What Chains For Stihl 180 Will Fit
The engine of a modern chainsaw is a one- or two-cylinder carburetor engine. As a rule, two-stroke models are installed, although four-stroke ones are occasionally found. The frequency of rotation of the working shaft reaches 13.5 thousand revolutions, which puts forward stringent requirements for the quality and composition of the fuel mixture.
Manufacturers inform users in sufficient detail how to refuel a chainsaw, but for many this issue remains not entirely clear. Consider it carefully.
Features of the chainsaw device
A chainsaw is a chain hand tool, the cutting organ of which is driven by a carburetor engine.
As a rule, this is a single-cylinder two-stroke engine.
This design is simple, economical, able to work in any position.
The structure of the saw, in addition to the engine, includes:
- the tire;
- cutting body (chain);
- centrifugal clutch;
- ignition, fuel supply system, air filters;
- chain lubrication system;
The engine can be located vertically (powerful professional models of heavy weight) or horizontally (light household tools). Heavy saws are used for felling and bucking trunks, they have a large frame size. Lightweight saws are used for cutting branches or sawing firewood, they are usually acquired by owners of private houses, farmers, gardeners, etc.
The design of the tool is simple, which is a guarantee of high strength and reliability. The motor shaft through the clutch drives the drive sprocket, which moves the chain along the tire using the drive sprocket. The two-stroke engine does not need a camshaft, valve system and other elements, which also contributes to an increase in the reliability of the design.
The centrifugal clutch is equipped with two friction clutches that are pressed against each other at low shaft speeds, and when the rotational speed increases under the action of centrifugal force, they are pressed against the outer part of the clutch and set the drive sprocket in motion. The engine power determines the type of chain. the more powerful the saw, the greater the chain pitch (the distance between the teeth, which determines the productivity of the tool).
Important! Using a circuit incompatible with the motor will result in loss of tool performance.
What fuel to use for a chainsaw?
Choosing the right fuel is an important and significant issue. The only correct approach to solving it is to carefully study the user manual, which indicates the type and brand of fuel, the proportions of mixing gasoline and oil, and also reflects all the features of this tool. Modern standards require the use of high-octane purified fuel and special types of engine oil.
Many people are interested in which gasoline chainsaw works best. Most models require clean, high-quality fuel with an octane rating of no higher than 90. Sometimes there are recommendations on the net to mix 92 or 93 gasoline with 95 to increase its efficiency. In no case should this be done, since higher-octane brands are often faked, and nobody will dilute the A92 or AI92 brands.
Therefore, choosing which gasoline to pour into a chainsaw in the domestic market, it is recommended to use just such fuel. It is necessary to ensure that gasoline is fresh enough, since during prolonged storage in it begins the release of resins and other elements that impair quality. Manufacturers recommend using:
- Chainsaw Stihl (Stihl) 180. It is better to refuel with gasoline of brand A90 and higher;
- Stihl 250. runs on gasoline with an octane rating of at least 90. Do not use fuel with an ethanol content exceeding 10%;
- Partner. it is necessary to use only unleaded gasoline with an octane rating of at least 90;
- Husqvarna. gasoline with an octane rating of at least 90, it is allowed to use clean fuel or with the addition of tetraethyl lead. Engines with a catalyst require the use of a fuel-oil mixture of unleaded gasoline.
As a rule, the owners of such tools use AI92 gasoline, which is fully consistent with the requirements of manufacturers. However, for most domestic chainsaws, A72 or A80 gasoline is quite suitable. It must also be borne in mind that the failure of a chainsaw due to the use of low-quality fuel is not a guarantee case.
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In a chainsaw, two types of oil are used. motor and chain (adhesive). They should not be confused, because the tasks they perform are different from each other. Any gear oil can be used to lubricate the chain, although manufacturers always recommend using the same materials. Engine oil requirements are tougher. In this matter, all manufacturers are unanimous. you should use the oil of the same company that made the saw.
Two-stroke engines lack a lubrication system that is replaced by the presence of a certain amount of material in the fuel. The carburetor injects fuel and oil mist, which simultaneously lubricates all the details. after that, the residues are burned in the cylinder. If no specific instructions are provided, any push-pull oil can be used.
