sounds like reeds. if it is stock it has metal reeds that hardly ever go bad but i would check that first.
Mark
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Jammin Josh: 2005 YZ/EX Hybird 2007 sponsors: WRH Racing, Nacs, K & K, Legacy, Elka, LSR Racing Holeshot Bubba:For Sale !! 2005 Eton Viper, And 1998 Honda 300ex, too much to list. 2007 sponsors, WRH Racing, Works Shocks, Oneal. LSR Racing, Nacs Racing 2003 SRMA AX Series Mini Quad Champ, 2004 SRMA Tri State AX Mini Quad Champ, Hancock Amateur AX Mini Quad Champ, 2004 Mobile MX Summer Series Mini Quad Champ ( 2 Classes ) 2005 DSQRA 2nd Supermini, 2006 Gulfcoast MX Series Champ
I had same prob on my 90 arctic cat it would spit gas and not run unless air fuel screw was all the way in and it was bad rings so check compression take out plug and see if you have any if valves are good it should push your finger off