Was riding this weekend and my sled was acting up? The weather was warm (40 degrees) but it also acted up the night before when it was around zero. The sled was bogging when I would hit the throttle so I would have to feather it at times. It was also bogging and backfired (twice) in the 160 mile trip. At WOT the sled would gradually pick up speed / rpms but was not normal. Pulled and replaced plugs twice (dirty / black tips) and it bogged immediately? Also, sled ate about 20 gallons of fuel and about 3/4 of a gallon of oil. My buddies F7 had the same amount of fuel on his gauge (I refueled alone at one stop) and about a use about 2/3 less oil??? Sled has 1,400 miles and I have never cleaned the power valves... Any suggestions, Ideas, recommendation? Thanks in advance for your help!!