Stihl 211 Chainsaw Carburetor Adjustment

Adjusting the Stihl 180 carburetor

The carburetor of the Stihl 180 chainsaw, indiscriminately, can only be adjusted for the number of idle revolutions. It is impossible to increase or decrease the fuel supply in different modes with the help of Special screws. The manufacturer restricts access to the adjustment and does NOT install these screws. How to adjust the carburetor to the correct idle speed is described in great detail in the manufacturer’s instructions.

In the event of certain malfunctions, and with experience, you can increase or decrease the fuel supply by increasing the clearance when opening the needle valve.

To increase the flow, the rocker arm of the needle valve in the distribution chamber must be bent up, and to decrease, down. This regulates the stroke of the needle and accordingly the throughput of the valve.

Fuel pump

A fuel pump is installed directly in the carburetor body, which works under the action of an air pulse from the crankcase of the chainsaw, which is transmitted through special channels. A diaphragm is installed in the pump, it is she who is responsible for pumping fuel under the action of an impulse. A gasket is installed between the diaphragm and the body, which is responsible for the tightness of the fuel pump.

Why does the Stihl 180 carburetor overflow and a few typical faults

After we examined the carburetor device, it will NOT be difficult to determine the reason why fuel enters the combustion chamber in a larger volume. This is due to the wear of the gasket between the compensator cover and the carburetor body. You ask how this might affect?

The answer is simple, by shrinking, the gasket releases the diaphragm located on the floor by a fraction of a millimeter down. She, in turn, push harder on the rocker arm of the needle valve, it will open more position and the fuel will flow in excess (it will start overflow).

Another reason is the stretching of the diaphragm itself, this occurs as a result of natural wear and tear. It is impossible to prevent this process, but you can solve the problem by periodically changing all gaskets, carburetor diaphragms, and fuel pump. There is a repair kit for this.

Dismantling the carburetor Stihl 180

In order to purge, change the gaskets or the needle valve, the carburetor must be disassembled. To do this, unscrew 4 screws on the expansion joint cover and one on the fuel pump.

Having opened the case, you should be extremely careful, because if debris gets inside the carburetor, it will make its work impossible. The thickness of the channels in it is comparable to the thickness of a thread or even a human hair.

Repair of the Stihl 180 carburetor, can be seen below. In it, the master tells in detail about the problems and clearly demonstrates the entire repair process.

Stihl 180 carburetor device

So, the stihl ms 180 carburetor is developed and manufactured by a subsidiary of Stihl called Zama. Original Carburetors, on their body have a company logo that guarantees product quality.

Air damper

The carburetor choke is installed on the opposite side of the throttle and is responsible for starting a cold engine, it is controlled by the engine control lever. Air damper is fully closed for cold start and open for normal operation.

Throttle valve

The throttle valve, installed in the carburetor body, is responsible for increasing the supply of the fuel mixture directly to the engine cylinder. At the moment of pressing the gas, the throttle valve opens slightly, thereby increasing the throughput of the channel and fuel from the carburetor cavity, rushes into the cylinder in a larger volume.

Combustion of a larger volume of fuel increases the amount of generated energy, which affects the power and speed of the processes. The damper is installed on the shaft passing through the entire carburetor body. At the exit of the shaft from the housing, a mount for the gas cable is installed, next to it is a cone-shaped adjusting screw responsible for adjusting the idle speed. By tightening the screw, you can slightly adjust the position of the shaft and the damper installed on it, thereby increasing or decreasing the idle speed, slightly opening or vice versa closing the damper.

Distribution chamber

In the distribution chamber, as in the fuel pump, there is also a membrane that opens and regulates the fuel supply by pressing a special rocker, while raising its needle valve.

The cover of the chamber is the compensator body, which is attached to the carburetor with four screws, a gasket is installed between the body and the cover, which increases the height of the chamber and is responsible for sealing.

