1125_DA28_C.jpg) (https://postimg.cc/image/bamuv7c8f/)

(https://s19.postimg.cc/a8coco14z/89_B4_BBFB-79_E7-4100-98_F2-4_EA75034_F883.jpg) (https://postimg.cc/image/962hu4ibj/)


Title: Re: CB750K4 New project
Post by: K2-K6 on May 26, 2018, 08:52:34 PM
Looks good and coming along nicely though.

All that time spent will seem very worthwhile when you get out to ride it I think. It's great to see these stories of this era bike coming back into use.

Very good thread.
Title: Re: CB750K4 New project
Post by: Rob62 on May 26, 2018, 09:17:53 PM
Looks good and coming along nicely though.

All that time spent will seem very worthwhile when you get out to ride it I think. It's great to see these stories of this era bike coming back into use.

Very good thread.

Thanks  :)
Title: Re: CB750K4 New project
Post by: Rob62 on May 29, 2018, 10:47:22 PM
Had another couple of hours on the build tonight. Tonight’s job was fitting and setting new points and condensers (I may go for electronic ignition if they prove to be troublesome.....but will give them a try first). The original points didn’t look too bad but I bought some new ones anyway. So after setting the gap i got out the multimeter so that I could set the timing with the buzzer.... well bugger me I couldn’t get any continuity from the new points, as if they weren’t closing properly. I had to take them back off and still couldn’t get any continuity across the anvils. Turned out they had some kind of protective lacquer or something on the faces.. I had to rub it off with fine wet n dry, don’t ever remember having to do that before. Anyway they are on now and it wont be long before I’m ready to try starting her up  :o
Title: Re: CB750K4 New project
Post by: Andych on May 30, 2018, 06:01:25 AM
Old mechanics trick was to drop the new points into a small tin of petrol while you pulled the old ones out.. Then dried them off and installed them. The petrol dissolved the coating and never had any troubles.
No one does it these days as it has been so long since anyone changed points on a car etc.. I still have a dwell meter around somewhere as well as my home made test lamp for Static timing setting..  Ahhh the good old days :)
Title: Re: CB750K4 New project
Post by: adespin on May 30, 2018, 01:39:19 PM
Hi Rob, very nice job you are doing considering it was only going to be a "tidy up" and not a full resto'. Could you tell me what the new exhaust system is as i need to change my shot 4 into 2 system on my imported K1.
Title: Re: CB750K4 New project
Post by: Rob62 on May 30, 2018, 09:06:01 PM
Hi there adespin, thanks for the comments... yes i do seem to have done a bit more restoring than I originally intended. But much of the bike has only been cleaned, most of the chrome, mudguards, wheels, lights are all original, tank and sidepanels untouched although I will touch up some missing paint on the sidepanels. The exhaust is a Delkevik made in the UK by D&K in Stoke, they do seemto be popular and a very competitive price to say they are stainless steel. I haven’t fitted mine yet so I can’t comment on the fit but it sure looks good out of the box.... mine is the short pipe version
http://www.delkevic.co.uk/index.php?route=product/product&path=1_1082_1789_1790_1795&product_id=57990 (http://www.delkevic.co.uk/index.php?route=product/product&path=1_1082_1789_1790_1795&product_id=57990)
Title: Re: CB750K4 New project
Post by: Rob62 on June 02, 2018, 05:49:15 PM
Couldn’t resist chucking the tank on to see how she looks.... ::)
(https://s19.postimg.cc/fnc99n0oz/02_DDFC05-_F7_BE-43_EA-_AEC3-_F851_FF5_F85_D4.jpg) (https://postimg.cc/image/5d9uaeatb/)

(https://s19.postimg.cc/z56wpkpwz/2_B732262-_B15_F-45_AA-8562-_A0704_E654_D23.jpg) (https://postimg.cc/image/6sbez446n/)

(https://s19.postimg.cc/6sbez3wgz/6_F5_F4_A57-3_BB2-4_F5_A-943_B-_D7_BCED323691.jpg) (https://postimg.cc/image/cghpq00tb/)

