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I am having the same problem and found that there was a leak in my exaust system. I fixed it and it stopped the backfire. I also heard if you seafoam the gas that it could help. The air idle screw on your carb acts like it does nothing but if you adjust that it can also help reduce the bacfire but not stop it.

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10y ago
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Q: Why does the Polaris predator 90cc backfire?
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