Selecting optimal roller weights for your personal preference will deliver the most cost-effective performance upgrade you can make to a CVT scooter. The Prima 16x13mm Roller Weight Set (6 per pack) is precision-manufactured to exact tolerances for smooth, consistent shifting and long-term durability in high-heat CVT environments. Whether you want snappier off-the-line pull or a higher top-end cruise, swapping rollers gets you there without touching the carb or exhaust.
Choosing the right weight depends on your riding goals and body weight:
Direct replacement for 49cc�80cc 4-stroke (139QMB / GY6 50) engines and premium 50cc models from Genuine, Honda, and Yamaha.
Genuine Scooter Co. (2-Stroke):
Honda & Yamaha (4-Stroke):
Chinese & Taiwanese 50cc (GY6 50 / 139QMB):
Don�t see your model? If your engine tag contains any of the following codes, these 16x13mm weights are compatible:
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