Chainsaw Shtil 250 faults and repairs

About the carburetor design

The carburetor serves to mix the flammable mixture with air while maintaining predetermined proportions.
If clear doses are not followed, the proper operation of the engine is at risk. When a huge amount of air enters during mixing of the components, but there is not enough fuel, then such a mixture is considered “lean”. Oversaturation should not be allowed, because with a large amount of fuel compared to air, malfunctions or engine wear are also likely. Carburetor adjustment is needed not only before initial use, but also when any differences in its operation are detected. Before working with a chainsaw, do not forget to run it in.

Carburetor components

The carburetor design contains a standard set of parts, but may vary slightly depending on the manufacturer. Components:

1. The basis. This is a special tube that is visually similar to an aerodynamic design. Air passes through it. In the transverse direction, a damper is located in the middle of the pipe. Its position can be changed. The more it is extended into the passage, the less air enters the engine.
2. Diffuser. This is the constricted part of the tube. With its help, the air supply speed increases precisely in the segment from which the fuel comes out.
3. Channels for fuel supply. The fuel mixture is contained in the float chamber, then passes into the nozzle, from which it flows into the atomizer.
4. Float chamber. It is a separate structural element, reminiscent of the shape of a tank. Designed to constantly maintain the optimal level of fuel fluid before entering the channel from which air enters.

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Lean and rich mixtures

A little more about “poor” and “rich” consistencies.

Read:

A “rich” mixture is a fuel mixture in which the amount of fuel supplied to the carburetor exceeds the norm. In this case, the fuel does not have time to burn one hundred percent and less energy is produced than with a rational ratio of fuel and air. Some of the unspent fuel ends up in the muffler, which causes the chainsaw to smoke a lot.

There is excess air in a “poor” consistency, which is not great, because it has its drawbacks. Specifically: insufficient energy during a flash (which means a loss of power in the end), excessive heating of the cylinder due to insufficient lubrication and high speeds, which leads to roughness, and then not far from “jamming” of the engine.

A little more about “poor” and “rich” mixtures.

There is excess air in a “lean” mixture, which is also not good, as it has its drawbacks. Namely: insufficient energy during a flash (which means a loss of power as a result), excessive heating of the cylinder due to insufficient lubrication and high speeds, which leads to scuffing, and then it’s not far from “jamming” of the engine.

What you need to have for setup

Before adjusting the UPT, you must make sure that both filters (air and fuel) are clean. In addition, there should be no air leakage into the engine from the side (through the seals, the gasket under the UPT or its accelerator pump, or anywhere else), otherwise it will not be possible to adjust the carburetor.

Preparing to adjust the carburetor

Almost any UPT is adjusted with 3 screws:

1. 1. The main jet bolt, designated "H" and used to set the maximum speed of the saw motor.
2. 2. Idle jet bolt, designated “L” and used to set low speed. That is, to regulate idle speed.
3. 3. Idle speed adjustment bolt, designated in various cases, “LA” (Stihl), “T” (Partner, Husqvarna).

There are also carburetors with fewer adjustment screws. In this way, manufacturers protect their products from unprofessional intervention and at the same time try to simplify their setup.

For safe regulation during its implementation, the following rules should be followed:

1. 1. The tool must be firmly installed on a flat surface of a rigidly fixed object (workbench, rack, table).
2. 2. The chain should be directed away from yourself and others present.
3. 3. There must be a safe distance between the chain and any surrounding objects to ensure that they cannot come into contact with each other.

In such cases, you can adjust the carburetor on a chainsaw as follows. First, we start the tool and warm it up for 10 minutes.

We begin adjusting the UPT by determining the position of the adjusting screw “L”, at which the idle speed will be the highest. To do this, very slowly and smoothly turn this bolt in one direction, then in the other. And so on several times until the desired position is found. After this, turn “L” 1/8–1/4 of a turn (the required value is indicated in the technical documentation for the tool) counterclockwise (hereinafter referred to as FC).

Then we continue adjusting the idle speed using the screw “S” (“LA”, “T”):

• If the chain is motionless after manipulating the bolt “L”, then you need to smoothly rotate “S” (“LA”, “T”) clockwise (hereinafter referred to as POCHS) until it starts to move. Then we tighten the “S” 1/8–1/4 turn back.
• If the chain moves, rotate “S” (“LA”, “T”) of the frequency control unit until it stops, and then twist “S” 1/8–1/4 turn in the same direction.

The engine should run smoothly. And we check it, how it accelerates. It is considered that the engine is working normally in acceleration mode if, when you smoothly press the accelerator, the speed increases to its maximum value in a short time and without “dips.” If the engine runs unevenly and/or accelerates poorly, then you need to slightly - a maximum of 1/8 of a whole turn - turn the “L” of the CV joint.

Checking the operation of the chainsaw

Now we check the setting of the adjusting bolt “H”. To do this, we accelerate the engine to maximum speed. You just can’t drive it for a long time without load, you have to take breaks. We look at the exhaust and listen to the operation of the engine. If too much bluish smoke comes out of the muffler, and the chain saw makes a lot of noise, it means the carburetor is making the mixture too rich.

When the chainsaw makes a squealing sound, the engine gets very hot, the exhaust is accompanied by a crackling sound and/or misfires are heard, that is, detonation is occurring - the mixture is too lean, and the maximum engine speed is higher than it should be. This leads to overheating of the power unit, burnout of the piston, rapid wear of the cylinder and burnout of the spark plug. In this case, you need to turn “H” 1/4 turn.

To complete the adjustment, check the saw at idle speed. With a correctly adjusted UPT, it should work like this:

1. 1. The chain is stationary.
2. 2. The engine sounds almost like a four-stroke.
3. 3. Pressing the accelerator leads to a rapid increase in maximum speed.

If these conditions are not fully met, you should use “S” (“LA”, “T”) as indicated above, or repeat the setting from the very beginning.

This is how an approximate adjustment is made. For accuracy you need a tachometer. We do the same thing, only we turn the adjusting bolts, focusing on the readings of this device. This will allow you to accurately and, most likely, adjust the carburetor the first time, achieving, depending on the model of the tool for working with wood, an idle speed setting of 2800–3300 rpm or higher and a maximum speed of 11000–15000 rpm. Which ones should be set should be looked at in the technical documentation (operating instructions) for the saw.

