If your Simplicity lawn mower is smoking, especially blowing black smoke, the engine is usually running rich because the carburetor is letting in too much fuel. The most common cause is a stuck carburetor float that stays open and floods the engine. Right behind that is a choke that is stuck closed, which limits airflow and throws off the air-fuel mix. In many lawn mower smoking complaints, the fix comes down to servicing or replacing the carburetor, and in some cases installing a carburetor repair kit to address worn internal parts. If your Simplicity mower running rich problem started suddenly, check the carburetor first before moving on to less likely issues. Cleaning the carburetor may help, but if the float or other internal components are damaged, replacement is often the better repair. RepairClinic.com makes it easier to match the right part to your machine. Enter your model number to find the exact Simplicity 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 - Simplicity 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.