Polini Performance Clutch Torque Spring for Yamaha Zuma 50 2-stroke and 50F 4-stroke models. Also fits many Minarelli and Minarelli clone scooters. 15% Stiffer Than The Stock Torque Spring.Also fits the following models:Adly: 50cc ATVsAprilia: Scarabeo 50 2TBenelli: Pepe 50, Quattronovex 50Eton: Beamer 2, Viper 50Keeway: Matrix 50, F-Act 50, Hurricane 50Malaguti: F-12 Phantom, Firefox, Yesterday 50Yamaha: Jog, Vino 50, C3 (2T and 4T)Made in Italy!TRUE