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This is a 2 spring set for fine tuning the tension applied to the belt. These torque springs come two to a set, one white, and one blue. The White spring is 7% stiffer than stock, and the blue spring is 15% stiffer than stock. if you have a tuned / performance 50cc Honda, you need this kit. It is impossible to just pick out the correct spring at random, that's why you can buy this kit an figure out exactly which spring works for your bike.
These springs fit all 50cc Honda / Kymco clutches.