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Secondary Gear Kit NCY 18/46 for GY6 139QMB/QMA
1200-1270
New
NCY QMB139 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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