The Ratio Of Oil To Gasoline In The Lawn Mower

Oil selection and fuel mixture for lawn mowers

The Ratio Of Oil To Gasoline In The Lawn Mower

So, have you finally become the owner of a petrol lawn mower or lawn mower? And your imagination is already creating images of how you courageously cope with the thick grass. However, the dream of a “perfect lawn” remains a dream, when the question involuntarily arises: what oil to use and what are the proportions of mixing it with gasoline?

You can find a lot of information on the correct preparation of the fuel mixture on the Internet. This topic is actively discussed on forums and other thematic resources. But, despite such an active discussion, there are many inconsistencies that have to be dealt with.

It doesn’t really matter what technique is used, it could be a lawn mower. lawn mower or chain saw. They are united by one. two-stroke gasoline engine. Unlike the 4T, it has an oil sump. To feed it, it is required to prepare a special fuel mixture consisting of gasoline and oil. The resulting liquid is fed directly to the engine (carburetor). During use, all actively working parts are thoroughly lubricated, contributing to trouble-free operation under any operating conditions.

Lawn Mower Engine Oil

Depending on the chemical composition, lubricants are divided into the following main groups:

Mineral. They are made on the basis of oils obtained from petroleum distillates. They are characterized by high viscosity and require frequent replacement. The material is intended for low power appliances with an air cooling system. Recommended for warm weather.

Semi-synthetic. They represent a kind of “golden mean”. They are based on a mixture of mineral and synthetic oils. A similar lubricant can be used in 2T and 4T engines, gardening and other equipment with air and liquid cooling.

Synthetic. They are made on the basis of special synthetic components containing esters. They are characterized by low viscosity and long service life. They can be used all year round, regardless of temperature conditions. Ideal for challenging heavy duty equipment with constant variable performance.

Any two-stroke oil, due to its 20% solvent composition, mixes well with fuel and has the feature of complete combustion. Their second characteristic feature is the color, which can be green, red or blue. Of course, this is not to say that some lubricant is better, but some worse. This is done solely so that it is convenient for the user to distinguish oil from pure gasoline.

Classification of engine oils:

The required parameters of oils for 2T engines are prescribed in the requirements of API TC JASO FC, API TC JASO FC ISO GD and API TC JASO FC E-GC. The most widely used classification systems are API. Based on this, 2T engine oils are divided into 4 large groups:

TA. Suitable for household appliances with an air cooling system and an engine volume of 50 cm3 or less.

TB. used for more powerful equipment with an air cooling system and an engine size of 50 200 cm3.

TC. It is used in technology with high demands for oil quality. It is a high quality lubricant for two-stroke engines with a volume of 50-200 cm3. Great for lawn mowers, lawn mowers, trimmers, chain saws and second garden equipment.

TD. For liquid-cooled outboard motors.

Most suitable material for 2T motors of API-TB and API-TC class. However, it is necessary to refer directly to the product passport, where the manufacturer indicates the brand of engine oil recommended for its equipment.

Important! For lawn mowers, lawn mowers and other 2T gardening devices, there is a special engine oil for two-stroke engines with an air cooling system and the mark “for gardening equipment”. Do not use lubricant for 2T liquid-cooled engines. Also recommended oil for outboard engines, motorcycles and other equipment.

Oil to gasoline ratio for lawn mowers: why precision is so important?

All of us in childhood loved to “cheat”, so the process of preparing a fuel mixture is not only simple, but also interesting. First of all, it is worth considering the fact that the proportions of the mixture may be different. This depends on engine configuration, oil markings and manufacturer recommendations. The fact is that with an insufficient amount of lubrication, the cylinder and piston heat up, which leads to shallow scuffing of all rubbing surfaces and, consequently, to the failure of the cylinder. Piston group. Well, in the case of its excess, on the contrary, we get coking of the piston ring and the formation of a large amount of carbon deposits.

And even despite the fact that there is a generally accepted mixture ratio of 2% (for every liter of gasoline, 20 ml of lubricant). The proportions in the mixture are still recommended to be kept exactly.

How much to pour oil into gasoline for lawn mowers?

Everything is quite simple, with the correct balance, the engine runs at full capacity, all parts are thoroughly lubricated and do NOT wear out. As a result, we get a confidently working technique that will last more than one season.

