do any of you guys think your bikes seem a little slow at top speed? my 02 cr 125 seems like its not really going that fast but the motor is screaming. i think it might be from my chain and sprockets after i put a new ones on. (new one is a PT 520 gold) so it might be a little slower because of a heavier chain? i dont know i just noticed it recently, but my motor is fresh and healthy.