Low Compression - Help

Alex Yampolskiy /
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So all of a sudden my Puch wouldn't start and after doing all the tests (fuel, spark, compression) I found out that it has very low compression and wouldn't turn over.

I replaced the piston rings and gaskets, however it didn't help and the compression is below 20psi. It did start once when I was pedaling really fast and "dropped" the clutch.

Am I missing something? Is it due for a full rebuild? When I replaced the rings, I did NOT hone the cylinder. Not sure if that's an issue as well.

Really appreciate any help.

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