How to Start a Gasoline Lawnmower Properly. Starting the lawnmower

Running in the engine of a brushcutter. Peculiarities of the lawnmower running-in

It should be noted that the gasoline lawnmower is very simple to operate. It’s enough to see how other users use this machine to start using it fully. Performing basic technical functions is intuitive and does not require any difficulties in practice. Proper running in of the gasoline grass trimmer is also not difficult. Not only that, there is almost no difference between units in the residential and professional categories.

The key difference is the motor type. On equipment for professionals, it is more powerful and produces more revolutions. Two-stroke engine more commonly used in domestic models. Four-stroke units are more reliable and deliver more power, so they are suitable for special conditions, difficult and overgrown areas.

start, gasoline, lawnmower, properly

Also consider whether or not the cutting attachment is included.


The cause of grass trimmer failure can be:

  • Overfilling the tank;
  • Excess fuel in manual supercharger engines;
  • Wear in the engine valves, cylinders, nozzles, cam tappets and other moving parts;
  • Petrol and/or oil runs out of gasoline and/or oil in the tanks;
  • Spark plugs are out of order;
  • Clogged fuel or air filters;
  • Improperly prescribed or burned valves in the engine.

The first thing to do is to check the availability and quality of 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 it is necessary to pause periodically to refill the tool with a gasoline-oil mixture. If the mower’s tank is empty, then of course it won’t start, no matter how many times you try.

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 that the grass trimmer’s engine is started correctly, as indicated in the manual. If you start according to the instructions, then it is important to consider the following points:

  • Do not use high-quality gasoline with the highest octane rating, but the brand recommended by the manufacturer. And not always such a brand is gasoline AI-95. If you do not know what gasoline to use for a lawnmower, then choose AI-92
  • Oil should be special. for two-stroke engines. If the lawnmower has a four-stroke motor, then it should be filled with pure gasoline without stirring with oil. You should not skimp on the quality of oil for the grass trimmer engine, just as you should not skimp on gasoline. The life of the engine depends on the quality of the fuel used
  • Proper fuel mixture preparation in a gasoline trimmer. Observations show that most mowers only initially control the process of making oil with gasoline for the grass trimmer. The more experience the mower has, the less attention is paid to the process of mixing gasoline and oil for a two-stroke engine. Adjust the gasoline/oil ratio according to the manufacturer’s recommendations. Normally the ratio is 25:1, that is you need 40 ml of two-stroke oil for every 1 liter of petrol (you must not use engine oil for cars, much less waste oil)
  • Correct storage of the fuel mixture. It often happens that after preparing the fuel mixture, it stands for a long time over 2 weeks. the mix of oil and gasoline must not be stored for an extended period of time, as it causes the oil to precipitate and thereby lose the properties of both products. Even a thorough stirring after a long period of storage of the ready mixture is not a reason to use it further. That is why it is not recommended to prepare more than 2 liters of mixture at a time

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

Recommendations for choosing a petrol lawnmower yourself

Almost all the advantages and disadvantages of different types of gasoline lawn mowers, we have provided above, in a brief description

I would still like to draw your attention to some design peculiarities of petrol lawnmowers. things to consider when buying a mower

So, professional gardeners give you the following recommendations on the choice of gasoline lawn mower:

When buying a petrol lawnmower, pay attention to the diameter of the wheels. The larger the diameter, the more maneuverable the machine will be, and therefore more comfortable the process of mowing the lawn

By the way, the width of the wheels should also be taken into account.к. narrow wheels will squeeze through the lawn, leaving unattractive marks.

The deck of the mower should be aluminum. In this case the mower itself will be lighter, more resistant to mechanical damage and corrosion. If you choose a machine that is not powerful enough, the grass catcher box should be plastic, t.к. it will be easier to clean the container from the grass. Give preference to mowers with folding rubberized handles

They are easier to transport and vibrations from the engine will be less felt. Mowing height should be adjustable with a central lever, it’s more convenient and will allow you to mow the lawn more evenly across the site. Pay attention to the mower’s executive body. the blade. It should be sharp and preferably wide

In this version, the mower will mow the grass more qualitatively. Choose a petrol lawn mower. The wheels of the lawnmower are on bearings, t.к. Conventional plastic bushings fail faster and are less resistant to mechanical damage. Not to mention the power of the engine. Based on the size of your property, choose an engine with enough power to cut the grass in all weathers. We draw your attention to the fact that self-propelled lawnmowers take part of the engine power to make the movement, it is also necessary to take this into account. Give preference to such manufacturers as Honda, Hitachi, Craftsman, VIKING, MTD, STIHL, Husqvarma, Stiga, Makita, etc.д. Pay attention to the engine manufacturer of the gasoline lawnmower, the leaders are Briggs Stratton and Honda.

