How to start a lawn mower

Why the grass trimmer gasoline does not start? Causes and their elimination

Agree that almost any problem with the trimmer can be solved independently, without resorting to the help of specialists. When the lawnmower won’t start, the causes and ways to fix the problem are at the very surface. You only need to conduct a thorough diagnosis of the device and identify the key causes of failure.

In this article, let’s look at popular causes of chain saw breakdowns and how to detect them. Here are recommendations for repair at home. To simplify the understanding of the process by beginners in this case, we will provide the material with clear photos and detailed video instructions.

Checking the fuel mixture

Suppose you do not start the trimmer for grass. In this case, the first thing to do is to check whether there is enough fuel in the tank, as well as to assess the quality of the fuel mixture. It is necessary to fill the motorized unit only with high-quality gasoline. It is recommended to use fuel, which brand is not lower than Ai-95. Filling the grass trimmer with fuel of unknown origin, bought not at the filling station, is fraught with the emergence of frequent failures in the work of the tool. This can cause a breakdown of the cylinder and piston system. Repair in such a case often exceeds the cost of the device itself.

Why does not start gasoline trimmer for grass? Incorrectly prepared fuel mixture, consisting of oil and gasoline, may also lead to this. Proportions, in which combine these components, are specified by the manufacturers in the instruction manual trimmer for grass. Preparing the fuel mixture is highly discouraged in large quantities, that is, for the future. After all, the loss of the defining properties of the substance occurs during prolonged storage. Therefore, if the grass trimmer does not start, it is worth to drain the old fuel and use a freshly prepared fuel mixture.

Prepare refueling. fuel mixture

When starting the device after the winter season or when it is located in a cold room, it is necessary to check the tank for the remains of refueling. If residue is found, it is necessary to drain the mixture.

Peculiarities of the refueling procedure:

  • The fuel may be either a ready mix or a self-made mix.
  • No need to prepare the fuel mixture when fueling four-stroke engines.
  • The machines work better with oils that have an SAE-30 index.
  • It is not recommended to change from synthetic oil to mineral oil and vice versa.
  • Chinese, Japanese, American gasoline lawn mower works better on A-92 fuel. European models accept high octane numbers well.
  • Be sure to monitor the mixture level, the best option is 2-3 centimeters below the edge of the fuel tanks.

The first thing to do is to check the availability and quality of the fuel

Do not understand why the lawnmower does not start, then initially make sure that there is fuel in the tank. Often beginners forget that they have to pause periodically to refill the tool with the petrol-oil mix. If the mower‘s tank is empty, of course it will not start, no matter how much you try to do it.

If there is fuel in the tank, but it is impossible to start the engine of the tool, then do not rush to disassemble the carburetor. Make sure to start the grass trimmer’s engine correctly, as specified in the manual. If the start-up is performed according to the instructions, then it is important to consider the following points:

  • Do not just use high-quality gasoline with the maximum octane number, but exactly the brand recommended by the manufacturer. And not always this brand is gasoline AI-95. If you don’t know what gasoline to use for your lawnmower, then choose AI-92
  • Oil must be special. for two-stroke engines. If the lawnmower has a four-stroke motor, then it must be filled with pure gasoline without stirring with oil. Do not skimp on the quality of engine oil for grass trimmer, as well as on gasoline. The life of the engine depends on the quality of the fuel used
  • Correct preparation of the fuel mixture in the gasoline trimmer. Observations show that most mowers only initially control the process of making oil with gasoline for the grass trimmer. The more experience a mower has, the less attention is paid to the process of mixing gasoline and oil for a two-stroke engine. The ratio of gasoline to oil should be as recommended by the manufacturer. Usually the ratio is 25 to 1, that is you need 40 ml of two-stroke oil for 1 liter of gasoline (you can not use engine oil for a car and moreover waste oil)
  • Correct storage of fuel mixture. it is often the case that after a fuel mixture has been prepared, it stands for a long time over 2 weeks. The ready mix of petrol and oil should not be stored for a long time, since it causes the oil to precipitate, and thus the properties of both petroleum products are lost. Even mixing it thoroughly after it has been stored for a long time is not a reason to continue using it. that is why it is not recommended to mix more than 2 liters of fuel at a time
start, lawn, mower

