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 2000 rpm compression spring is specifically for the Yamaha Vino 125 & Zuma125 / BW's125.
NCY Compression Spring (2000 RPM) Vino125,Zuma125
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