Dr. Pulley 18x14 Sliding Roller Weights Frame Parts E40QMB and is one of

E40QMB and is one of the most widely used 50cc 2-stroke motors in the world

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Dr. Pulley 18x14 Sliding Roller Weights Frame Parts E40QMB and is one ofDr. Pulley 18x14 Sliding Roller Weights for 125 150cc 4 stroke GY6 engines. 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 (not rolling) provides exclusive advantages to increase CVT