Chainsaw fuel consumption is calm

Descriptions of the Stihl MS-250 chainsaw

The chainsaw “Shtil” MS-250 is a semi-professional portable chain tool designed for cutting down trees, collecting fuel, pruning trees, using in landscape design, using in the construction of wooden buildings, sawing boards, etc. The weight of the chainsaw is 4.6 kg.

The manufacturer equipped the saw with an original Stihl single-cylinder petrol two-stroke engine with a capacity of 3.1 liters. With. The unit is started using a manual starter. The starting system is facilitated by a decompression valve. The carburetor is an original membrane type with a built-in compensator, which prevents the speed from falling during operation and improves the quality of the exhaust gases (the combustible mixture burns as completely as possible).

Side mounting of the tire with 4 bolts, easy access, protection of the operator’s hands. Tire size - 35 cm. Oilomatic chain 1.3 mm thick. has a pitch of ⅜ inches. Chain lubrication is automatic and supplied to specific points, saving lubricants by 50%. There is an automatic chain brake. Handles with vibration protection.

The basic package for the Shtil MS-250 chainsaw includes:

• tire 14 inches;
• tire 16 inches;
• Oilomatic chain;
• screwdriver key;
• tire cover;
• instructions.

Components of the Stihl MS-250 chainsaw

Chainsaw Stihl MS-250 technical specifications:

Features Stihl 250 and 250 C-BE

To improve the performance of the Stihl 250, the designers installed several modern developments on the chainsaw that best affect the comfort and quality of the chainsaw. The first thing we'll talk about is the compensator.

Compensator

A special device is installed in the carburetor cover and connected to the air filter housing by a separate small channel. The essence of the compensator is that it allows air to flow into the carburetor in addition to the fuel filter. This is necessary at a time when the air filter is as dirty as possible and does not allow the required amount of air engine to be produced.

On chainsaws that are not equipped with a compensator, a dirty fuel filter can lead to increased fuel consumption and excessive enrichment of the fuel mixture. This can eventually result in soot under the piston rings and bullets. Accordingly, the saw will require expensive repairs, and the compensator can be insured against all this.

Carburetor heating

This feature is most useful in winter as it prevents carburetor icing. The operator turns the option on and off as needed. To change the mode, you need to move the valve, which redirects the flow of warm air to the carburetor or vice versa.

Chain brake

One of the safety mechanisms when working with a chainsaw is a manual inertial chain brake. If for any reason the chainsaw bar comes to a sudden stop, the brake will be applied and the chain will instantly stop rotating, reducing the risk of serious injury. For the chain brake to operate correctly, the operator must comply with several conditions:

1. Keep your hands as instructed, i.e. Left hand on the front handle, right hand on the back.
2. Clean the mechanism in time, because it is located in the side cover, where a huge amount of sawdust gets trapped.

Vibration reduction system

The chainsaw engine vibrates during operation. Vibration can be inconvenient and reduce operator time due to fatigue. To solve this problem, German engineers equipped the Stihl 250 with an anti-vibration system of effective shock absorbers. Thus, the Stihl 250 can be used for work even by those who have chronic hand diseases.

READ Stihl Chainsaw How to Remove Cylinder

Combined control

Another convenience system designed to make the Stihl 250 easier to operate is the combination control lever. Due to this, the ignition is turned on and off with the thumb of the left hand. The suction mode is activated in the same way. You never have to look for the switch, it's always at hand, which is especially convenient in an emergency.

Ematic

This is an officially patented Stihl system that is designed to reduce friction and increase the life of the saw set. The system includes not only the part installed on the chainsaw, this is the oil pump and transport lines, but also the bar and chain of the chainsaw.

Characteristics and advantages of the Stihl MS-250 chainsaw

Let's get acquainted with the advantages of the German-assembled Stihl chainsaw:

1. Reliable, durable tool.
2. Original spare parts are interchangeable (with other modifications).
3. High build quality.
4. Possibility to choose the right tire size.
5. Automatic and economical lubricant supply.
6. Possibility to select the necessary chain - Oilomatic or Picco with pobeditovy tips.
7. Unpretentiousness in care and operation.
8. High safety of all components and mechanisms.
9. High power and torque.
10. Easy launch.
11. Anti-vibration protection.
12. The presence of a compensator in the carburetor.
13. Easy access to the air intake.
14. Reusable air filter.
15. Simplified single-lever control.
16. Protection from atmospheric precipitation.
17. The chainsaw is easy to repair.
18. Among the shortcomings, there is only one - the high price of the saw itself and its spare parts.

