Makita chainsaw dcs4610 carburetor adjustment

Saws STIHL & Partner

In STIHL 250, 361 and Partner 351, 350 chainsaws, the carburetor is adjusted using the H and L screws by setting the proportions of gasoline and air. If you release them, a large part of the fuel will be added and therefore the revolutions will be high, otherwise, on the contrary, they will fall.

Idling speed in Partner chainsaws is regulated with a screw with the letter T, and in Calm, as a rule, you need to look for the aircraft marking. The standard setting of the chainsaw is carried out during the final tests. Basically, after such settings, the percentage of fuel in the working mixture is greater than that of air, which does not correspond to the optimal parameters. But they must be saved during the first hours of operation during the running-in of the device. After that, the saw can be adjusted independently, but it will work well at the factory settings.

But if it is decided to regulate independently, then the actions must be performed in the following sequence:

  • screw adjustment L;
  • then adjust the H jet;
  • after that, go to the idle speed setting using the T screw (if the STIHL chainsaw is LA).

First, screw L must be turned in both directions in order to find the maximum engine speed. If that point is found, then turn the same screw by ¼, thereby slightly slowing down the speed. If at the same time the chain continues to move at idle, it is necessary to immediately turn the screw T (LA) until the chain stops completely.

After setting the maximum speed with screw H, you need to check the frequency with the tachometer. In the event that it does not correspond to those indicated in the service book, the setting must be repeated. When a lot of smoke comes out of the exhaust pipe at maximum speed, then the mixture is too rich in fuel, if noises are heard and the engine is very hot, then on the contrary, it is poor. Then you need to adjust the idle speed. With the correct setting, the engine should sound even at low speeds, while the chain should not move.

Carburetor diagnostics

You can diagnose a breakdown or an unadjusted carburetor yourself. If you observe the following chainsaw malfunctions, check the condition of the carburetor:

  • the tool starts up and stalls;
  • increased vibrations, especially without load;
  • the chainsaw stalls when you press the gas;
  • abundant exhaust with the smell of gasoline;
  • the engine does not start at all, with a normal spark supply.

Operating principle

The purpose of the carburetor is to prepare the working mixture for feeding it into the engine cylinders. This mixture is gasoline and air in the proportions necessary for the engine to work. If this ratio is violated, then the engine will not work clearly. When the mixture has a lot of gasoline, then in unprofessional terminology it is called saturated, and if, on the contrary, there is little, then it is poor. But in any case, a failure in the proportions of the working mixture will have a bad effect on performance.

Different models of chainsaws may have different carburetor designs, but they are all identical in principle. The air moves through a special channel at a speed that can be adjusted by closing or opening the damper. Gasoline, in turn, enters the carburetor through the jets and mixes there with air, creating a special mixture that enters the engine.

The pressure in the float compartment of the carburetor, where the gasoline is before mixing, is close to atmospheric pressure. When you open the damper, the air becomes more, as well as gasoline, due to which the engine speed increases. In this case, a vacuum is created in the air channel and gasoline is drawn into the air stream. This is how the carburetor works.

In order for the chainsaw to work smoothly and efficiently, and also at the same time there was no high fuel consumption, its carburetor must be adjusted accordingly. Before such work, you must first check the air and gasoline filter. If dirt is found on them, then they should be replaced.

Chainsaw tuning for most models, as a rule, is carried out using three screws. high and low speed and idle.

The following signs should indicate the correct setting:

  • The chain must not move when idling.
  • Motor runs smoothly.
  • At the start, there should also be no breaks in the work.

Do-it-yourself chainsaw carburetor repair should be done very carefully, because any mistake made can lead to serious consequences, even before the engine is completely damaged. If you do not have enough experience, then it is better to seek the help of a specialist.

The first signs of a carburetor malfunction

Due to untimely or unprofessional periodic maintenance of the chainsaw, as well as due to heavy load, difficulties may arise in its operation from time to time. For professional workers, such breakdowns can reduce their efficiency and ruin the mood for the whole day.

