Unexpected loss of propulsion? So the bike just cuts out at highway speeds? I know nothing about electric motors but if there's no clutch to disengage things does that mean the rear wheel locks when the motor stops?
Happened to me a couple of times too. First time , the chain jumped off the back sprocket ( I knew the chain needed replacing but didnt have the funds) and locked up the back wheel. Second time the cam chain snapped and wrapped around the crank.
Ouch, cam chain snapping is unusual, no recovering from that, what bike ?
It was a Honda VF 750.