Petrol to oil ratio for Foresta brushcutters

petrol, ratio, brushcutters

How to prepare the right fuel mixture for grass trimmer?

Let’s tell you how to dilute gasoline and oil for grass trimmer. Beforehand, you should deal with organizational issues:

petrol, ratio, brushcutters
  • Selecting containers to store fuel mixture components. Buy metal gasoline canisters. For lubricating liquids the factory packing is enough.
  • Do not prepare a large volume of mixture that can be ignited in engines, because the structure of the mixture will be disturbed. The separation into fractions will begin: the heavy will sink to the bottom, and the light will form the top layer.
  • Prepare a medical syringe to accurately dispense the lubricant to add to the gasoline for dilution.

We draw the attention of grass trimmer owners to one detail. Lubricants should not be purchased in advance. Buy the volume that will be enough for the upcoming season.

How to Mix Petrol Oil for 2 Stroke Engine Whipper Snipper / Weed Whacker

How to choose the right gasoline for your lawnmower. Peculiarities and proportions of fuel.

Depending on the engine device, trimmers are divided into two-stroke and four-stroke. In the first case, the piston in the internal combustion engine makes 2 strokes per working cycle, and in the second case. 4 strokes. Differences in engine operating principle result in different approaches to filling the trimmer for grass.

Filling up brushcutters with two-stroke engine

In normal household models of brushcutter is used, as a rule, a two-stroke engine. The lawnmower does not need a lot of power and speed, so it is quite suitable for the task at hand. It is also a much cheaper and simpler engine, but it is fueled with a fuel mixture of oil and gasoline. This fuel is fed to the carburetor and then to the cylinder as an oil and gasoline mist. So the oil provides lubrication for all necessary parts, and during engine operation the oil is burned together with the gasoline. However, the combustion of this mixture is accompanied by a caustic smell and smoke, which increases the toxicity of the exhaust gases.

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Important! You should use special oil for two-stroke engines for these brushcutters, which is designed to burn completely without leaving any carbon residue and has low evaporation properties. The engine is more economical because it mixes well with petrol. and that’s because it contains 20% solvent.

Fueling your brushcutter with a four-stroke engine

Four-stroke engines are used in professional brushcutter models. They have plenty of power and can run for a long time without interruption or refuelling. They also use gasoline and oil as fuel, but they are filled in different tanks. This means that oil does not participate in the combustion process, so the exhaust fumes are not as toxic.

petrol, ratio, brushcutters

Side note! In addition to better environmental performance and the ability to heat up less, four-stroke brushcutter engines are also more economical. They use much less fuel. savings up to 50 percent for gasoline and up to 80 percent for oil.

Checking the gearbox before starting a gasoline grass trimmer should be done on a regular basis. Lack of lubricant or a small amount of lubricant increases friction in the gear train, which operates at quite high speeds. This results in overheating of the gears as well. Gearbox of brushcutter fails. To prevent the occurrence of such a breakdown in the process of operation and helps regular inspection.

If you find, before starting the gasoline grass trimmer, insufficient lubrication in the gearbox or its absence in the housing is laid “LITOL”. To do this, unscrew the screw on the bend of the gear housing and pour 1 to 2 ml of LITOL.

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When working with a gasoline trimmer for a long time, every 8-10 hours add grease to the gearbox.

How to mix

If you do not have a special measuring canister with divisions, which are included with each noteworthy grass trimmer for grass, or such a container is lost, then use any suitable container. Glass or metal is better. Plastic, too, can be applied, but it is necessary to choose a bottle with rigid walls.

The capacity of the container must be a multiple of 1 liter. You can also take a bottle of 1.5 liters, but practice shows that it is not very convenient. You also need a medical syringe, preferably 20 to 50 milliliters. First pour petrol into the container, then add a precisely measured amount of oil (by volume). You cannot change the procedure.

If you have “pre mix” oil, you need to close the bottle or canister with the cap and turn it upside down a few times and shake it vigorously. If the oil is “self mix”, it will dissolve on its own. The mixture must be used within one day. If you know how much fuel a grass trimmer consumes for a certain amount of work (or time), it is not difficult to calculate the amount of mixture. Otherwise, dilute the new fuel before each refill so that you have a minimum amount left before the end of the job.

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

To summarize the above. Use for your brand equipment the oil designed or recommended by the manufacturer of that equipment. For example, do not use STIHL HP oil for the STIHL FS 55 brushcutter (see STIHL Service Manual). Figure 1a) or STIHL HP SUPER, for the Husqvarna 128R brushcutter use Husqvarna HP oil (Figure 1b) or Husqvarna LS oil. For 2.Do not use 4-stroke engine oil. such as 10W30, SAE 30, etc.д.

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

Useful hint

Observe the proportions of oil and gasoline for the fuel mixture specified by the manufacturers in the instruction manual. Chinese manufacturers most often specify the ratio of 1 part oil to 25 parts gasoline; STIHL and Husqvarna specifies the ratio as 1/ 50.When preparing a small volume of mixture (up to 1 liter), it is very important to carefully measure the amount of oil included in the mixture. Even small miscalculations in the amount of oil can lead to serious inconsistencies in the mixture. In these cases, a medical syringe can be used to accurately dispense.The fuel mixture must be prepared in a clean container intended for this purpose. (cf. figure 2)

Top tip

Plastic gasoline canisters are always marked with the “flame” sign. It is very convenient to use a canister fitted with a spill-free dispensing system (see also “Service/Conditioning and dispensing” on page 31). figure 3). The no-fill system has a valve that prevents fuel from spilling when the tank is full.

Figure 3: Spill-free dispensing system

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