Honda-SOHC

SOHC.co.uk Forums => CB750 => Topic started by: JamesH on June 09, 2018, 10:13:07 AM

Title: 1970 (01/70) CB750 restoration
Post by: JamesH on June 09, 2018, 10:13:07 AM
Thought I’d start this thread to document my latest K0 restoration...

The start...photo was taken back in 2016. Note the incorrect front end...correct K0 forks and single cut fender came with the bike and were temporarily re-fitted in late 2016.

(https://uploads.tapatalk-cdn.com/20180609/80fbbd28b584ca3ee564d92ed0194962.png)
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 09, 2018, 11:00:03 AM
Engine out of the frame and off to Graham for a rebuild (this was early last year).

Checking the condition of the frame prior to blasting / zinc priming.
(https://uploads.tapatalk-cdn.com/20180609/5638c8c69f62b3302f0fc0670d6ccdf8.jpg)
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 09, 2018, 11:04:46 AM
Completed engine after lots of hard work (Graham’s hard work, not mine). The man is a legend.

(https://uploads.tapatalk-cdn.com/20180609/87abbdd1d55e46f60e8546fe04ef3ee7.jpg)

(https://uploads.tapatalk-cdn.com/20180609/80829766f71b697fff8fba98a54e8728.jpg)
Title: 1970 (01/70) CB750 restoration
Post by: JamesH on June 09, 2018, 11:08:20 AM
Engine ready to go back in the frame, which has been stripped, zinc etch primed, flatted, 3 coats of satin, satin laquer finish (all black painted cycle parts have received the same treatment).

Probably a bit OTT if I’m honest as they were never this good from the factory.

(https://uploads.tapatalk-cdn.com/20180609/3bd325d653a8f57f2fbcf7a2571fe7a7.jpg)

(https://uploads.tapatalk-cdn.com/20180609/ca83f3bc555fd891df4f509e04f38f0d.jpg)

(https://uploads.tapatalk-cdn.com/20180609/8a2102d179a2c275a7fd609aa66d7de0.jpg)
Title: 1970 (01/70) CB750 restoration
Post by: JamesH on June 09, 2018, 11:13:12 AM
Engine back in the frame, headstock rebuilt with new bearings..
(https://uploads.tapatalk-cdn.com/20180609/af8ebe26fee94ae15e66790d1dd0fbb2.jpg)

(https://uploads.tapatalk-cdn.com/20180609/1dba0887cb8520d0bfd35495939bb595.jpg)

Title: 1970 (01/70) CB750 restoration
Post by: JamesH on June 09, 2018, 11:18:53 AM
Rebuilt forks back on. Refurbished swingarm refitted with Yamiya rear shocks.

New Honda rear fender (3 hole) fitted with refurbished original inner fender. As with the front fender I’ve opted for New Honda parts here rather than rechromed originals.

All electrics cleaned, checked, refitted. Genuine Stanley indicators.

I’m using a Yamiya CB Green body set for this one (bike was originally CB green).

Lots of original parts re-zinced. Some fasteners missing so have used a Yamiya No. ‘8’ bolt kit where necessary.

NOS Honda bars with new switch gear.

Ignore the ‘heath robinson’ jacking arrangement - it’s much more stable than it looks..(honest).

(https://uploads.tapatalk-cdn.com/20180609/6c4a0bd8381d0d55bcc596b9612849a5.jpg)

(https://uploads.tapatalk-cdn.com/20180609/6a8a6f20f0cc16603a433dea7009b86e.jpg)

(https://uploads.tapatalk-cdn.com/20180609/c87329b0ea498308d934c54472a006b8.jpg)

(https://uploads.tapatalk-cdn.com/20180609/a913de010705d1a68ce857774f9d4652.jpg)

(https://uploads.tapatalk-cdn.com/20180609/43f6beb91a16abfad022bdca71cd6870.jpg)
Title: 1970 (01/70) CB750 restoration
Post by: JamesH on June 09, 2018, 11:26:05 AM
Plated parts ready to fit.