After maintenance, such as disassembly and washing, or previous unsuccessful attempts to adjust, this unit may become completely out of alignment. So much so that the chain saw will not start at all. In this case, it is necessary to configure the engine power system in 2 stages, conventionally called:

• basic – with the engine not running;
• final - performed on a warm engine.

At the first stage, slowly screw in the adjusting screws “L” and “H” until they stop. In this case, you do not need to make a lot of effort and try to tighten them. Then we turn both screws back - for many models of saws by 1 turn. And for some - by 1.5 turns. There may be other settings. This must be clarified in the technical documentation for the chainsaw. For a number of models, the hint is printed directly on the cover of their case near the adjusting screws.

This will perform the recommended factory base carburetor setting. In this case, we do not touch the screw “S” (“LA”, “T”) under any circumstances, unless, of course, it has already been turned. When it is already twisted, you will have to work with it. Slowly screw in the “S” of the PRChS until it stops.

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Let's move on to the final stage. We are trying to start the engine. If there were no manipulations with the “S” (“LA”, “T”) adjustment and “L” and “H” were set exactly as recommended, then it should start.

If “S” had to be turned on for the reasons stated above, then the engine most likely will not start right away. After each attempt, it will be necessary to tighten this screw 1/4 turn and try to start the engine again. It has to make money eventually.

Setting up the carburetor

Then warm up the engine for 10 minutes. If, after starting it or during the warming up process, the motor operates unstably or the chain begins to move, then you need to slowly and carefully rotate “S” (“LA”, “T”) of the frequency control unit. As soon as the engine starts running steadily and/or the chain stops, we immediately stop adjusting. If the engine stalls, then tighten this screw 1/8–1/4 (look in the technical documentation) of the POCHS turn.

During the warming up process, the idle speed may begin to increase, then, again, it will be necessary to “S” (“LA”, “T”) to begin to slowly turn up the frequency control until they become normal by ear. With the engine already warm, we continue adjusting the power system unit, as described in the previous chapter.

A chainsaw is a technically complex tool that needs to be serviced from time to time. Cleaning, replacing filters and, of course, adjusting the carburetor of the chainsaw will help it last its entire lifespan. In this article we will look at the issue of carburetor tuning. How and why it is carried out.

Each carburetor owner must have the necessary tools to adjust this system. There are three adjustment screws that are located on the body of the device. They have their own markings:

• L - screw for correcting low speeds.
• H - screw for adjusting high speed.
• T - regulates idle speed, in most cases used for experiments.

Chainsaw air filter

Before adjusting the carburetor, you need to prepare the device:

1. The engine warms up, that is, it starts about 10 minutes before repairs, and turns off when starting work (see how to start a chainsaw).
2. The air filter is checked and washed.
3. The chain is stopped by turning screw T until it stops (see chain oil).

To carry out a safe repair, you need to prepare a flat surface where you can carefully place the device and turn the chain in the opposite direction. Need a tachometer. It determines whether there is a malfunction in the carburetor. When turning the screws, the sound should be perfect and absolutely smooth. If you notice squealing notes, the mixture is oversaturated.

Carburetor adjustment is divided into two main stages. The first one is called basic. It is performed with the engine running. The second is performed when the engine is warm.

To carry out the carburetor setup procedure successfully, you need to read the operating instructions for a specific model in advance to identify additional features of setting up the device.

To correctly configure the carburetor of a Chinese chainsaw, you must first remember the factory settings of the device, then turn on the engine. Subsequently, you will have to leave it running for several hours in order to accurately set your own parameters. Sometimes work is carried out only after ten minutes of engine operation, but many Chinese-made models require special handling.

Chinese chainsaw model

Adjustment procedure:

1. Activities begin in idle mode. Using the adjusting screws, you need to achieve a systematic increase in engine speed, so you should first let it run at low speeds. A deviation from the norm is the movement of the chain along the bus. In this case, you need to adjust the outer screws to the optimal position so that the chain remains motionless.
2. The transition to medium speed speed is carried out. Sometimes the engine starts to smoke. This defect can be eliminated by tightening the screw to supply a leaner fuel mixture.

Setup instructions

If a situation arises when the tool needs repair for greater performance and fuel economy, adjusting the carburetor with all the accompanying operations will be an inevitable undertaking. Adjusting the carburetor of lawn mowers 55, 250 etc. And so, when performing the options for the carburetor system of the saw 80, you need to:

1. Clean the fuel tank and air filters for better performance.
2. Locate screws H, L and S on the carburetor.
3. Using the indicated screws, make the basic options of the stihl 180 flammable mass mixer, performed with the engine turned off: using the annotation, set precise angles of rotation of screws H and L, which regulate the ratio of gasoline and air, where screw H is the highest speed screw that controls the nozzle; L – low speed screw; S – idle speed accuracy screw. When setting the basic values, slowly turn H and L clockwise, and after stopping, return to the position 2 turns back.
4. Turn on the engine and do the final adjustment of the Calm carburetor yourself. Find the highest idle speed by turning screw L in different directions. Once the maximum is found, the screw is returned to 1/4 of the clock speed. Optimal settings for a chainsaw carburetor, adjusting the carburetor ms 250 ms 660 p340s partner. If the chain moves, the idle screw is returned until it stops completely.
5. Perform technical checks and adjustments of acceleration and maximum speed.

A chainsaw is a technically complex tool that needs to be serviced from time to time. Cleaning, replacing filters and, of course, adjusting the carburetor of the chainsaw will help it last its entire lifespan. In this article we will look at the issue of carburetor tuning. How and why it is carried out.

Each carburetor owner must have the necessary tools to adjust this system. There are three adjustment screws that are located on the body of the device. They have their own markings:

• L - screw for correcting low speeds.
• H - screw for adjusting high speed.
• T - regulates idle speed, in most cases used for experiments.

Read:

Chainsaw air filter

Before adjusting the carburetor, you need to prepare the device:

1. The engine warms up, that is, it starts about 10 minutes before repairs, and turns off when starting work (see how to start a chainsaw).
2. The air filter is checked and washed.
3. The chain is stopped by turning screw T until it stops (see chain oil).

To carry out a safe repair, you need to prepare a flat surface where you can carefully place the device and turn the chain in the opposite direction. Need a tachometer. It determines whether there is a malfunction in the carburetor. When turning the screws, the sound should be perfect and absolutely smooth. If you notice squealing notes, the mixture is oversaturated.

