another jetting ?

[mgaskey]

what size main jet should i use for my stock 400ex, with hmf slip on, needle clip in second position from bottom, air fuel screw 3 turns out with no airbox lid. thanks for the help

[plkmonster2]

Start with a 155 main jet. Your elevation and temps would also be helpful! Also, put in a 42 pilot, and set your mixture screw at 2-2.5 turns out.

[mgaskey]

my elevation is about 1500 ft and the temperature is usually about 75 to 90 right now. thanks for the help