Search

Description: Final Drive Gear 51 Teeth direct stock replacement for 139QMB 49/50cc 4-stroke shortcase engines. The final drive ratio is the last bit of gearing between your transmission and the driven wheels. In general, a lower final drive ratio will lead to less torque at the wheels but higher top..

Description: Final Drive Gear 52 Teeth direct stock replacement for 139QMB 49/50cc 4-stroke longcase engines. The final drive ratio is the last bit of gearing between your transmission and the driven wheels. In general, a lower final drive ratio will lead to less torque at the wheels but higher top ..