To know how much oil to add to your lawnmower, you need to familiarize yourself with the performance of the product. Proportional ratios can be represented as follows: 1:25, 1:40 and 1:50, which means 1 part of oil for 25, 40 or 50 parts of gasoline.

1 liter of gasoline = 1000 ml

To determine the required amount of oil for a ratio of 1:25, you need 1000/25 and we will get a ratio of 40 ml.

We carry out the same actions for the ratio 1:40 and 1:50:

1:40 (for 1 liter of gasoline 25 ml of oil)
1:50 (for 1 liter of gasoline 20 ml of oil)

To ensure the correct proportion of lawn mower oil, it is recommended to use a special measuring container (not plastic). Eliminate the possibility of dirt and water getting into the fuel mixture. This can affect its quality. It is better to start preparing the mixture with gasoline. Pour it into the required mark, then add oil. A couple of tilts of the container are sufficient for mixing. The liquid quickly combines and acquires a uniform shade, which, depending on the structure of the oil, can be red, green, blue or other. After that, a properly prepared mixture is poured into the equipment fuel tank.

Before using the technique, make sure that the tank cap is tightly closed. If you have more fuel, then the remainder can be stored in a special Canister or mixing container (no more than 14 days). It is recommended to drain the unused fuel.

Important! Be sure to follow the safety instructions. We mix liquids in an open area so that caustic gasoline fumes DO NOT accumulate in the room. Wear gloves and long sleeves. Do not smoke or ignite anything.


Gasoline with an octane rating of AI-92 is considered the most popular type of fuel for two-stroke engines. Due to its low cost, it is extremely rarely falsified. Therefore, not one hundred percent, but you can be sure of its quality. It is also permissible to use AI-95 fuel.

As for the storage of fuel, its period should NOT exceed 3 months. Over time, gasoline loses its properties, the resin becomes higher and a polymerization process occurs, which adversely affects the combustion chamber. The fuel mixture for lawn mowers made from low-quality materials settles in the form of carbon deposits, as a result of which the main components and systems of the engine suffer.

Recommendations for use and storage

The fuel is ready, poured into the fuel tank, the first spurt and the long-awaited start. However, if you want the equipment to work as long as possible, it is recommended to run it for the first time. To avoid overheating the engine, it is recommended to adhere to the average load. After the main elements of the system are thoroughly lubricated, the load can be increased.

Certain rules should also be followed when preparing the braid for off-season storage:

Drain the remaining fuel from the fuel tank and carry out the final run until the fuel is completely depleted. Then, Pause operation and make sure the engine is completely cool.

Unscrew the spark plug carefully and add about 5 ml of lubricant. Pull the starter handle slowly to distribute the oil evenly inside the engine. Then, return the candle to its original state. Store equipment in a cool dry place.


How much oil to pour into gasoline. mixing rules

Having figured out how much oil to pour into gasoline, you can start preparing the fuel mixture. This will require a clean metal or plastic canister. First, the required amount of gasoline is poured, and then the lubricant is added in the required volume. Finished dilution, tilt the canister a couple of times.

As a result of repeated shaking, the liquids are mixed, and the prepared fuel acquires a uniform color. Depending on the color of the added oil, the finished liquid may be greenish, bluish or reddish.

When performing work, safety precautions and fire regulations should be observed. Mixing work must be carried out in a ventilated area, and even better outdoors. Do not smoke when working with flammable liquids. Mixing must be performed with gloves to protect the skin from aggressive liquids.

The prepared mixture fills the fuel tank and the gas tank cap is tightly closed. Gasoline mixed with oil can be stored in a tightly closed canister. Gasoline mixed with oil retains its properties for a month.

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What oil to dilute gasoline for a motorcycle

In two-stroke engines, there is no separate filling of lubricant into the crankcase.

Strict requirements are imposed on oil that burns together with fuel:

  • The lubricating fluid must provide effective lubrication of all parts;
  • The oil should burn easily and should NOT form carbon deposits after burning.

When deciding on the type of oil, one should be guided by the recommendations of the manufacturer of the equipment specified in the operating manual. Preference should be given to branded oils from reputable manufacturers. The preferred oil grade is API-TB. It is also possible to use oils with API-TC marking.

The choice of the type of lubricant is carried out depending on the climatic conditions:

  • In the warm season, gasoline can be diluted with mineral oil;
  • In the winter months, synthetic oils should be preferred;
  • For all-season use, branded semi-synthetics are suitable.