Noteworthy articles: What to do if gasoline lawn mower does not start? The necessary material on the web site of gardening equipment and tools store “Gardener”

Step by step instructions on starting up

To easily start a lawn mower, it is necessary to read the step-by-step instruction in detail, but it is also necessary to take into account the rules of fueling the device, as well as many other important nuances.

Only gasoline models need to be filled before starting as their engines won’t run properly or won’t start at all without the right fuel. Therefore, after studying in detail the technical characteristics of your appliance, it is also necessary to read the information about ready-made fuel or the preparation of a special mixture with your own hands.

In the latter case, it is necessary to comply with the proportions that are specifically designed for the proper functioning of the mechanism.

Sometimes synthetic oils are used for this purpose. These types of fuel mixtures have a lower cost, but practically do not differ in their qualitative characteristics. For 100 grams of synthetic oil, 5 liters of gasoline must be applied, so the mixture will have proportions of 1: 50.

Mixtures with mineral oils have a higher price, because they are considered more natural and environmentally friendly, but in terms of technical characteristics they are only slightly superior to synthetic variants. The proportion when using such materials will be 1: 35, i.e. 3,5 liters of petrol should be used for 100 grams of oil.

There are also variants of petrol lawnmowers where the fuel tank is located separately from the oil sump, so there is no need to mix.

But regardless of the model and type of fuel tank refueling should be done in the same way. fill the fuel not completely, but leaving 3-4 centimeters to the edge of the tank.


Depending on the model of the lawnmower, starting up will be carried out in different ways. Therefore, it is necessary to take this into account and, comparing with the individual technical characteristics, proceed to connect the device and start the engine.

And if with the manual model, working on the principle of the usual grass mower, everything is quite simple, then when starting the gasoline model, there may be some difficulties.

start, gasoline, lawnmower, properly

A petrol lawnmower can be started in two ways. with the engine unheated or with the engine warmed up.

start, gasoline, lawnmower, properly

Before starting an unheated engine, take care to disconnect the ignition system and transmission, and crank the motor shaft with the starter lever or starter. After that, you can proceed to the start, acting as follows:

  • first the ignition must be switched on;
  • then the choke shutter must be closed
  • After that you can safely start the engine.
start, gasoline, lawnmower, properly

After starting it is necessary to set the idle speed on the device using the throttle lever. Then, using the same lever, you need to move the device to work at low speed, thereby giving the engine the opportunity to warm up. After that you can safely start the lawnmower at full power. It is worth noting that starting the device with an unheated engine is acceptable, but further operation in this state is undesirable, as it will adversely affect the overall condition and functioning of the lawnmower.

It is much easier to start the lawnmower with the engine warmed up, as this process does not require any prior preparation. The actions should be performed in the following sequence:

  • The control lever should be switched to the fuel supply mode at the maximum level;
  • Then it is necessary to start the engine;
  • then you can choose the desired speed and start working.

These recommendations are suitable for any model, including manual lawnmowers, which work on the principle of the usual grass mower.

How to start after winter?

To start the lawnmower after the winter period can be quite difficult, because most often devices of this kind are stored in barns, where no heating is provided, and therefore exposed to the harsh winter climate, and sometimes to sudden changes in temperature. That is why it is necessary to approach this process wisely and take into account all the important nuances.


The most popular models for 2019 are:

  • Husqvarna LB 553Se gasoline mower pro. Speed 5 kilometers per hour. Country of manufacturer Sweden.
  • Champion LMH4412 Lawn Mower. Petrol engine type. Brand Country Russia.
  • BEAR CAT Echo WT190 petrol mower. Fuel tank capacity 1 liter. Country of production USA
  • STIHL FS 40 Autocut C 5-2 lawn mower. The working width is 38 centimeters. Country of production USA.
  • McCulloch M51-150R Classic gasoline mower. Power output 2,500 Watts. Home of the brand USA.

