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.
Fits the following: Vino 125 Zuma 125 / BW's 125
NCY Compression Spring (1000 RPM) Vino125,Zuma125
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