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Honda CB750K5 Restoration by Royhall
royhall:
Had a few guys email me about people who can repair the cases, many thanks for that. I do have a local guy who's successfully repaired them in the past for me. Usually it just knocks a lump out of the upper case, but this one is a heavy smash with cracks radiating out like a spiders web. The cracks run as far as the output shaft seal and involve both upper and lower cases. With the amount of welding required it is unlikely that the cases won't distort. I have decided to go with James's spare engine and part out the bits I don't need to help a bit with the cost. But the suggestions are most welcome.
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Laverda Dave:
That's good news Roy and sounds like a plan is forming. Looking forward to seeing the photos of the actual damage as it will likely help others when looking for a 750 and the pitfalls involved.
Did the seller state the cases were damaged or was it just a case of 'Here's a barn find, non-runner, unchecked etc'?
Good to hear this won't be one of those projects that stalls at the first hurdle, good luck with it and the rebuild thread will be a good read.
Trigger:
--- Quote from: royhall on February 01, 2022, 09:36:46 AM ---Had a few guys email me about people who can repair the cases, many thanks for that. I do have a local guy who's successfully repaired them in the past for me. Usually it just knocks a lump out of the upper case, but this one is a heavy smash with cracks radiating out like a spiders web. The cracks run as far as the output shaft seal and involve both upper and lower cases. With the amount of welding required it is unlikely that the cases won't distort. I have decided to go with James's spare engine and part out the bits I don't need to help a bit with the cost. But the suggestions are most welcome.
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--- End quote ---
To repair that much damage you have to bolt the cases down to a 28mm thick plate and do a little welding at a time, letting it cool down for an hour at a time. The last one i repaired that had a hole the size of my fist, took quite a few days. :o
royhall:
That's what we did last time and it worked out okay. This time I think I really need to change the casings as there are literally cracks everywhere and they are running into seal and bearing surfaces. As James has the bits available I may as well take the safest route. The guy must have been going for it when the chain snapped as it went with a real bang.
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royhall:
--- Quote from: Laverda Dave on February 01, 2022, 09:57:40 AM ---That's good news Roy and sounds like a plan is forming. Looking forward to seeing the photos of the actual damage as it will likely help others when looking for a 750 and the pitfalls involved.
Did the seller state the cases were damaged or was it just a case of 'Here's a barn find, non-runner, unchecked etc'?
Good to hear this won't be one of those projects that stalls at the first hurdle, good luck with it and the rebuild thread will be a good read.
--- End quote ---
Thanks Dave. I actually asked the seller if he knew of a chain break as the chain was missing and the engine looked half out. But he said he didn't know and couldn't see without dismantling so I took a chance knowing it may be 50/50. Guess I just lost, but with James's parts were back on track. And don't forget it was dirt cheap.
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