The recommendations of the manufacturer of the equipment should be guided by determining the type of oil

To obtain detailed information on the temperature threshold of use, read the information on the packaging container of the oil. Knowing the ratio of fuel and oil required for stable engine operation, as well as the volume of the gas tank, you can easily calculate how much oil is required for a certain period, taking the frequency of trips or using a gasoline tool.

When buying oil for preparing the fuel mixture, you should pay attention to its purpose. This information is indicated on the packaging. It is unacceptable to use tractor oil or boat lubricant for mixing with gasoline to refuel a scooter or motorcycle. Please note that on the brand label of oil for two-stroke engines it must be marked 2T.

Why you need to mix gasoline with oil

But not everyone knows how to dilute gasoline for a two-stroke Chinese scooter, and why it becomes necessary to mix gasoline with oil in strictly defined proportions. The fact is that the design features and the principle of operation of a two-stroke engine do not allow the use of pure gasoline for its operation. Thanks to the oil introduced into the fuel mixture, lubrication is carried out and friction in the crank mechanism is reduced.

Diluting gasoline with oil allows:

  • Increase the service life of the power plant;
  • Provide effective lubrication of rubbing parts;
  • Avoid seizure of engine parts due to overheating;
  • Prevent Potential damage during motor operation.

In addition, the use of gasoline, mixed with oil in the required percentage, avoids the appearance of scoring, which are a prerequisite for repairs. Lack of oil can cause overheating of the elements of the cylinder-piston group and the failure of the two-stroke motor.

An increased concentration of oil will cause increased wear of the motor apparatus due to the formation of a thick layer of carbon deposits. That is why it is important to determine the proportions, Using the table, which indicates the required amount of oil for different volumes of gasoline.

The reason for the formation of carbon deposits in the working chamber is the use of low-quality oil.

Features and working principle of 2t engine

Any owner of a motorcycle should have an idea of ​​the design of the engine and the principle of its functioning. The two-stroke type power unit is used not only in motor vehicles, but also in other technical devices. lawn mowers, trimmers and others. Despite the complete set of many models of modern technology four-stroke, the two-stroke engine is still widely used. It is easy to operate, easy to maintain and repair, and also quite reliable.

The working cycle of such an engine is carried out in a couple of compression strokes and a working stroke as a result of the energy from the ignition of the fuel. Both cycles are carried out during one crankshaft revolution. The two-stroke engine lacks the fuel mixture intake phase and exhaust cycle typical of four-stroke engines. The process of fuel intake and exhaust gas exhaust occurs during the compression and expansion phases.

Thanks to this design feature, the torque and the power developed by the motor increase with the same cubic capacity as a 4-stroke motor. And although the efficiency of a two-stroke power plant is lower compared to a four-stroke, due to the two-stroke operation of the piston, the engine elements perform fewer movements. Provided high-quality lubrication of the mating parts of the motor, it has a sufficiently long service life and is less prone to internal wear.

For two-stroke operation, you must turn on the ignition, provide fuel and turn the engine crankshaft with a starter or kickstarter.

Further operation of the two-stroke motor is carried out according to the following algorithm:

  • The piston begins to move towards the spark plug from bottom dead center. At this time, the fuel mixture enters the cylinder working chamber. The exhaust port is opened for the exhaust gases and the working mixture is compressed;
  • In the initial phase of the compression cycle, a pressure drop occurs in the chamber of the crank mechanism, contributing to the flow of a new portion of gasoline. In the upper phase of the piston movement, the working mixture is ignited by a spark from a candle;
  • The energy resulting from the ignition of gasoline forces the piston to move to the lowest point. Thanks to the open channel of the outlet port, exhaust gases escape through the elbow connected to the muffler;
  • Subsequent piston movement causes the purge passage to open and gasoline to flow into the cylinder working area. The phase of displacement of the piston to the bottom point completes the engine operating cycle and the cycle repeats.

In the process of supplying gasoline mixed with oil, the components of the power unit are lubricated. This distinguishes the lubrication system of a two-stroke motor from the lubrication system of a four-stroke, which has a gear pump for supplying oil to the area of ​​the mating parts of the motor.

Oil mixed with gasoline is lubricated in the crank mechanism

What should be the ratio of oil to gasoline in a scooter and a motorcycle?

