HMF exhaust problems

[marsteller199]

i just put a HMF sport series slip on exhaust on my 1999 yamaha warrior and after i REJETTED the carb it seems to be fighting for air once you get above mid gear in all gears. i have taken off my air box lid and that has seemed to work a little does anyone know what else i should do?

[hondarider2006]

filter clean:confused:

[400exstud]

did you rejet? if not, it could be fighting for fuel.

[cals400ex]

what did you change in the carb? if it runs fine with the lid off then you went too big on the jetting (too rich)

[exrider07]

i had the same problem the first time i jetted my 400ex. i read the directions, and i thought i did everything, but when i looked at my carburator, i figured out that i did not actually put a new jet in after i took the stock one out. i hate saying that because it makes me sound so stupid, but it happened, and if that is what happened to you, then i dont feel so bad. the problems i had were in the mid to high end power, i would get into pretty much any gear and get on it a little, and i would just not go but it did not die. just check it.