Still need to clay bar and polish the tank but the paint is decent....also need to do a bit of local touch up and then re lacquer the sidepanels.... Then its time to see if she will start...
Title: Re: CB750K4 New project
Post by: Green1 on June 02, 2018, 06:21:34 PM
looking good I do like the oddball coloured ones
Title: Re: CB750K4 New project
Post by: Rob62 on June 02, 2018, 06:26:31 PM
Oddball  ;D .... it was one of only three colours for that year’s model, Boss Maroon. Probably wouldn’t have been my first choice but its growing on me  :o
Title: Re: CB750K4 New project
Post by: Green1 on June 02, 2018, 06:38:46 PM
I must be a bit odd because I like the poo brown ones.
I once stopped in a petrol station and an old boy came up to me and said nice bike but why did you paint it in the wrong colour. He was adamant they were only made in blue or gold. 
Title: Re: CB750K4 New project
Post by: Rob62 on June 02, 2018, 07:12:36 PM
Its aliiiieeeeeeeeeeeve......!! ;D
(https://s19.postimg.cc/cycv693df/8_F4_B5_DBB-8_A08-4131-9_FD3-_AAA83_E20_D730.jpg) (https://postimg.cc/image/edefuz4gf/)
Title: Re: CB750K4 New project
Post by: SteveD CB500K0 on June 02, 2018, 07:23:35 PM
I think we’ve all had one of those moments


Sent from my iPhone using Tapatalk
Title: Re: CB750K4 New project
Post by: Nurse Julie on June 02, 2018, 08:13:52 PM
Oooooooooooh, how exciting. Having been through it twice with two bikes very recently, I can remember the feeling well. Just wait till you fire her up, even more exciting  ;D
Title: Re: CB750K4 New project
Post by: mike the bike on June 02, 2018, 08:19:29 PM
+1 on that.  There's nothing like the sound of a dead engine coming back to life.
Title: Re: CB750K4 New project
Post by: Rob62 on June 16, 2018, 05:47:03 PM
Had a frustrating couple of days in the garage since returning from holiday on Thursday... Routing and re-routing cables to finally get them something like... But mainly with the elctrics. All of the components are back on the machine except for the speedo and tacho (2 wires each so should be simple enough). All the plugs around the battery box are straight forward and basically impossible to get wrong although there is a green and a red spade connector which appear to be redundant (not connected when I bought the machine)... top right of photo.
(https://s19.postimg.cc/goct1bww3/6_A99_FA23-9_ECC-4430-_AC57-16_A69_BA695_F3.jpg) (https://postimg.cc/image/goct1bwvz/)
On paper connecting all the wires in the headlight bowl should be easy enough as they are all colour coded. However once connected i have a working tail light, the starter button doesn’t do anything, the oil pressure light was on but now off, the neutral light works ok. The indicators were missing so i now have some new stanley indicators with non std color coded wires which could be part of the issue. Once i connect them the left indicator comes on but doesn’t flash the right doesn’t come on but the flasher unit clicks and then when i turn the light switch on the left indicator comes on and the fuse blows!.... I’m not asking anybody for a full diagnosis here but if i could get a little info to help me work out how it should all work that would be great. For example the indicator circuit has green wires, blue wires, orange wires, orange/white wires and blue/white wires. If i knew what all the colours were i.e. live, earth etc it would help me to try and work my way through the wiring diagram. There are also lots of black wires with multi connectors, are these earths or live?. One final question, the front indicators have three wires each, two coming through the stem and a green earth? On the nut inside the headlight bowl. The rear indicators also have two wires coming through the stem but no green earths, but there are places for earths on the bracket where the rubber mounting fits..these aren’t shown on the wiring diagram? Any help greatly appreciated. PS the photo is before the strip down i.e. how it arrived to me.
Title: Re: CB750K4 New project
Post by: Rob62 on June 16, 2018, 05:57:21 PM
Just found this which may help....migt be useful to other non-electricians too
http://vsource.org/VFR-RVF_files/HondaWireColors.htm (http://vsource.org/VFR-RVF_files/HondaWireColors.htm)
Title: Re: CB750K4 New project
Post by: BigAl (Alan) on June 16, 2018, 06:25:24 PM
Not sure which diagram your using? but the latest Clymer manual with colour coded wiring takes a lot of work out of the fault finding job.
I have attached an image of your spare RED spade connector, it has no function on the K4 bike

