2Fast Passion 100cc (4)

This is the set of bearings (polymer cage) and oil seals from Doppler. Manufactured by SKF, they are of impeccable quality. This kit is designed for Minarelli crankcases. Here is...

A higher gear ratio will increase top speed. Only recommended for race tuning cylinders. Stock cylinders generally do not have enough power to pull this type of transmission. A higher...

A higher gear ratio will increase top speed. Only recommended for stroke adjustment cylinders. Stock cylinders usually don't have enough power to pull this type of transmission.

Doppler 14/41 Secondary Gears (BWS 1988-2001), Nitro, Ovetto and Booster. Taller gears reduce the overall gear ratio of your transmission and will result in improved acceleration, a higher gear ratio...