Drive belt-to-sheave clearance is extremely important. It should be set at a maximum of .020 with a new belt. Too much beltto- sheave clearance will cause poor clutch performance. This shim kit allows you to adjust your belt-to-sheave clearance for optimum clutch performance. They are cut to precise I.D. and O.D. dimmensions to insure proper fit in Arctic Cat Clutches. Not for M-7