i bouguht my 800 summit 08 with a 154 inch track i blew a belt at 350 miles i had my borther talk to the dealer in michigan for me he said to bring it in they checked everything out free of charge for me and checked the clutches and said it had the springs in it for the high altitude and thats why it cuased the belt to blow, the primary clutch was slipping cause the secondary was opening faster that it, they changed the spring and weights for me gave me the old kit incase i need it and i have had no problems since, the dealer said thats why my clutches were getting to hot also to much belt slip. after about 10 hours it runs alot better uses less oil. its a blast i'm looking for a turbo for it now