Both wheels fully stripped, rebuilt with new bearings, hubs polished/inners painted (my preference). Note front wheel bearings hadn’t been replaced in this photo (old seal and chewed up bearing retainer clearly visible).

(https://uploads.tapatalk-cdn.com/20180609/23a307c2389b4d6f7b7189f6403ff55a.jpg)

(https://uploads.tapatalk-cdn.com/20180609/4c15b3f6a55375fafe1736c7ff386575.jpg)

(https://uploads.tapatalk-cdn.com/20180609/0d87402b1d1cea0a6a5cbf1ade81e483.jpg)
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 09, 2018, 11:29:09 AM
Oil tank chemically stripped and repainted.

Front end fully rebuilt and brake system fully rebuilt with Honda parts.

Yamiya seat test-fitted.

Airbox upper test fitted.

Starting to look the part....

(https://uploads.tapatalk-cdn.com/20180609/eb8e7872a50f538cc78e4d54752fb3b9.jpg)

(https://uploads.tapatalk-cdn.com/20180609/380a8ae345a4bf757acced637e7ef24d.jpg)

(https://uploads.tapatalk-cdn.com/20180609/4df08809ee90eccf76515e259c761c0f.jpg)
Title: 1970 (01/70) CB750 restoration
Post by: JamesH on June 09, 2018, 11:32:24 AM
Back on her feet with new shoes on..(Conti RB2/K112).

All electrics wired and working.

Rear light fitted.

Original master cylinder stripped, painted, rebuilt with Honda m/c kit.

Using a Genuine Honda front fender (should have a single-cut front fender but small compromise here as even a re-chromed original wouldn’t quite hit the mark).

New oil lines from Germany rebuilt to OEM braided finish.

Original side panel emblems refurbished, ‘grilles’ repainted and assembled onto Yamiya covers. Fit of the side panel emblems is so much better with original compared to reproduction items.

Yamiya short rear chain guard fitted.

The CB-green colour is amazing IMHO.

(https://uploads.tapatalk-cdn.com/20180609/9b159c425b0ac9ae5496fa22640ddeab.jpg)

(https://uploads.tapatalk-cdn.com/20180609/bd7e008ea3aae601372bfa011e7a5c35.jpg)

(https://uploads.tapatalk-cdn.com/20180609/976bb0714ac8b9f025547dab89d22d85.jpg)

(https://uploads.tapatalk-cdn.com/20180609/13c70ed3fedd56a0d64067dd0f55dccf.jpg)

(https://uploads.tapatalk-cdn.com/20180609/7a6b57f55b3e38da3fa43e9fd1b731b5.jpg)

(https://uploads.tapatalk-cdn.com/20180609/ab3fe6e327ea750ae0eb31e3af7b99c8.jpg)

(https://uploads.tapatalk-cdn.com/20180609/923f1d1ec9cbe6564cad00fefcf78e94.jpg)

(https://uploads.tapatalk-cdn.com/20180609/1e3788e0b9b24d6a16fbde25412dd5d7.jpg)
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 09, 2018, 11:38:43 AM
Will be re-assembling the Carbs Tuesday evening so will post more pics then.

James
Title: Re: 1970 (01/70) CB750 restoration
Post by: Green1 on June 09, 2018, 12:14:10 PM
Looking Great  8)
Shame we never get clean roads to use them on.
Title: Re: 1970 (01/70) CB750 restoration
Post by: UK Pete on June 09, 2018, 12:45:57 PM
Looks so good James
Wish I had the time and money to do the same to the many bikes I have laying around

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Title: Re: 1970 (01/70) CB750 restoration
Post by: Johnwebley on June 09, 2018, 01:21:07 PM


   really brilliant,
   looking great .

   hope she rides as well as she looks
Title: Re: 1970 (01/70) CB750 restoration
Post by: Sgt.Pinback on June 09, 2018, 02:27:48 PM
Hi ...

How did you refurb the inner fender? I gave up and bought a new one.

Why wouldn’t a rechromed single cut fender be adequate ?
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 09, 2018, 02:49:31 PM
Hi ...

How did you refurb the inner fender? I gave up and bought a new one.

