Stage 6 14/42 up gears for the Yamaha Zuma 50

Stage6 Primary Transmission 14/42 - 13 MBK Booster Yamaha Zuma.

Taller gears reduce the overall gear ratio of your transmission and will result in improved top end speed.

One of the best features of the Stage6 transmissions is that they come pre-pressed with a 13 tooth gear and eliminate the need of a hydraulic press.

OEM engines don't have enough power to pull these gears, so you will need a sports or racing cylinder.

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