NIBBI 125CC GY6 Short Case Transmission Kit With 743 Belt Pulley Set With 15g Roller Drive Face Clutch Clutch Housing 2000RPM Torque Spring 2000RPM Clutch Spring For GY6 Engine Scooter This Super Variator Kit is the better choice to improve your Motorbike! Quicker accelerate, higher speed and makes your motorcycle operating smoothly in the road From rapid shifting to slow smoothly. Ultralight balanced components, oversized wear pads, superior performance and long service life.