How to dilute gasoline for a chainsaw

For normal operation, any internal combustion engine needs at least two things:

  • Fuel, or rather, the fuel-air mixture prepared by the carburetor enters the combustion chamber, ignites, expands, and “pushes” the piston down, due to which useful work is done.
  • Lubricant. necessary to reduce the friction force between the contacting engine parts.

First of all, oil is needed in order to eliminate the so-called “dry” metal-to-metal friction. It causes critical wear on the contacting parts: scoring, scratches, compression decrease, lowering of the service life. Oil is also needed to seal the gaps.

Why is it necessary to mix oil with chainsaw fuel??

This requirement is directly related to the peculiarities of the device and the principle of the two-stroke engines, which are equipped with this tool.

Lubrication of the crank and piston train and cylinder group parts is provided exclusively by the oil in the fuel. Due to the special engine construction, the air-fuel mixture enters not only into the combustion chamber, but also into the crankcase where the crankshaft and piston rod are located. Thus, all rubbing parts are lubricated.

How to fill a chain saw

How to correctly fuel a chainsaw so that it works for a long time and does not cause repair problems. This question often interests those who have recently bought a chainsaw and had no previous experience in preparing a fuel mixture. Usually in the instructions to a particular chainsaw there are instructions from the manufacturer. Based on the recommendations of various manufacturers, we have compiled a little instruction.

In order to dilute the oil with gasoline for a chain saw you need to use only high quality ingredients. Gasoline must be 92 or 95 octane and without ethyl or other additives. Gasoline should be fresh and not impaired.

99% of chainsaws are built with two-stroke engines, so it is better to use oil for two-stroke engines. Synthetic oil from reputable manufacturers is considered the best. Some gasoline tool manufacturers produce their own oil for their equipment. For example Sturm, Spektr and others. On the oil, in terms of quality, never save. The more so because its consumption is not great. Now about the consumption.

How to dilute petrol and chain saw oil in the right proportions. General proportions for all gasoline-driven chainsaws are 20 ml to 50 ml oil to 1 liter of gasoline (depending on the manufacturer) Most home chain saws have 25 ml oil to 1 liter of gasoline. Nevertheless, for the exact proportions of the fuel mixture, see the recommendations for your particular saw. What happens if you don’t get enough oil?? Engine lubrication will deteriorate and accelerate engine failure. If there is more oil, the chainsaw will smoke and will form soot on the piston and spark plug.

How do you measure the oil?? When you buy a chain saw, it usually comes with a plastic measuring jug with divisions. It is usually not very accurate and the measuring stick is not to be trusted. Many people use a medical syringe to accurately dispense oil and this is not a bad option. First pour gasoline into a canister or glass jar, and then add oil to it for better mixing. Mix well and thoroughly. Prepare the mixture on the basis of its production within 10 days. After 10 days the fuel mixture that is not consumed loses its quality and will ruin your tool when you use it. After working with the chainsaw, be sure to drain the remaining gasoline from the tank into a mixing tank until the next time. Remember to keep the fuel mix tightly sealed and away from sources of fire and heat.

After you have finished working and drained the gasoline from the tank and you are not going to use the tool in the near future, you need to start the chainsaw again and let it run until it stalls. That’s so the carburetor stays dry during storage.

Remember that most chain saw engine failures occur as a result of using inadequate or improperly prepared fuel-oil mixture. The repair or replacement of a chainsaw engine sometimes costs almost a new tool, and warranty repair for a breakdown as a consequence does not extend. Service centers can accurately determine the cause of engine damage. So be serious about mixing and matching the right mixture to your machine.

The consequences of wrong dosage

Many chainsaw users do not pay proper attention to the proportion. 50 grams more or less is the same? And in vain: the cause of saw malfunctions is often the operation with an improperly prepared fuel mixture. It is possible to make a mistake or upset the oil ratio either upward or downward.

If there is a lot of oil.

ratio, gasoline, chainsaw

There is an opinion among chainsaw users that “you can’t ruin an engine with oil”. But there is a reason they come up with the necessary parameters of the ready mixture. Too much oil can also be harmful and inconvenient. Despite improved residue-free combustion, some of the hydrocarbons still turn into soot and carbon residue. They are not much at a low concentration, but if you mix twice as much oil as normal, you get cinder. It is especially dangerous for cheap mineral oils that don’t have a “flushing” effect.

You are also very likely to find oil in the air filter if the carburetor overflows. The spark plug will also be in soot. it needs to be cleaned, flushed and dried. Also the vapors of unburned oil will settle in the muffler and will burn off during intensive work and create a plume of soot and sparks.

