It makes the best even better! Also the Yamaha “Aerox” tuned up with Polini parts debuted on the track in Viterbo during the 70 Evolution Scooter Trophy. The personalized Polini colors make the shape of this scooter, tuned up for the track races of the Polini Italian Cup, even more beautiful. The water cooled cylinder distinguishes itself to be cast iron made and self-lubricating. It grants better mechanic resistance. It reduces the engine running temperature and it eliminates possible loss of power. The bore is of 47mm. The cylinder liner has 5 transfer ports plus an “oval” exhaust port. The distribution diagram is “racing” type. The piston is in aluminium die-cast at high silicon content and has a chrome-plated "S10" cast iron segment. It features a core chilled aluminium alloy head. The specific squish eliminates any detonation problems and grants the 100% heat exchange. The exhaust system is the famous “Polini For race 2” born for the on track races but that finds its own ideal employment on the public ways, since it is homologated. “Polini For Race 2“ mufflers features two different expansions: an external and an inner one. The external expansion chamber, made of two special P04 steel shells at low carbon content, includes a smaller expansion wrapped with a thick layer of special deadening material. The silencer is made of light alloy and follows the same production philosophy. The inner core with direct exhaust is wrapped with deadening material and then it was placed in the external exhaust made of light alloy.

For highest level performance and optimization of the power output at every rpm you may fit the “HI SPEED” kit. It’s a complete variator kit that includes rollers, compression spring and EVO SLIDER: The “HI-SPEED” was studied with specific calibrations for the original manufactured scooter. The new half-pulley, made of die-cast light alloy with high silicon content, is produced with wear-resistant and self-lubricating material; it lets the compression spring slide constantly eliminating the vibrations of the spring and favouring its sliding and the progression of the pulley on the cam. It makes the shift change of your scooter even faster and more constant. Look at Polini catalogue and you may find power units or parts to improve the performance of your scooter.