Lawn Mower Will Not Start?.This is Probably Why! ‘Simple Fixes’

How to start a lawn mower

Often, the use of garden tools begins with the fact that you have bought a mower with all the necessary accessories and are already ready to look at it in action, so, most likely, the obvious next action is to pull the cord. All the right way!

But sometimes this is not enough, depending on the brand and type of device, all models wind up differently. Here are some general tips on how to start your lawn mower, and the reasons why it may not start.

The first thing to do before starting is to charge the machine with fuel and check the oil level.

There are cases when the user simply forgot to do it. In such cases pulling the starter rope for hours on end will not work! In order not to waste time on futile attempts, we tell you how to fill the lawnmower:

  • Open the fuel filler cap, fill it up to the mark. If there is no mark, but fill up to the neck, do not overfill.
  • Check the oil level. If it is not enough, you will soon ruin the engine with this kind of operation, so it is better to top up. As a rule, oil is poured through the cap on top of the housing (it often says “oil” or has an oil can mark on it).

It is important to know that many mowers, especially those with two-stroke engines, need an oil-fuel mix. This is your case. read the manual carefully!

The next step is to prime the fuel pump.

To do this, find a soft cap near the spark plug, usually in red or black. Found it? Great, push it 4 or 5 times to fill the carburettor with fuel. Do not overdo it or you will flood the engine.

Don’t worry if you didn’t find one, it is not present on all units, so you will have to open the choke fully.

Read more: How to make a lawn mower from an angle grinder

The spark plug is located near the engine and can be identified by its rubber cap. Make sure the cap is securely in place.

This action is needed to move the throttle lever to the middle or extreme position. Otherwise, not enough gasoline will be supplied to the engine.

Be careful when starting up! Most new mowers are made with a safety switch that is important to hold when starting. If you don’t have one, make sure the machine is standing firm.

Support the lawnmower with one hand and sharply pull the starter rope up with the other. There is nothing wrong if you had to do it a couple of times before the technique starts, with experience the number of attempts will be reduced.

Common mistakes

When starting such a technical unit, there may be some problems, and to understand why the lawn mower does not start, you need to identify the causes, and for further work. to eliminate them.

Top Reasons Lawn Mower Not Starting — Lawn Mower Troubleshooting

The main reason for malfunctions when starting a lawn mower may lie in the fact that there is no gasoline in the fuel tank or its quantity is insufficient to operate the device. In such a case, the obvious thing to do is to fill the tank with fuel, and to prevent such a situation, it is necessary to check the availability of gasoline in advance.

Non-compliance with the rules of preparing fuel mixtures, as well as the use of low-quality raw materials in order to save money can also lead to errors during start-up and operation of the lawnmower. The way out in such a situation is simple. you need to carefully choose ready-made fuel, as well as carefully observe the proportions in your own preparation of mixtures.

Faulty starting may be caused by fuel which can clog the spark plugs. This is caused by the starter rope being pulled for a long time with the choke closed. To prevent this you should always check it and return it to the right position if necessary.

Naturally, if you start the lawnmower with the ignition off, you may fail, because without this, the functioning of the device is impossible.

That’s why right after fixing the choke, don’t forget to turn the ignition switch on, and only then you can start working.

Quality repair of petrol lawnmowers at the service center

Our service center repairs lawn mowers of the following manufacturers:

  • Husqvarna,
  • Hitachi,
  • STIHL,
  • Craftsman,
  • AL-KO,
  • Champion,
  • Partner,
  • Makita,
  • Honda,
  • DDE,
  • MTD,
  • Oleo-Mac,
  • Hammer,
  • Efco,
  • TEXAS,
  • Profi,
  • Homelite.

Our service center repairs lawn and gasoline mowers of any models. In our arsenal we have a large stock of spare parts, which allows us to perform works in the shortest possible time. Addressing in our service center you will get a high quality repair of lawn mowers on a high professional level! Our specialists have already made a lot of lawn mower repairs since they started working at our service center.