Cylinder Gouged

[LOUD MOUSE]

Look at the dome of each piston.
You will see that the C77 doesn't have a machined top edge and will have more compression than the CB77.
My experience with CHEAP engine rebuilds is that more often than not you will get to go back in there and do it mechanically correct.
You already need to get one piston. ..............lm

uote="P.Martinez"]The broken sparkplug electrode (if that was indeed what it was), somehow got past the top ring and got trapped between comp. rings #1 & #2. So yes, the gouge is past the top ring. There are scrape marks along the length of the cylinder, but not as deep. I would estimate at about .003". Also, whoever made the repair used a piston that does not match the original. One piston is marked "CB77" and the replaced piston is marked "C77". The "C77" piston weighs 10 grams less than the other, probably not a good thing!
Phil M.[/quote]