400ex help pls!!!

[blacklabel117]

ok so i got a 400ex and i have a whitebrothers exhaust its a slip on but i just ordered a k&n airfilter and in that kit it says that i can take my air box lid off and i was wondering if i am goin to have to jet it???

yes you are...

go to www.jetsrus.com and read their faq on jets and jetting

[blacklabel117]

hey sorry 4 writting it out long man

[blacklabel117]

ok so i ordered some jets and i was curiouse is the 40 pilot and the 152 main going to work for this?

[aDviSol2y]

I would use a 42 pilot and a bigger main.

re read what posted...or should i say read it again...jetting is not as simple as can i put this one in...you need to see what one is right for your machine, as it may not be right for my identical machine sitting right next to it

[blacklabel117]

well man iv got a pro mechanic helping me nd if they dont work w.e. i will order new ones if they do good deal... not to worried

[blacklabel117]

ok guys so i put the 40 pilot in and left the 148 main in otherwise if i put the 150 or 152 in it was rly stumbly and crappy but the 148 is working with the 40 nd to b honest its kinda stumbly but good is that normal?