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Could be, could be.
The thing is, it ran fine one moment, and not at all the next. Would stuck, broken or worn-out rings act like that? I can see it if I got the bike and it wasn't making compression when I got it. But not with it running as good as it had been for me up to that point.
I'm faced with a minor dilemma, though. I wasn't planning to pull the cylinder off at this point (no base gasket, etc). Looking at the cylinder walls shows virtually no wear. The motor has less than 25 hours on it, total. If I don't pull the cylinder off, and the valve lapping doesn't cure the issue, then I'm out a head gasket and the time to go back into it. Sigh.
I'll see what happens after cleaning and lapping the valves. Maybe I'll put it back together temporarily with the old head gasket just to check the compression after lapping.
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