Alan
Title: Re: CB750K4 New project
Post by: Rob62 on June 16, 2018, 06:30:37 PM
Bloody hell! Just been studying the wiring diagram and noticed that the fuse box shows three different rated fuses, 7amp, 15amp and 5amp. However the haynes manual describes the fuse box as; “containing 2 spare 15amp fuses and the 15amp fuse necessary to protect the equipment” I read this earlier and assumed that only one position in the fuse box was live (the bottom position) and the other two above it were for spare fuses... but the usa k4 diagram says otherwise? Any help greatly received.
Title: Re: CB750K4 New project
Post by: Rob62 on June 16, 2018, 06:35:16 PM
Thanks Al, thats looks like a different (better) diagram to the one I have, found on the internet....
Title: Re: CB750K4 New project
Post by: Rob62 on June 17, 2018, 06:48:26 PM
So, inbetween visits from my kids i spent another couple of hours in the garage. Last night i did a bit of research on the wiring and found a few alternative wiring diagrams for the usa models....there seems to be a few versions out there which adds to the uncertainty....however. I now have working correctly; tail light, brake light, neutral light, oil light, headlamp, high beam, indicator buzzer, indicator relay but still the indicators do not work. They are new pattern items with two wires from each stem, i have them connected to light blue and green RH and orange and green LH, front and rear. The green earths on the healdlamp bowl are currently disconnected?...I believe the original indicators would have had a single wire through the stem (for the light blue and orange) and utilize the earths in the headlamp bowl?  I’ll persevere and get there in the end..
Title: Re: CB750K4 New project
Post by: Rob62 on July 01, 2018, 12:56:41 AM
Another sunny summer day spent in the garage..... getting a bit cheesed off spending all my spare time working on the bike, still its gotta be done.
Fitted the exhaust today, bit of a struggle but ok in the end. Still need to finish off a few bits, fit the chain, rear brake linkage, bleed the front brakes, fit the clocks, sort out the annoying leaky oil tube and one of the carb float bowls has a slight leak......  but she runs !! and sounds ok, no burning oil or nasty rattles (just normal sohc noises). Needs the carbs balancing but started up 2nd kick. Ended the day on a high.

(https://s19.postimg.cc/smzdw2tib/47_EC65_D8-9_BC0-46_F5-8_E24-7373_B28_E1_DEE.jpg) (https://postimg.cc/image/i05kqnlcv/)
(https://s19.postimg.cc/awxpb187n/563062_F3-_C037-41_C3-886_D-_AAB73_B2_A1412.jpg) (https://postimg.cc/image/e3s8unsnj/)
(https://s19.postimg.cc/myt356wvn/8_D301086-_BEC3-494_E-977_F-3319_AB74_DF5_A.jpg) (https://postimg.cc/image/70kdf22nj/)

https://m.youtube.com/watch?v=e0POPnciudA
Title: Re: CB750K4 New project
Post by: Spitfire on July 01, 2018, 11:06:22 AM
Looking good, no scratch that looking great, I'd stop and admire it if I saw it parked up.

