jetting

[trx400exat05]

HI i posted a forum about my jettin prob but i was wondering what jets do u guys think i need for my 2004 400ex that has a power core 4 slip on and K&N filter... with airbox.... i live in ohio but i dont know my height above sea level!! let me know please

[Van Gogh]

I live in NJ, and run a K+N 155 jet. The quad runs great and never bogs even in 2nd gear from almost a complete stop. 20" razor rear K+N filter, White bros header +sillencer

[2004exrider]

in ohio, try a 165 should be a good starting point, if not dead on.

jimmy

[trx400exat05]

I put in a 155 main but it looked really black so wouldnt a one 165 make it richer?

[2004exrider]

if thats is a dyno jet then i have no clue, i was talkin about keihin, sorry for the confusion.

jimmy

[trx400exat05]

yeah its dyno... the z400 uses the keihen i think..... do u know what i should use if im using a 155 main and 40 pilot.. i havent moved the needle cause im not sure how.... and also should i move to a 42 pilot cause when i start up it pops and crackles and it cuts out if i dont give it gas?