jetting for 250ex

[the_coop]

i need to know what size jet i should run in my 250ex i have k&n air filer with fmf megamax slip on with no air box lid and it pops when you let of the throttle and i put a 105 jet in it and it dodn't seem to be doin the job and i need to know what would be the best for it



thanks

[Quadster450]

I know you have an FMF but these guys at HMF have a lot of info on jetting.
check this link and search their forums
http://www.hmfengineering.com/forums/archive/index.php/t-118.html

[450Rchaser]

popping on decell might be to fat adjust with air mix screw to componsate i run full hmf on my 250ex w/no air box lid main jet is 125 & just a little to fat i need 1 size smaller

[313racing]

try dialing it in maybe buy three jets a 110,115,120
im guessing u should use a 115 but idk i had a curtis sparks full system and ran that on a 120 stock filter and it was great!!!