How to eliminate the risks of purchasing counterfeit goods?

On the domestic market, there are a small number of more or less successful copies of popular branded chainsaws, which are an order of magnitude inferior to branded designs in terms of reliability and durability.

Additionally: Chainsaw chain - markings and a guide for beginners on selecting chains

There are many ways to distinguish an original from a fake, but the most reliable option for purchasing a quality instrument is to contact a company store or a sales office of an official dealer. The above fully applies to the entire range of replacement equipment and consumable components.

User manual

The instruction manual is an invariable companion of gas-powered tools. It contains complete information about the chainsaw itself and describes detailed principles of working with it.

Each instruction must contain the following sections:

1. The structure of the unit in diagrams and with descriptions.
2. Table with technical characteristics of the MC 250 model.
3. Conditions for the safe use and maintenance of a Stihl chainsaw.
4. Preparing the tool for work.
5. Running in the Stihl MS-250 chainsaw.
6. Maintenance.
7. Malfunctions in operation and the reasons for their occurrence.

Preparing the chainsaw for use

The period of uninterrupted operation of the Shtil chainsaw, as well as the safety of the owner of the equipment, which is important, depends on the correctness of the actions performed.

We offer a simple algorithm of actions:

• the unit is assembled according to the descriptions from the instructions;
• the saw set is connected and securely fastened;
• the chain is tensioned;
• the fuel mixture is prepared;
• the finished mixture is poured into the fuel tank;
• the oil tank used to lubricate the chain is filled with the appropriate lubricant;
• the operator once again checks the tension of the mounting bolts;
• the chainsaw starts;
• the operator adjusts the idle speed (correct setting - the chain does not rotate at idle);
• The supply of lubricant to the chain mechanism is checked.

In order to properly prepare the fuel mixture, you need to purchase high-quality AI-92 gasoline and original Stihl oil for two-stroke engines. The fuel to oil ratio is 50/1. That is, you need to take 5 liters. gasoline and 100 ml. motor oil. The liquids are mixed thoroughly, the unused fuel mixture is stored for no more than 1.2-2 weeks.

Running in a chainsaw

The original product does not require any specialized procedures; the saw is initially ready for use. However, the first 4-8 tanks of the combustible mixture must be burned out in a gentle mode - this means that the engine power should not exceed 50%. In addition, the first hour of operation consists of alternating cycles: 2 minutes of operation, 10 seconds - idling, rest, etc. Attention: idling for more than 15 seconds harms the spark plug - carbon deposits form on it.

Chainsaw Stihl MS-250 in action

Maintenance of the Shtil MS-250 chainsaw

Before starting operational work:

• the headset is checked;
• the chain is tensioned;
• the bolt tension is checked;
• working fluids (fuel mixture and oil) are poured into the corresponding tanks;
• check the presence of lubrication on the chain;
• Idle operation is checked.
• After carrying out operational work:
• the chain tension is weakened;
• the chainsaw is cleaned of dust, dust and dirt;
• the air filter is cleaned;
• The saw set is checked, if necessary, the chain is sharpened, the bar is changed.

Scheduled maintenance is carried out for:

• idle settings;
• carburetor cleaning;
• replacing spark plugs;
• troubleshooting minor problems.

If there are serious problems, it is recommended to contact service centers to resolve them; their addresses are indicated in the instructions.

We invite you to watch a video that shows how to disassemble the Shtil MS-250 chainsaw:

Another video will tell you how to set up the carburetor of the Shtil MS-250 chainsaw:

Malfunctions and repairs

Knowing the causes of the problems, you can fix them yourself and restore the functionality of your gasoline tool. We list the typical malfunctions of Stihl MS-250 chainsaws:

The chainsaw does not start:

• the fuel mixture has run out;
• poor quality of the fuel mixture;
• there is no contact on the spark plug;
• break of a high-voltage wire;
• the fuel pump does not pump;
• filling the candle;
• there is carbon deposits on the spark plug and it needs to be cleaned;
• spark plug failure (replace after 100 hours of operation);
• fuel lines are clogged;
• magneto failed;
• the carburetor is clogged;
• carburetor settings are lost;
• The starter rope does not pull or tighten.

The chainsaw cannot develop speed:

• the candle is smoked;
• spark plug needs to be replaced;
• The carburetor needs to be cleaned.