Removal and installation algorithm

In cases where it is necessary to clean the Stihl 180 carburetor or disassemble it, first you need to remove the assembly from the chainsaw. This must be done in compliance with a certain algorithm of actions:

• Put the protective cover for the chainsaw on the tire.
• Remove the top cover of the chainsaw.
• Remove the two nuts securing the air filter and carburetor.
• Remove the air filter housing.
• Disconnect the wire from the engine control lever.
• Carefully remove the lever from its seat in the housing, at the same time disconnecting the air damper rod from it.
• Pull the carburetor towards you and disconnect the fuel supply as well as the throttle rod.

To facilitate dismantling, you can additionally untwist the rear handle and disconnect the throttle rod first from it, and then only from the carburetor. This may be required, because without some experience, disconnecting the rod from the carburetor is quite problematic and it is easier to first disassemble the handle.

To install the part in place, follow the reverse order of the algorithm.

How to properly adjust the carburetor with your own hands?

After rinsing and completely cleaning the carburetor, assemble it and begin to adjust. First of all, you should understand the purpose of the adjusting screws. The instruction will help with this, but some general points should be considered right away. The most common designations for screws are:

• H. adjusts the state of the main jet, i.E. Adjusts the maximum speed of rotation of the motor shaft;
• L. adjusts the idle jets (responsible for the minimum shaft rotation speed)
• T. regulates the engine idling. It can also be designated LA or S, on some carburetor models it is not at all.

Turning screws H and L clockwise depletes the air-fuel mixture, and counterclockwise enriches it (the amount of gasoline increases). When the screw T rotates, the idling speed of the shaft changes. it increases clockwise, and decreases in the opposite direction.

Figure 2. Carburetor adjustment mechanisms

Before proceeding with direct actions, you should find and carefully study the information on the position of the adjusting screws (the magnitude of the angles of rotation during adjustment). This information is available in the instructions for the chainsaw. Then you need to prepare the workplace. lay the dust on a flat horizontal plane, direct the chain in the opposite direction from you. Detach all covers, remove foam rubber and air filter. At this preparatory operations are considered completed, you can proceed to the main part of the work.

Carburetor adjustment procedure:

• Smoothly tighten the screws H and L clockwise until they stop. Be careful not to break the screws. this will lead to the complete loss of the carburetor.
• Unscrew both screws one and a half turn.
• Run the engine for 10 minutes and warm it up. This is a necessary moment, since it will NOT be possible to correctly adjust the carburetor on a cold engine.
• Turning screws H and L, alternately adjust the rotation of the shaft at maximum and minimum revolutions.
• Adjust the position of the screw T (or it may have another designation), the idle speed of the chainsaw is adjusted. It is necessary to achieve smooth and stable engine operation. Important Observe whether the chain is idling or not. If it moves, turn the screw a little more counterclockwise.

You can check the operation of the engine visually and by ear. A mixture that is too rich will cause thick smoke from the exhaust. When the lean mixture is being fed, a whistling sound is heard while the saw is running. Excessive economy mode is harmful. if the L screw is set to “lean” fuel, there will be problems with starting the engine. If the H screw is set to lean, the saw will noticeably lose power. You can determine the correct setting by the following criteria:

• At idle speed, the engine does NOT stall, and the chain is motionless;
• When the engine is running, there is excessive smoke from the exhaust pipe;
• The engine demonstrates good throttle response (quickly picks up speed when you press the accelerator).

A detailed description of the setting is available in the instructions that come with the instrument in the delivery set. It should be carefully studied as there may be some features or specific requirements set by the manufacturer and related only to this saw model. If all requirements are met exactly, the performance of the chainsaw will be restored to its original state.

Design and working principle

A carburetor is a device in which fuel (gasoline) and air are mixed in predetermined proportions, with the subsequent supply of the prepared mixture to the engine cylinder. Almost all models of chainsaws are equipped with Carburetors of the same type, so the device and principle of operation are the same.

The main structural elements of the carburetor are:

• Die-cast aluminum housing for light weight. Chainsaws constantly have to be moved from place to place, during operation they are held by hands, therefore, reducing the weight of the tool is the primary task of manufacturers;
• A diffuser with an air damper, which are located at the inlet;
• Jets, which are valves for metering fuel;
• A sprayer that injects gasoline into the chamber (in the diagrams it is designated as the main jet)
• Fuel (float) chamber.

