I just rebuilt the crank in a 09 kx450f, never run before while i had it. I rode it around (on street) and it felt kind of funny. Vibrated a little bit, sometimes it felt like the tranny. It kind of hestitated when giving it throttle, and it didnt seem as fast as i thought coming off a kx250f. Anything i need to know about these or why these problems are occuring, is it normal? TIres are brand new so that could be causing vibration? Any help is much appreciated. Thanks.