Carburetor malfunctions, in turn, have specific symptoms. From them you can immediately determine the cause of the breakdown.

The following signs indicate an incorrect carburetor setting:

  • The tool starts up problematic, after which it immediately stalls.
  • Chainsaw stalls when you press the gas.
  • Gasoline is consumed in large quantities, and it still remains in the cylinders and does not burn out to the end, and the exhaust is excessively thick.
  • Carburetor settings set at the manufacturer’s factory are knocked out due to improper use or self-adjustment.
  • Debris has entered the air intake system. Because of this, she went out of order.
  • The engine pistons are used up. Adjusting the carburetor in this case will only temporarily solve the problem.
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In the event that dirt gets into the carburetor, one setting is not enough. Here you just need to clean it. When the pistons are used up, then an overhaul of the engine is required.

Makita DCS4610 Chainsaw

But after that, of course, you need to adjust the carburetor nozzles, as well as purge and clean them.

Adjusting your Husqvarna chainsaw

During the break-in period of the Husqvarna 142, 240, 236, 137 chainsaw and other similar models, the carburetor settings are set in such a way that the engine speed is 600-700 less than normal working ones. In the event that the operating frequency cannot be adjusted by the tachometer, it is not recommended to knock down the factory settings with the H screw.

The manufacturer expressly prohibits exceeding the working number of revolutions independently. When, after adjusting the carburetor, the chainsaw chain moves at idle, then by turning the screw T counterclockwise, you need to stop it.

In order to adjust the saw accurately, it must be placed on a flat surface with the bar forward. You also need to warm up the engine for at least 12-15 minutes. The highest idle frequency number should be determined first. To do this, screw L must be turned clockwise in the chainsaw, and then in the opposite direction. After determining the desired frequency, the same screw is turned counterclockwise from 12 to 25% of its full turn.

Idle speed in the models of this manufacturer is adjusted using a jet with the letter T. Adjustment is made by turning it clockwise until the chain moves. Then turn lightly counterclockwise until the chain stops moving.

The screw H of the chainsaw is adjusted correctly only when the saw does not make a lot of noise when the gas is pressed all the way, and at the same time it does not become heavier with any load.

In the event that the saw is too noisy during operation and smokes, then this jet must be turned from left to right to adjust.

Chainsaw carburetor adjustment away from the workshop

Instructions on how to set up a chainsaw are in the technical documentation for your tool. Nevertheless, we will consider typical operations to improve the performance of the tool.

The carburetor controls are easily accessible. There is no need to remove the housing cover to get to them. The adjustment holes may be positioned differently in different models, the illustration shows a typical combination.

Makita chainsaw dcs4610 carburetor adjustment video

A chainsaw is a tool that will come in handy in any summer cottage, even for amateurs, not to mention professional workers. But, like any other device, a chainsaw needs constant care and prevention. One of the most common procedures is adjusting the carburetor of a chainsaw due to a past misalignment.

Makita carburetor. device, do-it-yourself adjustment using the example of DCS4610, repair

Makita chainsaws are very reliable tools, but even in them, over time, it becomes necessary to adjust the carburetor and even repair. How to do this with your own hands, what is needed and what pitfalls arise in the process, we will talk within the framework of this article.

makita, chainsaw, dcs4610, carburetor

Step-by-step adjustment algorithm

Before adjusting the carburetor of the Makita DCS4610 chainsaw, it is recommended to replace the fuel and air filters. The adjustment is made with three screws. Screws L and H are responsible for the ratio of the mixture of gasoline and air. Screw L is the setting for engine operation at low rpm. H on high. Screw S adjusts idle speed.

The manufacturer, in the instructions for Makita chainsaws, strongly recommends adjusting the carburetor operation only using screw S. Since it is stated that the chainsaw is set at the factory at air pressure in accordance with sea level and adjustment with screws L and H is not required.

Here is a description of how to set up a Makita DCS4610 chainsaw carburetor according to the instructions.