Carburetor adjustment is divided into two main stages. The first one is called basic. Correct adjustment of the carburetor of chainsaws 180, 250, 260 and all models of stihl chain saws with your own hands. It is performed with the engine running. The second is performed when the engine is warm.

To carry out the carburetor setup procedure successfully, you need to read the operating instructions for a specific model in advance to identify additional features of setting up the device.

To correctly configure the carburetor of a Chinese chainsaw, you must first remember the factory settings of the device, then turn on the engine. Subsequently, you will have to leave it running for several hours in order to accurately set your own parameters. Sometimes work is carried out only after ten minutes of engine operation, but many Chinese-made models require special handling.

Chinese chainsaw model

Adjustment procedure:

1. Activities begin in idle mode. Using the adjusting screws, you need to achieve a systematic increase in engine speed, so you should first let it run at low speeds. A deviation from the norm is the movement of the chain along the bus. In this case, you need to adjust the outer screws to the optimal position so that the chain remains motionless.
2. The transition to medium speed speed is carried out. Sometimes the engine starts to smoke. This defect can be eliminated by tightening the screw to supply a leaner fuel mixture.

In this case, the smoke will disappear, but the engine speed will increase. You need to adjust the settings until you reach a level where, when you press the throttle, the engine smoothly picks up speed, and no sudden jerks or interruptions are heard.

• The device's engine is being checked. The chainsaw is switched to minimum speed, and then the lever is quickly pressed. When pressed maximally, it is held for 3 seconds. If there are problems with the engine, you need to gradually loosen the screw until the optimal position is reached.
• The chainsaw should work for several hours in real conditions. You need to cut wood, and then inspect all the elements involved in this event. If there are deviations, they must be corrected using adjusting devices. When all defects have been eliminated and the optimal settings have been established to supply correctly concentrated fuel, the device setup process can be considered complete.

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Stihl ms 361 will not start. Carburetor repair. Carburetor adjustment

Spare parts Repair of Stihl ms 361 chainsaw. Carburetor adjustment.

The engine is turned on at medium speed and warms up for about 10 minutes. The screw responsible for adjusting the idle speed should move clockwise. It is released only when the engine reaches stable operation mode. It is necessary to ensure that the chain does not move during this process.

In idling mode, the engine may stall (the reason is here). In this case, you must immediately turn the adjusting screw clockwise until it stops. Sometimes the chain starts to move. In this case, turn the adjusting screw in the opposite direction.

STIHL MS 180 HOW TO ADJUST THE CARBURETOR How to adjust carburetor STIHL chainsaw MS 180

How to adjust the carburetor Stihl ms 180 what are the min and max speeds? Also a similar video about adjustment on mine.

Read:

The carburetor adjustment of Shtil 180, 170 and other low-power chainsaws is done with only one screw - “LD”. They are set to idle speed.

The basic default setting is as follows:

1. 1. Fully tighten the “LD” of the PDFS until it is firmly seated.
2. 2. Then we turn it back 2 turns.

If you need to make additional or other adjustments, you must first warm up the engine for 10 minutes. Then if:

• idle speed is too low - turn the “LD” POChS until the chain starts to move, then turn this bolt back 1/2 turn, POChS;
• the tool chain moves at idle speed - slowly turn the “LD” of the frequency control unit until it stops, after which we turn this bolt another 1/2 turn in the same direction.

It’s better to adjust with a tachometer, not forgetting that the chain should not move at idle. The maximum no-load speed of the Shtil 180 and 170 models is 13500 rpm. Idle – 2800 rpm.

Adjusting the carburetor of a Stihl chainsaw equipped with a more powerful engine is done in the same way as described in previous chapters. This also applies to the most popular models such as Shtil 210, 230 and 250. For basic settings (discussed in the third chapter), “L” and “H” after tightening are turned back 1 turn.

The angle (step) of rotation of the adjusting bolts during adjustment of the UPT is 1/4 turn. The idle speed of the Stihl 210, 230 and 250 models is 2800 rpm, the maximum without load is 13000 rpm.

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How to adjust the carburetor Stihl ms 180 what are the min and max speeds? And also a similar video about adjustment on my

How to Adjust the Idle Speed ​​of a Shtil 180 Chainsaw

Carburetor Sthil MS180 (Shtil 180). Adjustment - no, I haven’t heard...

For chainsaws Shtil

MC 180 are currently being produced and in the last short period of time, Chinese-made carburetors have been installed, having only one adjustment screw. Such membrane-type carburetors are actually not intended for disassembly, since it is completely sealed and filled. So to say: “Adjustment - no, I haven’t heard...” In this case, it is easier to purchase a Shtil 180 chainsaw carburetor; carburetors are sold both unique (also made in China, but at a plant owned by STIHL) and from third-party (also Chinese) manufacturers.

It should be noted that despite being a Chinese creation, the unique Shtil 180 carburetors are very reliable and rarely let their owners down. The cost of a unique carburetor for a Stihl 180 and even a non-unique one varies greatly. For example, if a non-original carburetor on the Internet costs from 700 rubles, then a unique one costs 2,500 rubles, in other words, almost 4 times more expensive.

For chainsaws manufactured for 5 or more years, you can purchase repair kits. The cost of a repair kit for a Shtil 180 carburetor ranges from 200 to 400 rubles.

STIHL MS 180 HOW TO ADJUST THE CARBURETOR How to adjust carburetor STIHL chainsaw MS 180

How to adjust the carburetor Stihl ms 180 what are the min and max speeds? Also a similar video about adjustment on my channel: https.

The STIHL MS 1800 chainsaw is idling. The chainsaw stalls and the speed cannot be adjusted

Repairing the idle speed of the STIHL MS 1800 chainsaw. The correct way to solve the problem if the chainsaw stalls and cannot be adjusted.

How much to adjust the carburetor of the Stihl 180 chainsaw?

We only have access to idle speed

. For what purpose is this necessary and how to understand when it is necessary to adjust the idle speed of a Shtil 180 chainsaw? This is necessary if the chain does not stop at idle, which leads to injuries and unstable operation of the saw in general.

Procedure for adjusting the stihl MS 180 carburetor:

The Annotation for MS 180 describes how to set idle speed on a chainsaw as standard:

We turn adjustment screw counterclockwise until it goes tight, then turn it back two turns clockwise. Voila! Set up...