After such refueling almost all insides of the saw have to be thoroughly cleaned and rinsed. The most amusing “surprise” will be the “death” of piston rings. but this is only in the case of systematic abuse of oil overflow and operation under high load.

or not enough

“Greed with the fuel mixture has killed more than one piston. That’s where it’s really better to be “overdoing it” than underdoing it. If in the first case you will have to have a thorough “washing” of the machine, in the second case you will have to change the cylinder head, and it is not profitable at all on many saws and costs quite a lot of money on other saws.

Conclusion: economy is meaningless. If there is not enough oil, the piston begins to chafe heavily on the cylinder, as gasoline is too fluid at high temperatures to perform its lubrication function.

Tragic results: Scored piston, ruined saw engine. If the owner will come to his senses in time, he will find that the piston and the cylinder turn a beautiful blue. No one master can guarantee how long these will last.

How to mix your own fuel for STIHL chainsaws & equipment

What’s the right oil to gasoline ratio for your chain saw?

The gardening season is about to begin. Get your equipment ready for the season.

A properly mixed mixture, will ensure the smooth operation of the engine, the complete combustion of fuel without the formation of carbon deposits, smoke or scuffing.

The mixture should be made with 92 gasoline and two-stroke oil (synthetic).

Fuels below 92 octane are not suitable. We don’t recommend the 95th oil in our products.к. It has a lot of different additives, which can negatively affect the operation of gasoline equipment.

Knead the mixture before each use. Don’t mix too much.

The oil-fuel mixture must not be stored for more than 2 weeks, then irreversible oxidation processes occur, and the mixture composition changes.

i.e. per 1 liter of gasoline. 20 milliliters of oil.

(or this proportion. 100 ml of oil per 5 liters of petrol).

A full tank at full load lasts from 30 to 45 minutes, if you do not plan to use the equipment that long, do not fill a full tank.

Do not use old gasoline, it wears out over time and changes the octane number.

Never fill 2-stroke machines with gasoline and run the risk of serious and costly repairs.

Only use a gasoline/oil mixture.

Why the wrong proportion can put the equipment out of order?

The thing is that unlike 4-stroke engines, 2-stroke engines do not have an external lubrication system of the internal parts of the engine, a properly prepared fuel mixture is very important for them. If you add little oil, the lubricating properties of the mixture will decrease, leading to early wear of the equipment. Conversely, if too much oil is added. this would spoil the combustion properties of the mixture and greatly reduce the output of the machine.

A two-stroke engine does not have a separate oil sump and all friction parts inside the engine are lubricated by oil. which is in the fuel mixture.

The oil has to lubricate all the friction surfaces inside the engine and has to burn without formation of deposits. This is the fundamental difference between oils for 2-stroke and 4-stroke engines.

In addition to the above functions oil should:

  • keep the gaps, especially between the parts of the cylinder block, small and free of bursting gases from the combustion chamber.
  • waste heat resulting from combustion and friction.
  • prevent corrosion of engine parts.

The engine oil and fuel mixture should be mixed in a gasoline-resistant container, not in the tank itself! Pour petrol into a clean, dry canister and then add oil.

In the reverse order it is not necessary to t.к. the oil poured in first will stick to the bottom and is hard to mix later, you will have to put more effort. After adding both ingredients, close the container tightly, and shake thoroughly, vigorously mixing the components.

How to mix (thin) gasoline and oil for 2T engines.

To summarize the above. Use for your brand equipment the oil developed or recommended by the manufacturer of that equipment. Example: STIHL HP oil for STIHL FS 55 brushcutter (see STIHL manual oil change kit). Figure 1a) or STIHL HP SUPER, for the Husqvarna 128R brushcutter use Husqvarna HP oil (Figure 1b) or Husqvarna LS oil. For 2.Never use 4-stroke engine oils for water-cooled engines. e.g. 10W30, SAE 30, etc.д.

Figure 1 a-Husqvarna oil (left), STIHL oil (right)

Useful tip

Never use 2-stroke oil intended for water-cooled engines, as these oils are designed to operate at lower temperatures.