Figure 1. Diagram of a chainsaw carburetor

The principle of the carburetor can be described as a cycle consisting of the following steps:

• Air damper opens during engine start.
• The piston stroke creates vacuum in the air channel, as a result of which air enters the diffuser, the amount of which is regulated by the position of the air damper.
• Gasoline flows from the gas tank to the float (fuel) chamber. The rate of its admission is regulated by jets.
• Gasoline and air are mixed in the diffuser, resulting in the formation of a fuel-air mixture, which then enters the engine cylinder. The more the mixture enters the combustion chamber of the cylinder, the higher the power and speed on the engine shaft will be.

How to properly adjust the carburetor on a chainsaw with your own hands?

A chainsaw is a useful, and sometimes simply necessary tool for the owner of a private house. It has a high degree of autonomy, can be used in the field, where there is no possibility of connecting to the power supply network. For some craftsmen, the chainsaw is one of the main devices that perform large amounts of work almost daily. Such loads knock down the factory settings, which were installed for all fundamental engine components.

The operating mode most often changes in the carburetor, which has to be adjusted again. Without understanding the design and principle of operation of this element, it is impossible to properly adjust it. The question concerns many users who closely operate chainsaws, so it will be useful to consider it more carefully.

Adjustment tools

To tune the carburetor, you will need a Phillips or slotted screwdriver of different lengths or thicknesses, the size depending on the design of this unit and the features of the engine assembly. It should be noted that some manufacturers make Carburetors designed to use special tools.

In particular, special types of screwdrivers may be required to tune Husqvarna carburettors worthy of imported tools. It is advisable to clarify this question even when buying a chainsaw, so that you can purchase the necessary additional equipment in advance.

In addition, you will need refined gasoline or acetone to flush and clean the device. They are used to clean the outer surfaces of the carburetor. All internal channels are washed with kerosene, diesel fuel or white spirit. Before flushing, the carburetor is disassembled, all rubber or plastic parts that may suffer from contact with aggressive chemical compounds are removed.

Open-end or spanner wrenches are used to disassemble the carburetor. Internal canals are washed in specially designated trays, sometimes plastic syringes are used for this.

When is carburetor adjustment necessary?

Initially, from the moment the instrument was sold, all Carburettors were adjusted and tuned at the factory. However, in the process of operation, the settings gradually go astray, and the operating mode changes in accordance with the operating conditions. Signs of a carburetor malfunction may include:

• Too high gasoline consumption, thick smoke comes from the exhaust pipe;
• Engine power is clearly not enough to perform normal tasks;
• Engine speed “float”;
• After starting, the engine stalls either immediately or after a few seconds
• The engine cannot be started at all;
• The chainsaw “shoots”, there are sharp claps in the tool engine.

It should be noted that during the running-in of a new engine, the carburetor is set to a reduced fuel supply in order to limit the engine power. After the end of the run-in, the fuel supply increases to the nominal value. These adjustments are made using the adjusting screws on the carburetor body (usually two or three).

How to customize China-made dust?

The design of the carburetor on Chinese chainsaws is not fundamentally different. The order and principle of adjustment also do not differ and are performed in the same order. The only difficulty that may arise during work is determining the purpose of the adjusting screws. Typically the T screw is at the top and the H and L are at the bottom of the carburetor body. One additional screw may be present.

Figure 3. Location of adjusting devices

Usually their purpose is determined empirically, slightly changing the position and follow the result. After the purpose of the elements is clearly defined, further adjustment is not difficult and is carried out in the usual way.

Chainsaw carburetor tuning is an important and necessary procedure that must be periodically performed to restore the normal operation of the tool. This process does NOT create fundamental complexity, but requires the user to be careful, attentive and follow safety rules. The chainsaw chain will usually NOT be removed as you will need to observe its position. Therefore, it is important to constantly remember about the possibility of launching it and take the necessary caution.

