Hours and days of testing go into all of our Ski-Doo Clutch Kits assuring some of the best acceleration gains over stock calibrations anywhere. Quicker backshift and throttle response without any sacrifice in reliability make these kits a must if you want to stay ahead of the competition. Depending on model and year, kit includes: A set of ramps, G.P. primary spring, adjustable pins, G.P. secondary spring, teflon coated helix, instructions & tuning info. Please call for models older than 2003.