Owners of scooters and motorcycles, as well as owners of gasoline-powered tools with a two-stroke engine, are faced with the need to fill the fuel tank with a pre-prepared mixture of gasoline and oil, maintaining the required proportions. Motorists know that they cannot refuel equipment with a two-stroke power unit with pure gasoline. This will adversely affect the operation of the motor, its resource and lead to inevitable breakdowns. The oil-gasoline table will help you determine the correct ratio of the amount of fuel and lubricant.

Let’s take a closer look at the principle of operation of two-stroke engines, figure out the mixing proportions, as well as the rules for preparing the fuel mixture.

Oil gasoline table. choose the right proportion

Novice motorcycle owners do not always have an idea of ​​how much oil to add to gasoline. Depending on the manufacturer’s recommendations specified in the instructions, the amount of lubricant added may vary. The most common ratios are 1: 50 and 1:40. Minor deviations from the indicated proportions will NOT affect the operation of the two-stroke engine.

Dealing with the proportions is not difficult. For example, a ratio of 1:50 means that a liter of lubricant should be added to 50 liters of gasoline. The use of measuring containers will greatly facilitate the process of preparing the mixture. Depending on the volume of the available container, the amount of added oil changes.

In particular, for a ratio of 1:50, the table will help determine the volume of oil injected:

  • To dilute 5 liters of gasoline, you will need 100 ml of lubricant;
  • You will need to pour 200 ml of oil into a ten-liter container;
  • 400 ml of grease should be added to a 20 liter canister.

How to determine if the mixing ratio is out of order

There are a number of indirect signs by which you can determine the discrepancy between the amount of gasoline and oil when preparing the mixture:

  • Formation of contamination in the float chamber and carburetor channels;
  • Significant resinous deposits on the elements of the fuel system;
  • Oxidation of carburetor walls and reduced elasticity of rubber parts.

Any of these signs indicates the need to adjust the mixing process. Observing the proportions recommended by the manufacturer, it is possible to ensure a long service life of a two-stroke engine, as well as to avoid unforeseen and, at times, expensive repairs.

Fuel mixture: the proportion of oil and gasoline for the chainsaw

The chainsaw engine is the “heart” of the tool, so it is very important to use a properly prepared fuel mixture.

The fuel mixture for a chainsaw is prepared from two components. oil and gasoline. Chainsaws are equipped with two-stroke engines, so oil is not added to the lubrication system (as in a four-stroke engine), but directly to gasoline. At the same time, it is very important to observe the correct proportions of ingredients, of course, in no case should you try to work on pure gasoline, because in this way you will very quickly “kill” the chain saw.

If we talk about what kind of gasoline to pour into the chainsaw, then it will be optimal to use fuel with an octane rating of A-95, in this case the savings on fuel can turn out to be deplorable. Often European manufacturers indicate that it is possible to use A-90 or A-92 gasoline, but in the post-Soviet countries the quality of gasoline is inferior to European, therefore, in our realities it is better to use higher quality gasoline.

As for the proportion of the oil-oil mixture itself, everything is simple here: you must follow the instructions for the tool. All manufacturers of chainsaws indicate the required ratio in the instruction manual or in the passport of the tool, in addition, the proportions for refueling the chainsaw may differ depending on the model of the chain saw. As a rule, the proportion of oil and gasoline to a chainsaw of famous manufacturers is a ratio of 1:40 or 1:50, which means 1 part of oil for, for example, 40 parts of gasoline. Now arithmetic 1 liter of gasoline = 1000 ml of gasoline, divide by 40 and we get 25 ml of oil. If you do the same to a 1:50 ratio, you get 20 ml of oil per 1 liter of gasoline. As for budget chainsaws made in China, the situation is slightly different. The ratio of gasoline to chainsaw oil made in China 1:25, that is, divide 1000 ml of gasoline by 25, we get 40 ml of oil. The thing is that in branded chainsaws, a solid assembly and the distance between the pistons and cylinders in the engine is much less than in Chinese chainsaws, therefore the required amount of oil differs almost twice.

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In order to measure the correct amount of oil, use a conventional medical syringe of sufficient volume.

Another subtlety. Fill the dry gas canister with gasoline first and then oil. The procedure, on the contrary, is fraught with a low quality fuel mixture, because the oil is denser, it will stick to the bottom of the canister. what a good mixing here.

