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Discussion Starter · #1 ·
Decided to crack my engine open on my 1970 cb350 twin after a few oil leaks led me to needing to replace gaskets. The right side of the engine always had a problem firing, and now looking at the pistons, i'm curious if there has been too much damage done. I've newby on all of this, so suggestions would be greatly appreciate! Basically, do they look toast, or would it be worth replacing them? (see photo below)

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· Premium Member
10,166 Posts
Take the pistons and the cylinders to a machinist to be measured and evaluated (posting pictures here could also help). It could be that all you need to do is hone the cylinders and install new rings.

You also need to evaluate the valves/guides.

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