Bolaxin 10 Teeth Electric Starter Motor for GY6 50cc Scooter Moped Parts Electric Starter Motor without Wire for 50cc 4-stroke QMB139 engines. Fits most Chinese made GY6 based 50cc scooters. Bolt Hole Spacing: 70mm ,Please measure before ordering. Total Diameter of Shaft: 7.25mm, 10 Splines Fast shipping via USPS/DHL with VALID tracking code by Bolaxin ,shorter delivery ,cheaper price with great quality .