Be sure to prepare the fuel mixture in the Canister and fill the ready-made special fuel into the gas tank! Never ready and DO NOT mix it directly in the fuel tank of your chainsaw!

If you figured out the question of how to breed gasoline for a chainsaw, then on storage conditions and shelf life of the fuel mixture it is worth saying a few words. It is best and easiest to prepare a petrol-oil mixture for 1 liter of gasoline, it is recommended to do this immediately before working with the tool. Chainsaw fuel tanks have a volume of 0.3 to 1 liter. In the conditions of domestic use, the entire volume of the prepared fuel mixture is rarely used in one session, so the remainder can be saved until the next session. It is necessary to store the fuel mixture in a special Canister for gasoline, in a dry, dark place. It is optimal to count that the shelf life of the finished mixture will be 7-10 days. The fact is that the oil on the market now is NOT synthetic, but organic, that is, natural. After 10 days, all lubricating properties are lost, gasoline simply “eats” the oil. Naturally, it is no longer possible to use such fuel, this can cause breakdown and failure of the chainsaw.

At the end of the work, it is necessary to drain the fuel mixture, start the chainsaw, the tool will stall (so that there is a dry carburetor in the saws) and now you can leave it in the next operation session.

Unsuitable fuel mixture must be disposed of.

Proportion of oil and gasoline for a two-stroke gasoline engine

Many summer residents and villagers have tools with gasoline engines. To obtain a high specific power (the number of HP from 1 kg of device weight), two-stroke internal combustion engines are used from the power plant. All clock cycles are performed in one working stroke.

A special lubrication system, which is necessarily present in four-stroke engines, is not provided for in simplified designs. Therefore, the fuel mixture (TC) consists not only of combustible parts, but also a lubricating component.

Users sometimes have questions about how to properly prepare the vehicle for existing devices. For INDIVIDUAL ICEs, manufacturers indicate different ratios between gasoline and oil. In recent years, oil producers have begun producing not only mineral oils, but also semi-synthetic and synthetic oils for two-stroke engines can be found in the trade network. The question arises: “Which motor oils should I give preference to?”

Mixing ratio of gasoline and oil

In the operating instructions for two-stroke engines, you can read in what proportion the components of the fuel mixture (TC) should be mixed.

  • For motorcycles with a power of over 10 HP, it is recommended to prepare a vehicle in which the oil will be 1: 20 part. At the same time, it is noted that during the engine break-in period, the proportion should be more saturated, and be 1: 15.
  • For small tiller engines, the proportions are different. It is recommended to run in by creating a mixture in a ratio of 1: 20. In the future, the internal combustion engine is operated, maintaining the TS at 1: 30 (35).
  • Chainsaws are operated at the second ratio of oil and gasoline. 1: 40 (running in) 1: 50 (subsequent operation).
  • Small trimmers and gasoline scythes require much less engine oil. A constant ratio of 1: 50 is recommended here.

Gasoline and oil for two-stroke internal combustion engines

Modern engines operate at high compression ratios. Compression ratio means the ratio of the total volume in the cylinder to the compression volume when the piston is in the VMP. The designers set this value 10. 11. In reality, due to gas leaks during the compression process, it turns out slightly less (8. 9).

For such high values ​​of the compression ratio, gasolines with a high octane number, which is more than 90, are needed. In the recommendations of the ICE manufacturers, you can find recommendations for the use of A92 or A95 gasoline. Therefore, you should adhere to the requirements. If fuel with a low octane rating is used, detonation will occur, which will lead to the rapid destruction of the engine.

Traditionally mineral oils are recommended for small motors. They are obtained as a result of the cracking process carried out in the refining of oil. Achieve obtaining a viscous liquid with a high viscosity index, more than 20 centistokes. To give additional positive characteristics, additives are produced. additives. They are necessary for:

  • Prevention of foam formation. In this case, the oil film will evenly cover the parts upon contact during operation;
  • Washers of parts. Detergent additives help to constantly change the oil in the contact zone. Then there will be no burn-in;
  • Non-stick additives help remove waste oil at high temperatures of metal parts.

In recent years, foreign manufacturers (Germany and France) have proposed using semi-synthetic oils for two-stroke internal combustion engines. They are obtained as a result of complex processing of natural gas. These lubricating fluids have a constant viscosity over a wide temperature range, which has a positive effect during operation. The viscosity remains even when the metal is heated to 100. 150 ⁰С. In mineral oils, the indicator decreased tenfold.

