choke

[m.h.s.c.#527]

is it good to take ur choke out and do i need to rejet and will i noticw n e difference and im sorry i no wrong section but i need an answer fast

y would you want to take it out? not like its heavy...just keep it. it will be easier to start ur 250 with it in the winter next year or the year after when the engine starts to get older

[jakestrx400]

ona 400ex the choke is a butterfly mechanism that retricts the fuel flow even when in the 'off' position
if you remove this then the fuel will flow better allowing the engine too rev better, this will require jetting up your carb

(this is on a 400ex)

:)

[m.h.s.c.#527]

yea its a butterfly and it looks like its restricting air

[jakestrx400]

yes, its worth doing, but you will need to up jet your main jet, i think. .
just go up, and play around =)

[ohsobad_chevy]

Its actually your pilot circuit that will lean out, you may have to up your main, too. ;)