![]() ![]() Continuing blue or white smoke could also indicate that some of the engine’s components or seals are worn out and need replacement. If the previous steps don’t correct blue or white smoke, your mower could have a more serious problem, such as an air leak in the crankshaft (the cast iron or cast aluminum case that protects the moving parts of a mower’s engine). Take your mower to a repair shop if necessary. Either take the mower to a professional or adjust the carburetor yourself with instructions in your owner’s manual. If the black smoke still appears, the carburetor might need to be adjusted in order to increase airflow. (Note: air filters vary by mower model view example air filter on Amazon.) Next, run your lawn mower for a few minutes. It’s possible that a dirty or clogged air filter is preventing sufficient airflow into the carburetor. If the carburetor isn’t getting enough air, the mixture has a higher percentage of gasoline, which can create black exhaust smoke. Your lawn mower’s carburetor regulates the ratio of gasoline to air mixture. Black smoke may indicate that the mower is “running rich,” or burning too much gasoline. Consult the owner’s manual for the exact type of oil recommended for your mower. ![]() Also note that using the wrong grade of engine oil may cause blue or white smoke. Continue to add small amounts of oil until the level matches the recommended “fill” line. ![]() Start checking the oil level with the dipstick after you’ve added about ¾ of the amount recommended in the manual. If the level is too high, drain the oil (consult your owner’s manual for instructions), then refill the reservoir with it. Then remove the dipstick once again and determine the oil level in comparison to the recommended “fill” line on the stick. To do this, remove the dipstick cap, wipe off the stick with a rag, and reinsert it into the reservoir. Photo: An overfull oil reservoir may also cause white or blue smoke.Įnsure you didn’t overfill the mower by checking the oil level with the dipstick located on the reservoir. If you tip the mower often for cleaning or maintenance, check your owner’s manual to determine the best way to reduce the risk of oil leaks. Solve the problem by restarting the mower and allowing the spilled oil to burn off. The smoke may look disconcerting, but it’s completely harmless. Similarly, you could’ve spilled oil on the engine by mowing on a slope greater than 15 degrees or tipping the mower on its side. If you’ve recently changed the oil in your mower and the engine is emitting white or blue smoke, it’s possible that some of the oil spilled onto the engine. White or blue smoke may indicate an oil spill on the engine. Consult your owner’s manual if you’re unsure how to access a specific part of your lawn mower’s engine. Keep in mind that all mowers with internal combustion engines contain the same basic parts, but the configuration of those parts varies widely, depending on manufacturer and model. A homeowner can usually identify the reason for a smoking lawn mower by gauging the color of the cloud coming around the engine, then fix it accordingly before lasting damage occurs. A: Your lawn mower can emit smoke for numerous reasons-many of which don’t require the services of an expert. ![]()
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