Cheers

Dennis
Title: Re: CB750K4 New project
Post by: JamesH on July 01, 2018, 11:39:11 AM
Great work Rob, looking really good.
Title: Re: CB750K4 New project
Post by: Rob62 on July 01, 2018, 11:52:22 AM
Thanks chaps, i’m quite happy... although it certainly is nowhere near one of your top restos’s James.. The handlebars, mirrors, mudguards, headlamp brackets, wheels, lights are all original chrome and pitted but in keeping with the age. The tank is scratched here and there but again in keeping. So its a mixture of original patina and diy restoration. Still cost a few bob though 😳
Title: Re: CB750K4 New project
Post by: hairygit on July 01, 2018, 12:31:15 PM
You may not think it's up to James' standard of restoration, but you have a good looking bike to enjoy the summer with. (That said, it's pi%*ing down here in Devon right now)
Title: Re: CB750K4 New project
Post by: Rob62 on July 01, 2018, 02:55:12 PM
Cheers HG, its baking hot here and has been for weeks now, once she’s mot’d it’ll start raining no doubt
Title: Re: CB750K4 New project
Post by: JamesH on July 01, 2018, 10:28:42 PM
You may not think it's up to James' standard of restoration, but you have a good looking bike to enjoy the summer with. (That said, it's pi%*ing down here in Devon right now)
It’s all relative and Hairy’s exactly right - at the end of the day you saved another 750 and have a superb bike to enjoy the summer on. Enjoy and be proud of your work. It’s bloody hard work restoring these 750’s...but very rewarding..
Title: Re: CB750K4 New project
Post by: Green1 on July 01, 2018, 10:52:26 PM
Looks great.
Nothing wrong with a few scratches it shows its been used and enjoyed.
My bikes had enough people around them today so I'm sure yours would.
Title: Re: CB750K4 New project
Post by: Rob62 on July 22, 2018, 04:32:21 PM
Another frustrating day with no progress..... :( My original target for having this bike completed was the mallory festival on the 7th july, however despite having the bike built and running by the evening of the 5th, she developed a misfire which turned out to be the ht leads melting. I’ve never seen this before but as they are 45 years old i decided to draw a line under the problem and order some new ones. I took the NSR to mallory and then had a week in henly on thames sampling the local beer.... So today i set about replacing the old coils. They are from wemoto, i have used wemoto coils on other projects with no problems.. The first thing is to attach the correct connections onto the low tension wires. Assumption #1 that the black lead will be the power lead (b and w) and the yellow lead will be the points lead (yellow or blue)... both new coils had one yellow lead and one black lead with spade connectors... So when i make all the connections and then switch on the ignition and turn on the run switch she immediately blows the main fuse. I have double checked that the new connectors are on correctly i.e. black to black/white on each coil and yellow to yellow on one, yellow to blue on the other. Any ideas what would cause the fuse to blow? Would having the power wires (b/w) mixed up with the point wires (yellow or blue) cause a short?.... i need an auto electrician.. any help greatfully received... running out of fuses.
Title: Re: CB750K4 New project
Post by: K2-K6 on July 22, 2018, 05:02:28 PM
Not sure if it'll cause a dead short but at least protected by the fuse.

The points wires run straight to earth via the points back plate with the points closed. It's a bit reverse logic as you are switching the earth line when you'd normally, in a conventional circuit,  expect to be turning the power line on and off.

So the setup is,  positive to the coils via ignition circuit,  earth's switched by points.

Hopefully someone can shed some light on the wemoto wire colouring for you. But you've only got one other configuration you can go with, maybe switch over connection and try with new fuse.
Title: Re: CB750K4 New project
Post by: Rob62 on July 22, 2018, 05:25:43 PM
Thanks K2.. i wanted to see if anybody could shed some light before i tried the other way round as i dont want to cause damage but i think its the only other option.... The other doubt thats now creeping into my mind is the big square metal mounts on the coils which are earths right?, since they are mounted to the frame they must be?... its just that none of the diagrams I’ve looked at show any earths on the coils and when i connect all the wires up with the coils just sitting there not screwed down onto the frame bracket, the fuse doesn’t blow....

What a frustrating day, and to cap it all off i managed to stand up next to the bike, hook the clutch lever around my brand new foooking expensive varifocals and knock them lense down onto the floor and scratch the lenses..... grrrrrr
Title: Re: CB750K4 New project
Post by: K2-K6 on July 22, 2018, 05:59:41 PM
As I understand it the main, structural, earth on the coils is the neg side of the High Tension circuit that completes the spark circuit. 

The low tension, low voltage side of the coil is effectively separate and just connected via the wires you describe through both the supply positive and negative switching by the points.
Title: Re: CB750K4 New project
Post by: Rob62 on July 22, 2018, 09:03:50 PM
Ok...the solution. First off as many of you no doubt already know, the big iron mounting bars on the coils are not earths, according to all the diagrams they dont seem to form any part of the circuit? You were right K2, the earth for the ht side is the cyl head.

