Polini Variator Kit for 50cc 2-Stroke Piaggio, Derbi, Gilera ScootersCOMPATIBILITY: Aprilia – Mojito 50, Scarabeo 50, SR 50 (Piaggio engine only)Derbi – Atlantis 02 50, GP1 50Gilera – DNA 50 2T, Easy Moving 50 2T, Ice 50 2T, Stalker 50 2T, Storm 50 2T, Typhoon (X) 50 2TPiaggio – Fly 50, Liberty 50, Typhoon 50, Zip 50Vespa – ET2, Primavera 50, Sprint 50Includes: Variator, Ramp Plate, Slides, Variator Boss, 19×15.5 Roller Weights in 6.3g, and 20Kg Torque Spring.Polini Performance Transmission Kit for Vespa ET2 and Piaggio 50cc 2 Stroke Scooters. This kit is designed to improve acceleration on stock, untuned scooters.**