SOHC.co.uk Forums > CB750

CB750 tear down.

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Johnny4428:
Yes you can see by the profile of the lobes it is worn. The followers didn’t appear to be bad to the untrained eye.

Nurse Julie:
Johnny, what number has that cam got on it? The number will be near where the sprocket goes.

Johnny4428:
It’s an R8 Julie.

Johnny4428:
I have no evidence to suggest this engine had been dismantled by previous owner other than the fact that there was one oil restrictor missing! There is minimal wear other than the camshaft lobes. Crankshaft is good main bearings big ends and small ends good, pistons and rings good. Scars on one or two of the mains so will replace them as well as primary and camshaft chains, tensioner etc. Maybe wounds from when the drive chain decided to break into the crankcase. The pistons are standard size Honda stamped, but why would somebody decide they were in the wrong way round? Bores very good no scores and no lip. So the stupid question is did the restrictor missing impact on the delivery of oil to the camshaft or did it deprive delivery elsewhere with the reduction in pressure?

philward:
An oil restrictor missing would severely reduce oil presure to that side and cause damage quite quickly I would suggest. Also, you say pistons in wrong way round but not been stripped previously? Or do you mean not stripped by last owner?

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