The Shtil MS-250 chainsaw starts and stalls at idle, the reason is that the carburetor settings have gone wrong.

Chainsaw Shtil 250 Doesn't Start Reasons

Content

What to do if your chain saw won't start

Good afternoon, dear readers and subscribers of my blog! At some inopportune moment, you may find that your chainsaw will not start. But don’t rush to immediately take a repair tool; perhaps you can fix this breakdown yourself. I'll tell you what to do in cases where the chainsaw

does not start, and how to find the right solution to this problem.

We analyze the possible causes of the breakdown

Find why the tool cannot be run in the instruction itself. But instructions don't always come.

Although each model has its own characteristics, in general they are all similar. Therefore, I will tell you about the possible reasons for the breakdown and possible solutions for different tools.

How the mechanism works

Almost all tools are organized in the same way, both foreign (Husqvarna, Makita, Shtil, Partner 350) and Chinese chainsaws, as well as domestic ones (Druzhba, Ural). Therefore, finding the reason why the device does not start or stop is not very difficult.

There are four elements where problems may arise:

• The fuel for which the carburetor is responsible;
• Lubrication;
• The air that enters through the air filter;
• A spark, the quality of which depends on the ignition unit.

They all depend on each other and interact with each other. If any element is not working correctly, the saw stops working.

Let's start with the fact that all tools are configured differently. hot and cold. Two commonly used mechanisms are responsible for this process.

READ How to Fuel a Shtil Chainsaw

Don't forget to look at what the user manual says. It says that when you engage, you need to make sure the emergency stop brake is locked. But starting a saw with a brake is much more difficult, so sometimes it is better not to apply the brake.

As you can see from the manual, there is a fuel tank and engine inside the body, and outside. saw section (bar with chain), handle and starter.

First we need to figure out exactly how the tool is not running. For example, the saw starts, but immediately catches the eye or loses the power of work, the quality cuts.

Possible interruptions occur due to problems in the engine. But I wouldn't recommend taking it apart immediately. It is better to look for the problem using the simplest option.

It is very important to consider the quality of the fuel. If the mixture is not prepared correctly or has deteriorated over time, even reliable tools such as Urals or Husqvarna 145 will not work. The instructions should indicate the proportions and specific oil for your chainsaw.

Another common problem. during startup, the user pours a candle. It needs to be checked, if it is completely dry, then the fuel does not pass into the cylinder.

Why doesn't the first chainsaw work?

sawing does not start

how to get there quickly.

STIHL saw for no reason.

It happens because of little things.

If you see black carbon deposits or a lot of fuel, the carburetor may not be adjusting the fuel properly.

If your sawtooth starts but stops immediately, the problem is locating the carburetor jet or fuel filter. Perhaps they are clogged.

To check if the baffle is damaged, you need to disconnect the fuel hose from the carburetor and see if fuel mixture flows out of it.

READ Chainsaw Motor Sich 475 Video Video

If the saw does not start hot, the problem may be with the muffler. Sometimes it becomes clogged with exhaust gases.

Quite often, saw rupture occurs due to a small amount of chain lube. This occurs with clogged channels or leaking oil pipelines.

Also check the pipe connections to the oil pump nozzles to see if they are leaking.

It is very bad when there is a failure in the cylinder. When checking it, you may find irregularities or chips, this could be the cause of the problem.

We restore the operation of the instrument

To restore the operation of the saw, it doesn’t matter the brand Ural or Calm, you need to know the location of the dislocation.

First, we check and change the inappropriate fuel mixture. If the saw still does not start, we check it further.

The problem is the spark plug. remove and dry. Do not pierce it under any circumstances, as this will cause the part to malfunction. After 30 minutes of drying, you can put the plug back in before checking to see if any fuel is still in place.

In addition, the candle may simply break, so it is better to get rid of the cause.

Another reason why the tool is severely damaged and stuck. this is poor contact between the spark plugs and the high-voltage wire. If everything is in order here, but there are still no sparks, the ignition module itself may be broken. Such a breakdown can only be eliminated by replacing it.

You should check and clean your air filters from time to time. If you haven't checked it since purchasing it, it could become clogged with dust and cause a malfunction.

In models such as Calm 180, Ural or Partner 350, breathing space is blocked, which often leads to breakdown. To clean it, you can use a sewing needle.

READ How to Make a Chainsaw Quieter

Stihl 180, Friendship, Ural and Huskvarna 142 models sometimes clog the muffler, this also needs to be checked and cleaned.