Semi-synthetic oils are more stable when heated. When using them, motors show a higher service life. On average, there is an increase in the resource by 30. 40%.

In studies carried out in the Netherlands (2001. 2004), it was found that the use of a semi-synthetic lubricant allows some reduction in the concentration of oil during the preparation of the vehicle. But these data are advisory in nature. ICE manufacturers have not yet commented on this issue.

Operation of a two-stroke gasoline internal combustion engine

Work in two-stroke internal combustion engines occurs in the following sequence:

First measure. When it is committed, the piston moves from the bottom dead center (BDC) to the top dead position (VMP).

  • Vacuum is generated in the area of ​​the crank mechanism.
  • From the carburetor, the gasoline-air enters the space when the intake window is opened (it is usually overlapped by the piston).
  • A part remains inside and creates a lubricating film on the surface of rubbing parts.
  • After the moment the purge hole closes, compression of the combustible mixture begins.
  • Do not reach the VMP, there is a supply of electricity to the spark plug. The compressed mixture ignites.

Second measure. Here, the working stroke, the release of the exhaust combustion products and the blowing of the cylinders take place.

  • When the petrol-air mixture ignites, it burns. Combustion is accompanied by an increase in pressure. It increases to 25. 30 bar.
  • The piston is under increased pressure and moves down towards BDC. A working move is in progress.
  • The force of the gas pressure is transmitted by the crank mechanism. The engine crankshaft rotates. The torque is transmitted to the working elements of the tool or gearbox.
  • Moving on, the piston opens the purge window. Combustion products leave the cylinder and are directed to the exhaust system (muffler).
  • Purge is carried out until the purge and inlet ports are completely closed.

For one revolution of the crankshaft in engines of this type, a full cycle of operation is performed. Specific power in such processes is 50. 75% higher than can be obtained in a four-stroke process.

In practice, there are not only single-cylinder engines for motor vehicles create two-cylinder internal combustion engines. For cars, motors are created in which a larger number of cylinders are used.

The efficiency of such internal combustion engines is lower than in power plants operating in a four-stroke design. The explanation is simple, the purging and filling of the cylinders with a fuel mixture in more complex structures is much higher.

Important should be noted. Lubrication is carried out by passing the mixture through the crank chamber. If there is little oil in the composition, then friction contact without an oil film is possible. This will cause scuffing and engine damage.

If the oil turns out to be more than the required rate, then it will burn during combustion. The combustion process will be extended over time. Afterburning will occur on the exhaust, which will lead to overheating of the internal combustion engine. The exhaust will be noisy and smoky.

Table: Amount of gasoline and engine oil for the preparation of the fuel mixture

proportion Ready mix amount
Ready mix, l Gasoline, l Oil, ml
1:15 1.0 0.933 66.7
1:15 2.0 1,867 133.3
1:15 3.0 2,800 200.0
1:15 4.0 3.733 266.7
1:15 5.0 4.667 333.3
1:15 6.0 5,600 400.0
1:15 7.0 6.533 466.7
1:15 8.0 7.467 533.3
1:15 9.0 8,400 600.0
1:15 10.0 9,333 666.7
1:15 11.0 10.267 733.3
1:15 12.0 11,200 800.0
1:15 13.0 12,133 866.7
1:15 14.0 13,067 933.3
1:15 15.0 14,000 1000.0
1:15 16.0 14.933 1066.7
1:15 17.0 15,867 1133.3
1:15 18.0 16,800 1200.0
1:15 19.0 17,733 1266.7
1:15 20.0 18,667 1333.3
1:20 1.0 0.950 50.0
1:20 2.0 1,900 100.0
1:20 3.0 2,850 150.0
1:20 4.0 3,800 200.0
1:20 5.0 4,750 250.0
1:20 6.0 5,700 300.0
1:20 7.0 6,650 350.0
1:20 8.0 7,600 400.0
1:20 9.0 8,550 450.0
1:20 10.0 9,500 500.0
1:20 11.0 10,450 550.0
1:20 12.0 11,400 600.0
1:20 13.0 12,350 650.0
1:20 14.0 13,300 700.0
1:20 15.0 14,250 750.0
1:20 16.0 15,200 800.0
1:20 17.0 16,150 850.0
1:20 18.0 17,100 900.0
1:20 19.0 18,050 950.0
1:20 20.0 19,000 1000.0
1:25 0.5 0.480 20.0
1:25 0.6 0.576 24.0
1:25 0.8 0.768 32.0
1:25 1.0 0.960 40.0
1:25 1.5 1,440 60.0
1:25 2.0 1.920 80.0
1:25 2.5 2,400 100.0
1:25 3.0 2,880 120.0
1:25 3.5 3,360 140.0
1:40 0.5 0.488 12.5
1:40 0.6 0.585 15.0
1:40 0.8 0.780 20.0
1:40 1.0 0.975 25.0
1:40 1.5 1,463 37.5
1:40 2.0 1,950 50.0
1:40 2.5 2,438 62.5
1:40 3.0 2.925 75.0
1:40 3.5 3.413 87.5
1:50 0.5 0.490 10.0
1:50 0.6 0.588 12.0
1:50 0.8 0.784 16.0
1:50 1.0 0.980 20.0
1:50 1.5 1,470 30.0
1:50 2.0 1,960 40.0
1:50 2.5 2,450 50.0
1:50 3.0 2.940 60.0
1:50 3.5 3.430 70.0
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The amount of gasoline and oil in mixtures

