what jetting

[cabex]

What jetting would I need for and wb e-series and a kn filter, on a 400ex?

thanks

[RED121572]

Jettings not hard, it just takes alot of trial and error. When I just had a filter and the WB's slip on, I didnt touch the pilot. I moved the clip on the needle down one notch and ended up using a 155 main.

Your best bet is get yourself 150-160 main jets. With each jet, give it a full throttle test until your running too rich. Youll know when you have, your bike will sputter close to top speed, then drop down one main and it should be spot on.

With the mods I have below, it took me two weekends to find that a 163 is best for my machine. One jet higher or lower, the machine would sputter at very high RPM's.

Good luck!