Doppler Racing SX89 Evo clutch for 50cc scooters : Minarelli 107 Nitro Aerox Booster Bw's - Peugeot - Gilera - Piaggio - Sym - Kymco and Wallaroo / Fox The result of Doppler's involvement in timed RUN competitions, it has been designed to handle high power levels thanks to its reinforcement plate and reinforced friction linings. The springs that open the jaws are mounted on...