Why wouldn’t a rechromed single cut fender be adequate ?
Wet/dry and then polishing compound Uli. My chrome supplier is pretty good, but doesn’t like doing fenders and it was easier/cheaper and a better finish to use a new Honda part.
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 09, 2018, 02:50:16 PM


   really brilliant,
   looking great .

   hope she rides as well as she looks
Looking Great  8)
Shame we never get clean roads to use them on.
Looks so good James
Wish I had the time and money to do the same to the many bikes I have laying around

Sent from my SM-G930F using Tapatalk
Thanks for the comments chaps; means a lot. James
Title: Re: 1970 (01/70) CB750 restoration
Post by: Sgt.Pinback on June 09, 2018, 02:56:30 PM
What VIN is she? I still don’t know when single cut fenders were used.

Yes, great work as usual.
Title: Re: 1970 (01/70) CB750 restoration
Post by: Sgt.Pinback on June 09, 2018, 03:02:33 PM
All in that range, which one is the lowest?

My 18907 came with DC.
Title: Re: 1970 (01/70) CB750 restoration
Post by: Nurse Julie on June 09, 2018, 03:08:19 PM
Bike looks great James, the engine looks stunning in the frame, I remember it well 😭😭😭😭
Title: Re: 1970 (01/70) CB750 restoration
Post by: Rob62 on June 09, 2018, 04:59:38 PM
Beautiful restoration James....
Title: Re: 1970 (01/70) CB750 restoration
Post by: royhall on June 09, 2018, 05:21:21 PM
Tremendous job James, you have a right little production line going there.
Title: Re: 1970 (01/70) CB750 restoration
Post by: RGP750 on June 09, 2018, 06:55:52 PM
Fantastic job James.
Will you ride it up to DS anniversary day?
May ride mine up if the weather is ok, James with the Sand cast wants to ride up, will ask Mick as well.
Title: Re: 1970 (01/70) CB750 restoration
Post by: Arch stanton on June 10, 2018, 09:00:35 AM
Hello James.
Great work & attention to detail.
Please excuse my ignorance but. What is a single cut fender?
Also. What satin black paint do you recommend? I always used the old PJ1. But I have heard the new stuff in not as good.
Regards.
Sean.
Title: Re: 1970 (01/70) CB750 restoration
Post by: neat street on June 10, 2018, 10:14:10 AM
Brilliant James! great work as always. love looking at all the great work you guys (and lady) do. well done!
Title: Re: 1970 (01/70) CB750 restoration
Post by: petermigreen on June 10, 2018, 01:29:28 PM
Hello James.
Great work & attention to detail.
Please excuse my ignorance but. What is a single cut fender?
Regards.
Sean.
I was hoping someone would ask that
Title: Re: 1970 (01/70) CB750 restoration
Post by: SteveD CB500K0 on June 10, 2018, 02:00:15 PM
Me too


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Title: 1970 (01/70) CB750 restoration
Post by: JamesH on June 10, 2018, 03:10:11 PM
Hello James.
Great work & attention to detail.
Please excuse my ignorance but. What is a single cut fender?
Also. What satin black paint do you recommend? I always used the old PJ1. But I have heard the new stuff in not as good.
Regards.
Sean.
Hi Sean - essentially there were 4 types of front fender on the cb750.
The ‘cut’ refers to the shraper ‘cut’ finish to the leading and trailing edges of the fender (i.e not Rolled).

Sandcast and early ‘69 diescast had double-cut (so beoth front and trailing edge was cut.

Later diecast (around 12/69 or 01/70) had the single cut to the rear edge. I’ve seen these run through to early K1 production. The front edge was rolled.

From K1 both rolled edges.

From late K2 they changed the fork design so the mounting bracket changed - but the blade was again fully rolled.

