Reasons why a gasoline lawn mower won't start

Often, when working with a gasoline lawn mower, even regular users who know how to repair this or that device complain about problems with the equipment. And this is not surprising: petrol the engine has many elements, and using it, as they say, is a whole science.

Important! When attempting to repair the engine yourself without the help of services designed for this, the warranty expires.

Visual inspection

Before working with any faulty device, you need to conduct a visual inspection - one that does not require complete disassembly of the device. Agree: it is much easier, for example, to check the battery of a phone whose screen has suddenly stopped working by connecting it to the power supply, instead of completely disassembling the display, checking the cable, etc. So:

1. First of all, we check whether there is the required amount of gasoline inside the engine. If this is the reason, then there is no need to perform the remaining actions (and so on with each item).
2. We inspect for the possibility of gasoline or oil leaks. This should be done in good lighting or just use a flashlight.
3. Let's see if the motor has external deformations.

Engine problems

Common causes and solutions.

A common problem is Air filter contamination. Let's take it off. If the motor starts to work better without it (this can be determined by the sound), then the reason has been found.If, when closing the hole with your hand, the engine slows down, this additionally confirms that the problem is that the filter is dirty. It is recommended to replace it with a new one. You can also clean it with a vacuum cleaner or wash it thoroughly with a cloth using dishwashing detergent or the same soap. The main thing is thorough subsequent drying. Afterwards, you need to very carefully lubricate the filter with oil and leave it for half an hour to absorb.

If the engine runs but slows down, it may be the culprit spark plug. Problems with this element are also indicated by high fuel consumption. You can check it using a special “gun”, which is sold in any car store. To do this, insert the candle into the hole. If after this there is no spark, it means the element is not working - you just need to buy a new one and replace it.

Checking breather. This is an engine part that serves to maintain equal pressure in the gas tank. If it becomes clogged, a vacuum will most likely be created, which prevents fuel from flowing further. To check, you need to dismantle it, and then close the hole in which the breather was located with your palm. If there is no pressure, then that is the problem. Then clean the breather itself and reinstall it. If the motor still does not start working, it may be the rings. They should be checked using a compression gauge. Before checking, we warm up the power unit: if the atmosphere is not enough, we change the rings.

Broken flywheel key may also indicate problems with the engine. Its deformation is very easy to see during external inspection of the part. If it is broken, replace it.To check, the first thing you need to do is disconnect the spark plug wire and secure it away from the spark plug itself. Remove the casing by unscrewing the bolts. We install the flywheel puller and remove it along with the key. If deformation is detected, we replace the spare part.

If the engine starts but immediately stalls, this may indicate damaged insulation of the ignition system. So, touching the metal of the case, the current passes further, a short circuit occurs, which extinguishes the spark.

The problem may also lie in the quality of the fuel. The first thing you need to check is whether there is an excess of oil, then the gasoline itself. On fuel in no case no need to save! You can check its quality in three ways:

• By color. To do this, you need to pour fuel into a small transparent jar. If the color of gasoline is pale yellow, then it is in perfect order - the one that is needed is selected. If the shade is different, this may indicate cheap impurities. They quickly damage the engine, which means that it will have to be taken to the nearest service center.
• It involves using potassium permanganate. We also pour it into a jar and dilute it with potassium permanganate. If the fuel quickly turns pink, it means there is a large amount of water in it that shouldn't be there.
• Drop some gasoline onto a piece of paper. Wait a couple of minutes: if it has not completely evaporated, and the paper has changed its color, there are impurities in the fuel.

If your lawnmower smokes heavily, this may also indicate that the gasoline is prepared for two-stroke engines. Next time you just need to choose it wisely, and before that you should change the spark plug.

If the shaft does not rotate, then the problem is in “oil starvation” - lack of oil in the engine.In addition, the oil may be of insufficient viscosity. To repair the crankshaft, the pan must be completely dismantled. The bearings need to be replaced. Additionally, it is recommended to clean the channels if there is dirt in them. It can also negatively affect the lack of oil to lubricate parts.

If the spark plug is wet, it is possible carburetor problems. When the gaskets wear out, they should be replaced. You also need to wash it by partially disassembling it. First, remove the air filter and cover. Afterwards, we remove all the contaminated elements and completely wash them so that they look like new. Then we put everything back together. The parts need to be soaked in a cleaning liquid that can be purchased at the store. It can also be replaced with pure gasoline or kerosene. If necessary, the carburetor can be blown out.

The above recommendations in most cases help to cope with a malfunction in the trimmer. However, it should be noted that the most effective way would be to simply return the device to a service center.