The adjustment must be done smoothly, with small changes in the position of the screws, so as not to cause too sharp changes in the shaft rotation mode. The result depends on the care and thoroughness of the user, and a properly tuned carburetor will extend the life of the tool.

How does the carburetor of a chainsaw work, on what principle does it work

Modern car engines are no longer equipped with a carburetor. Meanwhile, before, almost every driver knew how to adjust it. Today, chainsaws with injection engines have already begun to appear on sale, but the carburetor models will hold the palm for a long time, because their cost is 5-15 times lower than in the modernized version.

The carburetor consists of several main parts:

• Aluminum body;
• Diffuser and air damper at the inlet;
• Nozzles (valves for adjusting the fuel supply);
• Atomizer (it is he who provides injection)
• Fuel (float) chamber.

The principle of operation of a chainsaw carburetor is quite simple. Fuel is supplied continuously, and its quantity is regulated by a jet. Air enters through the air damper due to the air vacuum generated by the piston. The diffuser mixes fuel and air. It is this fuel-air mixture that enters the cylinder, forcing the engine to work.

Mechanic at home: adjusting the carburetor of a chainsaw with your own hands

Any internal combustion engine requires periodic maintenance, It doesn’t matter if it is the engine of a simple moped or a powerful multi-ton tractor. Such a tool as a chainsaw was no exception. After all, it is equipped with a single-cylinder two-stroke internal combustion engine, which also requires serious maintenance, although it is much easier to perform the necessary actions here. In today’s article we will talk about how to adjust the carburetor of a chainsaw with our own hands, find out how difficult it is, and figure out whether you need to be a professional mechanic to do this kind of work.

How to adjust the carburetor on chainsaws

To understand how to properly adjust the carburetor on a chainsaw, you need to see it, and then suggest it to the reader Pay attention to the example below.

To make the adjustment, you only need a slotted screwdriver, however, it will NOT be possible to fine-tune the carburetor without a tachometer (of course, if the person is NOT a minder or a professional driver with experience). Now let’s try to understand how to adjust the carburetor in a given situation.

How to set up a chainsaw carburetor if it won’t start at all

Quite a common problem in cases when a “master” from the “I know everything” series tries to get into the settings with his hands, growing NOT from the shoulders. In such cases, there are standard screw positions from which you can “dance” further. First, you need to completely tighten both screws (do not overdo it). Then Unscrew:

• Screw L. one revolution;
• Screw H. one and a half turn.

With regard to the idle screw, the throttle must first be completely closed (screw T removed). After that, it must be turned one and a half turns clockwise and try to start the engine. If it did not work out, it is gradually added by a quarter of a turn before starting. When the engine starts to work, the position of the idle screw is adjusted so that the GIS is not GLH, but the chain is still in place.

Machine for sharpening chainsaw chains: selection criteria, design features, technical and operational characteristics of equipment, the principle of operation of manual and automatic devices, an overview of popular models of sharpening installations.

Determining the need to adjust the carburetor on a chainsaw

Before you start adjusting the carburetor on a chainsaw, you need to make sure that it is generally required. It would seem an absurd phrase. However, in 90% of cases, when an inexperienced craftsman considers such an action necessary, the unstable operation of the instrument is associated with other reasons, including:

• Problems in fuel lines and the filter. blockages, depressurization;
• Malfunction of the exhaust system;
• Clogged or damaged air filter;
• Unstable operation of the ignition system;
• Violation of the tightness of the engine crankcase.

Only if these problems are excluded, and the engine is unstable, it is safe to say that carburetor adjustment is required.

How to sharpen a chainsaw chain: tooth configuration and sharpening angle, templates and tools for sharpening, the frequency of the procedure; how to sharpen a chainsaw chain at home with a file, using an angle grinder, on a machine, additional recommendations.

How to correctly and accurately adjust the carburetor: Step by step instructions

In order to make the information easier to perceive, we propose to consider it on the basis of photo examples with a description of actions in tabular form. The basis is a chainsaw with Initial settings.

