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We had user here that would be able to comment on the quality of Chinese replacement parts. I remember him doing cylinder piston replacement. Before you jump on this I would recommend to do full diagnostics. Bad compression could be caused by many things:
- bad head gasket
- incorrect valve lash adjustment
- burned valve
- loose spark plug
- worn piston rings
- worn piston (rind grooves)
- worn cylinder
- crack in the head or cylinder
also less common:
- broken starter clutch - just starter spinning
- broken or leaking compression tester
So check few things before firing parts cannon.
My $.02 on the 300cc mod: Would not do it. Even if you'll end up with well running bike, with acceptable level of vibrations - you'll be putting additional stain on the crank, clutch and trans.
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