Bike wont run right

[marlbank400ex]

hey guys im new to this and i need sum help.......i just bought a 2005 400ex and sum things for it that ppl said to get...K and N air box lid filter and 170main jet (it came with it) and 42 pilot jet...and now it it wont start or anything.....i dont think i did sumthing right...or maybe the jet is too rich??? i have no clue....ANY info would be extrmely helpful guys....thanx a bunch

[hondaboy400ex55]

Jets to big

[marlbank400ex]

u meen the main jet is too big?...i have a 168 they both came with the k and n lid filter.....so do u think thats the problem?
thanks again man

[PismoLocal]

Try adjusting the fuel mixture screw.

[400exstud]

If it only has a K & N filter it should only be like 1 above the main jet. Pilot is mostly the owners choice.

[marlbank400ex]

i know this is the dumbest thing you have ever heard...but which one is that????....is it the one beside the choke cuz if i turn that gas leaks out

[marlbank400ex]

what if i replace the 170 main jet wiht the stock one and keep the 42 pilot in????......cuz before i changed both jets my bike would die off if i had it pinned out

[PismoLocal]

i live at sea lvl and i used to run a k&n with no aibox lid and a curtis sparks full system and i had a 42 pilot and a 155 main a 170 sounds gigantic if you ask me. at the most i would run like a 160 and then tune it with the fuel mixture screw.

[450Rchaser]

Try like a 152 main