Jetting

[honda400-4-ever]

Right now i have a t-4 slip-on, jet kit, and k&n, i thinkin of getting a powerbomb header what should i do to the jetting??

[BEAVER.989]

I can't imagine it making a big difference, honestly. If anything maybe one size larger on the main, but I'd ride it first.

[honda400ex2003]

when i had my k&n and my slip on only i had a dj 138 with the needle on tghe 3rd position and the f/a was 3 turns out. i will look to see what the equivalent keihin is but i would assume that if you go up to a 142 dj you should be good to go. maybe even a 145 would be good. I will check out the cross ref. to see what they are and get back to you. steve

[honda400ex2003]

Width------Keihin # -- DynoJets # -- Mikuni #

0.0570---- 147.5------- 136--------- 127.5
0.0580---- 150--------- 138--------- 129.4
0.0590---- 152.5------- 140--------- 131.3
0.0600---- 155--------- 142--------- 133.1
0.0610---- 157.5------- 144--------- 135.0
0.0620---- 160--------- 146--------- 136.9
0.0630---- 162.5------- 148--------- 138.8

A 155 or a 156 would probably get you really close with a header too. Oh also i had my lid on when i ran the filter and slip on. steve