I am the guy in rtx's post about the Scrambler. It is a 99 Scrambler 400 and we took it up to Maine over the weekend. Ran fine all day until the end. Same issue as before, on flat ground it runs perfect. As soon as we hit a hill and slowed down it would get bogged down and I couldn't get any power to it. I had to roll back down the hill and get a running start to get up. One thing that was noticed was when it would lose power like that the quad would exhaust more smoke (than normal) with a bluish tint out of it. It was to a point where the guys riding behind me could see when my quad would start losing power because of the amount of colored smoke coming out of my exhaust. I didn't notice any problems going through water, only hills. On the last hill of the day we had to push it up to the top and as soon as I got up there it started running fine again. Really perplexed by this problem and hoping someone has an idea or solution to it.