Prima 16x13mm CVT Roller Weights | 139QMB Ruckus Buddy 50
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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.
CVT Tuning Guide
Choosing the right weight depends on your riding goals and body weight:
- Lighter Weights (3g–5g): Quicker acceleration, better hill climbing, ideal for heavier riders. May slightly reduce top-end speed.
- Mid-Range Weights (6g–8g): Balanced daily commuting — closest to stock feel for most 50cc scooters.
- Heavier Weights (9g–11g): Higher top-end speed on flat roads, best for lighter riders. Acceleration will be more gradual.
Technical Specifications
- Diameter: 16mm
- Width: 13mm
- Quantity: 6 weights per pack
- Compatibility: Standard variators requiring 16x13mm rollers
Compatibility
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):
- Buddy 50 / International: Stock 7.5g–8.5g
- RoughHouse 50 / Sport / Titanium: Stock 7.5g–8.5g
- Rattler 50: Stock 11.5g
- Black Cat 50: Stock 7.5g–8.5g
Honda & Yamaha (4-Stroke):
- Honda Ruckus (NPS50): All years
- Honda Metropolitan (CHF50): 2002–2012
- Yamaha C3 (XF50): 2007–2011
- Yamaha Vino 50: 4-stroke models
- Yamaha Zuma 50F / 50FX: 4-stroke models (2012+)
Chinese & Taiwanese 50cc (GY6 50 / 139QMB):
- Chicago Scooter Co. Go. 50, Go. Max 50
- Wolf Brand Scooters: RX-50, Islander, Lucky, Blaze, MOTO
- TaoTao / Tao Motors: ATM50-A1, Pony, VIP, Thunder
- Lance / SYM: Cali Classic 50, PCH 50, Cabo 50
- Kymco: Agility 50, Super 8 50 (4-stroke)
- Bintelli / Ice Bear: Breeze, Havoc, Maddog 50, PMZ50
Engine Code Compatibility
Don’t see your model? If your engine tag contains any of the following codes, these 16x13mm weights are compatible:
| 139QMA | 139QMB | 1P39QMB | 1P39QMA-2 |
|---|---|---|---|
| YN139QMB | JJ1P39QMB | 139FMA-2 | BD1P39QMB |
| BN139QMB | 147QMD | Other 50cc QMA models | Other 50cc QMB models |
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