my 300 ex has a K&N air filter with no lid, has been re-jetted and has a white bros. e series exhaust on it. There is a loud speratic sucking sound coming from the air box and the quad will not idle properly. With the choke on it idles to high but as soon as you shut the chock off it dies. Can anyone help?

 

on the left side of a 300ex to the right of the choke is the pilot screw turn this half a turn at a time and see it that helps any

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1997 300ex red
450r stock bumper
dg nerfs
dg grab bar
maier rear plastic
fullbore front plastic
razr tires all around
pro design tether switch
pro grip grips (soft compound)

2007 trx450r white
dg bumper
dg nerfs
dg grab bar
hole shot hd tires up front on beadlocks
msr6 hole shots on rear with beadlocks
pro design tether switch
powermadd handguards white