NCY Torque Spring for Yamaha Zuma 125 COMPATIBILITY: Vino 125 Zuma 125 Compression springs do a couple of things. First they supply the pressure to engage the belt. They also determine the rate at which the CVT transmission changes from low to high gear. A 1000rpm spring will go into a higher gear sooner than a 2000rpm spring. This NCY 1000 rpm compression spring is specifically for the Yamaha 125’s. **NOTE: Electrical, High Performance, Aftermarket items are non-returnable, please check photos and specifications before ordering. Please see our Warranty and Returns Policy