Yamaha PW50 special transmission gear designed to give PW50s more low end torque. Works awesome for starts & holeshots. Replace the standard OEM gear with this special heavy duty, USA-made Top End Machine brand transmission gear. Uses the same gear ratio as the QT50 transmissions, but this gear is located inside the clutch cover making it easier to change than the older rear end QT50 gears. CNC Machined from Billet. *Since this is a bolt on part, you can always go back to stock if you want to.