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Originally Posted by Rick78
hey my name is Rick, i just got a 2000 gz250 from my neighbor. i cleaned the tank out and cleaned the carb. then bought a new battery for it. it ran perfect for a couple of weeks. now its back firing when slowing down.
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Welcome.It sounds like a little crud still in the carb.The back firing is usually a sign of running lean.Try some SeaFoam or Berrymans b12 in a tank of fresh fuel.You should also install a inline fuel filter if you haven't already.If you adjusted the idle mixture screw,it could be a little lean,turning the screw out makes the mixture richer,turning the screw in is lean.
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