ouhockeyplayer
03-09-2007, 08:31 AM
First off I would like to say that I am brand new to this board and look forward to using everyones wealth of knowledge on the subject. Ok here is the problem. I have a 2004 400ex that I bought as a left over two summers ago. It has always been difficult to start from day one and never liked to idle. (My dealer did a horrible job on prepping it) Well I can never leave anything alone, so I decided to add a Dubach Racing slip on and K&N air filter to it. I also added a rev box too. I've done many other mods too but that is the extent of the go fast stuff. After the mods it would not idle at all, and I had to constantly be on the gas. It would backfire and sputter while I did this. I adjusted the idle all the way seeing the idle was week but it had little effect. So I then had the dealer rejet the carb and it ran fine after that, but the idle is still almost all the way up and not overly quick like it should be. Well now the problem is back again and when I go to warm it up the header pipe glows red. I took the spark plug out and it is black in color. I don't remember what size main jet was replaced at the dealers, but I think that is all they changed after calling Dubach Racing. The weather in Michigan is pretty cold right now, and I am sure that is having some effect. PLEASE HELP, I want to ride..