400exridered
03-22-2009, 07:27 AM
I have a 07 400ex stock. I just ordered a fmf slip on pipe. I also plan to run a k&n air filter with an outerwear over it with the air box lid off. dyno jetting is what I will be using. I live in lower michigan ride temp is between 50-90 deg. I am not sure about sea level. if anybody could steer me in the right direction for what size jets to use that would be great.