mmiiimp5
04-26-2007, 01:39 PM
I am having a problem with my 04 400 ex hesitates when i go WOT from a low rpm in 2nd and 3rd. I just put on a K&N, 2in exhaust insert, bumped the main jet from a 148 to a 152 and turned the fuel mixture screw out about 1/4 turn, can really feel the power difference but now if i let the rpms get to low in 2nd or 3rd it hesitates for like 1-2 secs then takes off. I did the spark plug check and it gray on the top of the insulator and dark brown on the sides. should i move the needle down 1 knotch? got any other suggestions.
Thanks for any help
Thanks for any help