How to adjust a chainsaw carburetor - Chainsaw maintenance. Part 11

In this video we will answer the question of how to configure or adjust a chainsaw carburetor with your own hands

In this video we will answer the question of how to configure or adjust a chainsaw carburetor with your own hands

The design of different carburetor models is almost the same, so when working with them you can use the standard scheme. All elements must be removed carefully and then laid out in the order given below so that you can successfully place the items in place after the completion of the repair work.

Stihl ms 181,ms 211 will not start. Carburetor repair, carburetor adjustment

High-quality chainsaw from STIHL with a modern 2-MIX engine.

Spare parts Repair of Stihl ms 361 chainsaw. Carburetor adjustment.

Because If you have gasoline left in the tank, then 80 percent of the time you need to clean the carburetor - this is the first thing. Secondly, the saw starts if fuel is supplied to the cylinder, there is a spark and compression. The lack of fuel supply can be seen by a dry spark plug (disassemble and clean the carburetor, change the fuel filter, clean the impulse channel).

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If the Shtil MC 180 saw does not start, you need to check the air filter, gasoline supply, and the functionality of the spark plug. Although it may be enough to open and then close the gas tank cap. Ventilate the combustion chamber. Remove and dry the candle.

Malfunctions of the Stihl 250 Chainsaw Does Not Gain Speed

The chainsaw stalls - we look for and solve difficulties

A chainsaw is a very necessary tool that is simply irreplaceable in the household. This is a relatively ordinary technical device, but its mechanisms tend to fail. The chainsaw may stall and not pick up

speed at the most crucial moment, preventing the planned work from being completed. We will talk about the causes of breakdowns and methods for eliminating defects here.

To understand the causes of chainsaw breakdowns, you need to understand what such a device is. It runs on a conventional two-stroke internal combustion engine, malfunctions of which in most cases are the reason why the chainsaw stalls. A gasoline engine can be finicky for a variety of reasons, but they all lead to the same consequences. The most common consequences of breakdowns are the following:

Working chainsaw

. the key to the quality of successful work

• the engine does not start;
• the engine is unstable and often stalls;
• The chainsaw stalls under load.

The cause of such malfunctions can be a variety of malfunctions. The most common of them are the following:

• clogged air or fuel filter;
• malfunction of the spark plug;
• carburetor problems due to strong vibration of the mechanism;
• problems with the gas line;
• poor quality fuel mixture;
• dirty muffler;
• problems in the cylindrical group.

Each of the possible problems should be analyzed in detail.

A chainsaw may well stall at idle if the filters installed in it become clogged. First of all, if problems arise in the operation of the tool, you need to check the fuel filter.

: To do this, disconnect the fuel line and look at how the fuel flows to the carburetor.
If fuel is supplied in normal doses, then everything is fine with the filter and the problem needs to be looked for elsewhere
. If gasoline is supplied in insufficient quantities or is not supplied, the filter will have to be cleaned or changed.

To clean the fuel filter

, you must first drain the fuel from the tank and remove the filter element from it. You need to remove the filter through the filler hole of the tank with a hook, which can be made from ordinary wire. Disconnect the filter from the suction hose and carefully remove it. Sometimes a clogged filter can be cleaned, but in most cases it is much easier and more expedient to purchase a new filter element and then install it in the same way as the old one was removed.

Cleaning the fuel filter

Air filters become clogged with dirt and dust, just like fuel filters. Such problems often lead to malfunctions of the chainsaw - due to a clogged filter, air supply to the system is difficult, there is too much gasoline in the air-fuel mixture, which leads to malfunction of the device.

To clean the filter element, you need to carefully remove it from the chainsaw so that the dust on it does not get into the carburetor. If it has no visible damage, it is simply thoroughly cleaned of dirt, then washed using available detergents, dried and returned to its place.

READ Why The Chainsaw Doesn't Gain Speed

To ensure high-quality and long-term operation of the tool, professionals recommend changing filters at least once every 3 months.

The spark plug is the most important component of the ignition system; it is recommended to change it annually, but owners often forget about this simple rule. As a result, noticeable problems appear during idling. There are several malfunctions specific to the ignition system, the most common of which are the following:

1. 1. At the moment of starting, the spark plug is filled with gasoline. It is necessary to remove the spark plug from the hole, dry it without calcination and drain excess gasoline from the socket. After half an hour, you can put the spark plug back in place and try to start the mechanism again.
2. 2. Poor contact between the spark plug tip and the wire. Due to poor contact, the spark disappears and the chainsaw cannot work normally. In this case, you need to check the connection and fix the problem if there is one.
3. 3. Problems in the electronic ignition unit, leading to a lack of spark. If checking the connection between the tip and the wire does not reveal the problem, but there is no spark, the cause may be the ignition unit. It is impossible to repair the unit; if it is broken, it must be replaced with a new one.
4. 4. Incorrect gap between spark plug electrodes. For different spark plugs, the distance between the electrodes is within 0.2-0.5 mm. The gap is set using a feeler gauge of suitable thickness.

The STIHL MS 180 chainsaw does not pick up speed. Let's solve this problem.

One of the reasons why a chainsaw does not gain momentum

.

Chainsaw Stihl MS 180 problems with speed

Chainsaw Stihl

MS 180 has some nuances that make owners nervous and is expensive.

If the faulty spark plug is not damaged, then the defect lies elsewhere . A completely dry spark plug indicates that the problem is due to a lack of fuel supply. In such a situation, you will have to carefully check the entire fuel supply system in the chainsaw to find a defect.

The presence of black carbon deposits on the spark plug indicates poor carburetor adjustment, oil getting into the fuel, or fuel oversaturation with air. In this case, you should remove and clean the spark plug, completely change the fuel and readjust the carburetor.

If the inspection did not reveal problems with the filtration elements and the spark plug, it is possible that the device does not gain speed due to substandard carburetor operation. This unit in the mechanism is responsible for supplying the engine with the required amount of air- fuel mixture

, and if it is not adjusted correctly, the chainsaw will not be able to work normally. There are three special screws on the carburetor that allow you to adjust its operation:

• maximum speed screw;
• minimal;
• single.

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Some manufacturers are afraid of incompetent and inexperienced users interfering with the device, so they place only one screw on the carburetor - responsible for idle speed. Regardless of the number of screws, the device may only be adjusted in full accordance with the manufacturer’s instructions. If, after adjusting to factory standards, the carburetor continues to act up, it is recommended to clean the air and fuel channels of the device, the filter mesh and jets. If defects are found on these elements, it is recommended to replace them with new ones.

