jeting help

[riderssb250x]

i need help jeting a 400ex..
stock motor
no airbox lid
foam filter
fmf powercore 4 exhaust tip

jeting is at stock now what should i do ? main jet sizes? pilot sizes? needle position? air screw fuel
? lemme know thanks

[DirtMonkey]

http://www.exriders.com/vbb/showthread.php?s=&threadid=344906&perpage=13&pagenumber=1

[Newrider08]

I would try a 155 main, 42 pilot, 2 1/2 turns out and needle on the 3rd clip from the top

[Sanddraging28]

i agree on the 155 main jet, but IMHO a 42 pilot is to big. i would go no bigger than a 40 pilot.

[leasureryan]

40/155k

[Newrider08]

yeah you might be right about the 42 pilot, I live in Missouri with no choke so it seems that is always my first answer as that is what I run but if you still have a choke the 40 will work for ya