Author Topic: 1969 CB750 Sandcast #4645 restoration  (Read 1648 times)

Offline JamesH

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1969 CB750 Sandcast #4645 restoration
« on: February 11, 2020, 07:31:11 PM »
Evening all. Just about to start final assembly of my sandcast #4645, so thought I’d share progress in a new thread.

Will post pictures as-found, and at various stages of the restore...

For now, here she is ‘as-found’ near Denver, Colorado:




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Offline JamesH

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1969 CB750 Sandcast #4645 restoration
« Reply #1 on: February 11, 2020, 07:53:23 PM »
More pics as found.

The bike was taken off the road in the late 70’s.

The engine fitted when the bike was found (as pictured) was a later 6xxx sandcast which was apparently swapped into the bike very early in its life.

The original #4615 engine suffered from chain failure within weeks of being sold to the original owner (a fate suffered by many early 750’s).

Fortunately, the original engine was sitting in the field next to the bike when found...so came with the bike when I purchased her back in 2018

My plan was to fix and re-unite the bike with its original engine - as you’ll see in the coming posts this was a bit more of a challenge than expected.

Had it not been for Graham’s tenacity, skill and sheer bloody-mindedness (and me prodding from afar) this would never have happened..









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« Last Edit: February 11, 2020, 07:57:39 PM by JamesH »

Offline JamesH

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1969 CB750 Sandcast #4645 restoration
« Reply #2 on: February 11, 2020, 08:01:05 PM »
In Graham’s workshop the full horror story is revealed....

WTF was I thinking lol...??

Look away now..




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« Last Edit: February 14, 2020, 04:54:11 PM by JamesH »

Offline JamesH

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1969 CB750 Sandcast #4645 restoration
« Reply #3 on: February 11, 2020, 08:09:45 PM »
After hours and hours of reconstructive TIG induced surgery from Graham, we have a viable pair of engine cases again...

Graham made me sign a contract never to send him an engine like this again lol.

« Last Edit: February 11, 2020, 08:22:18 PM by JamesH »

Offline JamesH

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Re: 1969 CB750 Sandcast #4645 restoration
« Reply #4 on: February 11, 2020, 08:21:31 PM »
After a serious amount of hard Graft from Graham...




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Offline JamesH

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Re: 1969 CB750 Sandcast #4645 restoration
« Reply #5 on: February 11, 2020, 08:27:46 PM »
The engine and rear wheel were removed before I put the bike in the workshop for the initial strip..

The aim with this bike is to restore and refurbish as much as possible, given its rarity and the effort to reunite the bike with its original engine...




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Offline JamesH

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Re: 1969 CB750 Sandcast #4645 restoration
« Reply #6 on: February 11, 2020, 08:32:23 PM »
All the correct original features, 8 bolts everywhere, loads of work ahead...



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Offline JamesH

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1969 CB750 Sandcast #4645 restoration
« Reply #7 on: February 11, 2020, 08:36:37 PM »
After stripping, the frame was sent off to Maidstone Motoliner for a full alignment check. Tommy has done lots of 750’s for me in the past and is great to work with. The photo below is one of my previous bikes in the Motoliner jig.



The frame was stripped, zinc primed and 2k painted along with the other cycle parts..



Ready for its original engine (the first time they will have been back together in over 50 years)...

« Last Edit: February 11, 2020, 08:40:10 PM by JamesH »

Offline JamesH

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Re: 1969 CB750 Sandcast #4645 restoration
« Reply #8 on: February 11, 2020, 08:46:17 PM »
Frame built back up to a stage ready to accept the engine again.

All of the original fasteners were stripped and re-zinc’d.




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Offline Laverda Dave

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Re: 1969 CB750 Sandcast #4645 restoration
« Reply #9 on: February 11, 2020, 09:11:35 PM »
Amazing work James (and Graham). That bike was seriously crusty when you bought it!
Is the engine back in the frame now, when we're the last photos taken and when do you think you'll be riding it?
Keep the progress photos coming👍
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Offline JamesH

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1969 CB750 Sandcast #4645 restoration
« Reply #10 on: February 11, 2020, 09:16:04 PM »
These photos were taken yesterday after the engine was finally reunited with the frame...






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Offline JamesH

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1969 CB750 Sandcast #4645 restoration
« Reply #11 on: February 11, 2020, 09:26:42 PM »
Amazing work James (and Graham). That bike was seriously crusty when you bought it!
Is the engine back in the frame now, when we're the last photos taken and when do you think you'll be riding it?
Keep the progress photos coming
Thanks Dave. The previous post was from yesterday’s progress. Will be updating the thread over the next 6-8 weeks as the build progresses. Aim is to have her back on the road in April...


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« Last Edit: February 11, 2020, 11:03:20 PM by JamesH »

Offline Nurse Julie

  • 1973 CB750 UK K2.1977 CB550/4 Mongrel Brat. 1978 CB400/4.
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Re: 1969 CB750 Sandcast #4645 restoration
« Reply #12 on: February 11, 2020, 09:32:18 PM »
Quote 'Graham made me sign a contract never to send him an engine like this again lol.'
Ah yes, not seen that come back in the post yet James 🤔 🤔🤔🤣🤣🤣🤣🤣🤣🤣🤣
Im a Nurse, trust me, this won't hurt.....much !!!

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline JamesH

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Re: 1969 CB750 Sandcast #4645 restoration
« Reply #13 on: February 11, 2020, 09:34:37 PM »
Quote 'Graham made me sign a contract never to send him an engine like this again lol.'
Ah yes, not seen that come back in the post yet James
Ha ha - it was a verbal contract lol


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Offline Nurse Julie

  • 1973 CB750 UK K2.1977 CB550/4 Mongrel Brat. 1978 CB400/4.
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Re: 1969 CB750 Sandcast #4645 restoration
« Reply #14 on: February 11, 2020, 09:37:16 PM »
Quote 'Graham made me sign a contract never to send him an engine like this again lol.'
Ah yes, not seen that come back in the post yet James
Ha ha - it was a verbal contract lol


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Ah, OK, suits me, less paperwork for me to sort 😊😊😊😊
Im a Nurse, trust me, this won't hurt.....much !!!

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

 

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