how can you find out the correct jetting for mods?

[400exfan19]

is there anyway you can figure out wat jet sizes you need for mods? if there is any1 i have a 2003 KFX and i need the correct jetting for a slip on pro circuit t-4, uni filter w/ outerwear and removed lid. help wuld really really be a appreciated

http://www.jetsrus.com/FAQ_jet_kit.htm

read that

[400exfan19]

thanks for the link. I already had it jetted for the t-4 and just the uni filter but i want to rejet it for the airbox lid removal. is there a way i can check wat the size is? do i go 1 size up for just the removal? thanks

can't tell ya...if you are a little rich now, you may be ok... a little lean an you may need to go up 2 or more... read the link to understand that jetting isn't cut and dry... it is trial & error