The Polini Ø61 cylinder kit is designed to increase the performances of Piaggio 125-150cc engines 4 stroke 4 valves (Euro 4 and Euro 5).
Thanks to the increase of the displacement to 171,8cc, the kit guarantees 40% more in acceleration, significantly improving engine response. The cylinder is made in aluminium with cast iron barrel, while the aluminium piston is equipped with high performance piston rings: one is chromed, one is in steel and with oil scraper.
For an optimal performance, it is necessary to combine it with the dedicated ECU.