Upgear Kit 16x42 - 50cc (139QMB) GY6 50cc Scooters

16x42 Gear Kit for 139QMB GY6 50cc Scooters

This 16x42 gear set is built for 139QMB (GY6 50cc) 4-stroke engines. Fitting it raises the final drive ratio by roughly 24%, which can lift top speed and widen the usable rev range. It suits big-bore engine builds in particular. Browse other GY6 50cc scooter parts if you want to complete your setup.

Performance Gains

The 16-tooth countershaft piece and the 42-tooth final piece together create a taller gear ratio than stock. The change matters most on modified engines, where riders can reach higher speeds and gain some acceleration. On a stock setup, the difference is small.

Build Quality

These gears are made from machined steel for strength and durability. The solid build is meant to cope with the extra load from a more powerful engine while still holding up over time. The kit is designed to install easily into an existing engine.

Specifications

• Gear Ratio: 16x42
• Material: Machined Steel
• Fits: Any 139QMB / GY6 50cc 4-stroke scooter, including CSC, Wolf, Peace Sports, Tao Tao, Icebear, Jonway

Compatibility

Compatible with:

• Any 139QMB / GY6 50cc 4-stroke scooter (based on engine type)
• CSC scooters (GY6 50cc 4-stroke)
• Wolf scooters (GY6 50cc 4-stroke)
• Peace Sports scooters (GY6 50cc 4-stroke)
• Tao Tao scooters (GY6 50cc 4-stroke)
• Icebear scooters (GY6 50cc 4-stroke)
• Jonway scooters (GY6 50cc 4-stroke)
• Bintelli scooters (GY6 50cc 4-stroke)
• BMS scooters (GY6 50cc 4-stroke)
• SSR Motorsports scooters (GY6 50cc 4-stroke)
• SunL scooters (GY6 50cc 4-stroke)

How to choose: Only use this kit on a 139QMB / GY6 50cc 4-stroke engine, since that is the engine it is made for.

Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Parts