Tuning The Carburetor Stihl 250

Stihl 250 chainsaw device

This professional gasoline saw is the most powerful tool in the range of the German brand Stihl. Its proprietary device includes a durable 1-cylinder 2-stroke liner engine with a cylinder volume of 45.4 cm3. The engine stands out for its low fuel consumption, built-in overheating protection, and increased torque. This allows the engine to successfully withstand prolonged loads with irregular sawing of logs in the longitudinal direction.

The device of the model includes a compensator. a separate element of the carburetor, the function of which is to continuously maintain the required power of the standard engine. The carburetor itself is equipped with a preheating system that allows you to smoothly start the engine before operating the chainsaw at low temperatures.

Tuning The Carburetor Stihl 250

The Stihl 250 chainsaw is equipped with a proprietary anti-vibration system, thanks to which the manufacturer was able to reduce the vibration of the engine transmitted to the handles. To supply air to the carburetor, a quick-detachable filter is provided in the garden tool set, which can be cleaned after removing a separate plastic cover.

For safety in the device of the Stihl 250 model, a chain brake is developed using the proprietary QuickStop technology. It instantly triggers when the chain hits a wire or nail, protecting the operator from kickback.

Chainsaw Stihl 250. malfunctions and repairs

Most often, the Stihl MS 250 chainsaw fails due to the use of low-quality fuel and engine oil, as well as due to wear of the main components of its device. To repair a model with your own hands, you need to find the exact cause of the breakdown and replace worn-out parts with quality parts.

The saw does not start. causes and elimination of breakage

If the Stihl chain saw does not start, then the first thing to carefully inspect is the garden tool’s ignition system, namely, the gap between the standard flywheel and the coil. For stable operation of the Stihl model, the distance between these elements should be 0.2 mm. If this parameter was violated, then it will need to be configured.

To adjust the gap between the built-in flywheel and the coil, you need to remove the left side cover and clean the parts underneath.

After that you will need:

  • Unscrew the 2 screws located above the flywheel counterclockwise;
  • Install a special template between the ignition coil and the flywheel;
  • Start turning the screws in the direction of the clock hands until the handwheel comes close to the template.

After adjusting the gap, you need to install the protective cover of the Stihl saw body and start the engine. Sometimes the motor will not start when the starter rope is first pulled. In this case, you need to continue trying until the internal combustion engine starts.

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Model Carburetor Tuning

The Stihl MS 250 professional chain saw requires carburetor adjustment in the following cases:

  • When the engine is unstable at idle speed;
  • In the case when the internal combustion engine starts up and immediately stalls;
  • With a sharp increase in the volume of fuel consumed;
  • With a noticeable increase in vibration of a running engine.

The fuel assembly is adjusted in the following sequence:

  • First, screws H and L on a chainsaw with a cold engine must be tightened clockwise until it stops. After that, both screws must be turned 1 turn in the opposite direction;
  • Next, you need to start and warm up the chainsaw engine. The operator must then press and hold the throttle trigger. At the same time, by turning the screw H, you need to achieve those maximum motor revolutions, which are indicated in the instructions for the saw. They should be 10,000 rpm;
  • Then you need to adjust the operation of the saw chain. To do this, the standard LA screw must be turned so that the chain starts to rotate slowly. After that, the LA bolt will need to be turned 1/4 turn counterclockwise.

A chainsaw with a properly tuned carburetor should operate as stable as possible in any mode. Fuel consumption and exhaust emissions should be reduced after unit adjustment. Otherwise, the carburetor setting will need to be repeated.

Technical characteristics of the Stihl MS 250 chainsaw

Stihl’s factory-set 250 chain saw features improved factory settings to handle the most demanding household and construction tasks.

The main features of the garden tool include:

  • Internal combustion engine power. 2.3 kW / 3.1 hp FROM.;
  • Chain speed at idle / maximum speed. 2,800 / 10,000 rpm;
  • Fuel tank. 470 ml;
  • Recommended bus length. 35–40 cm;
  • Chain pitch. 3/8 ";
  • Weight with saw headset. 4.7 kg.

When developing the Stihl MS 250 chainsaw, the manufacturer managed to achieve a low noise level of the engine running. When operating under maximum loads, this parameter of a garden tool is 105 dB.

Chainsaw Stihl (Stihl) MS 250

Chainsaw of the German brand Stihl in the 250th modification is a reliable garden tool that stands out against the background of analogues by its high endurance, productivity and an impressive supply of traction. The Stihl MS 250 chainsaw is well suited for cutting dry and rotten branches, as well as cross-cutting logs.

The device and purpose of the chainsaw Stihl 250

The Stihl 250 chainsaw model is versatile, designed to perform a wide range of work. from the construction industry to landscape design. With its help, you can harvest firewood, cut large logs, boards, form crowns of trees or bushes.

The saw device is classic for this manufacturer. The main component is a two-stroke engine that runs on a mixture of gasoline and oil. The engine speed is transmitted through the sprocket and guides to the guide bar. The operating mode is controlled by the control levers, which are located on the ergonomic handle. The vibration elimination system also contributes to ease of operation. The heated carburetor allows you to start the saw without any problems, even at low temperatures. There is also an economical lubrication system, an emergency brake, a smooth start, a quick tensioning system for the saw blade.

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Chainsaw Stihl (Stihl) 250: device, characteristics, setting

The Stihl MS 250 chainsaw is one of the most powerful, productive tools in the semi-professional class. However, its design, construction and performance are not inferior to other saws from the professional category. The high quality and performance of this model confirms the trust of buyers, as well as the high demand in the market.

