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    14.5 hp briggs & stratton backfire issue

    Hey everyone I have a Simplicity mower with a Briggs and Stratton engine Model 28770 after engine is warm 5-10 Minutes starts to backfire from both carb and muffler. I have replaced the Carb, spark plug, cleaned the flywheel, rechecked all my gaps. Any ideas. Mower had been sitting for 2 years
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