When maintaining and repairing a chainsaw, you must remember that the carburetor is a complex unit consisting of many parts that are easily damaged. To prevent this from happening, disassemble the carburetor slowly and carefully.

The device may not develop the required speed for operation due to a violation of the integrity of the fuel line or an inappropriate ratio of elements in the fuel mixture, which consists of oil and fuel. Before starting the mechanism, it is very important to visually check the integrity of its elements and external components in order to promptly detect any possible defects on the body, leaks of working fluids and other evidence of malfunctions. If there is physical damage to various elements of the saw, air leaks may occur, due to which the device will not be able to operate normally. Particular attention must be paid to the fuel line - the rubber pipe through which the working mixture moves.

When leaving the device in a damp place for a long time, it should be taken into account that if the temperature changes, the fuel line may simply crack, through it it will no longer be possible to supply fuel to the working components of the chainsaw and it will have to be replaced with a new one. It is impossible to repair the fuel line if it is physically damaged.

To avoid problems with the operation of mechanisms, you should properly prepare the fuel mixture - add high-quality ingredients to it in exactly the ratios specified in the original instructions for your device. fuel mixture ratio

leads to the fact that the engine parts will not be sufficiently lubricated, which is why the device can not only stall, but can also fail, stop starting and require complex and expensive repairs.

If, when using the device, there is a noticeable drop in engine power in idle mode and the car often stalls, you should definitely check its muffler. There are often cases when the muffler becomes heavily clogged with resinous particles and various combustion products of the spark extinguisher, which settle on the walls of the device in the form of heavy deposits. A layer of such deposits can interfere with the normal exhaust of exhaust gas, and therefore it should be removed periodically. To clean the muffler, it must be removed from the engine and disassembled, if it can be disassembled at all. The remaining holes from the muffler should be plugged.

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The assembly and all its components are thoroughly wiped with a rag moistened with water and detergent. The dismountable muffler is easy to dry after cleaning - just leave it disassembled for several hours. To thoroughly dry a non-removable muffler, it is better to use a household hair dryer. It is strongly recommended not to clean the muffler with dry rags and without using personal protective equipment. Particles of toxic substances can enter the respiratory tract and cause significant harm to human health.

To reduce the likelihood of muffler contamination and eliminate the need for frequent cleaning, use only high-quality oil to create the fuel mixture

. It is best to use ingredients recommended by the chainsaw manufacturer, even if they are expensive.

The problems described above are the most common, but their absence may indicate that the problem is hidden elsewhere

. If, when you press the gas, the saw does not start, you need to check the central element of the engine - the cylindrical group, because of this, machines often work poorly.

to determine the malfunction of the engine cylinder-piston group even simply visually. The presence of visible defects such as chips, scuffs, and signs of severe wear are clear evidence that the chainsaw is

does not work precisely because of problems with the cylinder. Physical damage and wear are a reason to change the cylinder, since it cannot be repaired.

Excellent chainsaw performance for many years

If there are no visual problems with this element of the chainsaw, you need to carefully examine its piston rings. Damage to the rings often leads to loss of engine power and unstable operation. If the rings move too freely in the cylinder grooves, it is time to change the spare parts.

A complete picture of the condition of the cylinder-piston group can only be obtained after disassembling the entire engine of the device. This is a very labor-intensive and complex task that requires professional knowledge and experience from the performer. It is not recommended to carry out such work on your own; it is better to entrust the analysis to professionals, or ask for help from a friend who understands the structure of chainsaws.

Source

How to adjust a chainsaw carburetor - Chainsaw maintenance. Part 11

How can I start this Shtil MS 250 chainsaw (without primer) correctly when it’s cold? I bought it a long time ago and rarely use it. Last year I decided to use it. As before, with the shutter closed, I pulled the cord 3-5 times - no “contractions” (after which the shutter opens and a normal start occurs). I thought I overfilled it and filled the candle.

I screwed it in, wiped it, burned it, and “ventilated” the cylinder. It doesn't catch on again. I repeated the procedure again, then put in a new spark plug - the same effect, it won’t start. I went to the service center - they twisted something, started it up and said: on saws without a primer, during a cold start, you don’t have to wait for it to set, just pull it two or three times, and then open the damper and let it go. Is it so?

The unit, of course, is sensitive to flooding, but there should be a flash. If the saw is working properly and the carburetor is adjusted as needed. The startup procedure is the same for all saws. Only one thing is not clear: if you ventilated the cylinder and installed another spark plug, then it should have started from the middle position (if there was overshoot).

True, there was only one case in my practice when the tool was started cold without any suction at all, then hot too with half a turn, idling, acceleration, traction - everything was normal. But it was one such 250th out of several dozen. To be on the safe side, you can try first, as they said: don’t wait for it to set, and if it doesn’t start (most likely), then it will be done right then.

First of all, I cleaned the filter, and there wasn’t much dust there and the chain was sharpened, but it didn’t want to cut. The tip of the tire cuts relatively normally, but when the tire is full, the speed drops. What to do?

Be sure to resharpen! This is just an indicator that the left and right sides are sharpened differently (well, or one is dumber than the other). I think all problems will go away. If the chain is sharpened correctly (or a new one, if any) and nothing changes, then the carburetor requires adjustment.

I have had a Stihl MS 250 chainsaw for three years now. This spring, after I did not drain the gasoline from the tank for the winter, problems began. After a week of inactivity, the saw starts up well. But during operation the average speed disappears. You have to constantly re-gas it well. But the most interesting thing is that the next day the problem disappears.

Fuel failure. If the spark is normal, then check the fuel system. Preferably everything from the intake to the carburetor. There may be mucus in the suction, try replacing it. But especially carefully clean the carburetor and check for damage. Well, if the next day it works well, then there is no air leak, I think not. And also check the quality and proportion of the mixture.

The saw does not start - the mixture flows through the muffler. I turned off the accelerator and it worked like clockwork. After which I left it for 3 hours and came and this is it. There seems to be a spark, but it won’t start. Maybe someone had this?

The mixture is not being prepared correctly, most likely there is an air leak. Remember what else you twisted or unscrewed. The connections may not be tight.