It is necessary to follow the proportions of oil and gasoline for the fuel mixture specified by the manufacturers in the instruction manual. The ratio most commonly quoted by Chinese manufacturers is 1 part oil to 25 parts gasoline, but for STIHL and Husqvarna the ratio is 1:50.When mixing small amounts of oil (up to 1 liter), it is important to carefully measure the oil in the mixture. Even small miscalculations in the amount of oil can lead to serious inconsistencies in the mixture. In these cases, a medicine syringe may be used for accurate dispensing.Mixture must be prepared in a clean container designed for the purpose. (see also. Figure 2)

Useful hint

I do not recommend the use of improvised plastic bottles and canisters, because gasoline can dissolve plastics and all this “slurry” gets into the fuel tank and fails the carburetor.

Plastic canisters designed for petrol are always marked with the “flame” sign. It is very handy to use a canister with a no-fill system (see the “no-fill system” on page 31). figure 3). The no-fill system has a valve that prevents fuel from spilling when the tank is full.

Figure 3: No-fill system

The first start and running-in of a chainsaw

A new tool beckons. you want to try it in work right away. But don’t rush. there’s a stranger in front of you. You have to give both the tool and yourself a chance to get used to each other.

This “warming up” process is achieved with a proper running-in. The running-in period is a very important moment. Not only new cars need it, but also such powerful and sometimes unpredictable tools like modern chainsaws.

The running-in of a chainsaw is essentially the same work, but in a gentle mode. It is desirable to do it both with new, just bought equipment, and with a chainsaw that has been repaired. You get the benefits as a result:

All moving mechanisms, components and parts, both engine and cutting equipment, are tested and lapped; their service life is extended; you will make sure your tool is reliable; inexperienced users acquire the skills.

The first start of the chainsaw is sometimes recommended to carry out without the bar and chain, just to check and run-in the engine. But that’s not right. The motor does not get the load it is designed for and behaves very differently. It kicks up at high rpm, and this is fraught with rapid wear and tear. That’s why you should start with the whole thing at once. with the cutting attachment in place.

Before you attach the bar and put the chain on, remember that lubrication of the cutter bar is absolutely essential for good cutting performance.It is not possible to grease the assembled saw thoroughly and extensively. Soak the blade in oil just before mounting to get the grease into all the nooks and crannies. Pour the manufacturer’s recommended oil into a container and dip the saw bar in it. Let it sit like that for a few hours.

The next step is to tension the chain. It should be stretched a little looser, so that you can turn it by hand. Then start the engine at idle speed and let the chain move a bit. The so-called “run” of the chain and tire. Time: up to 5 minutes. Then turn off the motor, wait for the chain to cool, and check tension again. If it is loose, you need to tighten it with a wrench, or if it is keyless, with a locking screw. Tension is checked by test cutting, for example, thin twigs (so that there is no load on the tire, only on the chain).

Most chain saws have a two-stroke engine. It is not run on pure gasoline, but on a fuel mixture, which must be prepared in advance. Dilute gasoline for a chainsaw must be in a certain proportion, the ratios are always specified in the passport and recommended by the manufacturer. Gasoline and oil are needed to make a proper fuel mixture.

Gasoline. You have to take a brand that has an octane rating of at least 90. Ideal. А-92. If you buy it for your chainsaw, make sure the fuel is good, from a trusted source. Also note that there are older models of chainsaws that do not have a catalytic converter. Only leaded gasoline is suitable for them. If there is a catalytic converter (as evidenced by the green fuel cap), you can safely use unleaded.

Oil. Always use a good two-stroke engine oil before you run the chainsaw in and during work. The tool manufacturer always indicates the recommended brand of oil. Often the big brands in the manufacture of equipment have a contract with the companies that produce fuels and lubricants, and they produce oil specifically for their tools.

This brand lubricant is a win-win, it takes into account all the nuances of work and will fit perfectly.

Often such brand oils are designed for products of several brands, for example, German STIHL, Swedish Husqvarna and American Partner and Oregon, use the same oil. In general, try to find what the manufacturer recommends, and if not, then any two-stroke oil. But by no means four-stroke (it has a completely different viscosity and fouling). Two-stroke oil for boat engines is also not suitable (marked TCW).

Gasoline and oil proportions for chain saws. They are slightly different in different models, depending on the brand and power tool, and are also necessarily specified by the manufacturer.

For example, for the same STIHL and Husqvarna petrol to oil ratio is:

For engines up to 1.5 kW. 1:40, 1 part oil. 40 parts gasoline. That is 1 liter of petrol divided by 50, you get 0.025 liter of oil (25 grams);2. If the engine power is more than 1,5 kW. 1:50, to 1 part of oil 50 parts of petrol. That is, you need a little less oil for a powerful motor. Liter of petrol divided by 50, you have 0.020 liter of oil. only 20 grams.

