If your Craftsman lawn mower is smoking, especially if it is blowing black smoke, the engine is usually running rich because the carburetor is letting in too much fuel. The most common cause is a carburetor float stuck open, which can flood the engine with gas. Right behind that is a choke stuck closed, which limits airflow and throws off the air-fuel mix. In many cases, the fix comes down to inspecting the carburetor itself for wear, sticking internal parts, or fuel buildup, then cleaning, rebuilding, or replacing it as needed. A carburetor repair kit can help if the problem is isolated to serviceable internal components, but if the carburetor body or float system is too worn, replacing the full carburetor is often the better move. If your lawn mower engine is smoking, your mower is running rich, or you are dealing with a Craftsman mower blowing black smoke, RepairClinic.com can help you match the symptom to the right repair. Enter your model number on RepairClinic.com to find the exact Craftsman carburetor or carburetor repair kit that fits your specific lawn mower.
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 - Craftsman 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.