I replaced the crankcase on a Stihl MS 250 chainsaw. After assembly, gasoline flowed in a stream from the connection between the tank and the rubber tube. The crankcase is original, the tube is old, inserted correctly. Is it an old tube that has shrunk and needs to be replaced or does the connection between the tube and the tank need to be sealed with some kind of sealant?

The suction hose needs to be replaced. It is tightly inserted into the body, at most it is slightly lubricated with oil at the time of installation.

Is it possible to install a 0.325″ saw set on a Shtil 250 chainsaw? If so, what are the tire and sprocket part numbers?

The MS 250 can be equipped with a 0.325 saw set. 1) art. 30050005009 — Tire 14″ (35cm) 0.325″ 1.5 56 stars. Stihl 025. 2) art. 30050004713 — Tire 16″ (40cm) 0.325″ 1.6 62 stars. 025. 3) art. 30050084717 — Tire 18″ (45cm) 0.325″ 1.6 68 stars. Chains accordingly: 1) art. 11230071032 — Chain set. wheels 325″ 7z. 2) art. 11230071031 — Chain set. wheels 325″ 8z. 3) art. 11236402074 - Prof. flail wheel 325″ 7z.

How to replace clutch springs and clutch weight holders without disassembling the entire saw?

You need to remove the clutch, otherwise there is no other way.

The chain stopped smearing on the 250 Stihl, I think I cleaned everything, filled it with warm oil, started it indoors, it doesn’t work, I broke the chain on the roller, any thoughts?

Regarding lubrication of the 250 - did you pull out the pump? There, they typically experience such clogging of the oil system periodically, especially if the saw is used in construction work. You try these steps: Pull out the plugs from the shock absorbers, unscrew the 3 screws under them and another one on the right on the handle.

Disconnect the handle-frame, move it slightly to the side so that you can get to the oil pump connector. Unscrew the connector screw and remove it. The saw lies with its plugs down. If oil does not flow from the oil hose, pull it out from the bottom of the saw along with the intake and clean the hose. Insert into place, oil should flow.

screw in the oil pump with a long M5 screw. Using pliers, pull the pump out of the socket; use the pliers as a lever, leaning on the body or frame, whichever is more convenient. Look - most likely, small sawdust has been compressed in the longitudinal groove on the pump body, remove it. Check that the pump rotates without jamming, put it in place using the same long screw and tapping it with something.

There is a Stihl MS 250 saw on the farm. The oil to lubricate the chain has stopped flowing, the chain and bar have overheated - do both need to be replaced?

Everything is fine with your tire, it’s not overheating, but zone hardening. What to check: The drive worm itself - you need to remove the clutch. We check visually for any damage. If the worm is damaged, check to see if the pump is jammed. If everything is fine here too, check the suction side.

Currently reading: Gasoline Trimmer Gasoline Consumption • AURAMM.RU

For this saw, which chain is preferable? 3/8 or 3/8P? Somewhere they write that they are interchangeable, is this really true (the tire is marked 3/8P*)?

Of course, 3/8P. 3/8 is for large, powerful professional saws; the 250 won’t handle it.

I want to install a longer tire (40cm). In the store, the manager advised changing the chain pitch from 3/8p to 0.325, citing greater productivity. How rational is this? Which one is better to take a sprocket, shank, chain?

A long time ago, when this instrument was sometimes imported from Scandinavia, a 325″ headset was standard there. But, as far as I remember, only 14-inch, i.e. The length is the same as the 3/8 standard. There were tires like this not very long ago, and they probably still exist today. I only remember the length of the chain - 56 links. The engine will pull quietly, you won’t even notice.

The performance is indeed slightly higher than 3/8″. Replacing the headset will cost quite a lot. We count: A tire, a pair of chains, a 325″ sprocket set (I don’t remember the part number) or a profile sprocket (a little cheaper). But you can install a longer 3/8″ tire. Available for 16″ Article number 3005 000 4813. Just don’t get confused - the article number should start with 3005. This is a small shank.

Need to do a little research. Acceleration of the device is initiated. It is necessary to evaluate the proper operation of the engine during maximum speed. When the engine is functioning correctly, it means that when you press the accelerator, the speed quickly increases to 15,000 rpm.

If this does not happen or the increase in speed is too slow, you must use the screw marked L. It turns counterclockwise. Moderate movements must be observed, since the turn cannot be more than 1/8 of a full circle.

Before this procedure, it is necessary to carry out a full adjustment of the carburetor components when operating at maximum speed. Next, you should check the functioning of the device in idle cold mode. When the correct adjustment parameters are achieved, you will notice that the carburetor design closely matches the following criteria:

1. When the idle cold mode is activated, the chain does not move.

Chainsaw accelerator

1. When the accelerator is pressed even slightly, the engine accelerates at an accelerated pace. With gradual deepening of pressure, you can notice that the engine speed increases proportionately, reaching the maximum permissible values.
2. When the engine is running, you can compare its sound to a four-stroke device.

If violations are noticed in the given parameters or the device has not been fully adjusted, you need to perform the main setup step again. Sometimes actions are performed incorrectly. In this case, the device may fail due to the loss of the correct node settings. In this case, you will have to contact a specialist.

Adjusting the Carburetor of the Stihl 250 Chainsaw with Your Own Hands

Trimmers and chainsaws

Adjusting the carburetor of a chainsaw using the example of STIHL MS 250

The need for the operation “Adjusting the chainsaw carburetor” is determined by the color of the spark plug electrodes: if they are black, it means over-enrichment, if they are brick-gray, then it is normal, if there is a white coating on the electrodes of the spark plug, it means the mixture is lean.

The main role in adjusting the carburetor of the Stihl chainsaw is played by the upper screw (closest to the muffler).

According to the factory parameters (indicated on the cover of the chainsaw), it should be unscrewed 1 turn, and then it needs to be adjusted - if you unscrew it, the working mixture becomes richer (more gasoline gets into the air-fuel mixture), if this screw is screwed in, the working mixture becomes leaner (less gasoline gets into the air-fuel mixture).

Do-it-yourself chainsaw carburetor adjustment

For an independent carburetor option, you need to familiarize yourself with its structure and understand the procedure for the work that is carried out to adjust the parts responsible for the proper functioning of the components of the device and parts close to it.

It is necessary to carefully handle items for the system option, and also to determine whether the set characteristics correspond to very acceptable values.

