This Super Trans Kit is one of the best dollar-for-dollar bolt-ons to improve your bike! Quicker accelleration, higher top speeds, and makes your CVT the smoothest operating trans around! From rapid down shifting to slow cruising, this thing is smooooth. Ultralight balanced components, oversized wear pads, and state of the art Teflon coatings ensure superior performance and long service life. Kit includes: Ultralight gold teflon coated overdrive variator Ultralight outer drive face Ultralight large shoe racing clutch Ulltraight drilled & vented clutch bell Dual range secondary slider 3 sets of roller weights (10g, 11g, and 12g) 1500 RPM Compression spring Ball bearing compression spring seat Brand: NCY Fits: fits Yamaha 125 fits Yamaha Zuma 125 fits Yamaha Vino 125