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Jasil 3-piece primary gear up kit for scooters using a Chinese GY6 50cc engine (139QMA/B)
This pre-press kit makes it easy to fit as no heavy duty press is required. As any gear up this will increase your final gearing making the top speed greater and stop over revving.
Choose from either 17/51(+8%) or 18/50(+17%) % increase is where standard is 16/52.
*Made in Portugal.
Jasil 6012390, 6012391
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