The clue was in the fact that the fuse only blew when the coils were clamped down, when they were free standing i could connect up all the wires without any problem. These replacement coils have spade connectors coming from the moulded body. On the left side coil (1 & 4) the spade connector gets slightly pressed up against the frame mounting when the coil is tightened up, but its got a protective plastic sheith so should be ok, but this one had a tiny split and was shorting out. 2nd problem was that the polarity of the wires was wrong, i wrongly assumed that the black wire was the positive feed but in fact it was the other way round. There is a crude + and - moulding in the coils thats not so easy to spot unless you have a good look.... I’m not sure that would have caused a problem anyway, i think it might have run but its the right way round now.

So after much frustration she now starts and runs on all four again... next job carb balancing. I’ve bitten the bullet and bought a set of £107 sealey gauges which i hope will work ok.
Title: Re: CB750K4 New project
Post by: Rob62 on July 24, 2018, 10:30:28 PM
Had a quick go at balancing the carbs yesterday.... was getting late so packed it in but was struggling to get her running evenly. Ended the day worrying that there may be a problem with the motor ie compression. So tonight i double checked all the valve clearances, which were ok, then I ran a compression test. Cold engine, left 3 plugs in the motor, throttle wide open, 5 seconds on the strater motor, 150 psi on each cylinder, so I was happy with that. Again it was getting late so i made some adjustments to the carbs and just fired her up for a few seconds, seemd to be running better but still not too smooth..  Will balance the carbs at the weekend and then i reckon she just needs a good run. Im going to send off my registration application tomorrow so i took a couple of photographs of her to support the application. She is now virtually complete, just needs the side panels lacquering and a few decals adding. Hopefully I’ll be riding her in a couple of weeks 😄

(https://s19.postimg.cc/wojs4j0tf/7_A85_DE7_F-13_B1-4338-_BC5_F-6_B00_C6_E946_CC.jpg) (https://postimg.cc/image/qaup19vxb/)

(https://s19.postimg.cc/m1pyz40dv/CD50_CC1_E-_FF6_D-4587-971_F-5_D4265191720.jpg) (https://postimg.cc/image/bew5tos8f/)

Title: Re: CB750K4 New project
Post by: Rob62 on August 03, 2018, 07:32:23 PM
Mine is all done now... just waiting for a reg number. I think its the first resto that i have actually completed before i started riding it. Usually i am finishing off loose ends weeks after first riding them.  Will have a few snags to fix after the first shakedown no doubt, cant wait
(https://s19.postimg.cc/ah03r7o43/C74363_DF-83_AC-4_F29-_A821-_E33_A462_DA995.jpg) (https://postimg.cc/image/iz9jvjumn/)
Title: Re: CB750K4 New project
Post by: Green1 on August 03, 2018, 08:25:34 PM
Looks great you've got a really good shine on that oddball colour  8)
Title: Re: CB750K4 New project
Post by: Rob62 on August 03, 2018, 08:32:48 PM
Haha cheers.... they always say you can’t polish a turd.... but you can roll it in glitter
Title: Re: CB750K4 New project
Post by: Green1 on August 03, 2018, 08:43:10 PM
Mine starts off as glitter
Title: Re: CB750K4 New project
Post by: JamesH on August 04, 2018, 10:36:51 AM
Looks superb, well done Rob.
Title: Re: CB750K4 New project
Post by: adespin on August 04, 2018, 12:57:15 PM
Haha cheers.... they always say you can’t polish a turd.... but you can roll it in glitter

I think Gary Glitter was already a turd,

Gotta say i don't normally like 4 into 1 pipes, but on yours it looks good, very nice job and unusual colour.
Title: Re: CB750K4 New project
Post by: Rob62 on August 05, 2018, 08:56:48 AM
Thanks guys....  :) The 4 into 1 sounds nice, i always prefer the clean sound compared to the 4 into 4. Plus at £280 new for a full stainless system they are a bit of a bargain.
Title: Re: CB750K4 New project
Post by: Laverda Dave on August 05, 2018, 09:26:32 AM
Well done, it's a peach. The exhaust looks great.
Title: Re: CB750K4 New project
Post by: Spitfire on August 05, 2018, 06:00:16 PM
Great looking bike, nice one

