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Doppler Primary Gears for ZUMA

Doppler Primary Transmission  Yamaha ZUMA.

Taller gears reduce the overall gear ratio of your transmission and will result in improved acceleration, a higher gear ratio increases top end speed. OEM engines usually don't have enough power to pull this kind of transmission, so you will need a sports or racing cylinder.

Get rid of your old gear, grab this Doppler transmission kit


  • primary transmission: 15/50 OR 14-42
  • mount: press-fitting