80cc QMB139 Transmission Gears 17% increase

Jasil Top Racing 18/50 Gear Set for 50cc QMB139 GY50 4-Stroke Engines. +17% Gear Ratio for increased top speedIt is recommended this gear set be used after installing a big bore cylinder kit. A stock engine will not have enough power to make use of a taller gear set.

Made in Portugal! No press required like common tall gear sets, drop in and go!