NCY Upgear Set 16x38 for GY6 125cc/150cc Engines

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.

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

Compatibility:

157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:

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.

• 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

Brand: NCY | SKU: 1200-1168 | MPN: 658A13VENTO1638 | Ratio: 16x38 (23% upgear) | Stock Ratio: 13x40 | Counter Shaft Teeth: 16 | Final Drive Teeth: 38 | Counter Shaft OD: 31.1mm, Overall L: 60mm | Final Drive OD: 71.2mm, ID: 18mm, W: 20mm | Engine: GY6 125/150/169cc (157QMJ-based) | Tool Required: 12-ton hydraulic press | Origin: Taiwan

GY6 125cc / 150cc / 169cc engines (157QMJ-based) — engine codes: 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A, and all QMJ/QMK/QMI variants. Fits most Chinese GY6 scooters from Wolf, Jonway, Tao Tao, Bintelli, ZNEN, Schwinn, BMS, and many more.