Attention! To adjust the carburetor, you do not need to remove the covers and disassemble the chainsaw, the whole process is carried out through the holes on the side, in the saw body.

If this setting did not help and ignoring the manufacturer’s recommendations does not scare you, you can adjust the carburetor using the L and H screws. Setup begins with the installation of the screws. They are screwed in all the way, and then returned one and a half turns.

Further, the setting is divided into several stages:

  • Adjustment at low rpm to achieve continuous operation. The engine should be allowed to warm up a little. Further, using the screws L and S, they ensure that the engine runs stably and the chain does not rotate at idle. Screw L is turned to maximum speed, then lowered by 1/4. Next, the idle speed is brought to normal with the screw S.
  • Adjustment at high speeds, so that their number is not exceeded above the permissible level and there is no increased engine wear. According to the readings of the tachometer, turning the screw H, they ensure that the number of revolutions at full throttle does not exceed the maximum permissible. Exceeding the maximum permissible speed is undesirable and can lead to increased engine wear and damage.
  • Fine adjustment of the carburetor with screw S as indicated in the instructions.
  • Checking the operation of the chainsaw in practice in all modes.

Adjusting the carburetor of the Makita DCS4610 chainsaw with your own hands

Changing carburetor settings may be necessary in the following situations:

  • Unstable engine operation. The reason is a lean fuel mixture.
  • Excess fuel consumption, black color of the exhaust. The reason is the fuel-air mixture is oversaturated, and its complete combustion does not occur.

Also, adjustment can help if the chainsaw does not start well or does not work stably at idle.

Before you start self-adjusting the carburetor, you should familiarize yourself with its structure, mechanism of operation and the required set of tools.

What you need (tools, materials, devices)

To adjust the carburetor of the Makita DCS4610 chainsaw, you need a fairly small set. The main adjustment tool is a Phillips or narrow flat screwdriver. You will also need a tachometer to accurately determine the number of revolutions.

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Gloves are recommended to protect your hands.

Makita chainsaw carburetor repair

Symptoms that adjustment is no longer necessary, and the carburetor of the Makita chainsaw needs to be repaired:

  • arbitrary changes (abrupt) engine power;
  • excess fuel consumption;
  • increased vibration and popping;
  • “Sneezing” and unstable engine operation;

And of course, a clear symptom is that the engine does not start or stalls.

To repair the carburetor, you will need to remove it, it is located immediately under the top cover of the chainsaw and the air filter.

The location of the carburetor in the Makita chainsaw.

Repair yourself or entrust the pros

The question is sensitive enough. You can only make a decision to repair a Makita chainsaw carburetor yourself if you are fully confident in your abilities. Certain knowledge of the mechanics and operating principle of the carburetor is required.

The carburetor is a rather complex part of the engine, it has small parts and you need high accuracy and dexterity to replace them. As for the malfunctions, almost everything can be eliminated on your own, since they boil down to finding the damaged element and replacing it. Parts cannot be repaired, you do not need to edit anything with a hammer.

In general, you need to soberly assess your capabilities, if in doubt, it is better to contact the service center.

What carburetors are used on Makita chainsaws

Makita has a wide range of chainsaws, they are equipped with Zama diaphragm carburetors.

When carburetor adjustment is necessary?

Initially, from the moment the tool 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 motor stalls either immediately or after a few seconds;
  • the engine cannot be started at all;
  • the chainsaw “shoots”, there are sharp claps in the engine of the tool.

Note! The reason for poor engine performance may be the worn out piston group, then adjusting the carburetor of the chainsaw does not give a full solution to the problem. Also, no setting will give the expected effect if the node is not cleaned of small particles of debris in parallel. The most problematic elements are jets and filters, both gasoline and air.

It should be noted that during the running-in of a new engine, the carburetor is adjusted 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 (there are usually two or three of them).

Step-by-step adjustment algorithm

Before adjusting the carburetor of the Makita DCS4610 chainsaw, it is recommended to replace the fuel and air filters. The adjustment is made with three screws. Screws L and H are responsible for the ratio of the mixture of gasoline and air. Screw L is the setting for engine operation at low rpm. H on high. Screw S adjusts idle speed.

