i had my engine apart to change the gaskets and while i was at it i measured my piston because i was told by the old owner it was bored out to 300cc. it measuers out to 2 5/8 inches witch is almost 67 mm. stock is 47 mm i believe. so that makes it almost 20mm over. how much power did it gain? i dont know a whole lot about how many hp is in a certin amount of cc.


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