The design of different carburetor models is almost the same, so when working with them you can use the standard scheme. Adjusting the carburetor of the Champion 254 chainsaw with your own hands. Setting up stihl saws. All elements must be removed carefully and then laid out in the order given below so that you can successfully place the items in place after the completion of the repair work.

Removing the Top Cover

1. The top cover is removed. To do this, you need to unscrew the 3 bolts holding it in a circle.
2. The foam rubber is also removed, since it is the upper component of the filter that conducts air.
3. The fuel hose is removed.
4. The drive thrust is output directly to it.
5. The cable end is disconnected.
6. The gasoline hose can be completely removed if you systematically pull it off the fitting.

To finally prepare the carburetor for major repairs or replacement of the smallest parts, you need to carefully disconnect it from the main system. Sometimes further disassembly is required. You should unscrew the components carefully and put the fasteners in groups, as these small parts are easily lost.

Using the idle stop “LA” bolt, ensure that the chain begins to move, and then turn this bolt ¼ turn counterclockwise.4. If, after this adjustment of the chainsaw carburetor, the idle speed is not stable, and the chainsaw accelerates poorly, then you need to turn the “L” screw slightly counterclockwise until the chainsaw quickly picks up speed and works well at idle speed. Then adjust the “LA” bolt (idle speed according to the tachometer should be 2800 rpm). Attach.

Note: It will not be possible to adjust the chainsaw carburetor if there is air leakage into the engine from the side (through the gasket under the carburetor, through the carburetor accelerator pump, through the chainsaw crankshaft seals or somewhere else).

1. Standard idle speed adjustment (abbreviated x.x.): turn the screw counterclockwise until it goes tight, then make two turns clockwise, and that’s it.2. If the idle speed is too low. then you need to turn the screw clockwise until the chain begins to move, and then turn the screw 0.5 turns counterclockwise.3.

That's it, the adjustment of the carburetor of the Shtil 180 chainsaw is completed.

How can I start this Shtil MS 250 chainsaw (without primer) correctly when it’s cold? I bought it a long time ago and rarely use it. Last year I decided to use it. As before, with the shutter closed, I pulled the cord 3-5 times - no “contractions” (after which the shutter opens and a normal start occurs). I thought I overfilled it and filled the candle.

I screwed it in, wiped it, burned it, and “ventilated” the cylinder. It doesn't catch on again. I repeated the procedure again, then put in a new spark plug - the same effect, it won’t start. I went to the service center - they twisted something, started it up and said: on saws without a primer, during a cold start, you don’t have to wait for it to set, just pull it two or three times, and then open the damper and let it go. Is it so?

The unit, of course, is sensitive to flooding, but there should be a flash. If the saw is working properly and the carburetor is adjusted as needed. The startup procedure is the same for all saws. Only one thing is not clear: if you ventilated the cylinder and installed another spark plug, then it should have started from the middle position (if there was overshoot).

True, there was only one case in my practice when the tool was started cold without any suction at all, then hot too with half a turn, idling, acceleration, traction - everything was normal. But it was one such 250th out of several dozen. To be on the safe side, you can try first, as they said: don’t wait for it to set, and if it doesn’t start (most likely), then it will be done right then.

First of all, I cleaned the filter, and there wasn’t much dust there and the chain was sharpened, but it didn’t want to cut. The tip of the tire cuts relatively normally, but when the tire is full, the speed drops. What to do?

Be sure to resharpen! This is just an indicator that the left and right sides are sharpened differently (well, or one is dumber than the other). I think all problems will go away. If the chain is sharpened correctly (or a new one, if any) and nothing changes, then the carburetor requires adjustment.

I have had a Stihl MS 250 chainsaw for three years now. This spring, after I did not drain the gasoline from the tank for the winter, problems began. After a week of inactivity, the saw starts up well. But during operation the average speed disappears. You have to constantly re-gas it well. But the most interesting thing is that the next day the problem disappears.

Fuel failure. If the spark is normal, then check the fuel system. Preferably everything from the intake to the carburetor. There may be mucus in the suction, try replacing it. But especially carefully clean the carburetor and check for damage. Well, if the next day it works well, then there is no air leak, I think not. And also check the quality and proportion of the mixture.

The saw does not start - the mixture flows through the muffler. I turned off the accelerator and it worked like clockwork. After which I left it for 3 hours and came and this is it. There seems to be a spark, but it won’t start. Maybe someone had this?

Currently reading: DIY device for sawing logs with a chainsaw

The mixture is not being prepared correctly, most likely there is an air leak. Remember what else you twisted or unscrewed. The connections may not be tight.

I replaced the crankcase on a Stihl MS 250 chainsaw. After assembly, gasoline flowed in a stream from the connection between the tank and the rubber tube. The crankcase is original, the tube is old, inserted correctly. Is it an old tube that has shrunk and needs to be replaced or does the connection between the tube and the tank need to be sealed with some kind of sealant?

The suction hose needs to be replaced. It is tightly inserted into the body, at most it is slightly lubricated with oil at the time of installation.

Is it possible to install a 0.325″ saw set on a Shtil 250 chainsaw? If so, what are the tire and sprocket part numbers?

The MS 250 can be equipped with a 0.325 saw set. 1) art. 30050005009 — Tire 14″ (35cm) 0.325″ 1.5 56 stars. Stihl 025. 2) art. 30050004713 — Tire 16″ (40cm) 0.325″ 1.6 62 stars. 025. 3) art. 30050084717 — Tire 18″ (45cm) 0.325″ 1.6 68 stars. Chains accordingly: 1) art. 11230071032 — Chain set. wheels 325″ 7z. 2) art. 11230071031 — Chain set. wheels 325″ 8z. 3) art. 11236402074 - Prof. flail wheel 325″ 7z.

How to replace clutch springs and clutch weight holders without disassembling the entire saw?

You need to remove the clutch, otherwise there is no other way.

The chain stopped smearing on the 250 Stihl, I think I cleaned everything, filled it with warm oil, started it indoors, it doesn’t work, I broke the chain on the roller, any thoughts?

Regarding lubrication of the 250 - did you pull out the pump? There, they typically experience such clogging of the oil system periodically, especially if the saw is used in construction work. You try these steps: Pull out the plugs from the shock absorbers, unscrew the 3 screws under them and another one on the right on the handle.

