A smouldering lawn mower is a bad omen. You don’t need a professional to identify and fix the problem if the smoke is blue, white, or black.

Q: When I turned on my lawnmower recently, it instantly began spewing black smoke, so I shut it off right away. What’s wrong with my lawnmower? Is there a risk of fire? So that I don’t injure the machine, I need to know how to proceed.

A:Numerous causes—many of which don’t necessitate the assistance of a professional—could result in the smoke coming from your lawn mower. Smoking lawn mowers are usually caused by a problem with the airflow surrounding the engine, which can be diagnosed and fixed before any long-term harm develops. Even though all mowers with internal combustion engines have the same basic components, the specific arrangements vary greatly from one brand or model to the next. If you’re not sure how to get to a certain part of your lawn mower’s engine, consult your owner’s manual.


White or blue smoke may indicate an oil spill on the engine.


A white or blue smoke coming from the engine of your lawnmower may be caused by oil leaking onto it after you’ve just changed the oil. By mowing on a slope of more than 15 degrees or tipping the mower over, you could have gotten oil on the engine. Despite its appearance, the smoke is harmless. Restarting the mower and allowing the spilt oil to burn off will solve the problem. Check your owner’s manual if you frequently tilt the mower for cleaning or repair to find out how to minimize the possibility of oil leaks.


An overfull oil reservoir may also cause white or blue smoke.


Check the oil level on the reservoir to make sure you didn’t overfill the mower. Using a rag, clean down the dipstick, then reinsert it back into the reservoir. Afterwards, take out the dipstick once more and check your oil level in relation to the stick’s recommended “fill” line. Refill the reservoir if the oil level is too high (see your owner’s manual for procedures). Once you’ve added roughly 34 of the required quantity of oil, you can use the dipstick to check the level. Once you’ve reached the appropriate “fill” line, apply a tiny amount of oil at a time. You avoid blue or white smoke, be sure to use the correct grade of engine oil. To find out what kind of oil your mower needs, refer to the owner’s manual.


Black smoke may indicate that the mower is “running rich,” or burning too much gasoline.


The carburetor of your lawn mower controls the mixing of gasoline and air. Adding too much fuel to the mixture can cause black exhaust smoke if the carburetor isn’t getting enough air. An air filter that’s clogged or unclean may be blocking adequate airflow to the carburetor.. Replace the air filter if necessary. See an example of an air filter on Amazon for a specific model of lawnmower.) Afterwards, give your lawn mower a few minutes of hard work. If the black smoke persists, it’s possible that the carburetor’s airflow needs to be increased. Either take the mower to a pro or use the instructions in the owner’s manual to adjust the carburetor yourself.

You can either hire a mechanic or follow the instructions in your mower’s owner’s manual to make the necessary adjustments to the carburetor.


Take your mower to a repair shop if necessary


It’s possible that your mower has a more serious problem, such as an air leak in the crankshaft (the cast iron or cast aluminum housing that protects the working parts of the engine). In addition, if the blue or white smoke persists, it may be a sign that certain engine parts or seals are worn out and need to be replaced You may also be dealing with a more significant technical problem if black smoke lingers after you have replaced the air filter and adjusted the carburetor. All of these issues necessitate the services of an expert. For free repairs, verify with the manufacturer if your lawnmower is still under warranty; problems caused by factory defects or poor workmanship may be eligible for compensation. If your mower is out of warranty, a professional small-engine repair shop should be able to fix it.

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