This high quality accessory is the compression spring for 125cc Yamaha Scooters from NCY These compression springs will do perform several functions concurrentlyDescription This high quality accessory is the compression spring for 125cc Yamaha Scooters from NCY.These compression springs will do perform several functions concurrently. First of all, they supply the pressure to engage the belt. In addition, the springs determine the rate at which the CVT transmission switches from low to high gear. A 1000 rpm spring will go into a higher gear sooner than a 2000 rpm spring.This NCY rpm compression springs are specifically for the Yamaha Vino 125cc and Zuma 125cc scooters.Let Monster Scooter Parts be your source for NCY scooter parts and accessories. ? WARNING California Residents: Proposition 65 Warning Specifications Wire diameter: 5.0 mm Inner diameter: 54.5 mm Length: 116.0 mm