Make sure that all the above points are met, and only after that you can proceed to check the condition of the candle. Grass trimmer does not start for a variety of reasons, and most of them can be identified by yourself. It is simply not practical to disassemble the carburetor if you cannot start the engine. The next step in the troubleshooting process is to check the condition of the spark plug.

environmentally friendly mowers

The side effect of gasoline-powered machines is that they produce emissions that are not safe for the environment. Users are also familiar with the problem of fuel evaporation from an idle engine, which creates certain difficulties with the storage of gasoline equipment. Engine manufacturers are constantly improving technology to reduce these unpleasant phenomena to a minimum. Now there are new gardening equipment on the market with engines with record low emissions. In addition, these engines have eliminated the problem of fuel evaporation during idle time.

, that the lawnmower engine can be equipped with a set of technologies that simplify its use and maintenance. It is a little more expensive technique, but the cost is justified by the greater comfort in use. Engines with a number of listed functions are installed on petrol mower models of such reputable manufacturers as Husqvarna, MTD, AL-KO and others.

Victor Danilov, technical specialist of Moscow representative office

Trained users who buy a new lawn mower to replace an old one often say that an easy start function is a deciding factor in their choice, because they know what it’s like to pull the rope repeatedly while trying to start the engine. Therefore, if you are buying a mower for the first time, it is better to give preference to a model with an easy start. And for as long as possible, it’s important to follow the directions in the instruction manual and perform the maintenance.

Despite a fairly wide range of lawn mowers with different principles of operation, gasoline mowers do not lose their popularity. Their power and autonomy earned them respect among users.

For comfortable operation and absence of damage during the operation of the lawnmower, as well as other garden equipment of similar action: trimmers, brushcutters, is very important is the first start. Not paying enough attention to the preparation of the equipment for use can affect the quality of work or lead to damage to the unit.

What grass trimmer oil to use?

The oil for 2-stroke trimmer engines must meet slightly different standards than the oil for 4-stroke engines. Lawn trimmer oil must have a high combustion rate, so that it does not form soot on the internal parts of the fuel system (particles of soot can fall off and form scratches on the cylinder walls). Also, the 2-stroke oil should dissolve well in gasoline and be designed to operate at high temperatures.

Taking into account such serious standards, modern manufacturers of garden equipment produce a special line of 2-stroke oils, designed specifically for trimmers and brushcutters. Lubricants from manufacturers like Hado and STIHL are ideal for this machine, they’re very lubricating and have low flammability.

What cutting heads should be used for mowing grass with a chain saw

Two types of cutting heads or blades are used in the construction of chain saws. These are spools of fishing line, as well as steel or plastic discs. What’s the best choice for your power tool? The site provides information on how to choose discs and fishing line for trimmers, as well as their types and design features. Let’s briefly consider what types of cutting bits should be used on trimmers and petrol brushcutters.

    For mowing soft grass, a line is used for the trimmer, which is wound onto a reel or spool.line for the trimmer, unlike metal discs, is used where the grass grows near trees, houses, fences and other obstacles. The trimmer line allows you to mow grass near obstacles without disturbing the construction of the tool

The choice of cutter depends on where you use the tool. If it is planned to work in the homestead area, then the line for the trimmer is selected, and for mowing grass in the field or steppe, discs with 3-4 blades and more are used, as well as discs with fine teeth.

This is interesting!In most cases, cutters do not come with the tool, so the buyer can decide for himself what he needs. a line for the trimmer or a steel disc.

Taking care of your trimmer after work

Once you’re done cutting the grass, you’ll need to get your grass trimmer in order. The first thing you may need to do is mow along the lawn. Use a broom or broom for this, collect all trash and cut grass. If the area is very large, it is better to use a leaf blower. This will make the work much easier.

After that, you will need to get the grass trimmer in order. Remove any grass that may have become lodged in the hood, wipe down all cutting parts with a soft cloth. Cordless grass trimmer is placed on charge, gasoline trimmer is additionally charged. Store in a dry place.