Read more You can get acquainted with the master class on adjusting the carburetor of a chainsaw in this.

“Poor mixture”

There is an excess of air in the “poor” mixture, which is not good because it has its drawbacks. Namely: insufficient energy during a flash (and therefore a loss of power in the end), excessive heating of the cylinder due to insufficient lubrication and high rpm, which leads to scuffing, and there it is not far to “jam” the engine.

Purpose, design and principle of operation of the carburetor.

The carburetor is needed to prepare the air-fuel mixture to power the engine. If the proportions in this mixture are not correct, the motor will malfunction. If the proportion is not observed in the direction of increasing the amount of fuel, the mixture is called oversaturated, if, on the contrary, there is little fuel, it is called lean. Both of them do NOT have the best effect on engine operation.

In different models of chainsaws, Carburetors differ in design, but they are similar in principle of operation. The air stream moves at high speed through the air channel. A damper blocking the channel allows you to change the speed of the air stream. The fuel is fed through the nozzle into the channel, where it mixes with the incoming air, forming a fuel-air mixture. The resulting mixture enters the engine.

The pressure in the float chamber, where the fuel is located before mixing, is practically equal to atmospheric pressure. But a vacuum is created in the air channel, due to which the fuel is drawn into the air stream. The more the damper is opened, the faster the air moves, and the amount of fuel also increases. the engine speed increases. So you can simplify the principle of the carburetor.

Chainsaw carburetor adjustment is required for efficient, smooth operation of the tool, getting maximum output and at the same time economical fuel consumption. Before adjusting, the fuel and air filters must be checked. they must be clean. On most chainsaws, adjustment is carried out with three screws: idle, high speed, low speed. In the correct setting of the carburetor, the following signs indicate:

• The chain does NOT move at idle speed.
• The engine accelerates smoothly and quickly.
• The sound of the engine running is smooth, similar to the sound of a four-stroke engine.

Adjusting the carburetor must be treated with all possible care, because errors in the settings can lead to very serious consequences, up to the occurrence of engine malfunction. If you are not completely confident in your abilities, you need to contact the service center.

Scope and design of the Stihl 211 chainsaw

The use of the Stihl 211 chainsaw is quite extensive. She is used to harvest firewood, sawing wood for household or construction purposes, and trim trees in the garden. The characteristics of the saw make it possible to cut trees with a trunk diameter of about 30 cm.Any types of work with this saw can be carried out safely and comfortably due to the improved design and balancing of the entire tool, convenient location of the handles, effective emergency brake.

Unlike similar tools of second brands, the Stihl MC 211 chainsaw has a reliable vibration protection system. There is also a filter with preliminary air purification, a system for reducing fuel consumption. Environmentally friendly operation of the saw is ensured by the 2MIX system, which significantly reduces the amount of harmful substances in the exhaust gases.

This modification, in comparison with the earlier Stihl model, has such improvements as a quick start system (ErgoStart), a convenient mechanism for adjusting the chain tension. The saw can also be expanded with a specially designed carbide chain for 4 times longer life.

Chainsaw carburetor tuning. Or how not to pay repairmen!

Owning a chainsaw makes life much easier even for an amateur, and in some professions this tool is actually irreplaceable. However, like any complex device, a chainsaw requires periodic maintenance. Due to untimely or poor quality maintenance, as well as as a result of the impact of both planned and excessive loads, all sorts of malfunctions may appear. For professionals, saw interruptions or erratic performance Reduces work efficiency or can lead to a ruined working day. One of the fairly common malfunctions is the incorrect setting of the chainsaw carburetor, which gets lost due to unsuccessful attempts to adjust or displace the adjusting screws for other reasons.

Chainsaw carburetor adjustment.

Why might it be necessary to adjust the carburetor even if it seems to start and work? Carburetor adjustments Should be optimal.

