400exJOE
10-31-2001, 03:34 PM
I have a 2001 stock 400ex, and just put a Supertrapp IDS2 slip-on on it. I have a K&N filter, prefilter, and Dynojet kit. It says to run a 170 jet, but when I did that it fouled my plug. I put a new plug in and jetted it to 165. It ran fine for 5 min and I left it idleing to warm it up before I checked the plug. It stalled and didnt want to start. When I checked the plug it was black. I then tried a 160 and it didn't want to run. It was also cold and damp when I was working on it.(Dont know it that changes anything). I live in Upstate NY. If anyone has a 400ex w/ a K&N, Dynojet kit, and Supertrapp please let me know your setup. Thanks a lot