Chainsaw Stihl 250: malfunctions and repairs

Every tool needs maintenance from time to time. This ensures its high-quality, trouble-free operation for a long time. But repairs or minor problems can hardly be avoided.

The main causes of breakdowns:

  • Improper use of the tool;
  • Use of non-original, low-quality parts or fuels and lubricants;
  • Neglect of maintenance or prevention.

Sometimes a situation arises when the chainsaw will not start.

There may be several reasons for this:

  • Clogged or defective fuel system.
  • No ignition spark.
  • Ignition coil breakage.
  • Failure of crankshaft bearings.
  • Incorrect setting or clogged carburetor.

The first thing to check is the availability and quality of the saw fuel. Next, the ignition system is examined for faults. If, upon inspection, it is found that the engine is flooding a candle, you can fix the malfunction yourself.

The reasons for this trouble may be a carburetor malfunction or improper start of the chainsaw. To start the saw, you need to unscrew the candle, dry it, drain the remaining fuel from the cylinder. The dried candle is installed in place, the presence of a spark is checked. Next, the carburetor is adjusted.

Stihl 250 features and specifications

High quality materials and workmanship ensure efficient operation in various conditions. The Stihl 250 chainsaw is capable of sawing wood along or across. Fuel economy is achieved by fine tuning the fuel system.

Has the following technical characteristics:

  • Power. 3.1 liters. FROM.;
  • Chain pitch. 3/8 ”;
  • Chain thickness. 1.3 mm;
  • Fuel tank capacity. 470 ml;
  • Oil container. 200 ml;
  • Standard bus length. 30 cm;
  • Weight. 4.6 kg.

When buying, pay attention to such features so as not to purchase a low-quality fake:

  • The fake has a rough, fragile plastic protective casing;
  • Logos other than those officially declared by the Stihl trademark;
  • Atypical spark plugs;
  • Lack of serial numbers;
  • The presence of simplified carburetors.

When repairing or replacing spare parts, also select original accessories from the manufacturer Stihl.

Do-it-yourself Stihl 250 chainsaw carburetor adjustment

Carburetor tuning should be done in several cases.

In addition to a flooded candle, there may be such adjustment reasons:

  • The saw stalls under load or at idle speed;
  • Changing the type of fuel;
  • Change in operating conditions (temperature, load, altitude).

The essence of the setting comes down to adjusting the jets. All operations are carried out with the motor running. The cylinder should warm up to its optimum operating temperature. The process of tuning the carburetor of the Stihl chainsaw is demonstrated in stages:

8 thoughts on “Adjusting your chainsaw carburetor with the STIHL MS 250”

What is the distance on the starter from the poles to the module ?, what is the correct adjustment of the chainsaw carburetor ?, Stihl 250 ms

Do-it-yourself Stihl 250 chainsaw carburetor adjustment

Carburetor tuning should be done in several cases.

In addition to a flooded candle, there may be such adjustment reasons:

  • The saw stalls under load or at idle speed;
  • Changing the type of fuel;
  • Change in operating conditions (temperature, load, altitude).
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The essence of the setting comes down to adjusting the jets. All operations are carried out with the motor running. The cylinder should warm up to its optimum operating temperature. The process of tuning the carburetor of the Stihl chainsaw is demonstrated in stages:

Chainsaw Stihl 250. malfunctions and repairs

Most often, the Stihl MS 250 chainsaw fails due to the use of low-quality fuel and engine oil, as well as due to wear of the main components of its device. To repair a model with your own hands, you need to find the exact cause of the breakdown and replace worn-out parts with quality parts.

What to do if floods a chainsaw candle?

The cause of this malfunction is the use of an incorrectly mixed fuel mixture. As a result, excess engine oil flows onto the spark plug and, over time, accumulates on it in the form of carbon deposits.

To solve the problem, you need to unscrew the candle and clear the space under it. Next, you need to remove all accumulated carbon deposits from its surface and rinse the part with clean gasoline. After complete drying, the candle must be screwed into place and continue to operate the saw.

Model Carburetor Tuning

The Stihl MS 250 professional chain saw requires carburetor adjustment in the following cases:

  • When the engine is unstable at idle speed;
  • In the case when the internal combustion engine starts up and immediately stalls;
  • With a sharp increase in the volume of fuel consumed;
  • With a noticeable increase in vibration of a running engine.

The fuel assembly is adjusted in the following sequence:

  • First, screws H and L on a chainsaw with a cold engine must be tightened clockwise until it stops. After that, both screws must be turned 1 turn in the opposite direction;
  • Next, you need to start and warm up the chainsaw engine. The operator must then press and hold the throttle trigger. At the same time, by turning the screw H, you need to achieve those maximum motor revolutions, which are indicated in the instructions for the saw. They should be 10,000 rpm;
  • Then you need to adjust the operation of the saw chain. To do this, the standard LA screw must be turned so that the chain starts to rotate slowly. After that, the LA bolt will need to be turned 1/4 turn counterclockwise.

A chainsaw with a properly tuned carburetor should operate as stable as possible in any mode. Fuel consumption and exhaust emissions should be reduced after unit adjustment. Otherwise, the carburetor setting will need to be repeated.

Checking acceleration work

A little research needs to be done. Device acceleration is initiated. The serviceability of the engine should be assessed during the maximum revolutions. When the engine is functioning correctly, then when you press the accelerator, the speed quickly increases to 15,000 rpm.

If this does not happen or the speed increase is too slow, you must use the screw marked with the letter L. Carburetor repair lawn mowers and chainsaws repair the Stihl trimmer with your own. It turns counterclockwise. Moderate movements must be observed, since the turn cannot be more than 1/8 of a full circle.