If your Troy-Bilt lawn mower is smoking, especially if you see black smoke, the engine is usually running rich, which means the carburetor is letting in too much fuel. The most likely cause is a stuck carburetor float that stays open and floods the engine. Another common cause is a choke that is stuck closed, which restricts airflow and throws off the air-fuel mixture. In many cases, a worn or dirty carburetor is the root of the problem, and cleaning or rebuilding it with a carburetor repair kit can get the mower running clean again. If the damage or wear is more severe, replacing the carburetor may be the better fix. So if your Troy-Bilt lawn mower is smoking, your mower is blowing black smoke, or you are dealing with a mower running rich condition, start by checking the carburetor, float, and choke operation. Enter your model number on RepairClinic.com to find the exact Troy-Bilt 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 - Troy-Bilt 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.