Description
Extract more top speed and a wider, more usable rev range from your GY6 big bore build with the NCY 16x38 upgear set. This kit is a 23% upgear over the stock 13x40 gear set, shifting the power band for improved high-speed performance. Includes countershaft gear (16T) and final drive gear (38T). Compatible with 157QMJ-based 125cc, 150cc, and 169cc engines across most Chinese GY6 scooters.
NOTE: A 12-ton hydraulic press is required to remove the stock counter shaft gear and press the new NCY gear onto the counter shaft. Professional installation is strongly recommended.
Features
- 23% upgear over stock 13x40 ratio — increases top speed and extends rev range
- 16-tooth counter shaft gear + 38-tooth final drive gear included
- Ideal companion for GY6 big bore kits (150cc, 169cc, and larger)
- Fits 157QMJ-based 125cc/150cc/169cc engines and all QMJ/QMI/QMK variants
- Requires 12-ton hydraulic press for counter shaft gear removal and installation
- ISO 9001 certified | Made in Taiwan by NCY
Specifications
- Brand: NCY
- SKU: 1200-1168 | MPN: 658A13VENTO1638
- Ratio: 16x38 (23% upgear over stock 13x40)
- Front Counter Shaft Teeth: 16
- Counter Shaft Dimensions: Spline L: 24mm, OD: 31.1mm, Overall L: 60mm
- Gear Press-On Area: L 12.08mm x OD 19.08mm; Ends L: 9–10.5mm x OD: 15mm
- Rear Final Drive Gear Teeth: 38
- Final Drive Gear: Inner Spline: 19, OD: 71.2mm, ID: 18mm, W: 20mm
- Made in Taiwan
Model Fitment
157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:
| 157QMJ |
161QMK |
152QMI |
1P61QMK |
| YN1P57QMJ |
1P52FMI |
154FMI |
JJ157QMJ |
| 1P57QMJ |
BN157QMJ |
BN161QMK-A |
Other QMJ, QMK, and QMI models |
Don't see your engine listed? If the engine code includes "QM" or "FM" and is 125cc–200cc, this product is likely compatible with your vehicle.
Off-Road Use Only. This product is not intended for use on public roads. Not legal for use in California on pollution-controlled vehicles. Check local laws before installing. Performance upgrades are considered racing parts and are not covered under warranty.
Product Diagrams
