csimp3
10-06-2005, 02:31 PM
hey, i got a 04, 400ex yesterday, and it runs great, just wont idle, after about 5-20 seconds of idling just fine, i sounds almost like it misses, the it will die, it will start right back up, but then do it again, also if this helps, it has a pro curcuit t4 pipe, and the previous owner said they changed the main jet, im new to the sport of 4-wheeling, any info will help alot, thanks