Quote:

Richard, Before you begin any tear down, verify your valve lash is ok. Listening to your engine if a valve did hit the piston you should hear a misfire and or a popping in the intake or exhaust. In my experience whenever a valve made the slightest contact with a piston, it bent.



Thats why I figured clearance/timing since it seemed to be running OK otherwise. Hard to say for sure though.I doubt the backward piston, was just a thought as to why it could have made contact with a piston if timing and clearance had already been rechecked.

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