If your Toro lawn mower is smoking and 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 float stuck open, followed closely by a choke stuck closed that limits airflow and throws off the air-fuel mixture. In many cases, a Toro lawn mower carburetor that is worn, dirty, or sticking internally is the reason the lawn mower engine is smoking. If cleaning or adjustment does not solve the problem, you may need a replacement carburetor or a carburetor repair kit to correct the fuel delivery issue. This kind of lawn mower smoking problem can show up as constant black exhaust, rough running, or a mower running rich after startup. RepairClinic makes it easier to track down the fix. Enter your model number on RepairClinic.com to find the exact Toro carburetor or carburetor repair kit that fits your specific mower, so you can match the right part to your machine and get it back to running clean.
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 - Toro 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.