Clutch spring for for clutch shoes with three wear pads found on 47 and 49cc, reed-inducted engines which are the type commonly found on small pocket bikes, small ATV, 2-Stroke Quad, etc. All our clutch springs are made by machine manufacturers so you know the parts have been designed for the machines we suggest. All springs have been produced from lightweight durable metal for long life and performance. Which machines do these springs fit? This item will fit Chinese air cooled mini motos. Clutch springs may crossover to fit many other clutches, so please check the dimensions and pictures to confirm their suitability for other models. Please Note: 33, 36, 43 and 49cc engines with a 2-piece clutch are not compatible with this spring.