NCY
NCY Upgear Kit 16x42 - 139QMB GY6 50cc Scooters
Description
NCY 16x42 upgear kit for 139QMB (GY6 50cc) 4-stroke engines. Increases the final drive gear ratio by approximately 24%, raising top speed and broadening the usable rev range. Designed for big-bore builds — minimal benefit on a stock top end.
Includes 16-tooth countershaft gear and 42-tooth final drive gear.
Key Features
- 16x42 gear ratio — ~24% taller than stock
- Increases top speed and usable rev range
- Designed for big-bore 50cc builds
- NCY-branded machined steel gears
- Fits QMB139 / GY6 50cc 4-stroke engines
Specifications
| Countershaft Gear | 16 teeth |
|---|---|
| Final Drive Gear | 42 teeth |
| Ratio Change | ~24% taller than stock |
| Engine | QMB139 / GY6 50cc 4-stroke |
| Brand | NCY |
Fitment
Fits any 139QMB / GY6 50cc 4-stroke scooter. Compatible with most Chinese-manufactured 50cc scooters, including CSC, Wolf, Peace Sports, Tao Tao, Icebear, Jonway, Bintelli, BMS, SSR Motorsports, SunL, and many more.
Performance part — not for use on pollution-controlled vehicles or public roads. Check local laws before installing.
Product Diagrams
Features
Specifications
Countershaft: 16T | Final Drive: 42T | Ratio Change: ~24% taller | Engine: QMB139/GY6 50cc 4-stroke | Brand: NCY | SKU: 1200-1269
Model Fitments
Any QMB139/GY6 50cc 4-stroke scooter. Compatible with most Chinese-manufactured 50cc scooters including CSC, Wolf, Peace Sports, Tao Tao, Icebear, Jonway, Bintelli, BMS, SSR Motorsports, SunL, and many more.
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