For ease of use for users of two-stroke internal combustion engines, all recommendations for creating proportions are summarized in the table.

How to prepare the fuel mixture

To prepare the mixture, prepare a transparent container in which marks are required:

  • The amount of gasoline, l
  • Amount of engine oil, ml This label is placed above.
  • Gasoline is poured to the required level. Using a medical bulb can remove excess.
  • Add oil to the upper mark.
  • The lid is closed and the mixture is stirred.
  • The finished mixture is poured into the fuel tank.
  • Surplus is poured into an additional bank

Standard proportions

First of all, it is necessary to take into account the information that the manufacturer recommends, since in the event of a failure of the lawn mowers, you can present your claims to him, and not to a third-party source. If there is no instruction in the passport, and even more so if there is no passport, we recommend that you look for another trimmer model in a more reliable seller.

For all other cases, when you have a lawn mower model in your hands and there is no way to find out its technical features, there are standard proportions of the Most probable fuel mixture components for a two-stroke engine. Basically, for THESE units, AI-92 gasoline and a special synthetic oil are used, which contains a solvent for better mixing with fuel. This oil evaporates slowly and has the ability to completely burn out in the cylinder, Do not leave carbon deposits.

The standard ratio of synthetic oil to gasoline is 1: 50. This means that 5 liters of gasoline need 100 ml of oil, and in accordance with this, oil consumption per 1 liter of gasoline is 20 ml. Knowing the amount of oil required to dilute 1 liter of fuel, you can easily calculate any rates when preparing fuel for the trimmer. When using mineral oils, a ratio of 1: 40 is most often the standard. Therefore, 1 liter of fuel will require 25 ml of such oil, and for a 5-liter canister. 125 ml.

When working with lawn mowers, a person with little experience in operating such equipment will not be difficult to determine and correct the actual amount of oil required for a particular model. You should only pay attention to Exhaust gases (their color, odor toxicity), cycle stability, engine heating and developed power. details about the consequences of incorrect mixing proportions of gasoline and oil can be expected in another section of the article. There are variants of lawn mowers running on AI-95 gasoline. This should also be considered.

Mixing rules

And now about how to mix the components correctly. However, it would be more logical to start with an analysis of common, but absolutely unacceptable mistakes, which many owners of this mowing unit “sin” with. The following actions are considered as mixing errors.

  • Adding oil to the fuel already in the mowers’ gas tank. Similarly, a homogeneous fuel mixture will NOT work. Perhaps it will work, if only then shake the trimmer for a long time. But it is unlikely that someone will do this by taking the weight of the unit.
  • First pour oil into a mixing container, and then add gasoline to it. Gasoline has a lower density than oil, so if it is poured into the oil, it will remain in the upper layer, that is, natural mixing will NOT occur. Of course, it will be possible to mix later, but much more energy will be required than if it were done the other way around. pour oil into the filled gasoline.
  • Ignoring accurate measuring instruments for taking the required quantities of ingredients used. In other words, diluting the amount of oil or gasoline “by eye” is a bad habit when operating motor vehicles.
  • Take empty drinking water bottles for preparation of the fuel mixture. Such a container is made of too thin polyethylene, which can be dissolved in gasoline.

