I have a 1998 Polaris Indy Special 600 triple. I got out playing around and got stuck in some deep snow with a lot of rock and dirt underneath. When I got out the track wouldn't engage. I assumed it was packed with snow and dirt so I had it towed home. When I cleaned out all the snow and dirt I found a big rock jammed between the tunnel and the track. Had to get out the old air chisel to get it out. Took it for a test drive and noticed it had a vibration. Took it back in my shop, checked it out thoroughly and didn't notice anything. Took it for another test ride and it still had the vibration but also stretched the belt as well as broke off the nodes of the belt from slapping the aluminum guide underneath. I'm at a loss as to what's going on with it! Any ideas?