If your Husqvarna lawn mower is smoking, especially blowing black smoke, the engine is usually running rich because the carburetor is letting in too much fuel. On this symptom page, the most likely cause is a carburetor problem such as a carburetor float stuck open or a choke stuck closed, both of which throw off the air-fuel mix and can lead to a lawn mower engine smoking or a mower running rich. In many cases, the fix is cleaning, rebuilding, or replacing the carburetor, and a carburetor repair kit may take care of worn internal parts without replacing the whole assembly. Checking the carburetor float and related carburetor gaskets is a smart place to start if your Husqvarna mower is smoking during operation. RepairClinic.com makes it easier to match the right fix to your machine. Enter your model number to find the exact Husqvarna carburetor or carburetor repair kit that fits your specific lawn mower, whether you are handling a quick diagnosis or doing a more complete small engine repair.
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 - Husqvarna 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.