G- Final Drive Gear 51 (139QMB shortcase)
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 speed. Meanwhile, a higher ratio will result in the opposite, i.e. more torque at the wheels but lower top speed. Get the most out of your big bore kit, with increased top speed and a more usable rev range performance with the final drive gear change.
NOTE: Not included, must reuse stock 52-teeth counter shaft gear or purchase Part# 1100-1322.
Include the following Final drive gear.
• 1x Rear Final Drive Gear Teeth: 51 / Inner Spline: 19
• OD: 80.9mm / ID: 18mm / W: 15.7mm
• Made in Taiwan
• Fit QMB 49/50cc (shortcase)
Supported Models: GY6 50; 139QMB 49/50cc engines, Genuine Buddy 50, Genuine RoughHouse 50, Kymco Filly 50, QLink, SYM 50, TaoTao 50, and virtually any scooter engine with these measurements.-----
Item Weight & Product Dimensions:
• 0.7 pound | 3.18" (OD) x 0.708" (W) x 0.618" (H)