NCY Gear Set (17*41); 139QMB, CSC, Wolf, 50cc polini performance variator kit producing over 25 million tires

producing over 25 million tires annually under ISO 9001 certified quality standards

5" W x 4" H

Includes extended throttle cable

Vee Rubber has been producing high-quality tires since 1977 — delivering durability and value without compromise

This kit is a direct performance upgrade for 50cc and 80cc (139QMB/GY6) engines:

NCY Gear Set (17*41); 139QMB, CSC, Wolf, 50cc polini performance variator kit producing over 25 million tiresNCY 139QMB upgear kit for your 50cc 4 strokes is finally here! This kit is made specifically for 88cc big bored engines and increases your gear ratio by 30%. This is the mother of all upgears for the 50cc 139QMB scoots. Only effective if you have a full blown 88cc kit with a big valve head, and stroker crank.