RDLN High-Speed Gear Set (17/49) – GY6 50cc / 139QMB Parts for Scooters Engine type: Single Cylinder 4-Stroke

Engine type: Single Cylinder 4-Stroke

Bore: 40mm (stock 50cc)

we've got you covered with rings and pistons

Tech Tip: For the best fit

The main bearings are installed

RDLN High-Speed Gear Set (17/49) – GY6 50cc / 139QMB Parts for Scooters Engine type: Single Cylinder 4-StrokeUnlock Top End Speed: RDLN 17 49 Performance Gear Set Is your 50cc100cc 139QMB engine revving at its limit without providing a higher top speed? The RDLN Performance Gear Set (17 49) is engineered to change your final drive ratio, allowing your engine to push the bike faster at lower RPMs. Depending on your current engine modifications and rider weight, this gear set can net an increase of up to 7+ MPH in top end velocity. Performance & Engineering