I have a 2000 400 ex. I just put a fmf powerbomb header and powercore 4 silencer and k&n filter on it. I bumped the main jet up to a 150 and the pilot jet to a 40. The bike idles great, but when i try to take of it bogs and the engine stalls. The headers are starting to turn blue comming right out of the heads. Does this mean that it is running too hot? anyone have any recomendations on what i should do?