I have a 86 Polaris Indy 600 with about 8000 miles. The bushing and bushing retainer slid out of the clutch. It also has some small cracks so i decided it was time for a new clutch. I found one at a snowmobile junkyard that i thought would fit. I turns out it doesn't, and i think my engine shaft is too short because the new clutch pushes all the way up to the engine. I was wondering if anyone knew what years of clutches would interchange with a 86 Polaris Indy 600 LE or how to get the spyder nut off so i could switch the main clutch shaft. Also, is there a easier way to tell if a clutch would fit without pulling it off the sled at the junk yard? Finally, what would make a belt explode or the clutch to start cracking in the first place? Is that a sign the clutches are not aligned? If anyone knows anything about this please let me know.