Dr. Pulley 16×13 Sliding Roller Weights for 50cc 4-stroke QMB139 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 Movable Drive Pulley (MDF). Now the innovative Dr. Pulley Sliding Roller Weights slide up-and-down the ramp to change the gear ratio. This …
Dr. Pulley 18×14 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 …
Dr. Pulley 16×13 Round Roller Weights for 50cc 4-stroke QMB139 engines. Please select weight from drop-down menu. Dr. Pulley Round Roller Weights have exceptional durability, heat resistance and are low friction and low wear.Please see our Warranty & Returns Policy. Size: 16×13 Set of 6 Lasts longer than standard roller weights Excellent Heat Resistance Low Friction / Low …
Dr. Pulley 15×12 Sliding Roller Weights for Minarelli 50cc 2-stroke engines. 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 …
Expect better performance from your scooter, period. No matter what stage you are in upgrading your scooter, simply add Dr. Pulley weights and a kevlar belt for a power upgrade. Dr. Pulley roller weights are the most advanced weights available. These sliding rollers perform better than standard round weights by allowing the variator to open farther for higher …