Hope that helps..
Title: Re: 1970 (01/70) CB750 restoration
Post by: Sgt.Pinback on June 10, 2018, 03:30:57 PM
Zwo types of double cut fenders: without hole for the speedo cable holder (early sandcast) and with hole (later SC and early diecast)
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 10, 2018, 03:45:46 PM
Zwo types of double cut fenders: without hole for the speedo cable holder (early sandcast) and with hole (later SC and early diecast)
Good point Uli - my 57xx sandcast has the speedo cable guide hole...
Title: Re: 1970 (01/70) CB750 restoration
Post by: Sgt.Pinback on June 10, 2018, 03:56:24 PM
My # 1983 has no cable holder hole. Took me almost two years to find that fender.
Title: Re: 1970 (01/70) CB750 restoration
Post by: UK Pete on June 10, 2018, 04:11:01 PM
My sandcast guard had no hole I traded it with rich for other parts big mistake on my part
My early k0 front guard also has no hole have that one still and it will go on my sandcast
Zwo types of double cut fenders: without hole for the speedo cable holder (early sandcast) and with hole (later SC and early diecast)
Good point Uli - my 57xx sandcast has the speedo cable guide hole...

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Title: Re: 1970 (01/70) CB750 restoration
Post by: Sgt.Pinback on June 10, 2018, 05:24:38 PM
Just had a look into the parts book: that cable holder grommet came with# 15593.

Sorry to say, all sandcast and early  diecast  up to # 15592 had fender without hole.
Title: Re: 1970 (01/70) CB750 restoration
Post by: Green1 on June 10, 2018, 05:26:22 PM
My k1 manufactured in April came with a single cut front guard and I'm fairly confident it was the original front end on the bike too.
Unfortunately it was damaged shortly after I registering the bike when a twat on site backed into it.
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 10, 2018, 06:51:30 PM
Tremendous job James, you have a right little production line going there.
Beautiful restoration James....
Bike looks great James, the engine looks stunning in the frame, I remember it well
Fantastic job James.
Will you ride it up to DS anniversary day?
May ride mine up if the weather is ok, James with the Sand cast wants to ride up, will ask Mick as well.

Thanks for the compliments..

Rich - not sure if I’m here for the DSS event - if I am I’ll certainly take one of the 750’s up. Just depends what I have at the time road-ready.
Title: Re: 1970 (01/70) CB750 restoration
Post by: Green1 on June 10, 2018, 09:33:15 PM
I didn't even know about DSS doing an anniversary day.
If I go I may even wash the bike as I always have the rattiest bike at any event.
Title: Re: 1970 (01/70) CB750 restoration
Post by: UK Pete on June 10, 2018, 09:50:36 PM
What is the date of this ds anniversary meet up
I didn't even know about DSS doing an anniversary day.
If I go I may even wash the bike as I always have the rattiest bike at any event.

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Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 10, 2018, 10:41:18 PM
What is the date of this ds anniversary meet up
I didn't even know about DSS doing an anniversary day.
If I go I may even wash the bike as I always have the rattiest bike at any event.

Sent from my SM-G930F using Tapatalk
Think it’s the 29th September Pete..
Title: Re: 1970 (01/70) CB750 restoration
Post by: Sgt.Pinback on June 11, 2018, 06:00:08 AM
.......
Title: Re: 1970 (01/70) CB750 restoration
Post by: SteveD CB500K0 on June 11, 2018, 06:54:15 AM
The one we have been discussing is 24th June. Classic Bike Day (not just CB750s )


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Title: Re: 1970 (01/70) CB750 restoration
Post by: UK Pete on June 11, 2018, 07:27:34 AM
24th of June is a no no for me but the 29th is so good possibility especially as I love the 750

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Title: Re: 1970 (01/70) CB750 restoration
Post by: Speed on June 11, 2018, 10:16:22 AM
absolutley stunning, a credit to you
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 11, 2018, 11:25:01 AM
absolutley stunning, a credit to you
Many thanks.
Title: Re: 1970 (01/70) CB750 restoration
Post by: Seabeowner on June 11, 2018, 04:18:10 PM
Absolutely beautiful work James and Graham. Makes my 500s look dull.  :'(
As said earlier, I would be afraid to take it near our roads without them getting a thorough scrubbing first. Presume that it will be sold on and hope it goes to someone who will set it free occasionally and not leave it locked away.
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 11, 2018, 08:04:00 PM
Finished the carbs this evening. Completely rebuilt / plated from top to bottom. Very happy with the results. These are one of the most time consuming tasks on these bikes but very therapeutic when done right.

