NEW FOR 2016--Our new STAGE 2 clutch kit--This clutch kit for the 120-137" 800R carbed models accelerates harder than stock and backshifts quicker as well. Corner to corner on/off throttle reponse is instantaneous...one tester said it was almost like his sno-x mod sled. If you want even faster corner to corner pull from your 120' shorty, the lower gear & chain kit (acceleration kit)we offer works really well. Its been tested with ported trail motors up to 174 hp.! Gearing from 21-45 to 27-45 and tracks from 1" to 1-3/4" lugs have been calibrated also. The adjustable pin kit allows us to have accurate calibrations for almost any elevation and application. This kit includes Primary spring, secondary spring, Hot Rod Sled Shop adjustable pin kit, HRSS1 ramp set, oversize rollers, and progressive helix.