GY6 GY7 Performance Up-Gear Kit 14*36/37/38

Performance Up-Gear Kit for GY6 and GY7 Engines

This performance up-gear kit is designed for GY6 and GY7 engines, allowing you to adjust the final drive ratio easily. It features a 14-tooth counter shaft gear and includes options for 36, 37, or 38 driven gear teeth. This versatility helps you optimize your scooter’s performance, balancing top speed and acceleration. It is one of the GY6 scooter parts that can significantly improve your riding experience.

Gear Ratio Selection

Swapping out the driven gear changes the final drive ratio, affecting how power is transmitted. The standard GY6 150cc setup typically uses a 14-tooth counter gear with a 40-tooth driven gear. Choosing a 36-tooth gear will provide higher top speed but at the cost of low-end torque. The 37-tooth gear offers a balanced upgrade, while the 38-tooth gear maintains a ratio close to the original with a minor increase in top speed.

Compatibility and Fitment

This up-gear kit is compatible with both the 54mm stud spacing and the 57mm stud spacing GY6 engine families. It fits a variety of models and engine codes, making it a versatile choice for many scooter enthusiasts. If your engine code includes "QM" or "FM", it is likely compatible.

Specifications

• Counter Shaft Teeth: 14
• Driven Gear Options: 36T, 37T, 38T
• A-Block Fitment: 54mm stud spacing
• B-Block Fitment: 57mm stud spacing
• Origin: Made in Taiwan (ISO 9001 certified)

Fitment

This gear kit is suitable for GY6 157QMJ-based engines, including 125cc, 150cc, and 169cc models.

• 157QMJ
• 161QMK
• 152QMI
• 1P61QMK
• YN1P57QMJ
• 1P52FMI
• 154FMI
• JJ157QMJ
• 1P57QMJ
• BN157QMJ
• BN161QMK-A
• Other QMJ / QMK / QMI

Not sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.

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