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Double tube
Performance Advantages
Main Jet: #106
Part Number: 1100-1486
NCY Gear Set (18*46); 139QMB, CSC, Wolf, 50cc CB Double tubeNCY 139QMB upgear kit for your 50cc 4 strokes is finally here! This kit is made specifically for larger big bored engines and increases your gear ratio by 26%. This will allow you to maximize your big bore kit by increased top speed and a more usable rev range. You won't see much if any improved performance if you install these on a stock top end. For experienced tuners only.
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