Cheers

Dennis
Title: Re: CB750K4 New project
Post by: Rob62 on August 09, 2018, 05:21:19 PM
Woooohoooooo !!!! I have a registration number, exactly 2 weeks after i sent off the application, its an M reg 😄

Many thanks to all those who gave advice on what to include in the registration application...... now for some number plates.
Title: Re: CB750K4 New project
Post by: Nurse Julie on August 09, 2018, 05:30:35 PM
Great news, these things are easy when you send off everything they need to do the job !!!
Title: Re: CB750K4 New project
Post by: paul G on August 09, 2018, 08:57:11 PM
Great looking bike rob. I fitted a Delkevic to the Z650 cafe and the do sound sweet.
Title: Re: CB750K4 New project
Post by: Rob62 on August 10, 2018, 09:30:23 PM
Just back from the first shakedown run. No major problems to report, everything seems to work quite nicely.. The suspension is on the firm side but ok (TEC shocks as suggested on the forum),  no clonks or rattles from the running gear. Front brake is a little weak (new pads) rear brake is ok. The engine and gearbox is smooth, no rattles, leaks or burning oil. The gearbix has an audible but quite pleasant whine through all the gears which i guess is normal?. The Delkevic exhaust sounds absolutely awesome although I only went up to 5k revs and part throttle first time out. The throttle is a little stiff, cables need lubricating and the gear lever is way too high and needs adjusting. The engine paint i used is hopefully curing in the garage now its had a good heat cycle, could smell it when i got back. The most depressing thing is that the best summer in living memory appears to be over just as I'm finally finished.. I’ll go for a run to squires cafe tomorrow if the sun comes out, yippeee  ;D
Title: Re: CB750K4 New project
Post by: Rob62 on August 10, 2018, 09:33:23 PM
Just one thing, the engine just stutters ever so slightly when coming off closed throttle, only noticed it as i was almost back home...... a bit of carb fettling may be necessary
Title: Re: CB750K4 New project
Post by: hairygit on August 10, 2018, 09:35:11 PM
NO NO NO! Never oil cables, most are nylon lined these days, and oil will make the nylon swell and make the cable stiffer! Even most aftermarket cables are nylon lined, and if they are stiff, it's more likely to be cable routing.
Title: Re: CB750K4 New project
Post by: Rob62 on August 10, 2018, 09:48:42 PM
Thanks for the tip hg, although i must say thats a new one on me, nylon absorbing oil...  but i will take heed and see what else i can do to remedy the issue..
Title: Re: CB750K4 New project
Post by: hairygit on August 10, 2018, 09:54:51 PM
No, it's the oil reacting with the nylon, which is itself a product of oil, it makes the lining sticky and stiff. If they are new cables check they are correctly routed, as it certainly shouldn't be like that with new cables.
Title: Re: CB750K4 New project
Post by: Green1 on August 10, 2018, 09:56:56 PM
Agree with Hairy again  :o don't lube cables.
Cable route is the most likely cause or even the throttle lock screw on the right hand switch
Title: Re: CB750K4 New project
Post by: Rob62 on August 10, 2018, 09:58:44 PM
They are new gen Honda, the routing looks ok although they do bend slightly as they pass the coils and attach to the carbs.... i had them on and off a dozen times when i was rebuilding her, until i was satisfied... will have another look tomorrow. Cheers.
Title: Re: CB750K4 New project
Post by: Rob62 on August 10, 2018, 10:00:26 PM
You might be onto something there G1... the stiffness did seem to be at the throttle grip end come to think of it.... ill be all over it tomorrow morning  ;)
Title: Re: CB750K4 New project
Post by: Green1 on August 10, 2018, 10:09:19 PM
I have spent ages trying to lighten the throttle on my 550 it weighs a ton at 3/4 throttle.
I have now come to the conclusion it must be the return spring so just going to live with it now. But what I cant work out is why it goes light again past 3/4 
Title: Re: CB750K4 New project
Post by: Nurse Julie on August 10, 2018, 10:13:41 PM
I have a very, very, heavy throttle on my CB550 and mine is definitely the spring. I need to put a different one on but it can wait for a snowy day to be done.
Title: Re: CB750K4 New project
Post by: Green1 on August 10, 2018, 10:16:39 PM
Is it like mine and goes light again?
Title: Re: CB750K4 New project
Post by: K2-K6 on August 10, 2018, 10:32:41 PM
Make sure you've not taken too much "slack" out of the throttle pull cable.

