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Your mower is over fueled - could be the choke is stuck on or the needle might be stuck open on your float.
Could also be running rich due to a dirty/clogged air filter or faulty spark plug.
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∙ 13y ago
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Briggs and Stratton 4.5 hp lawn mower starts easily enough but revs inconsistently and puffs black smoke what could the matter be?
Because of the inconsistant revving and the puffs of black smoke, I would say that the air filter is clogged and/or the spark plug needs replacing. Else, the carburetor is set too rich or the choke is sticking.
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If its black smoke you are burning oil possibly due to oil getting in your exhaust by tilting the lawnmower on its side or your rings are allowing oil by.
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It depends if the smoke is blueish it is burning oil .I it is black it is usually over fueled.
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