These proportions are optimal for most types of saws. The exceptions are old chainsaws like the Ural or the notorious Druzhba. They need much more oil. The ratio is 1:15, so you have 0.065 liters of oil per liter of gasoline. 65 grams. After the running-in period, you may reduce the amount of oil to 50 ml per liter.

If you own a chain saw, which is not brand new and from a progressive maker, you shouldn’t take the risk and take the minimum ratio. 20 grams of oil per liter of gasoline. it is better to take average for modern saws: 1:33 (30 grams of oil for one liter of gasoline).This ratio is ideal for adding oil before using your chain saw for the first time. From here on you can add 25 and 20 (for heavy-duty, new chain saws), but when you add oil for the first time, add a little more. So, the first mix is prepared with 3-4 grams more oil than recommended.

The container must be clean and designed specifically for fuel and lubricants;2. Pour half of the petrol. 0,5 l; 3. We add oil (average 30 grams);4. Stir thoroughly;5. Then we add another half liter of gasoline;6. Stir gently once more. The fuel-oil-petrol mixture is ready.

Preparation of the fuel mixture: 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 well-blended fuel mixture.

Chain saw fuel mix is made of two components. oil and gasoline. Two-stroke chainsaws are fitted with a two-stroke engine, so that oil is not added to the lubrication system (like in a four-stroke engine) but directly to the gasoline. It is very important to observe the correct proportions of ingredients and, of course, in no case try to work on pure gasoline, because that way you will very quickly “kill” the chainsaw.

The oil must always be intended for two-stroke engines of gardening and forestry equipment (i.e., never use oil for boat motors or scooters). As practice shows, such oil can be bought in any store or service center, where chainsaws are sold or serviced.

If we talk about what gasoline pour into the chain saw, it would be optimal to use fuel with the octane number of A-95, in this case, the savings on fuel can turn out badly. European manufacturers often indicate that you can use gasoline A-90 or A-92, but in post-Soviet countries the quality of gasoline is inferior to European, so in our realities it is better to use higher-quality gasoline.

As for the very proportion of gasoline-oil mixture, then everything is simple: you must clearly follow the instructions of the tool. All chainsaw manufacturers indicate the required ratio in the instruction manual or in the tool’s passport, in addition, the proportions for filling the chainsaw may vary depending on the model of chain saw. As a rule, the ratio of oil to gasoline in a brand-name chainsaw is 1:40 or 1:50, which means one part oil to, say, 40 parts gasoline.

Now for the arithmetic, 1 liter of gasoline = 1000 ml of gasoline, divide by 40 and you get 25 ml of oil. If you perform the same actions for 1:50 ratio, you get 20 ml of oil for 1 liter of gasoline.

As for the budget chainsaws made in China, the situation is a little different. Gasoline to oil ratio for a chainsaw made in China 1:25, that is 1000 ml of gasoline divided by 25, we get 40 ml of oil. The thing is that in branded chainsaws has a solid build and the distance between the pistons and cylinders in the engine is much smaller than in Chinese chainsaws, so the required amount of oil is almost twice as different.

To measure a correct portion of oil, use an ordinary medical syringe of sufficient volume.

One more tricky part. in a dry gasoline canister, first pour the gasoline, then the oil. The procedure on the contrary is fraught with a fuel mixture of poor quality, because the oil is more dense, will stick to the bottom of the canister. That is why there is no way to talk about a good mixture.

Always prepare fuel mix in canister and fill fuel tank with pre-mixed special fuel! Never prepare and mix it directly in the gasoline tank of your chainsaw!

If the question of how to dilute gasoline for gasoline saws figured out, then and about the storage conditions and expiration date of the fuel mixture it is worth saying a few words. It is best and easiest to prepare a gasoline-oil mixture for 1 liter of gasoline, it is recommended to do it just before working with the tool. Chainsaw fuel tanks have a volume of 0.3 to 1 liter. In domestic use, the entire volume of the prepared combustible 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 calculate that storage time of the ready mixture will be 7-10 days

The fact that the oil presented 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, it can cause breakdown and failure of the chainsaw.

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

Peculiarities of the running-in of a new tool

This includes sparing the chainsaw during the initial phase of its operation. The technology also provides running the engine on a mixture with 20% more engine oil.

For the operating time in hours, refer to the instruction manual provided. In practice, for the tool to reach the working level, it is enough to work 3-5 filling of the gas tank of the saw.

New models do not need a running-in period, but it is not recommended to use the chainsaw with heavy loads for the first few hours of operation.

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