jet for new air filter?

[atvextremerider]

i got a uni air filter for my 400ex and do i need to jet it if i run a open air filter? Also it is making a sucking sound from the cabrurator

[jake"08"400]

Make sure your clamps are tight on the air filter to the carb and from the carb to the engine. As far as jetting you could prolly bump up the main to a 150 and it should be good. That's what we did to my buddys and his running a k&n filter. Maybe back your f/a screw out to 2.5 are 3. That's just what we did to my buddys so I'm just guessing.:D

[400exmxrider15]

That noise you are hearing is normal, however, it can also be lean, I suggest throwing 150 in it and doing a plug chop. Remember, white-too lean, black-too irch, cardboard brown- perfect.

[honda400ex2003]

3 turns out on the f/a and a 150 will get you where you need to be.

steve

[atvextremerider]

where is the f/a screw at? a pic would help

[hocman123]

if u are looking at the bottom of the carb at the bowl there will be a tall tower of metal sticking out of one side with a screw in the top of it. if u have a 05 or newer u need to get a special D shaped adapter to turn the screw.

[atvextremerider]

Originally posted by hocman123
if u are looking at the bottom of the carb at the bowl there will be a tall tower of metal sticking out of one side with a screw in the top of it. if u have a 05 or newer u need to get a special D shaped adapter to turn the screw.

where can u get them at?

[honda400ex2003]

dynojet has the tool but you have to call them and say you want it.

steve

[jake"08"400]

You can actually go to there site and click on tools are something of that nature and they have them on there now.(the d shaped tool)

[honda400ex2003]

cool! they finally added it to their site. :D steve

[jake"08"400]

Yea right after I put the 99-04 f/a screw in mine lol

[honda400ex2003]

lol :D they have had it for a couple of years, you just had to call to get it.

steve