If the problem is in the carburetor, then without proper experience you should not try to fix it. It is best to contact specialists.

If, after checking and correcting the above problems, your saw does not start, then most likely the failure is hidden in the cylinder group.

When you see damage and chips on the piston or cylinder, you will have to replace these elements.

If the cause of a chainsaw malfunction is a plug that is leaking, it is likely that insufficient lubrication is supplied to the chain. To solve the problem, the pipes are only replaced and the seams are sealed with sealant.

Mechanism parts cannot last forever, so they will need to be changed periodically. To find out which part you need to look at the instructions.

Separately about the breakdown of the most common model

Let's look at the problems of Shtil 180 in more detail:

1. The carburetor or fuel filter is clogged. These are the most common problems and are very easy to fix after cleaning. Sometimes the filter needs to be changed;
2. Replacing the spark plug;
3. Sometimes it is necessary to replace the cylinder or oil seals.

Saw Stall is strong and durable enough that the breakdown can often be repaired on its own. In fact, the same applies to the Partner, Ural, Makita and Husqvarna models.

If you find a problem with your chainsaw, look for a small reason, gradually checking and eliminating the problems. Such problems can be easily solved on your own. But if the breakdown is serious and you do not have enough experience, then this should be done by a specialist.

Related videos

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Reviews of the Stihl 250

Alexander 32 years old Smolensk

I have been using a Stihl 250 chainsaw for over two years. I work almost every day, but not all day, but 3-4 hours, including rest breaks. I saw it and was pleased. There are no problems with this at all. He filled up with gasoline and oil and went to work. During the entire period of operation there was only one malfunction, the cord on the starter was broken. I wrote it down myself, the system there is very simple, everything is done in half an hour.

I only use branded oil and consumables, I don't spill it, so the tire is still original, and it's held up well, even though it's been sawed a lot.

Choosing between the 250 and 260 Stihl models

Readers have many questions about choosing Stihl 250 and 260 chainsaws.

You can answer unequivocally. The Stihl 260 saw is better because it is designed for professional use and has completely different production requirements than the Stihl 250 for agriculture.

Accordingly, the cost of these models has a significant difference. Stihl 260 sells for almost 50% more than Stihl 250. Of course, for those who do not want to pay for a professional tool and use it in households, it is certainly better to buy Stihl 260, but the 250 lasts for many years and almost does not kill at all. timely service and normal attitude.

Basic faults and DIY repairs

Like all gasoline units, the Stihl 250 chainsaw has basic problems that most often arise with it. Let's find out what these errors are and how to fix them yourself.

Starter cord and spring faults

One of the common breakdowns of any chainsaw is a broken starter cord or return spring. Fixing these problems is quite simple. To do this, remove the starter from the chainsaw (unscrew the four mounting screws). Next, use a pair of pliers to remove the plug from the starter's center shaft (in some cases the mechanism is secured with a screw), and then remove the washer and trigger.

READ What Chain Size For Stihl 180

To replace a chainsaw cord, the spool on which the cord is wound is removed from the central shaft and the uneven element is removed from the mount. A strong knot is created on the new cord, after which the cord is pulled from the end opposite the knot into the mounting hole on the reel and pulled through it.

Next, the reel, followed by the dog and the fork, are set in place, after which the cord is wrapped around the reel in a clockwise circular motion. The end of the cord is sewn through the starter body and a handle is installed on it, after which it is slightly stretched and secured with a knot. Thus, it turns out that the starter coil is constantly under low voltage, so the handle does not hang, but remains in its place.

If you need to replace a broken spring, it is convenient to do this after removing the cord reel. The new spring is installed upside down. Next, the starter is assembled in accordance with the algorithm described above.

Below is a video about repairing a Stihl chainsaw starter. The video is made in German, but the procedure is shown in as much detail as possible, and if necessary, it can be repeated even by those who have never repaired a chainsaw.

Replacing oil seals

Oil seals. This is a rubber element with a spring, which is installed on the motor shaft and protects against air ingress.

Once the seals become unusable (this happens over time on all chainsaw engines, as the seals are made of oil-resistant rubber and lose their elasticity over time), they need to be replaced as air leaks into the crankcase.

To replace the fat on the Stihl 250 yourself, you will need a special tool with which you can completely disassemble the chainsaw, as well as knowledge of all the nuances of disassembly and assembly.

Advice: if you do not have experience in repairing chainsaws, it is better to turn to professionals to carry it out.