NCY Transmission Power Pack for 125cc – 170i GY6 Scooters, ATVs, and Go Karts INCLUDES: Ultralight gold specially coated overdrive variator NEW UPGRADED Ultralight Aluminum outer drive face Ultralight large shoe racing clutch NEW Ulltralight drilled & vented clutch bell (99 grams lighter than previous NCY Bell) Dual range secondary slider 18×14 10gram, 11gram, and 12 gram roller weights 1500 RPM compression spring Ball bearing compression spring seat This NEW AND IMPROVED Super Trans Kit is one of the best dollar-for-dollar bolt-ons to improve your bike! Quicker acceleration, higher top speeds, and makes your CVT the smoothest operating trans in town! From rapid down shifting to slow cruising, this thing is smooth. Ultralight balanced components, oversized wear pads, and state of the art polytetrafluoroethylene (PTFE) coatings ensure superior performance and long service life. **Recommendations: Use a new belt with this kit. Use graphite or Moly grease when assembling **