Honda are specific about this and give a rotation amount of play that should be in the twist grip at rest.

The push/return cable is usually set with no real adjustment possible but if you tighten the pull cable too much it'll give you a conflict as they run differing routes slightly.  It'll also feel different from turning the steering lock to lock and may even stop you from being able to turn the throttle in extreme cases.

It looks and feels odd to have what appears alot of play at the twist grip but they are designed like that.

The effort will vary slightly throughout range as those forks on the carb slide shift geometry as you move the throttle.
Title: Re: CB750K4 New project
Post by: Nurse Julie on August 10, 2018, 10:40:59 PM
Is it like mine and goes light again?
Nope, mine stays constantly heavy, bloody makes my hand and wrist ache after not too many miles. I even have 3 little callus's on my hand and a blister...but I do have very small hands so I'm probably just having to grip the throttle so tight to twist it. Hasn't stopped me doing almost 2000 miles on it though 🙂🙂🙂
Title: Re: CB750K4 New project
Post by: Seabeowner on August 11, 2018, 10:24:39 AM
Even fully throttle fully closed the spring on my 500 was still stretched quite a bit. I added a small key ring loop (maybe 9mm) at the top to effectively shorten the distance the spring is stretched over. Not clever enough to work out spring rate change as spring stretched, but still snaps closed and reduced hand fatigue.
Title: Re: CB750K4 New project
Post by: Rob62 on August 11, 2018, 09:46:30 PM
I put a bit of grease onto the throttle tube and the action is ok now. I suspected that the slight hesitation off a closed throttle could be the inlet rubbers leaking so today i temporarily packed the clamps with some rubber strips, a right pain in the ass fiddly, job but it cured the problem. So now i need to buy some new clips which will tighten the rubber inlet rubber properly for a permanent solution. Quite frustrating as the new rubbers are genuine honda and the clips are original in decent condition, but as discussed before on another thread, they simply done clamp the hose effectively, bottoming out before they are tight enough. Dont want to use jubilee clips so will have to find an alternative that looks right.

Title: Re: CB750K4 New project
Post by: Rob62 on August 12, 2018, 12:16:13 PM
Just ordered a set of inlet rubber clamps from Z1 parts.... 22 quid including 12 postage. The same items from david silvers are £8.80 or £10.56 inc VAT each !! Thats £84.48 for a set of 8, plus their usual 6 quid postage which they apply regardless of whether you are spending 5 quid or 500.....

I have spent over a grand with them in the last year, as I’m sure many others have too, but I have come to realise that they don’t appreciate your custom. They give nothing away, not even a sticker let alone free shipping. By comparison I buy an air filter and some seals from wemoto and i get a key ring or a notepad... rant over  ;D
Title: Re: CB750K4 New project
Post by: Nurse Julie on August 12, 2018, 12:55:42 PM
We put in a big order with Z1 Parts yesterday and we use them very regularly. Even taking into account postage at around £35.00 and the import duties etc, the whole invoice was quite a few hundred pounds cheaper than DS. The parts will arrive later this week, so worth doing.
Title: Re: CB750K4 New project
Post by: Rob62 on August 12, 2018, 05:26:12 PM
I can well believe it.... Its amazing having to buy stuff from overseas to save money, but with suppliers like dick turpin..err...i mean david silvers, its no surprise.... I couldn’t find any other suppliers of similar clamps in the uk although I didn’t spend all day looking.

