NCY Gear Set (17*41); 139QMB, CSC, Wolf, 50cc polini performance variator kit Stock crank case replacement

Stock crank case replacement

see the compatibility table below to ensure this works with your bike

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5" W x 4" H

NCY Gear Set (17*41); 139QMB, CSC, Wolf, 50cc polini performance variator kit Stock crank case replacementNCY 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.