GY6 Gear Set (16*37)

16*37 Gear Set for GY6 125cc / 150cc Engines

This 16*37 gear set is built to raise the performance of a GY6 125cc or 150cc engine. It takes the place of the factory 13*40 gear set and delivers a 25% gain in gear ratio. It is one of the GY6 scooter parts that can noticeably boost top speed and help your engine work across a better rev range.

Performance Advantages

Fitting this gear set gives quicker acceleration and a more efficient power delivery. It suits riders who want to get the most from their engine. It is especially well matched to setups running a big bore kit, where it helps the scooter feel stronger across a wider span of speeds.

Fitting Guidance

Mounting this gear set calls for a 12-ton hydraulic press to remove the original counter shaft gear and press the new one into place. Using the correct tools makes sure the gear seats securely and runs properly. Follow all standard safety practices whenever you work on engine components.

Specifications

• Front Counter Shaft Teeth: 16
• Rear Final Drive Gear Teeth: 37
• Inner Spline: 19
• Outer Diameter: 69mm
• Inner Diameter: 18mm
• Width: 19.6mm
• Fits: GY6 150cc (157QMJ) engines and 157QMJ-based 125cc/150cc/169cc engines

Fitment

Fits:

• GY6 150cc (157QMJ)
• 157QMJ-based 125cc / 150cc / 169cc engines (codes incl. 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A; other QMJ, QMK, QMI codes)

How to choose: Pick this set for a GY6 engine whose code contains "QM" or "FM". It is a 16*37 upgear set, roughly 25% higher in ratio than the stock 13*40.

Where it goes: part #17 on the transmission diagram for the GY6 150cc (157QMJ).

Other versions: For a GY6 150cc 15*37 gear set with different counter shaft gear teeth, see GY6 150cc Gear Set (15*37). For a GY6 150cc 16*36 gear set with different final drive gear teeth, see GY6 150cc Gear Set (16*36).

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