Considering all of the above, we recommend using the following rules when mixing a fuel mixture for two-stroke trimmer engines.

  • Use only clean containers made of metal or special plastic for storage of gasoline, oil, ready-made fuel mixture and its preparation.
  • Use for filling gasoline into the LEIKOME dilution container in order to avoid spilling, and for adding oil. in a measuring container with volume risks or a medical syringe for 5 and 10 ml.
  • First, pour gasoline into the canister for preparing the fuel mixture, and then oil.
  • To dilute the mixture, first pour only half of the planned volume of gasoline into the container.
  • Next, add the entire amount of oil required to prepare the mixture to the gasoline.
  • Mix the contents of the dilution container thoroughly. It is best to stir by making circular movements with a tightly closed container. You should not stir the fuel inside the canister with any foreign object, since it is not known what material this object is made of, what reaction it can enter into with an ingredient in the mixture, how clean it is.
  • Add the rest of gasoline to the mixed mixture and mix thoroughly again.
  • You can refill the fuel tank of the lawn mowers.

It must be borne in mind that the ready-made fuel mixture does not have to be stored for more than 14 days, since it loses its properties, stratifies and evaporates, which leads to changes in proportions, and therefore, deterioration of trimmer performance.

Gasoline to lawn mower oil ratio

lawn mows are a fairly common technique for combating weeds in summer cottages, in road gardens and housing and communal services. These devices have two more names. trimmer and lawn mower. These units differ in their engines. The more expensive ones have four-stroke engines, all the others have two-stroke engines. Of course, the latter are the most popular among the population, since they are simpler in design, and lighter in weight, and much cheaper than their four-stroke competitors. However, two-stroke models are inconvenient in that the fuel mixture for them must be prepared manually, maintaining a strict dosage between gasoline and oil. In four-stroke analogs, the mixing of THESE components occurs automatically, you only need to fill the gas tank and oil tank with the corresponding substances. Let’s consider the issue of the correct refueling of two-stroke lawn mowers, since it depends on how effective and long the operation of such a unit will be.

Consequences of violation of the ratio

How accurately you will observe the proportions of the oil-gasoline mixture recommended by the manufacturer depends on the service life of the motor scooter engine. The fact is that the fuel mixture enters the cylinders in the form of gasoline-oil mist. And the task of the oil composition is to lubricate the moving and rubbing parts and surfaces of various parts in the cylinder. If it suddenly turns out that there is not enough oil, but somewhere it will not be enough at all, the parts touching dry will begin to damage each other. As a result, scuffs, scratches and chips are formed, which will certainly lead to complete or partial engine failure (for example, it can jam).

In the opposite case, when too much oil enters the engine, it does NOT have time to completely burn out, settling on the cylinder walls and turning over time into solid particles. coke, slag and the like. As you might guess, this also leads to engine failure. The most important thing is that you must not allow. even a single violation of the proportion towards the lack of oil. It is better to pour a little oil 10 times than not to top up just once. It often happens that this time is quite enough to break the engine.

How to choose for lawn mowers?

For two-stroke engines, lawn mowers use AI-92 or AI-95 gasoline. Most often. the first of the named. There is always information about this in the technical data sheet of the product. If, for some reason, it is not known exactly on which gasoline the trimmer should work, you can choose it by testing both brands of gasoline in action. Global changes in the engine will not happen from this, and it is quite possible to determine what kind of gasoline and or another model of the unit “likes” more, according to some factors. This will be shown by the developed power, and throttle response, and engine heating, as well as its stable operation at all speeds.

But it is much more difficult to determine the proportions of oil to a certain volume of gasoline. In this case, you need to know at least something in the equipment manufacturer. And already according to the standard proportions for this manufacturer, select the proportion for a specific model, taking into account the type of oil.

For example, for Chinese low-power trimmers, two ratios are mainly used. 1: 25 or 1: 32. The first is for mineral oils, and the second is for synthetic oils. In the choice of standard proportions for lawn mowers of European and American manufacturers in connection with the type of oil, we have already told you earlier. According to the class of oils for household trimmers, you need to use TB oil according to the API classification. For more powerful. class TS.

For the ratio of gasoline to oil required for lawn mowers, see the following.