SOHC.co.uk Forums > CB500/550

CB550/4K engine strip, Bore scratch

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McCabe-Thiele (Ted):
As has been said if it's 1mm deep then it's a problem.

I would look for a replacement block, Bryan sourced one for me last year that was spot on. Plus as you know he does rebores as well. He might have a piston kit.

SteveW:
Couldn’t you just replace the liner?

Gary400/4:
Many thanks for the responses, I especially like the comment by JohnWebly, about 2 stroke rings not snagging on ports.the new rings placed in the bores have an end gap of 0.279mm which is between 0.15 - 0.35mm standard ring gap. This means the bores are well within service. Given the scratch dilemma, I would prefer the replacement liner option. Does anyone know where I could obtain a standard liner with a bore of 58.5 mm?

Gary400/4:
Hi everyone I have posted a picture of the scratch in the bore, I am still in two minds about using the cylinder?

Bryanj:
No pic seen here

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