If your Yard-Man lawn mower is smoking, especially blowing black smoke, the engine is usually running rich, which means the carburetor is letting in too much fuel. The most likely cause is a carburetor problem, often a stuck-open carburetor float that allows excess gas into the engine. Another common cause is a choke that is stuck closed, which restricts airflow and throws off the air-fuel mixture. When a lawn mower engine smoking issue starts this way, the fix often centers on inspecting or replacing the carburetor or rebuilding it with a carburetor repair kit rather than chasing unrelated engine parts. If your mower is running rich, checking the carburetor assembly for float movement and choke operation is a smart first step. RepairClinic.com makes it easier to match the right Yard-Man carburetor or carburetor repair kit to your machine. Just enter your model number on RepairClinic.com to find the exact replacement part that fits your specific lawn mower and get your mower running clean instead of smoking.
01 - Carburetor is Letting Too Much Fuel In
If the lawn mower engine produces black smoke, this indicates that the carburetor is getting too much fuel (or "running rich"). If the carburetor float is stuck open, the engine will get too much fuel. Similarly, if the carburetor choke is stuck closed, the lawn mower engine will not be able to draw in enough air to create the proper air-fuel mixture.
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02 - Yard-Man Lawn Mower Carburetor
If the lawn mower engine produces black smoke, this indicates that the carburetor is getting too much fuel (or "running rich"). If the carburetor float is stuck open, the engine will get too much fuel. Similarly, if the carburetor choke is stuck closed, the lawn mower engine will not be able to draw in enough air to create the proper air-fuel mixture.
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If the lawn mower engine produces black smoke, this indicates that the carburetor is getting too much fuel (or "running rich"). If the carburetor float is stuck open, the engine will get too much fuel. Similarly, if the carburetor choke is stuck closed, the lawn mower engine will not be able to draw in enough air to create the proper air-fuel mixture.