Disconnect the handle-frame, move it slightly to the side so that you can get to the oil pump connector. Unscrew the connector screw and remove it. The saw lies with its plugs down. If oil does not flow from the oil hose, pull it out from the bottom of the saw along with the intake and clean the hose. Insert into place, oil should flow.

screw in the oil pump with a long M5 screw. Using pliers, pull the pump out of the socket; use the pliers as a lever, leaning on the body or frame, whichever is more convenient. Look - most likely, small sawdust has been compressed in the longitudinal groove on the pump body, remove it. Check that the pump rotates without jamming, put it in place using the same long screw and tapping it with something.

There is a Stihl MS 250 saw on the farm. The oil to lubricate the chain has stopped flowing, the chain and bar have overheated - do both need to be replaced?

Everything is fine with your tire, it’s not overheating, but zone hardening. What to check: The drive worm itself - you need to remove the clutch. We check visually for any damage. If the worm is damaged, check to see if the pump is jammed. If everything is fine here too, check the suction side.

Maximum number of revolutions

Before adjusting the carburetor of the Stihl chainsaw, you need to carry out technical service of the chainsaw (clean the carburetor of the chainsaw, rinse the chainsaw engine, change the spark plug, clean the air filter, check the chain tension, adjust the idle speed, warm up the engine).

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1. Screw screws “H” and “L” (on a muffled chainsaw) until they stop, and then unscrew both by 1 turn. 2. Start the chainsaw and warm it up. Give full throttle and use screw “H” to reach the highest engine speed of 14,000 rpm. by tachometer (by engine revolution counter). Keep the highest speed for adjustment for no more than 10 seconds! 3.

Using the “LA” bolt of the idle stop, ensure that the chain begins to move, and then turn this bolt ¼ turn counterclockwise. 4. If, after this adjustment of the chainsaw carburetor, the idle speed is not stable, and the chainsaw accelerates poorly, then you need to turn the “L” screw a little counterclockwise until the chainsaw begins to rapidly pick up speed and work perfectly at idle speed. After this, adjust the “LA” bolt (idle speed according to the tachometer should be 2800 rpm).

Note: It will not be possible to adjust the carburetor of a chainsaw if there is air leakage into the engine from the side (through the gasket under the carburetor, through the accelerator pump of the carburetor, through the crankshaft seals of the chainsaw or somewhere else).

HOW TO CORRECTLY ADJUST THE CARBURETOR ON YOUR CHAINSAW //Stihl

In this video we will answer the question of how to configure or adjust a chainsaw carburetor with your own hands

To limit this indicator, you need to use a screw marked H. To increase the number of revolutions, turn it clockwise, and to reduce them in the opposite direction. The maximum frequency should not exceed 15000 rpm.

If you make this figure larger, the device’s engine will wear out, which will lead to problems in the ignition system. When rotating this screw, you need to take into account the ignition processes of the device. If the slightest malfunctions appear, then the maximum speed value must be reduced.

1. Screw screws “H” and “L” (on a muffled chainsaw) until they stop, and then turn both out 1 turn.2. Start the chainsaw and warm it up. Give full throttle and turn screw “H” until the maximum engine speed is 14,000 rpm. by tachometer (by engine revolution counter). Keep the maximum speed for adjustment for no more than 10 seconds!3.

Using the idle stop “LA” bolt, ensure that the chain begins to move, and then turn this bolt ¼ turn counterclockwise.4. If, after this adjustment of the chainsaw carburetor, the idle speed is not stable, and the chainsaw accelerates poorly, then you need to turn the “L” screw slightly counterclockwise until the chainsaw quickly picks up speed and works well at idle speed. Then adjust the “LA” bolt (idle speed according to the tachometer should be 2800 rpm).

Note: It will not be possible to adjust the chainsaw carburetor if there is air leakage into the engine from the side (through the gasket under the carburetor, through the carburetor accelerator pump, through the chainsaw crankshaft seals or somewhere else).

Before adjusting the carburetor of the Stihl chainsaw, it is necessary to carry out maintenance of the chainsaw (clean the carburetor of the chainsaw, wash the chainsaw engine, replace the spark plug, clean the air filter, check the chain tension, adjust the idle speed, warm up the engine).

1. Screw screws “H” and “L” (on a muffled chainsaw) until they stop, and then turn both out 1 turn.2. Start the chainsaw and warm it up. Give full throttle and turn screw “H” until the maximum engine speed is 14,000 rpm. by tachometer (by engine revolution counter). Keep the maximum speed for adjustment for no more than 10 seconds!3.

Stihl ms 250 repair (Part 1)

Need to do a little research. Acceleration of the device is initiated. It is necessary to evaluate the proper operation of the engine during maximum speed. When the engine is functioning correctly, it means that when you press the accelerator, the speed quickly increases to 15,000 rpm.

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

Read:

1. When the idle cold mode is activated, the chain does not move.

Chainsaw accelerator

1. When the accelerator is pressed even slightly, the engine accelerates at an accelerated pace. With gradual deepening of pressure, you can notice that the engine speed increases proportionately, reaching the maximum permissible values.
2. When the engine is running, you can compare its sound to a four-stroke device.

If violations are noticed in the given parameters or the device has not been fully adjusted, you need to perform the main setup step again. Adjusting the carburetor of the Champion 254 chainsaw with your own hands. Initial carburetor adjustment shown. Sometimes actions are performed incorrectly. In this case, the device may fail due to the loss of the correct node settings. In this case, you will have to contact a specialist.

Of course, 3/8P. 3/8 is for large, powerful professional saws; the 250 won’t handle it.

I want to install a longer tire (40cm). In the store, the manager advised changing the chain pitch from 3/8p to 0.325, citing greater productivity. How rational is this? Which one is better to take a sprocket, shank, chain?

Currently reading: How to sharpen a chain

A long time ago, when this instrument was sometimes imported from Scandinavia, a 325″ headset was standard there. But, as far as I remember, only 14-inch, i.e. The length is the same as the 3/8 standard. There were tires like this not very long ago, and they probably still exist today. I only remember the length of the chain - 56 links. The engine will pull quietly, you won’t even notice.

The performance is indeed slightly higher than 3/8″. Replacing the headset will cost quite a lot. We count: A tire, a pair of chains, a 325″ sprocket set (I don’t remember the part number) or a profile sprocket (a little cheaper). But you can install a longer 3/8″ tire. Available for 16″ Article number 3005 000 4813. Just don’t get confused - the article number should start with 3005. This is a small shank.