In general, the carburetor has a very important effect on the operation of the chainsaw, it is its “brain” indicating how much air and fuel mixture to supply to the cylinder and in what proportion. If the mixture is “rich”, that is, there will be more fuel in it, then as a result we have a loss of power, deposits on the cylinder walls and piston. Which in turn can lead to the failure of the chainsaw. In turn, the “lean” mixture, which has more than the norm in its air composition, also leads to a loss of power, insufficient lubrication of the CPG, scuffing and possibly “jamming” of the engine. Optimal settings of the chainsaw carburetor allows you to get maximum power, extend the engine life, and ensure minimum emissions!

Features and technical characteristics of the saw Stihl 211

The reliability and performance of this chainsaw is ensured by quality materials and workmanship. The main working parts are made of forged steel, the cylinder is chrome-plated, the plastic of the protective cover is strong, designed for high loads.

The basic modification of the Stihl MS 211 14 chainsaw has a two-stroke engine running on a mixture of gasoline and oil. The ratio is standard for 2-stroke engines. gasoline to oil ratio 50: 1.

Also, the tool has the following technical characteristics:

• Power. 2.3 liters. From.;
• Chain pitch. 3/8 inch;
• Chain thickness. 1.3 mm;
• Number of chain links. 50;
• Fuel tank capacity. 270 ml;
• Tire length. 35 cm;
• Weight. 4.3 kg.

Another modification of the Stihl MS 211 16 chainsaw differs only in the increased tire length, which is 40 cm.

Tuning the carburetor of a Chinese chainsaw

The position of the screw L is considered standard for “Chinese” carburetors, at which it is loosened by one and a half turns from fully clamping the position. For screw H. one revolution from the same state. On many people, the L screw is called the quality control of the mixture, and the H screw is called its quantity. Idle speed is adjusted in the same way as described above, with the engine warm.

How to adjust the carburetor on a chainsaw. all the secrets of correct settings

Stable stable operation at any speed, developed power, efficiency, the use of technical capabilities in the amount provided by the manufacturer until now, and even the service life of a chainsaw. all this depends on its carburetor. In addition to the fact that this unit also needs to be kept in proper condition and serviced in a timely manner, it also needs to be properly adjusted. Setting up the carburetor of a chainsaw is not an easy thing, but with a leisurely, thoughtful approach and clearly following the instructions, it is feasible for almost anyone, and it should be carried out at the first sign of the need for this, and regardless of whether the new chainsaw is in operation or well-worn.

In the need to adjust the fuel supply unit (hereinafter referred to as the UPT, that is, the carburetor), the following reasons, symptoms and malfunctions indicate:

• Factory or custom settings were knocked down due to loosening of the adjusting bolts and vibration, or in the process of unsuccessful attempts to adjust the carburetor again;
• Damage to the HVAC housing cover;
• The engine does NOT start or starts with an effort, and then stalls almost immediately;
• The saw DOES NOT run stably at idle or does not hold them at all;
• Excessive fuel consumption and too thick exhaust;
• The spark plug electrodes are black (supplying an over-enriched mixture to the engine) or with a white coating (lean)
• The chain saw does NOT develop maximum rpm or power;
• The engine stalls during a set of revolutions;
• There is a strong vibration of the chainsaw;
• Due to irregularities in the operation of the air-cleaning system, particles of debris have entered the mechanism for distributing the air-fuel mixture;
• In the piston group Significant wear. in this case, the DCC regulation is used as a temporary measure to make the operation of the tool more stable.

Naturally, if dirt gets into it, the fuel system must be flushed. adjusting the carburetor cannot solve this problem. A worn out piston needs overhaul. However, in THESE cases, the setting is also performed.

Chainsaw carburetor adjustment

It may also be necessary to adjust the DCS even if the brand or quality of fuel, atmospheric pressure, humidity and ambient temperature, altitude above sea level changes (when the place of operation changes from a plain to a mountainous area, it is due to the rarefaction of air, and vice versa).

Before adjusting the DCC, it is imperative to make sure that both filters (air and fuel) are clean. In addition, there should be no air leakage into the motor from the side (through oil seals, a gasket under the UPT or its accelerating pump, or elsewhere), otherwise it will NOT be possible to adjust the carburetor.

