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how can you tell if a bike has a big bore kit?

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ive got an 02 yz250f used last fall and never asked the guy what all he had done to the motor all he said is that he put redid some of the valves in and got the bike from a racer in Indiana. I am curious to find out if the motor is bored out, any answers of how to find out how to check would be greatly appreciated, thanks

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