motor138Flexible and Powerful: The Ultimate Motorized Pulley for Medium-Lht Loads. Drive for medium-lht loads and with steel gearbox. This motorized pulley is a flexible component because ofThis is E&C's Favorite Motor! It can be found in both the EMX14 and EMX17 Kits. This motor is perfect for medium size electric motorcycles. The QS138 70H is well known around the world