Anyone know off hand what size jets came in my 06 KFX400 carb? I would like to know so I can buy a jet 2.5 and 5 larger than what it has in it. I want to remove the airbox and plop a uni in it. I want a little more umph out of it. I also plan on replacing the front sprocket with a 13 tooth (I know this doesnt affect the jet).

 

There are total 3 jets:
Primary main jet: 130
Secondary main jet: 60
Pilot jet: 22.5

 

Thank you so I will get a 135 and 132.5 for the main primary and a 62.5 for the secondary main and keep the pilot the same. I really appreciate it..

 

It will have to be a trial and error, depending how much more air your new air filter would allow in. Also, remember that more air coming through the filter means more dirt as well if the filter surface area is the same or similar as the original one.