These compression clutch spring kits are specific for Yamahas T-Max scooter. They are available in two different thrusts easy to recognize thanks to their color: silver-zinc plated and yellow-zinc plated. It is a kit that has been studied to improve and optimize the performance of the clutch engagement and improve the rpm during the coupling. The clutch springs are made of steel with added carbon. 1) The three rollers together with the Polini clutch spring and added to the 12 original ones grant a minor clutch slipping time increasing at the same time the clutch engagement according to the spring hardness. 2) The three rollers that replace the original ones increase the skidding time of the original clutch.