SOHC.co.uk Forums > CB750

smashed cases

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SamCR750:
I think back then Dennis, we all thought they would last for ever without lubricant ;D

Aintree is back on this year if you're up for it, have been offered a ride on a 836 750F, might bring one of my old Benlys as well, would be good to see you again.

Sam. ;)

Spitfire:
Hi Sam, yes could do with a day out, when is it ?

Cheers

Den

SamCR750:
I think It's in July Dennis, will let you know.

Sam. ;)

Spitfire:
Thanks Sam.

K2-K6:
To repair the cases seems the right way to go as eventually they are going to be short supply.

I would empty and degrease them then push the broken bit back in from the inside and tack-weld it on the inside, then bolt the two halves together to help against distortion, keep the cases warm and weld from the outside to re-instate the casting and let if coooool slooooowly.

Don't be tempted to grind off the weld if it clears everthing, just leave it as a good quality fillet.

Chains rarely break if looked after and lubricated, it's usually too worn wich is another issue in that the chain pitch gets too long to fit the sprocket and on throttle closed overun the slack transfers from the bottom run to the top and tries to wrap round the drive sprocket punching a hole in the casting.

Iv'e seen all sorts of junk used including industrial chains which are not usually tolerant of high speed and wear really quickly when used on a bike.

If you try to pull a good condition chain away from the rear sprocket it's almost impossible as the pitch is a close match to the teeth (just try it you'll see), If you can to any degree it's knackered with a capital F.

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