How To Prepare A Mixture For A Lawn Mower

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

How To Prepare A Mixture For A Lawn Mower

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

If we talk about which gasoline to pour into a chainsaw, it will optimally use fuel with an octane rating A-95, in this case, fuel economy can turn out disastrously. Often, European manufacturers indicate that A-90 or A-92 gasoline can be used, but in post-Soviet countries the quality of gasoline is inferior to European, so in our realities it is better to use better gasoline.

As for the most proportions of a benzo-oiled mixture, then everything is simple: you must follow the instructions for the tool. All manufacturers of chainsaws indicate the necessary ratio in the instruction manual or in the instrument passport, in addition, the proportions for refueling the chainsaw may differ depending on the model of the chainsaw. 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 get 25 ml of oil. If you perform the same steps to the ratio 1:50, then we get 20 ml of oil per 1 liter of gasoline. As for budget-made Chinese chainsaws, the situation is slightly different. The ratio of gasoline and oil for chainsaw made in China 1:25, that is, 1000 ml of gasoline is divided by 25, we get 40 ml of oil. The thing is that in branded chainsaws a good assembly and the distance between the pistons and cylinders in the engine is much smaller than that of Chinese chainsaws, therefore the required amount of oil differs almost twice.

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

Another subtlety. In a dry canister for gasoline, first fill in gasoline, and then oil. On the contrary, the procedure is fraught with a poor quality fuel mixture, because the oil is more dense, sticks to the bottom of the canister. What a good mix.

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Be sure to prepare the fuel mixture in a can and pour ready-made special fuel into the gas tank! Never cook or mix directly in the fuel tank of a chainsaw!

If the question of how to breed gasoline for a chainsaw figured out, then on storage conditions and shelf life of the fuel mixture It is worth saying a few words. It’s best and easier to prepare a 1-liter gasoline-oil mixture, it is recommended to do this immediately before working with the tool. The fuel tanks of chainsaws have a volume of 0.3 to 1 liter. In domestic use, in one session, the entire volume of the prepared combustible mixture is rarely used, 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 calculate that shelf life of the finished mixture will be 7-10 days. The fact is that the oil currently on the market 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 stalls (so that the saw has a dry carburetor) and now you can leave it until the next operation session.

Unsuitable fuel mixture must be disposed of.

  1. The amount of oil per liter of fuel
  2. Rules for the preparation of the fuel solution
  3. Fuel mixture preparation
  4. Characteristics of erroneous use
  5. Conclusion

The emergence of lawnmowers on sale has greatly facilitated work on the care of grass on lawns. Depending on the engine model, they are divided into 2 types: gasoline and electric. If you choose between these options, then gasoline is preferable, since it is much more mobile. It does not require wires and an electrical outlet.

In order for the lawn mower to help care for the lawn for as long as possible, you need to carefully monitor its condition and regularly carry out maintenance.

The amount of oil per liter of fuel

Two types of engines are installed on gas mowers. Four-stroke and two-stroke. There are significant differences between them. The first option has a separate supply of oil and gasoline, that is, there is no need to prepare a special fuel mixture. And the second type of motors requires constant lubrication of engine parts by mixing fuel and oil in a certain proportion.

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If you purchased a grass mowing tool with a two-stroke cycle of the engine, then you have to do the preparation of the fuel composition to refuel the mower.

The fuel mixture consists of gasoline and special oil for engines with a two-stroke cycle. When choosing oil, it is advisable to use lubricant from the same manufacturer as the lawn mower, but this is not a fundamental issue.

Two-stroke engines can be distinguished from others by marking on the label. It also indicates the ratio in which it is necessary to dilute the lubricant with the fuel. When using good and high-quality oils, the dosage, as a rule, is: 1 part of oil to 50 parts of fuel, that is 2% of the total volume of fuel. Some owners get confused in these proportions. In fact, everything is very simple.

If the label indicates 50: 1, this means that 5 grams of gasoline needs to be poured 100 grams of oil. In other words, 20 grams of oil is required per liter of gasoline to lubricate the engines.

Rules for the preparation of the fuel solution

Before starting work, you should carefully study the instructions. In no case do you need to do everything “by eye”. Each manufacturer adds its components to the fuel, so it will be useful to familiarize yourself with its recommendations.

The basic rules for preparing fuel for a two-stroke lawn mowing lawn are as follows.

  1. Strictly observe the proportions when preparing the fuel solution. If the concentration of the lubricating component is insufficient, the piston and cylinder will become very hot, and the engine may fail under such conditions. Due to overheating, barbs appear on the cylinder walls, which subsequently will require serious investment in repairs.
  2. Do not add excess oil to the mixture. A large amount of it will lead to the appearance of additional soot and a speedy reduction in engine life. Elimination of defects is also expensive, as is the case with oil savings.
  3. Long-term. Than one month. Storage of the fuel mixture is not recommended, since it begins to decompose and lose its basic properties. The prepared mixture can be stored for no more than 90 days, clean fuel is even less. About 30.
  4. Carefully monitor the cleanliness of the combustible solution, protect it from various debris and other pollutants, which could damage the engine.
  5. After completion of work, if a long break is ahead, it is better to drain the fuel mixture from the tank.
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Before preparing the fuel mixture, you should take care of its safety in the future. It is better to store gasoline in a metal container, the fuel content in plastic canisters specially designed for this is allowed. In no case should you store gasoline in plastic bottles: the fuel enters into a chemical reaction with polyethylene and decomposition products if it enters the carburetor can disrupt its operation.

Fuel mixture preparation

Many manufacturers of mowers are already supplied with special containers for gasoline and oil with measured marks. But in order to more accurately mix lubricant and fuel, it would be better to use a syringe.

For operations to prepare a mixture of gasoline with oil, simple equipment will be required:

  • Watering can;
  • A medical syringe or measuring cup;
  • Capacity of one liter;
  • Oil suitable for two-stroke engines;
  • Petrol.

First, with the help of a watering can, gasoline is poured into a liter container. For the fuel solution, it will be correct to use the brand of gasoline that is indicated in the instruction manual, since fuel with a lower octane rating can ruin the engine.

Next, we collect the oil, observing the proportion, and pour it into the fuel. Gently mix the mixture. The fuel solution is ready.

After adding oil to the fuel, the mixture acquires a special color, which in the future gives you the opportunity to distinguish the finished fuel solution from pure gasoline.

Do not prepare a large fuel mixture. Manufacturers of lawn mowers do not recommend this.

Characteristics of erroneous use

The use of contaminated or improperly diluted solution often leads to serious malfunctions. To prevent this from happening, you need to carefully monitor some engine indicators:

  • Rapid contamination of the fuel filter;
  • The appearance of dirt and various deposits in the carburetor, which will interfere with normal operation.


Applying the above recommendations, you can independently prepare a high-quality fuel mixture for a two-stroke engine. It will ensure the continuous operation of the gas mower for a long period, and also help protect the engine from significant malfunctions.

You can find out how to change the oil in a four-stroke engine lawn mower from the below.