LOL....that ain't surprising either. I fixed 3 brand new scooter GY6's a while back, all the same brand, they "knocked" when the owners first tried to start them, then had no compression.
The pistons were in upside down, so the incorrect valve releifs lined up with the valves, and NONE of the valves had any clearance....ell zippo, nada, nyet.... so when they rolled over the first time, each engine bent the intake valve. 3 in a row.....now that's QA, huh? But I fixed 'em, and the dealer replaced my stock of intake valves and head gaskets, the owners all merrily road away.....
Chinese scooters and engines, a never ending adventure.LMAO! Did I mention the one that came through with no rings...
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