Preparing to adjust the carburetor

Almost any VAC is regulated by 3 screws:

• 1. Main Jet Bolt, designated “H” and Used to set the saw motor to maximum speed.
• 2. Idle Jet Bolt, designated “L” and Used for low speed setting. That is, to regulate idle speed.
• 3. Bolt adjusting idle speed, designated in different manufacturers in different ways: “S”, “LA” (Stihl), “T” (Partner, Husqvarna).

There are also carburettors with fewer adjusting screws. This is how manufacturers protect their products from unprofessional interference and at the same time try to simplify their customization.

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

• 1. The tool must be stably placed on a flat surface of a rigidly fixed object (workbench, rack, table).
• 2. The chain should be directed away from yourself and others present.
• 3. Between the chain and any surrounding objects there must be a safe distance, which guarantees the impossibility of their mutual contact.

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

We begin to adjust the DCL 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 several times until the desired position is found. After that, we turn “L” 1 / 8-1 / 4 turn (the required value is indicated in the technical documentation for the tool) counterclockwise (hereinafter PRCHS).

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

• If the chain after manipulations with the bolt “L” is stationary, then it is necessary to smoothly rotate “S” (“LA”, “T”) clockwise (hereinafter POChS) until It starts to move. Then we twist “S” 1 / 8-1 / 4 turn back.
• If the chain moves, we rotate “S” (“LA”, “T”) PRCHS until It stops, and then we twist “S” 1 / 8-1 / 4 turns in the same direction.

The engine should run smoothly. And we check it, how it accelerates. It is considered that the motor operates normally in acceleration mode if, when the accelerator is pressed smoothly, the revolutions for a short time and without “dips” increase to their maximum value. If the engine runs unevenly and / or accelerates poorly, then it is necessary to slightly. maximum by 1/8 of a whole revolution. turn the “L” PRCHS. After that, it is necessary to make the above setting “S” (“LA”, “T”) again. We repeat these adjustments until the motor runs evenly and accelerates well.

Chainsaw operation check

Now check the setting of the adjusting bolt “H”. To do this, accelerating the engine to maximum speed. Only it is impossible to drive it for a long time without load, you need to pause. We look at the exhaust and listen to the engine. If there is too much gray smoke coming out of the muffler, and the chainsaw makes a lot of noise, then the carburetor is making an too rich mixture. In addition, the maximum speed of the power unit is lower than it should be. And also carbon deposits will form in it. In this case, it is necessary to slightly tuck the “H” POCH. Then again we check the operation of the engine and, if necessary, repeat the adjustment.

When the chainsaw makes a squealing sound, the engine is very hot, the exhaust is accompanied by a crackling and / or interruptions in ignition are heard, that is, there is a detonation. the mixture is too lean, and the maximum engine speed is higher than it should be. This leads to overheating of the power unit, piston burnout, rapid cylinder wear and candle burnout. In this case, it is necessary “H” to return the PRCHS by 1/4 turn.

At the end of the adjustment, we check the dust at idle speed. With a properly adjusted DCL, it should work like this:

• 1. The chain is motionless.
• 2. The sound of the engine is almost like a four-stroke.
• 3. Pressing the accelerator leads to a quick set of maximum revs.

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 the approximate adjustment. For accurate, you need a tachometer. We do all the same, just turn the adjusting bolts, focusing on the readings of this device. This will allow you to accurately and, most likely, adjust the carburetor from the first time, having achieved, depending on the model of the tool for working with a tree, the idle speed setting at 2800-3300 rpm or higher and maximum. 11000-15000 rpm. Which ones should be set, you should look in the technical documentation (operating instructions) on dust.

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

• Basic. when the engine is not running;
• Final. performed on warm up the engine.

At the first stage, the adjusting screws “L” and “H” are slowly screwed in the POCHS until it stops. In this case, you do not need to make great efforts and try to tighten them. Then we turn both screws back. for many models, dust is 1 turn. And for some. by 1.5 turns. There may be other settings. This should be clarified in the technical documentation for the chainsaw. In some models, the tip is applied directly to the cover of their case near the adjusting screws.

