I was riding with a friend of mine yesterday in the snowies. He has a new XP. After about two hours of riding his sled started to cut out. It would primarily do it when climbing in powder. The powder wasn't all that deep. The sled would run good at half throttle but if you put it to the bars it would run alright for a minute and then almost die. It would stall so hard it would try to throw you over the bars. If you tried to take off at full throttle it wouldn't go. He has had this problem before. He took it into his dealer and they cleaned the clutchs and said that should fix it. Besides a new dealer what could be happening?