I just recived my HMF Sport complete exhaust I have a 2002 honda 400ex and i mostly ride in wide open areas or trails. I was wondering what jetting I should I use for my new pipe???IF ANYONE KNOWS PLEASE HELP!!!

 

??? can you call them?
do they have a tech line
fmf and procircuit do thats why i ask
? wide open -bigger main -there only a couple bucks ,get the 2 next bigger sizes
try a next size bigger pilot jet as well leave the needle alone
ride it and check the spark plug,
black = rich jetting
white= lean
need -tan, but for wide open a little rich is better ,lean will cause bad things
good luck
the needle--- top clip is the leanest ,and bottom is the richest position
from what i have noticed there good in the 2nd position ,but there are alot of different needles and they have different tapered designs