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Let’s start the lawn trimmer running in

After start-up, do not rush immediately overturn the grass trimmer. Allow 5 minutes for engine to warm up at idle speed. While the engine is warming up adjust the airflow with the choke knob so that the line or blade bobbin does not rotate. Once the tool is warmed up, open the air supply by moving the lever to the “ON” position and squeeze the throttle trigger to 1/2 and hold for about 20 30 seconds. Then we drop the gas, let the trimmer work at idle 30.40 seconds. Continue in this mode for 1015 min. Then muting and letting it rest for 15 20 minutes.

After the lawnmower has cooled down, continue running in the engine according to the previous scheme. Start on a hot, grass trimmer should already be with an open air damper. Try not to hold the gas for a long time, because moving parts of the tool only rub against each other. Do not let the engine idle for a long time because it may overheat.

The next step is to run the gearbox of the gasoline grasshopper. To do this you need to choose a place with soft young grass. Mow for 510 minutes with starting 1/22/3 of full gas. After that we make a break for 20 25 minutes. Repeat the cycle 34 times.

In general, the lawnmower runs in accordance with the described algorithm until the fuel mixture in the tank is completely exhausted. Then you are ready to work for a long time. While working keep an eye on temperature conditions of gearbox and engine. They must not overheat.

How to start diagnosing a brushcutter

If the lawnmower won’t start or immediately stops after starting, all major components need to be checked one after the other. The check algorithm is as follows:

  • Fuel tank (fuel quality);
  • The spark plug and spark plug passage;
  • Air filter;
  • Fuel filter;
  • Breather;
  • Exhaust port.

These components are most often the source of major problems, which can be corrected after a thorough inspection.

Checking the fuel mixture

Before starting the engine of the gasoline grasshopper, check the presence, and quality of the fuel mixture. Don’t save, don’t be greedy and don’t be “clever” in this matter. Repair or replacement of the piston group will cost you too much (sometimes up to 70% of the cost of a new instrument). The oil-fuel mixture must be prepared strictly according to the instructions. Calculate the quantity of gasoline from your actual needs. Excessive gasoline, left after work, loses its quality over time.

Diagnosing the spark plug and spark plug duct

If the quality of the fuel mixture is not in doubt, but the lawnmower stops when starting, it could be due to a primed plug. A usual spark plug wrench (every motorist is sure to have one) and a spare spark plug will do for repair.

  • We unscrew the spark plug and wipe it;
  • Thoroughly dry it (do not burn it);
  • Excess fuel in the chamber drain through the spark plug hole and dry it;
  • Clean old candle from soot with a file or a lady’s file;
  • Set the gap with a distance of 1 mm (you can check with any coin);
  • Put everything back in place and try to start the grass trimmer.

The channel should be dry for at least 30-40 minutes. Otherwise there is a risk to re-fill and a new spark plug.

If the spark plug is working, the socket where it is located is completely dry, but the lawnmower does not want to start, lubricate the threaded joint. It should be slightly moist. No matter how good the spark spark may be, there is nothing to light in the dry chamber.

If the grass trimmer engine still does not start, you should rule out such a cause as a lack of spark due to poor contact between the spark plugs and the high-voltage wire. If the connection is good, but there is still no spark, most likely you have a “broken” ignition unit. Here without a master you can not do without, t. ะบ. The part is not repairable, but is sold as a complete unit.

Lawn mower filter diagnostics

Another reason for the gasoline grass trimmer to stall may be the air filter. To rule it out, try to remove the filter and start the grass trimmer without it. If it works, then you’ll have to change the air filter for a new one, or at least blow and thoroughly clean the old one.

The gasoline grass trimmer may not start due to a dirty fuel filter. This is the next step of our algorithm. Here check the condition of the filter element and if necessary replace it with a new one. When replacing, try not to leave the intake without a filter at all, this is prohibited by any instruction manual. Hurry may cause damage to the engine piston group.

Breather and exhaust port

Often “delicate” brand-name models of chain saws do not start and shut down because the breather plug is dirty. The main function of this element is to equalize pressure in the gas tank. When this unit is clogged, a vacuum is created in the tank and prevents fuel from flowing. The fault can be eliminated by cleaning the breather plug. An ordinary needle can be used for cleaning.

