If your Cub Cadet 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 likely cause is a stuck carburetor float that allows excess gas into the engine. Next, check for a choke that is stuck closed, which limits airflow and throws off the air-fuel mixture. In many cases, a worn or dirty carburetor is the root of the problem, and the fix may be cleaning or replacing the carburetor or rebuilding it with a carburetor repair kit. When a Cub Cadet lawn mower engine smoking problem shows up, it is smart to inspect the carburetor closely before replacing other small engine parts, since this is the most common reason a mower running rich starts smoking. If your lawn mower smoking issue is tied to flooding, fuel odor, or poor performance, the carburetor is still the first place to look. Enter your model number on RepairClinic.com to find the exact Cub Cadet 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 - Cub Cadet 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.