HOT ROD SLED SHOP INC. CLUTCH KIT FOR POLARIS 600 2011-2018 121-137" TRACKS UP TO 1.5" LUG. Quicker acceleration, better backshift and big top speed is what you get with our kit. This kit gets you quicker and faster than stock and better backshift to boot when on/off the throttle. The kit includes primary and secondary spring, weights, HRSS helix with 2 different settings.