Hello. Could someone help me. I have got a mountain bike with a shift kit that never worked properly. Either the chain connecting the motor to the crank would pop off or the chain going from the crank to the the rear hub would pop off and jam everything up. I have tried everything to get this to work. I had everything the way it was supposed to be but finally gave up on having it there way because it just would not work. If anyone can be of assistance it would be greatly appreciated.