But before you panic, check if your mower is still under warranty to be repaired at the nearest servicing dealer. Any issue relating to a factory defect or poor workmanship might have its repairs covered with no cost to you, and some of the major lawn mower brands will make it right for you in some way.
If you have a good mower, this may be cheaper and a wiser use of money than buying a new mower. The unburnt fuel in the combustion chamber turns to smoke because of the lack of air circulation. With a push mower, your air filter is probably located on the side of the mower. If you have a foam filter in your mower, it can be removed and cleaned with soap and water.
Paper filters can be cleaned with a vacuum or compressed air. Some filters are disposable and need to be replaced with a new filter. I replace mine annually as part of my spring mower maintenance routine. Make sure there are no obstructions in the breather tube, which is located behind the filter.
This and the muffler can also clog if the filter is dirty. After removing the filter, use a wire brush to clean inside the pipe. After cleaning and replacing the filter, start the mower back up and let it run. If your mower starts back up, but black smoke persists, adjust the carburetor to make a leaner fuel mixture. You can have this done at a small engine repair service. Take the gasket off and use a tool to scrape off any hard to remove pieces of gasket but be careful not to damage the smooth surface when scraping off the debris.
Place the new gasket on the engine block and place the cylinder head back in place before bolting it back onto the cylinder head and putting the sparkplug wire on the sparkplug. You can purchase head gaskets here. Of all the causes of white smoke in lawnmowers a failed piston ring is probably the worst one and it is normally seen in older worn out lawnmowers or if the mower is poorly maintained.
Piston rings control the amount of engine oil and supply very little amount of oil to the piston in order to move smoothly inside the cylinder. But when these piston rings fail there is nothing to stop the engine oil from entering the combustion chamber and burning up to produce white smoke. Piston rings may get damaged due to any number of reasons but the most common ones include:.
If your mower is burning up a lot of oil and producing white smoke as it runs with very little to no power than it can mean that your mower has bad piston rings. Unfortunately repairing failed piston rings is not a simple repair and it will require a complete engine rebuild and the whole engine will need to be opened up.
If your lawnmower has bad piston rings then chances are the head cylinder will also have signs of damage and will need to be replaced as well. Here you can find lawn mower piston rings. If you own a 4 stroke lawnmower then mixing oil in the fuel of your mower is a big no. A lot of modern-day lawnmowers come with 4 stroke engines because they are more reliable and last a lot longer compared to 2 stroke engines. If the fuel you put inside your lawnmower had oil in it then as the lawnmower starts running it will burn the oil that has been mixed in the fuel and produce a lot of smoke.
And if you keep running the engine with engine oil in the fuel tank it can lead to damage and premature wearing of the engine. Depending upon how much oil got into the fuel tank you might be able to get rid of oil in the fuel tank by simply running the mower till it burns off the contaminated gas and then fill fresh clean gas in it. But if you are not certain about how much oil got mixed with the fuel and you want to be on the safer side then you will have to remove the fuel from the fuel tank and carburetor before filling it with new fuel.
On a brighter note, blowing smoke is not an indication of a serious issue with your lawnmower, but can turn into one if left unattended. Or, black smoke coming out of a lawn mower means that the ratio of fuel to air is incorrect, which is usually caused by a dirty or worn-out air filter.
Great chances are that the air filter may be clogged, and is blocking sufficient air flow to the carburetor. If the black smoke issue still persists after cleaning or replacing the air filter, then it may be your carburetor acting up, so you will have to make a couple adjustments.
White is the most common color of lawn mower smoke, and most of the time will go away on its own. An overfull oil reservoir will cause the engine to burn oil, which can be caused by one or more reasons.
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