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Why is my 21 horsepower Briggs and stratton engine in my Husqavarna riding lawnmower running rough with black smoke and gasoline being sucked up into air filter housing?
Wiki User
∙ 15y ago
Black smoke means it's getting too much gas. Gas at the air filter also means that it's getting too much gas. The most likely cause it that the float valve is either sticking or has something stuck in it letting gas continually seep by it. Sounds like a good carb cleaning is in order.....
Wiki User
∙ 15y ago
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