Jetting

[jeremy_283]

what jetting would you guys recomend for a 400ex with a full exhaust system, no airbox lid, and a 42 pilot jet?

[440exking]

I guessing it would be like a 160-170

[ohsobad_chevy]

Originally posted by 440exking
I guessing it would be like a 160-170

I agree that you should start rich and then work your way down, but that sounds a little too rich in my opinion. I would start with a 155 main and a 42 pilot with the needle clip 2nd pos from the top. That should get you pretty close.

[ohsobad_chevy]

Oh yeah, I just seen that you are using dynojets... dynojets are different from the factory keihin jets, i do believe. You might check with your local dealer and ask them what they think.

[Sleeper]

I'm personally turned my mix screw out til it stopped popping on decel for the nost part. I have a 40 pilot. i moved the needle clip one notch down tward the tip of the needle (I call that the #4 position) and am running a 162 main (not dynojet). I may end up bumping the main jet a bit but I don't think so. I jetted it at about 600 feet and I usualy ride from 1500 to 2500 feet. It's burning super clean maybe a hair lean at lower elevations so it will be just about right at the higher elevations (I think).

Goes like hell.

Sleeper

[Sleeper]

Should have read more. Why did you mess with the pilot of you are using the dyno jet kit. Don't they have a magic needle so you don't have to? Did you buy this with a DJ kit in it? If so go to thier site and download the instructions. it's pretty simple to follow.



Sleeper