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SOHC.co.uk Forums => CB750 => Topic started by: Simon46 on May 21, 2018, 02:39:58 PM

Title: Simon46 1978 CB750K American project
Post by: Simon46 on May 21, 2018, 02:39:58 PM: The shopping list begins
2 fork seals or seal mate?
Carb float bowl and o rings kit X4
Exhaust spacer lhs fabricated so centre stand doesn't rub on chain
Tail light lens
Fuel tank acid washed 1992 fuel varnish
Fuel tap (leaking out of tap lever face when on)
3.50-19 period tyre (cracked) and inner tube
120/90 period tyre (cracked) and inner tube
Front brake hose complete (cracked)
Rechrome RHS exhaust. Chrome fell off clean metal underneath
Shares in DS.

Getting carbs and engine running right before I tackle the rest

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Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on May 21, 2018, 02:55:11 PM: http://imgur.com/MABs6yP

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Title: Re: Simon46 1978 CB750K American project
Post by: Moorey on May 21, 2018, 03:26:16 PM: Linky no worky. :)
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on May 21, 2018, 03:31:12 PM: Trying again with public selected. Sorry new to this
https://i.imgur.com/RLOHBBI.jpg

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Title: Re: Simon46 1978 CB750K American project
Post by: Moorey on May 21, 2018, 04:31:47 PM: That looks to be in decent nick.
Title: Re: Simon46 1978 CB750K American project
Post by: Seabeowner on May 21, 2018, 04:42:13 PM: I've done two 550 imports that were sort of running and sort of complete. One had 20k and one 30k and had a life of riley in the thin air of the USA. I spent about 1.2 times what the bikes cost me just to get them satisfactory and on the road.
You've got the tank and I presume the side panels, so maybe not much to search for from the look of it.
Good luck Simon
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on May 21, 2018, 05:01:56 PM: Side panels pulling them they cracked. Stuck in grommets Pissed

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Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on May 21, 2018, 05:14:10 PM: Tank is in dixon radiator repairs at the moment. Hopefully it comes out intact. Budget on this is 500. 170 already spent. My dt 175mx build took 2200 out my pocket. My 87 XT600 stands at 200 quid. Both on road. No stranger to basket cases!

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Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on May 24, 2018, 02:46:13 PM: Cracks in rubber.
Can anyone point me in the right direction for a front brake hose. Is non period braided a no no? Switch is in handlebar so one piece hose from master to slave.
Also need tyres front and back. What would you recommend?

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Title: Re: Simon46 1978 CB750K American project
Post by: hairygit on May 24, 2018, 04:34:41 PM: It's your bike, and unless you're planning a museum quality restoration, which with your budget I'm assuming not, by all means use modern braided brake hoses. If you're worried they may look too modern, you can buy them with black (or about 10 other colours!) plastic sheathing over the top of the braiding, so it would look like standard hose until you got close up to it.
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on May 24, 2018, 05:07:44 PM: Thanks HG. I've emailed DS part obsolete not in stock. Going to take it to Stockport hydraulics to see if they can do it in braided. Mines just not 2 pieces which I can get off ebay. Will report back on outcome.
Not sure the budget will stay under target for this build (again)

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Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on May 24, 2018, 06:43:05 PM: Ah brand new batt drops from 11.8 (yes it's rundown with all the starting) to 11.3 when idling. More digging. Am searching the threads now.

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Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on May 28, 2018, 11:18:35 AM: Preliminary testing from the 3 yellow wires from the stator shows no reading from one to any others. However wiggle the wire where it goes into the engine and a reading briefly shows.
Field coil OK at 7 ohms.

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Title: Re: Simon46 1978 CB750K American project
Post by: hairygit on May 28, 2018, 11:47:15 AM: Obviously a break in the wires then, replacement wires being the easiest option.

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Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on May 28, 2018, 03:07:05 PM: Honda parts seem to be more readily available than the yams. Will look into loom. Thanks HG

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Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on May 29, 2018, 03:00:55 PM: Sprocket cover removal.
Do I have to be a jedi and use the force to extract this?

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Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on May 29, 2018, 04:22:36 PM: Turns out needed to pull the cover anyway.
Oil leak
http://imgur.com/gallery/FpDLh47
Is there a gasket for the cover? Or just seal it on

https://i.imgur.com/4GaCQkS.jpg

And a locking bit for the sprocket?

Cb750 sprocket https://imgur.com/gallery/o5HvKan
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Think I found my charging fault
Cb750 not charging https://imgur.com/gallery/hpHlqej
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on June 03, 2018, 11:08:32 AM: Many thanks to Alan's electrics (Big Al) for supplying me with the alternator sub loom. Even threw in the 3 male connectors and sleeves to replace the melted ones for free!
Cb750 alternator sub loom fitted from Alan's electrics https://imgur.com/gallery/KC9ywos
Title: Re: Simon46 1978 CB750K American project
Post by: BigAl (Alan) on June 03, 2018, 04:46:30 PM: Thanks Simon, your field coil resistance value (7 ohms) is within the right area.
Very good images.

Alan
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on June 03, 2018, 09:14:49 PM: Cheers mate. Studied 5 yrs electronic engineering. I now fix domestic appliances self employed. A damn well engineered loom that is. Hats off to your skills!

