my puch seems to run fine at normal speeds, but at high speeds (like when i am going downhill) it sounds and feels like there is alot of friction somewhere in the motor. when i go downhill with the motor running, but no throttle, it still feels like something is going to break.
but when i coast downhill (at same speed) with the motor off, it feels fine--no unusual friction.
does anyone have any idea what the problem might be? or is this normal?