ProCircuit T-4 Jetting

[ruinplay]

:rolleyes: Hello, Newbie to the forum.....

I called Pro Circuit for recomendations on jetting my 02 400ex with a T-4 exhaust. They advised using a 155 main jet and 55 pilot jet. I live at approxamately 1000 above sea level. Harrisburg PA. I was concerned that the 55 pilot jet might be a bit high. Any experience on where I should began at or does this sound accurrate?

Thanks

[thame2010]

if the T-4 is your only mod.. from what I know I guess you should be using a 40 or 42 pilot jet.. but I think the main jet is ok ;)
hope I'm right :confused:

[ruinplay]

Thame 2010,

Thanks for the quick reply. I plan on putting a K& N filter . The pipe is not on Yet, but will tonight. I'll go with the 155 main jet change and start with the 42 pilot. Do you confir????

Thanks

[thame2010]

Oh Yeah! Completely :D
Cause I'm getting a UNI and a HMF.. and I'll be using a 155 main jet and a 42 pilot.. I think it's a good start ;)

[cals400ex]

with the air box lid on, that sounds good. i would run that jetting with the fuel screw turned out 2.5 turns from lightly seated for starters.

[jesshamner]

I believe I'm a little over 700ft. and I just used a 160 main. I probably could have went with the 165 main. I didn't even mess with the pilot. Just another option. Have fun with it. I loved the sound of my t-4 when I had the 400ex.

[Crawl69]

I called pro circuit after I got my t4 and they told me to back out the airscrew quarter to a half turn.