jetting question

[pa400ex]

i have a bone stock 400ex, and im getting a white bros R-4 slip on, i was just wondering what jetting i should go with, im going to keep my stock air filter and air lid on. i will most likely be using a k&n jet kit if that helps any, this is my first time doing this so please help!

thanks

[2004exrider]

dont buy a jet kit, buy individual jets its a lot cheaper. stock jet is a keihin 148, buy a keihin 165, that should be dead on or a good starting point.

Jimmy

[pa400ex]

ok thanks man, when i get all the parts and do that ill let u know how it went

Ed

[jak1389]

i would say that a 165 would be waaaay too rich for the slip-on and your location. try out a 155 to start and then go up or down from there. when i had a white bros slip on and k&n filter lid on, i didnt change my jetting at all and i was running a tad rich. with all the stuff on my quad now, im only running a 160 main, 40 pilot, clip on the 3rd notch, and it runs perfect. my elevation is approx 2,000 ft.