Dr. Pulley 20x12 Sliding Roller Weights Engines and Engine parts These engines are commonly found

These engines are commonly found on imported Cag/Daytona pocket bikes

2-stroke (Minarelli 47mm) engines

Fan Cover for 50cc 2-stroke 1DE41QMB engines

Set of 2 caster board wheels with bearings for the Razor Original Ripsik (Ripstik Classic)

Complete OEM Front Wheel Assembly for Schwinn

Dr. Pulley 20x12 Sliding Roller Weights Engines and Engine parts These engines are commonly foundDr. Pulley 20x12 Sliding Roller Weights for the Linhai 260 300, Yamaha Morphous 250, Yamaha Vino 125, Yamaha Zuma 125 and many more. Please select weight from drop down menu. Traditionally, gear ratio is changed by the up and down rolling movement of the roller weights in the ramp of the Moveable Drive Pulley (MDF). Now the innovative Dr. Pulley Sliding Roller Weights slide up and down the ramp to change the gear ratio. This unique sliding movement