I use a scotch brite pad (the stiffer green, not red) and out a nice "X" pattern on the clutches. Just scuff em up, clean with acetone, and run the sled. The first 100 miles or so it might be rough on the belt, but eventually the belt will "wear" the sufrace nice and smooth. I would recomend using a used belt for awhile.
Or you could use 600 grit wet sand but nothing coarser as you will eat belts make sure the surface is cleaned after with a good quality solvent that leaves no residue and like 800mxz says it doent hurt to use an old belt (not a junk one) at first, remember new belts need about 30 miles of runnin to break in
A forum community dedicated to snowmobile owners and enthusiasts. Come join the discussion about performance, troubleshooting, trails, maintenance, riding tips, modifications, classifieds, accessories, and more!