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First try cheap route..stale gas?,water in gas? replace gas

Next...always let it cool down at low idle for a full two minutes before shutting it off.

Next...try carb cleaner in gas careful.. read instructions on can...most cans of carb cleaner are sold to put a whole can in a fullsize car with a 20+ gallon gas tank. So you won't need much for a small 1-2 gallon gas tank. Run the engine normally for that tankful of gas.

Next...remove carburetor disassemble and clean and perhaps put rebuild kit in if older unit or obvious problems.

Next...last resort...pull head and check for sticky valves or timing issues.

Many things can cause backfires, and many small engines are backfiring today because of alcohol in the fuel. It burns hotter and more readily. But that normally shows up in a back fire through the muffler

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Q: Why does 18hp Briggs and stratton backfire through carb?
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