what size jet do i use for a 400ex?????

[exrider360]

i got a 02 400ex with a full system on it and i need to know what is a good size jet to use. any help will be appericated:confused:

[trailburner]

are you runing with the lid on or off???what kind of system[name brand]?? allso do a search on "jetting" there is a ton of info.

[cals400ex]

let us know every mod you have done and what is the elevation and temp your riding at.

[exrider360]

THIS is on of his buddys were riding in cold weather right now about 350 to 40 but when it gets hout its about 75 to 80 hes got a fmf power bomb header with a white brothers slip on. ANd holes drilled in the air box lid. IDk what elavation were riding at but were 30 minutes south or albany new york.

[cals400ex]

i would probally start around a 155 or 158 keihin main jet. you might have to tinker with the needle clip and pilot jet/fuel skrew.