Stage6 Primary Transmission 13/43 (3.31) for Minarelli engines with 13-tooth intermediate shaft. Pre-pressed gearbox fits all Minarelli models including Areox, Booster, and F12.

This extended gear ratio increases top speed when paired with performance cylinders, as stock power units lack sufficient output for taller gearing. The pre-pressed design eliminates complex assembly — simply swap your old gears for new ones and reassemble.

Verify your original intermediate shaft has exactly 13 teeth before purchasing, as Minarelli gearboxes have multiple middle gear pair versions.

Installation is straightforward : remove worn transmission gears, install the new set, and close the cover.