NCY Performance Roller Weights 16x13mm 139QMB & GY6 50-80cc
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Fine-tune your scooter's CVT transmission with NCY 16x13mm Roller Weights. Available in 5g through 9g, these precision rollers let you dial in the perfect balance between low-end torque and top-end speed — and replacing worn, flat-spotted rollers restores lost performance and improves fuel efficiency.
Key Features
- Precision Tuning — 5g–9g options to find your CVT sweet spot between acceleration and top speed
- Premium Durability — low-friction polymer sleeve with metal core, ISO 9001 certified, made in Taiwan
- Performance Recovery — eliminates high-rev lag and restores top speed lost to worn factory weights
- Sold as a set
Specifications
- Dimensions: 16mm (diameter) × 13mm (width)
- Available Weights: 5g, 6g, 7g, 8g, 9g
- Material: Low-friction polymer sleeve with metal core
- Origin: Made in Taiwan
Compatibility
Fits a wide range of 50cc–80cc scooters using the 139QMB / GY6 50cc engine platform:
| Brand | Compatible Models |
|---|---|
| Genuine Scooter Co. | Buddy 50, RoughHouse 50, Rattler 50, Black Cat 50 |
| Honda | Ruckus 50, Metropolitan 50 (pre-2011), Elite 50, Dio (AF25, AF27, AF28) |
| Yamaha | Zuma 50 (2-stroke), Vino 50, Jog 50 |
| Chinese / Import | All 139QMB / GY6 50cc–80cc engines (TaoTao, CSC Go, etc.) |
Compatible engine codes: 139QMA, 139QMB, 1P39QMB, 1P39QMA, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, LJ139QMB, 147QMD (GY6 80cc)
Tuning Guide
- Lighter than stock — crisper acceleration, better low-end pull
- Same as stock — restored factory performance
- Heavier than stock — higher top speed with reduced acceleration
Maintenance Tip: Inspect roller weights every 1,000 miles. Flat spots or a drop in top speed are signs it's time for a fresh set.
About NCY
NCY is the premier provider of aftermarket performance components for Honda, Yamaha, Genuine, Vespa, Piaggio, SYM, Lance, KYMCO, and GY6/QMB-powered scooters. ISO 9001 certified and made in Taiwan since 1997.
Shipping information
Orders are prepared as quickly as possible. Delivery times and shipping costs are calculated at checkout based on the destination and items ordered.
Returns & warranty
Please verify fitment and part number before ordering. Contact Thrifty Scooters promptly if an item arrives damaged or incorrect.