Stage6 primary gear-up kit for Yamaha Aerox/ Minarelli horizontal 50cc 2-stroke scooters.

Only for use with tuned engines! Original standard cylinders are normally not powerful enough to pull this sort of gearing.
Contrary to common gear units, the ones from Stage6 come ready pressed, simply replace the old gear unit with the new one - and that's it!

Primary 14/42 (overall ratio 1:3.00) 

Attention: You have to count the teeth of the intermediate shaft of the original gear and order the product with the same number of teeth.

Stage6 S6-2016613P, S6-2016612P