(https://uploads.tapatalk-cdn.com/20180611/975b296d8652583601095ca4d6b88463.jpg)

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(https://uploads.tapatalk-cdn.com/20180611/af010570b4e11dfdec808dc4c20e35cc.jpg)
Title: Re: 1970 (01/70) CB750 restoration
Post by: Nurse Julie on June 11, 2018, 08:20:22 PM
Beautiful James. I always think a newly refurbed set of carbs are worthy of a place in a display cabinet, better than any ornament.
Title: Re: 1970 (01/70) CB750 restoration
Post by: RGP750 on June 11, 2018, 09:02:36 PM
Nice looking plate James.!!
Seriously, great job
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 11, 2018, 09:13:31 PM
Nice looking plate James.!!
Seriously, great job
Made by the best in the business Rich . Awesome work Rich. Perfect fit.
Title: Re: 1970 (01/70) CB750 restoration
Post by: philward on June 11, 2018, 11:07:50 PM
They look fantastic James - top job (as usual)
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 12, 2018, 10:42:08 PM
Carbs and pipes fitted this evening. Discovered a leak in float bowl #1 (miniscule crack in overflow pipe). Will sleeve/epoxy repair tomorrow.

Tank badges, cap, fuel tap and strips a job for tomorrow.

Should be ready for first fire early next week.

(https://uploads.tapatalk-cdn.com/20180612/0de772a3fb0db6b947bc755ac29f203a.jpg)

(https://uploads.tapatalk-cdn.com/20180612/827f3b58ec45ec7586fadbc89f7acaf8.jpg)

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(https://uploads.tapatalk-cdn.com/20180612/547592d9ceb80f59c5f77f47582224d5.jpg)
Title: Re: 1970 (01/70) CB750 restoration
Post by: MrDavo on June 13, 2018, 12:44:08 AM
Lovely job as ever, while we’re talking attention to detail though, does it have a helmet lock, or did you just have a sticker left over?
Title: Re: 1970 (01/70) CB750 restoration
Post by: Sgt.Pinback on June 13, 2018, 08:17:03 AM
In my eyes the carbs are a bit too good (bowls, upper top rings..)
Battery earth cable with plasic cover?

But thats complaining at a very high level.
Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 13, 2018, 08:51:51 AM
Lovely job as ever, while we’re talking attention to detail though, does it have a helmet lock, or did you just have a sticker left over?
left over sticker Dave. Good spot. No idea why I put it there now ha ha..
Title: 1970 (01/70) CB750 restoration
Post by: JamesH on June 13, 2018, 08:53:05 AM
In my eyes the carbs are a bit too good (bowls, upper top rings..)
Battery earth cable with plasic cover?

But thats complaining at a very high level.
Uli, I’ve ordered some of these for you ....

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F262330632747

Both fair points though.
Title: Re: 1970 (01/70) CB750 restoration
Post by: UK Pete on June 13, 2018, 10:13:53 AM
I thought the bare braided earth cable was just sandcast and 69 k0,s.is there a part no change lisyed5

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Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 13, 2018, 10:15:11 AM
I’ve got 1/70 bikes (original, unrestored) with both Braided and Plastic costed earths straps. I suspect the transition happened sometime in Jan/70.
Title: Re: 1970 (01/70) CB750 restoration
Post by: UK Pete on June 13, 2018, 10:16:49 AM
Did we ever find a source for the braided

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Title: Re: 1970 (01/70) CB750 restoration
Post by: JamesH on June 13, 2018, 10:19:14 AM
Did we ever find a source for the braided

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Not that I’m aware of Pete...
Title: Re: 1970 (01/70) CB750 restoration
Post by: Mr_Sheene on June 17, 2018, 03:49:55 PM
A beautiful job James and a nice set of useful pictures for a 'newbie' like me. I'll go through this piece a few times with a note pad, as the dates of production line mods is confusing on a good day. It's just that I've been in the garage to look at mine and now feel thoroughly depressed. I'm just off to a dark room now for a quiet cry. I may be some time.
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