[FOXRIDER3361]

Ok so I have had some Issuse with quad not wanting to start or idle when it starts. So i trouble shot it and found a large crack in the intake boot from the card to motor so I ordered a new one. I also took carb apart and cleaned it do you think that I need to rejet it while it is apart? I have a performance air cleaner on it and chopped the spark arestor. Will this require rejeting also?

 

[Billy250X]

Yes you should jet and remove airbox lid.What main jet are you running now?

 

[tomgodd]

When I added a K&N filter to my 400ex I went to the next size jet on the main .

 

[TRX2fiveO]

agree^^^^ 122 main and 38 slowjet is stock I wouldn't go anymore than 124 on your set-up and 40 on the slowjet if you slow jet is 35 which I've seen in 2 out of the 3 carbs I do have then step up to a 38 turn you pilot screw in ntil it seats and back it out about 2 3/4 turns and reset the Idle to about 1400 rpms

 

[FOXRIDER3361]

O so what set up should I do?

 

[FOXRIDER3361]

Yes you should jet and remove airbox lid.What main jet are you running now?

Yea I am going to mod my air box like yours where didd you get your pre filter? and Im not sure what jet size I have

 

[Billy250X]

Run a 124 main and a 40 pilot.