This will perform the recommended factory default carburetor setting. In this case, DO NOT touch the screw “S” (“LA”, “T”), unless, of course, it has already been turned. When he is already twisted, you will have to work with him. Slowly screw in the “S” PRChS until it stops.

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

If “S” had to spin for the above reasons, then the engine, most likely, will NOT start right away. After each attempt, it will be necessary to tighten this screw by 1/4 of the POCHS turn and try to start the engine again. In the end he must earn.

Then we warm up the engine for 10 minutes. If after starting it or in the process of warming up the motor is unstable or the chain starts to move, then it is necessary to slowly and carefully rotate “S” (“LA”, “T”) of the PRChS. As soon as the engine starts running steadily and / or the chain stops, stop adjusting immediately. If the motor stalls, then we turn this screw by 1 / 8-1 / 4 (see the technical documentation) of the POChS turnover.

In the process of warming up, the idle speed may start to increase, then, again, it will be necessary to “S” (“LA”, “T”) start slowly turning the PRCHS until they become normal by ear. On already warming up the engine, we continue to adjust the power supply system assembly, as described in the previous chapter.

After running-in on saws, only fine tuning of the DCS is performed. To do this, you will definitely need a tachometer and technical documentation for the dusting tool used. The fact is that almost optimal settings have already been set at the manufacturer’s factory. Just for running in the engine and grinding in the second moving parts of the chainsaw, the carburetor is set to prepare a slightly more enriched air-fuel mixture than the calculated optimal one. Due to this, the maximum speed is slightly lower than the manufacturer’s design and, in addition, the motor is better lubricated. Thanks to this, the engine running-in and the running-in of the remaining moving parts take place in a gentle mode.

Therefore, if there is no tachometer and / or reliable information (passport data) at the maximum speed and at idle, then it is not worth changing the factory settings after running in, since it will NOT work correctly. And in general, fine adjustment in this case is not necessary. the chainsaw will work fine with the existing basic settings. And if you really do it, then it’s better in a service center. It is recommended to entrust the jewelry tuning of the carburetor of a still completely new tool to specialists.

It is strongly recommended to mark the previous position of the adjustment bolts as accurately as possible before making fine adjustments on your own. This will allow, in case of an unsuccessful attempt, to return them to their place. to the basic factory settings. We start with the bolt “H”. After setting the maximum speed, we check the idle ones. If they differ from normal, set them first with “L” and then with “S” (“LA”, “T”). In doing so, we are guided by the rules and principles set forth in the second chapter of this article. But we turn the adjusting bolts, focusing on the readings of the tachometer. Then we continue to tune the carburetor as described in the same chapter. The screws are steep, follow the tachometer.

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

The basic default setting is as follows:

• 1. Fully tighten the “LD” PRChS to its tight fit.
• 2. Then we turn it back POPS by 2 turns.

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

• Idle speed is too low. with a steep “LD” POChS, Until the chain starts to move, then turn this bolt 1/2 turn back, PRChS;
• The tool chain moves at idle speed. slowly steep “LD” PRChS, until it stops, after which we turn this bolt another 1/2 turn in the same direction.

And it is better to tune with a tachometer, Do not forget that the chain does not have to move at idle speed. The maximum idle speed of the Stihl 180 and 170 models is 13,500 rpm. Idle. 2800 rpm.

Adjust the carburetor of a Stihl chainsaw equipped with a more powerful engine in the same way as described in the previous chapters. This also applies to such the most popular models as Stihl 210, 230 and 250. For basic adjustment (discussed in the third chapter), “L” and “H” after tightening are turned back 1 turn. There are also carbureted saws that have a basic “H” setting of 3/4 turn. By the way, this information is indicated on the instrument case cover.

The angle (step) of rotation of the adjusting bolts during the DCT adjustment is 1/4 turn. Idle speed of the Stihl 210, 230 and 250 models. 2800 rpm, maximum no load. 13000 rpm.