So I bought a new 09 WR450 last Saturday. From the moment I unloaded it, it ran terrible on the bottom, up to about 1/4 throttle. It coughs and sputters. It has a BAD off idle bog, to the point it will almost kill the engine. When I shut it off, it backfires out the exhaust. Within the first 20minutes of ride time, it overheated. ***? I know these things are lean from the factory but this is ridiculous! I'm taking it back to the dealer tomorrow but we all know how that will go.