jetting for application,HELP

[Cwad_BoyEX]

Ok iam running a 400 ex and i cant decide what jet to use i have a k&n air filter with the spark arrestor out and dont know what to use , PLEASE HELP

[AtvMxRider]

You are prolly not going to have to rejet at all. If so I would go up to a 150.

[Cwad_BoyEX]

I dont have a 150 what about a 155

[AtvMxRider]

155 is probably going to be too rich.

[Cwad_BoyEX]

the jets that i have are 134,138,142,146,155,160,165,170 Thats what i have so probley a 146?

[AtvMxRider]

It comes stock with a 148. I would just run it with that and check it.

[Cwad_BoyEX]

Does it matter if i have the dyno jet needle in it?

[Cwad_BoyEX]

And do you mean check it:huh iam kinda new in the quad world.

[Cwad_BoyEX]

And what do you mean check it how do you check it:huh

[Chanman420q]

just go to ur dealer and get a 150.... that right there might even be to rich.....

[ewalker302]

The jets sizes you listed comes with the Dyno Jet kit.
The DJ numbers are different than the stock jet numbers.

Your bike came with a 148 Main Jet.
The Dyno Jet 146 is one size larger than that.
I have no idea why they did that, just to confuse people I guess.

I know you got the jets and want to do something with em, but you arent going to see any improvement unless you go out and get at least a pipe first.

Then put in the DJ 146 and you will be good to go.

If your bike backfires on decelleration now that means its too lean.
If thats the case go ahead & put in the 146

It probably is if you are running no airbox lid.
:bandit:

[Dune Surfer]

bumperoni

[Cwad_BoyEX]

What does that mean

[Dune Surfer]

Originally posted by Cwad_BoyEX
What does that mean

it moves the post to the front of the list.