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Kawasaki 05 kfx 400 backfires and stalls out

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hello I just bought a 2005 kfx 400 and it starts and idles great but when you ride it for a couple minutes it backfires sputters and stalls any advice on where to start will idle all day long its a little chilly out too about 40

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Clean your carb out. Carb cleaner, compressed air, and welding tip cleaners. Also, note what jets are in it and make sure they are the correct ones for any mods that have been done. See Suzukicentral.com as well for more info.

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has quad been sitting ,with old gas , its the pet cock on it take out 2 bolts on tank remove the petcock spray it with cleaner , clean carb, you will be fine , common with them , hope i helped bill,

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if that dont fix it, check valves, if an engine runs cold and becomes hard to start warm it's a sign the valves are going, they get tighter when warmed up

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