pro-circuit t-4 jetting

[300ex_rida]

Does anyone know the correct jetting for a 400ex with a pro-circuit t4 slip on and a k&n filter? Please help. Thanx

[Pappy]

155 with no lid.....

or a 152 or 148 with lid.

do some jetting runs and see what works best and check that plug:macho

[300exTJjeeper]

WOW that's kinda real rich. I just got done rejetting mine. 300ex with a T4 and uni with unit pre fitlers on teh lid plu s aocuple more holes.

I run a 128 main, clip on #4, and I bileve a 28 on the pilot, and 3 turns out on the screw.

THe pilot was 2 sizes up from stock I don;'t have my papers with the correct size wbut that is what I run at.

Good Luck

[bmw500hp]

Yup...148 with the T-4 was lean, 152 was good. Wanted the protection of the airbox lid but running a Uni-filter :)

[Desert Rat]

I've got a T-4 on mine, no airbox lid and some other mods. I purchased the K&N power kit that has a filter, outer wear, cleaner/oil and a dino-jet kit. The kit contains a different taper needle, several main jets and instructions for which to use under various elevations and temperatures. Worked great for me. I'm sure it would be the same if you just purchase a dino-jet kit. A little pricey but well worth it. That is the way I would go. Mine is runing the stock pilot jet and the main I think is more like a 160 at 4,500 elevation. Can't remember without looking at the kit to see what one is in it for sure. I go up one jet size for trips to the lowlands a down a Jet size when riding trails at high elevations.

[BARRY]

i live in ohio also. just followed directions word for word with the k.n jet kit with elevation below 3000feet and i got it spot on the first time.:devil :devil