Normal operation of a combustion engine can be impaired by dirt in the exhaust port or by a clogged muffler screen. Such problem is more frequent on older models. The problem can be solved by traditional cleaning and removal of the anti-sparking grid.

complicated reasons of lawnmower failure

If the step-by-step troubleshooting algorithm failed, and your grasshopper still won’t start or stalls, it’s worth inspecting the carburetor and the engine itself. A clogged carburetor can be one of the causes of erratic operation of the tool. Three main problems can be identified here:

  • Clogging of channels or nozzles. This can be cleaned with special washes or with a powerful jet of compressed air from a compressor. Do not use needles and wire, as it can damage the passages;
  • Wear carburetor gasket. Exit. replacement of the failed gasket;
  • Loss of air tightness. To check this indicator, you can use an ordinary household tonometer, replacing it with a suitable pressure gauge. Watch the readings: if they do not change. everything is fine, and if the pressure begins to fall, it means that some part of the carburetor is defective. You have to find it and replace it with a new one.

If everything is okay with the carburetor, the gasoline grass trimmer may not start due to wear of the piston group. If you find chips, scratches or scrapes on the piston or cylinder, they must be replaced. The piston rings should be checked regularly. A slight play of the piston when rocking the connecting rod is an indication that it is time to change the rings. It is better to leave this procedure in a service center.

The grass trimmer does not start in the cold. remove the cause

at idle.The reason is air drainage, which prevents injection of fuel. In the chamber.

After a few jerks, it will start and stall, which is a normal phenomenon. What to do when the fuel was exactly normal, the spark is, but the gasoline weed trimmer does not start? After putting the choke in the working position, start the tool again and start working.

And again, the carburetor.

If your grass trimmer won’t start even after all this abuse, you can’t do without disassembling the carburetor. It could very well be that it’s all the fault of a trapped needle. Dismantling and flushing a capricious mechanism wouldn’t hurt anyway.

start, lawn, mower

In general, when the grass trimmer began to be capricious and stall, it is advisable to carry out a complete prevention: completely change the fuel mixture, try a different oil, as well as necessarily change the spark plug. Gasoline grass trimmer does not start? Causes and solutions on. Practice shows that in many cases it is cheap low-quality plugs that are to blame.

We looked at the most common reasons why the grass trimmer does not start. If it’s something more “exotic”, you can’t avoid a trip to the service center. Smaller and more obvious failures you will probably find yourself.

start, lawn, mower


The most popular models for 2021 are:

  • Gasoline mower pro Husqvarna LB 553Se. Speed 5 kilometers per hour. Country of manufacturer Sweden.
  • Champion LMH4412 lawn mower. Gasoline engine type. Brand Country Russia.
  • Lawn mower gasoline BEAR CAT Echo WT190. Volume of the fuel tank 1 liter. Manufactured in USA
  • STIHL FS 40 Autocut C 5-2 lawn mower. Processing width of 38 centimeters. Country of manufacture USA.
  • McCulloch Gasoline Lawn Mower M51-150R Classic. Power output 2 500 watts. Home of the brand USA.

How to start a moped after the winter with ether

How to start a moped after winter, it’s easy enough to do with ether, provided that the iron horse is not struck by another, larger scale failure. For this procedure, remove the air filter cover and spray a large volume of ether directly onto the filter part. Then close the cap quickly to prevent the ether from escaping.

Well and start trying to start, if the third time failed to start the engine, then you need the help of a good mechanic and the only way is the way to the service station. Well and if, an iron horse, “has made attempt” to sneeze, it is possible to repeat the given procedure.

It is also worth remembering that if in the fall the moped started and worked flawlessly, then all of the above methods will help you start your iron friend in the spring. Well, if your moped has had problems in the fall with the movement, then do not waste time, you need to take it to the self-service station.

start, lawn, mower

Of course, every owner of an iron friend should prepare his moped for winter, but not always it turns out, because of the banal negligence. And since in the spring there is no chance that the iron friend will start immediately, it is worth remembering all of the above methods that will help cope with this task.