Rear Primary Group - 13/44Z - Minarelli / Yamaha - 50cc 2T - (Polini)

Rear primary group Polini with extended gear ratio / sprockets: 13/44 = 1:3.38. Installing this group is optimal when the power output of the engine is greater than the standard. This allows for an increase in the maximum speed of the scooter without overloading the variomatic transmission. Recommended for racing/tuning engine setups.