motor138Buy Mid Drive Motor Kit Electric Bike Conversion QS-MOTOR138 4000W 90H 7500W Max Continuous 72V 120KPH Mid Drive Motor Conversion Kit With Wire Harness EM200-2SPIt's QS138 70H V3 Mid Drive Motor Kits, with Votol EM 150 2 controller, suitable for lht electric motorcycle, electric dirt bike, electric dirt bike for adults.