[Dkishbaugh]

I'm new here and this is my first time posting. I recently got a 2003 trx400ex it wasn't ridden much maybe 75 hours and it was by an older gentleman at my work. It runs great but I wanted to get more out of it so I went with a lexx mxe slip on I took the quite cork out, ground the header welds on stock pipe and I also put on a uni filter. I plan on running my air box lid due to wet conditions I ride in. I've never jetted anything before and but am very mechanically inclined. I'm at 700ft above sea level. Can someone point me in the right direction to start my jetting. And how to tell if i need to go up or down from that number. I bought a hmf jet kit and it came with keihin jets. It also comes with 42 pilot jet. Should I run that as well or stay with the stock 38. Any help will be greatly appreciated thank you

 

[Dkishbaugh]

I don't need to mess with the needle jet? And if it bogs down I'm to rich, and back fire on deceleration is too lean? So say it's backfiring do I just go up a jet size?

 

[Dkishbaugh]

Okay and I can tell at first just looking at the plug to tell if it's running rich or lean correct? Once I get it to be cardboard colored then do the chop test?

 

[Dkishbaugh]

Okay thank for the help. I'm really dreading doing this but can't wait to see the difference these mods have made. I didn't even get to hear the exhaust yet i put it on the quad but I'm still waiting for jet kit to come

 

[Dkishbaugh]

Okay I got it all done runs great I went with a 170 main but I have no idle what so ever and no idle adjustment. I've turned the idle adjustment to the extreme both ways and everywhere in between. If I give it a little gas it runs smooth and not fast at all. So essentially I can make it idle by giving it slight gas. If not it instantly dies. I read on someone else's forum that it could be a blocked idle cuircut. I pulled air fuel mixture screw and through pilot and cleaned very well, had carb cleaner and compressed air flowing out the inside ports. What else could it be. A guy told me it could be my throttle cable needs adjusted. Is this true

 

[Dkishbaugh]

I'm at 2 1/2 on mixture and I had carb cleaner flowing through the all the inside holes. The idle adjustment is not stripped I had the black plastic off the side of the carb and it actually does adjust just has no affect