I doubt whether my order will attract much duty (if any) but even if it does it will still be cheap.
Title: Re: CB750K4 New project
Post by: Bryanj on August 12, 2018, 06:45:22 PM
3% duty then add together cost+duty+postage then add 20% Vat and on top of that £11 to the post office for passing on the money from you to HMRC
Title: Re: CB750K4 New project
Post by: Nurse Julie on August 12, 2018, 07:11:35 PM
Even with all that taken into account Bryan, it still works out alot cheaper than DS.
Title: Re: CB750K4 New project
Post by: hairygit on August 12, 2018, 08:03:30 PM
If that is all he ordered, it should not attract duty OR V.A.T. only when the value of the goods exceed £15 does duty apply.
Title: Re: CB750K4 New project
Post by: Rob62 on August 16, 2018, 09:38:06 PM
My new inlet clamps haven’t arrived yet, but it was classic bike night at Squires cafe, the sun was out, so I decided to have a little run, its only 20 min run from my house...still only done 50 miles in total since the rebuild so taking it easy, especially when the intakes are a tad loose... Anyway only got about a mile down the road when she started missfiring a bit... hmmmm what to do, keep going or turn back? the missfire gets a bit worse so turn back, bugger!!. Whip the plugs out and all seem ok except #4 which looks a little sooty.... check the inlets and seem ok.... strange, was running perfect the last time i rode her... Decided to remove the points cover and check the timing, before i do i fire her up with the cover off and hey presto the #1/4 points ar sparking like hell. So off comes the brand new DS condenser and back on goes one of the 40yo? condensers she arrived here wearing... Running perfect again so off I went to Squires... hopefully the new clamps will be here soon and then i can confidently get out for a good long run.
Title: Re: CB750K4 New project
Post by: Rob62 on August 19, 2018, 08:30:00 PM
Had a great weekend at the NERDOC rally, arrived home this afternoon and my new intake clips were waiting for me. Unfortunately, although they are a different design to the originals, they too do not put anywhere near enough clamp on the gen Honda intake rubbers. So as they were inexpensive i decided to modify them by shortening by about 5 or 6mm and re-drilling. Will fit them tomorrow but a test fit already looks like they will do the job.
Title: Re: CB750K4 New project
Post by: Rob62 on August 29, 2018, 09:57:16 PM
Just rolled over 210 miles tonight and the 2nd of my new condensers packed in... luckily i was half expecting it and had the 40 year old original condenser in my rucksack... so thats 2 condensers gone in 50 & 200 miles, not great... Gonna have to find a more reliable source (the failed units were ds) until i get round to fitting electronic ignition.
Title: Re: CB750K4 New project
Post by: Rob62 on October 07, 2018, 09:44:18 PM
Been out on the CB again today... have hardly touched any of the other bikes since she was completed back in july.. just coming up to 600 miles and apart from the dodgy condensers she hasn’t missed a beat. Smooth, comfy, sounds great, handles ok... really loving it. Here she is under the car port after another little run out. Can’t see me ever parting with this one  :D
(https://i.postimg.cc/vTM5K53G/3_C9_E69_B1-5_BC0-40_BA-_A0_E0-_AA77_CC3_A2_B92.jpg) (https://postimg.cc/YGn4GG5P)
(https://i.postimg.cc/9FkrRGZz/40_E7_A3_CA-_A12_D-4_A04-8_DF3-2403_E390_D85_C.jpg) (https://postimg.cc/MvyWgfs8)
Title: Re: CB750K4 New project
Post by: petermigreen on October 07, 2018, 09:56:33 PM
Congratulations. Loving my 750 too. It is very difficult to find reasons to ride any of the others!
Title: Re: CB750K4 New project
Post by: SumpMagnet on October 08, 2018, 09:48:05 AM
You enjoy riding that...and I can see why :)

As I get older, I start to realise that my reflexes are getting slower, and my ability to handle what a modern bike can provide is diminishing. Speed cameras, average speed limits and idiotic drivers more interestered in updating facebook and checking their e-mails than lkooking where they are going...cyclists who don't think traffic signals or one way streets apply...and pedestrians who assume that they are protected by law when they step into the road, thus obviating any need to look....well...it all adds up.

Makes it time to own something that is more fun at a slower speed, and one whose abilities more reflect my own. The look...the sound....the smell of hot oil ( as long as it's not dripping in a puddle under neath ) and the 'old farts' who will wander up to tell you they owned one just like it back in the day. Priceless.

So it won't nudge 200mph? Yeah. Park it up next to a GSX1000R and I bet it gets more attention.
Title: Re: CB750K4 New project
Post by: Rob62 on October 08, 2018, 07:53:04 PM
Couldn’t have put it better sumpmagnet.... 8)
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