If your Murray lawn mower is smoking and blowing black smoke, the engine is almost always 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, since either problem can throw off the air-fuel mixture and lead to a lawn mower engine smoking during operation. On many Murray models, the fix starts with inspecting the carburetor for wear, sticking internal parts, or fuel contamination. If cleaning does not solve the problem, you may need a replacement carburetor or a carburetor repair kit to address issues with the float and related small engine parts. This kind of mower running rich problem should be corrected quickly, since excess fuel can foul the engine and hurt performance. RepairClinic.com makes it easier to diagnose a lawn mower smoking problem and get the right part fast. Enter your model number on RepairClinic.com to find the exact Murray 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 - Murray 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.