Dr. Pulley 18x14 Round Roller Weights for 125/150cc 4-stroke GY6 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.

Heavier roller weights= A slower take off speed with more acceleration and a higher top speed. 
Lighter roller weights = A faster take off speed with less acceleration and lower top speed.