A reinforced gearbox cover is already worthwhile with smaller tuning stages starting from 70ccm. The original Minarelli gearbox cover has the disadvantage that the gearbox shafts are only plain bearings. This means that the shafts are simply inserted into a bore and lubricated by the gear oil. This Top Performances transmission cover has ball and needle bearings for the transmission shafts and thus reduces friction losses in the transmission enormously. In addition, damage to the motor housing caused by worn out gear shafts or blocked gears is avoided as far as possible.

The following bearings are installed in the gear cover:

6203 C4 (17x40x12)
HK1412 (14x20x12)
HK2216 (22x28x16)

Suitable for horizontal / horizontal Yamaha Minarelli motors with long housing and the motor letters MY, MA and CW.