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'07 800R Summit; SLP intake, SLP can, 3450 miles (has not been rebuilt) Milled head, all stock after that (including airbox). Riding @ 8,500 - 10,000 ft. Problem just started with this last ride, first time any issues with anything at all (4th season). I noticed a long warm up time needed for sled to stay running to put in reverse to get off trailer. A couple turns around the parking lot and it seemed to stay loaded up even after warming up. New plugs. Going down the trail @ 6,000 - 6,500 rpm , grab a handfull of throttle and a bog that was never there before. This happened all of the ride (25 miles). Some of the bogs were so bad that I almost went over the hood. Checked airbox to see if it had come off. Checked OK. Once it gets past the bog it has no problems getting to 8,200 - 8,300 rpm but then I had another issue there. Clamped throttle on a climb, running @ 8,000+ and it started to cut out, not like the low end bog. Looked @ new plugs back in parking lot and they were fine. The machine has always been a bit of a smoker @ lower rpm and oil use was a little more than other 800R's that I ride with but not overly. Fuel mileage has been fine. Everyone on our crew gets the fuel in the same place and I make a point to put isopropyl in every other fuel up (1/2 bottle). I will pull off the RAVE caps sometime in the next couple of days to see if they are gummed up but I doubt that is the problem. Before I decide to jet down and turn down the oiler I could use some input. The snow just got really good in NW Colorado and I don't want to miss any of it. Thanks