MYK Chinese Scooter High Performance Racing Torque and Clutch Shoe Springs Set GY6 50cc-100cc also fits 139QMB and 1P39QMB Engines Scooter Moped ATV 1500RPM Yellow

Performance 1500 RPM Torque Spring for 50cc QMB139 4-stroke engine based vehicles. Designed to provide varying pressure to the sliding variator plate for different acceleration purposes and tuning. When performance increases, these springs become a necessity. It can maximize your engine's torque and response. These top performing springs will give you back your acceleration, hill climbing ability and make your machine run as a top performer once again. This fits all the common scooters, ATV , Go Karts with 50cc QMB139 engines like Tao Tao , Baccio , Vento Phantom R4i, R3, Jonway, NST, Tank, JMstar, Roketa, Sunl, Peace and many more.