![NCY Compression Spring (1000RPM) Most Minarelli,Yamaha 50 2T](http://primoscootercompany.com/cdn/shop/products/image_ceb3a85c-a12b-4965-992a-fe18e70ee9c0_{width}x.jpg?v=1629675129)
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 will fit:
Yamaha Zuma 2t 50cc
Most Minarelli applications