For different models of the tool, manufacturers recommend:
- for chainsaw Stihl 180. the best option is STIHL HP, HP SUPER or HP ULTRA oil;
- Stihl 250. use STIHL HP, HP SUPER or HP ULTRA oil correctly; STIHL HP ULTRA oil is most effective;
- Partner. any two-stroke oil. It is forbidden to use automobile or marine oil, this will lead to engine failure;
- Husqvarna. The manufacturer recommends the use of HUSQVARNA push-pull oil. It is forbidden to use oil for four-stroke engines, or for two-stroke engines with water cooling.
Important! Not all types of oil are commercially available in Russia, so sometimes you have to change them to other available types. The most successful option is the use of synthetic high-quality materials.
For beginners, the question of how to refuel a chainsaw is especially relevant. However, the refueling process itself is not of any complexity. The main task is to compile a fuel-oil mixture with the correct proportions. They are indicated in the tool manual. Before refueling, you should carefully study the information provided by the manufacturer in order to exclude the possibility of errors in the preparation of the fuel mixture.
The ratio of gasoline to oil
The standard ratio of oil to gasoline, relevant for most chainsaws, is 1 to 50. This means that for 1 liter of gasoline you need to add 20 ml of oil. However, each manufacturer has its own requirements for the composition of the fuel mixture, which are due to the design of the engine, the features of its parameters and other factors. It is impossible to determine independently which proportions are best suited for a given instrument.
Full and accurate information can only be obtained from the user manual. If it does not contain any instructions regarding the composition of the fuel mixture, then you should adhere to generally accepted practice and compose it in a ratio of 1: 50. There are other options, from 1: 20 to 1: 50.
Figure 3. The ratio of oil and gasoline for the fuel mixture
How to mix the fuel mixture?
The mixing process is quite simple. you need to measure a certain amount of oil and pour it into the appropriate volume of gasoline. It is necessary to prepare a clean container in which mixing will take place. Plastic canisters are commonly used, which are quite suitable for this purpose. However, some species have a serious drawback. they accumulate static electricity, which can lead to the formation of a spark and ignition of the fuel mixture.
The best option is to use a special canister with two necks, into which gasoline and oil are poured, but they are quite expensive. For accurate dosing of oil, many use medical tick mark syringes. The more carefully the quantity of the mixture is measured, the longer the service life will be and the higher the quality of the tool.
Attention! Do not mix gasoline and oil directly in the tool tank. Read more on how to turn on the chainsaw.
Storage conditions for the finished mixture
Most users usually prepare the fuel mixture for future use. This is due to time savings. it is believed that it is more correct to mix a large volume once, and then simply add fuel to the tool tank. This view is acceptable, but with important limitations. The finished mixture can not be stored for too long, as irreversible changes occur in it.
Ideally, you need to cook it only for one day, but this is considered by many to be too irrational. The permissible shelf life depends on the ratio and brand of components. Most experts recommend not storing the mixture for more than 3 months. It is recommended to use metal cans and keep the mixture under a canopy, away from direct sunlight.
What errors and consequences may occur?
The main mistake made by inexperienced owners of chainsaws is an attempt to save on expensive oil. Often, users try to slightly lower the oil content, believing that this will not be any serious problems. However, the consequences of such savings can become very deplorable. a lack of lubrication will cause overheating of parts, which will negatively affect the overall performance of the tool.
The most serious consequences of such actions include piston jamming in the cylinder, which will require major repairs. Sometimes it is more expensive than buying a new tool. Therefore, you should not save on oil, just following the manufacturer’s instructions exactly will help you get maximum performance and a long service life from the chainsaw.
No less harmful can be the consequences of an excess of oil. On the use of such a fuel mixture in the cylinder, carbon deposits are formed, which will cause damage and the need for serious repairs.
A properly prepared fuel-oil mixture for a chainsaw is an essential condition for high-quality and productive work. It should not be considered that a small change in the proportions is not scary and will not bring serious problems. Only careful observance of the manufacturer’s requirements and accuracy in the preparation of the mixture guarantees the user full compliance with the operational parameters of the instrument to the stated indicators.