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Message: [QUOTE="dirt bike dave, post: 1211573, member: 18302"] Maybe his is bored to 310. If you needed to shave it to go from 250 to 265, do you think you could go to 310 without removing it? BTW, his '95 also has a different motor than your '02. I'm just throwing out ideas why someone would remove the powervalve in a dirt bike. Besides accomodating an over bore, the only other thing I can think of is the PV was worn out and busted, and they did want to spend the money to repair properly. The poster said the 'bike seemed to run OK' even with a worn out top end and no PV. Would it run OK in this condition on a stock bore? Maybe not, but it could with a 310 kit. [/QUOTE]