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Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on June 09, 2018, 05:42:37 AM: Removed wheels for fitting new tyres and tubes
Cb750 doing a balancing act https://imgur.com/gallery/jYS6ekX

Well the tyres are fitted to the rims
Cb750 new tyres fitted https://imgur.com/gallery/s2JiHp2
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on June 10, 2018, 07:19:14 AM: Front brake hose arrived from furore
Cb750 front brake hose arrived https://imgur.com/gallery/dOKlZM5

Lever feels A lot less spongy than with the old cracked one
Cb750 front brake hose fitted https://imgur.com/gallery/Tw3a5n0
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on June 12, 2018, 10:48:14 AM: First time nervously on Road ride to mot test this morning insured on the vin number with no reg plate. And it passed! Woohoo. ;D ;D ;D
What a lovely smooth ride back. Those beeping indicators are a bit annoying. Every pedestrian could hear them.
Title: Re: Simon46 1978 CB750K American project
Post by: hairygit on June 12, 2018, 11:30:55 AM: Well done, always good to hear of success! As regards the indicator beeper, just disconnect it in the headlight shell, not a legal requirement, in fact Honda recommended dealers disconnected them because blind people would mistake it for a pedestrian crossing beeping.
Title: Re: Simon46 1978 CB750K American project
Post by: Underdog1 on June 12, 2018, 01:57:19 PM: I’ve got some aftermarket bars on my bike with 3.5inch rise compared to the 4.5 inch rise for standard uk bars.

If I ordered the braided hoses for a standard bike will the inch extra length be a bother? Possible to diy trim them down slightly if needed?
Title: Re: Simon46 1978 CB750K American project
Post by: Bryanj on June 12, 2018, 03:23:12 PM: Some braided hoses you can shorten BUT you will need a new crimp olive and they may not sell you that
Title: Re: Simon46 1978 CB750K American project
Post by: paul G on June 12, 2018, 04:01:26 PM: Rather than buying standard and cutting try these, I have used then a few times and they have been spot on.
You can buy all the bits and make your own.
https://www.venhill.co.uk/
Title: Re: Simon46 1978 CB750K American project
Post by: Bryanj on June 12, 2018, 06:01:20 PM: Be carefull with the female end fittings as on a lot of them the Honda nut on the end of the steel pipe will not tighten down as you need a nut with the first two threads missing due to the fitting threads not being deep enough OR an Op 2 pipe end with a double ended olive in the hole.

I found out all this the hard way!!
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on June 12, 2018, 08:51:11 PM: Thanks HG. All the mechanics came out of the garages to look at him. I've not seen one of those in years they said over and over. I felt like a film star :D
Title: Re: Simon46 1978 CB750K American project
Post by: Green1 on June 12, 2018, 09:47:35 PM: My front brake squeals even louder then the buzzer so you will still get every pedestrian look at you even after disconnecting it.
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on June 16, 2018, 10:54:01 PM: Just had to order the petcock from America
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on June 19, 2018, 02:21:54 PM: V55 just sent off with all the docs (nova, insurance on vin, driving licence, postal orders, American title with no 1978 month on it. I was rejected before on my dt175mx.
Fingers crossed.
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on June 22, 2018, 04:12:41 PM: Just kickstarted the 750 for the first time. Easy. A lot easier than my xt600 single!
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on June 26, 2018, 05:35:44 PM: Oil filter genuine arrived. Do I need to run it in this 30c heat?
Title: Re: Simon46 1978 CB750K American project
Post by: hairygit on June 26, 2018, 05:54:18 PM: Best if the oil is around 70-80 degrees, it flows out far more easily.
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on June 26, 2018, 09:05:28 PM: OK up to temp and done. Oil (yuk) Oil filter (yuk) and plugs from the 90s. I'm going to change it all again in the next month. Starts and idles better with oil light extinguished. Phew!
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on June 27, 2018, 09:19:04 PM: Letter from America arrived today. Fuel pipe rerouted from back exit of tap to rear of bike facing exit. Perfick.
Honda cb750k fuel petcock arrived from America to uk https://imgur.com/gallery/twuxE2b
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on July 04, 2018, 11:16:10 AM: Got a v5 arrived today. S reg. ;D .
Woohoo
But I'm in zante with the missus and it's in uk
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on July 19, 2018, 07:20:25 PM: First proper ride out today. Number plate now fitted last night.
Bumbled around still unsure of po work. Checked everything I could and got used to slow speeds. As I learnt the characteristics of the bike I found it very comfortable and as confidence built started leaning it into bends swerving round potholes etc. Then I thought let's take it on a dual carriageway. Hand on Clutch ready if it blew up. When it hits 6000 rpm sounds quite nice and has the power to get out of trouble if needed. I think it suits me. Feels like it would run forever.
Happy Simon 😊
Title: Re: Simon46 1978 CB750K American project
Post by: Nurse Julie on July 19, 2018, 07:33:13 PM: Brilliant. Lots of summer left so enjoy.
Title: Re: Simon46 1978 CB750K American project
Post by: Crispy on July 19, 2018, 10:19:46 PM: Nice one! Well done 👍
Title: Re: Simon46 1978 CB750K American project
Post by: Rob62 on July 20, 2018, 08:49:33 AM: Great stuff!! What about some pictures and movies :)
Title: Re: Simon46 1978 CB750K American project
Post by: Simon46 on July 20, 2018, 03:14:52 PM: Thank you all. Always love bringing a bike back from dead/broke down shoved in garage for 26 years. Just the nigglys. neutral light on dim in gear. And a burning oily smell at traffic lights. Turned out clutch cable outer touching exhaust manifold rhs. Thought I'd dropped a sump plug. Thought I was going to get run over when a vw amarok pickup at lights reversed backwards towards me to change lanes at kingsway gatley lights. Man that horn was loud and saved me and bike. Glad I tuned it cause it was a donk when I got it.
I like it a lot. :)