Just bought a 2003 yz250f and the entire motor is being rebuilt with all new parts and bored to a 310cc. I'm just wondering about how much hp i will have? any help would be nice.
Depends who made it, you may need to run race fuel, you will definatly need to find out the compression ratio.
MAX Power who make the best big bore's dont make a 310 but a 315 and theirs on race gas is about 40hp so yours will be probably around that number, but if you dont use race gas, probably loose 2-3 hp.
yz310f
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