Rode up at Mount Baker yesterday. We had some spots where it was a 2-4 minute long pull at full throttle in deep snow. A couple of times my sled just kinda ran out of power. Like it was tightening up. Had to turn out and ride down and give it a break. I am still fairly new to sledding. What is going on? There was no check engine light or warning. No signs of over heating. Usually in a long side hill on right ski but I don't think it was clogging the exhaust. I had the right side buried way deeper at other times and no bog/stalling out. Checked my belts and they still look like new. Clutches were hot. When I dripped some snow on them it sizzled.