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Secondary Gear Kit NCY 17/41 for GY6 139QMB/QMA
1200-1271
New
NCY QMB139 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 qmb139 scoots. Only effective if you have a full blown 88cc kit with a big valve head, and stroker crank.
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