jetting

[fast4Exr]

what is the correct way to jet a 400ex. how do you know that you have done it correctly. have a white bros e2 slip on and a stock air filter, any suggestions

[cals400ex]

it take a lot of time and practice to get it where you want to be. if your air box lid is on, i would just put in a keihin 150-152. also, turn the fuel screw on the bottom of the carb out 1/4 turn or so. this should be a good starting point.