A must do on the 250x is, send the head to Ron Hamp and get the squish corrected. These bikes get horrible fuel mileage (30 miles per tank). My buddy has one and we tried everything to make it better and nothing worked until he corrected the squish. It was 1.9mm from the factory. When Yamaha tried to take the hit out of the motor they just put a thicker base gasket under the cylinder to lower compression and change port timing. When they did this it made the squish clearance terrible. Other than that the only complaint with the 250x is build quality, Yamaha really needs to bring the yz up to date. Phillips head screws in the stator cover, cheap captured nuts in the plastic that spins, cable clutch, the bike just feels very 2005.
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