If your Echo 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. On this symptom, the most likely cause is a carburetor problem such as a stuck-open carburetor float or a choke that is stuck closed, both of which can upset the air-fuel mixture and lead to an Echo lawn mower engine smoking condition. In many cases, the fix comes down to inspecting the carburetor, cleaning or rebuilding it with a carburetor repair kit, or replacing it if internal parts are worn or sticking. If your mower running rich problem started suddenly, check for fuel-related buildup inside the carburetor that can keep the float from sealing properly. RepairClinic can help you track down the exact cause and the right replacement part, whether you need an Echo carburetor, carburetor repair kit, gasket and seal, or related small engine parts. Enter your model number on RepairClinic.com to find the exact parts that fit your specific Echo 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 - Echo 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.