The manufacturer, in the instructions for Makita chainsaws, strongly recommends adjusting the carburetor operation only using screw S. Since it is stated that the chainsaw is set at the factory at air pressure in accordance with sea level and adjustment with screws L and H is not required.

Here is a description of how to set up a Makita DCS4610 chainsaw carburetor according to the instructions.

Attention! To adjust the carburetor, you do not need to remove the covers and disassemble the chainsaw, the whole process is carried out through the holes on the side, in the saw body.

If this setting did not help and ignoring the manufacturer’s recommendations does not scare you, you can adjust the carburetor using the L and H screws. Setup begins with the installation of the screws. They are screwed in all the way, and then returned one and a half turns.

Further, the setting is divided into several stages:

Бензопила Makita DCS4610-35

  • Adjustment at low rpm to achieve continuous operation. The engine should be allowed to warm up a little. Further, using the screws L and S, they ensure that the engine runs stably and the chain does not rotate at idle. Screw L is turned to maximum speed, then lowered by 1/4. Next, the idle speed is brought to normal with the screw S.
  • Adjustment at high speeds, so that their number is not exceeded above the permissible level and there is no increased engine wear. According to the readings of the tachometer, turning the screw H, they ensure that the number of revolutions at full throttle does not exceed the maximum permissible. Exceeding the maximum permissible speed is undesirable and can lead to increased engine wear and damage.
  • Fine adjustment of the carburetor with screw S as indicated in the instructions.
  • Checking the operation of the chainsaw in practice in all modes.

Algorithm of actions for setting

The carburetor of the chainsaw is tuned in two stages:

  • basic stage (engine on);
  • stage two. perform when the engine is warm.

Important! Some setup steps need to be adjusted depending on the Makita chainsaw model. In order to do everything right, read the instructions.

  • Turn the screws for adjusting high and low speeds until they stop (turn clockwise).
  • At the moment of meeting resistance, make one and a half turn back.

Screw marked T, move clockwise. Release it only when the engine starts to run stably. At the same time, keep in mind that the chain should not move at this stage.

What if the engine shuts off during idle tuning? In this case, it is important to quickly turn the screw until it stops (turn clockwise). If manipulation causes the chain to move, turn the adjusting screw slowly back to its original position.

Repair Makita DCS 4610 (access for oil pump)

How to set up a China-made saw?

The design of the carburetor on Chinese chainsaws is no different in principle. The order and principle of adjustment also do not differ and are performed in the same order. The only difficulty that may arise during the execution of work is determining the purpose of the adjusting screws. Typically the T screw is at the top, while the H and L are at the bottom of the carburetor body. One more, additional screw may be present.

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Figure 3. Location of adjusting mechanisms

Usually, their purpose is determined empirically, slightly changing the position and monitoring the result. After the purpose of the elements is clearly defined, further customization is not difficult and is performed in the usual manner.

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

The adjustment should 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 to check if the carburetor is set correctly?

To do this, you need to speed up the work of the chainsaw. Run the engine at maximum speed to objectively assess its performance. When you press the accelerator, the rotation speed should reach approximately 15 thousand revolutions per minute. This indicator indicates that the carburetor tuning was successful.

If you cannot achieve such an indicator at high revs, and the acceleration is slow, you need to re-adjust the carburetor, working only with the screw marked L. Turn it counterclockwise. In this case, you need to rotate the screw slowly so that the rotation does not exceed 1/8 of the full rotation.

If the opposite problem arises and the maximum rotation indicators need to be reduced to 15 thousand, you need to rotate the screw marked with the letter H. Rotate it gradually, slowly in the opposite direction of the clockwise movement.

Reducing the RPM to the optimal value will reduce the risk of engine operation for wear.

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 idling of the motor. It can also be designated by the letters LA or S, on some models of carburetors 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 when adjusting). This information is available in the instructions for the chainsaw. Then you need to prepare the workplace. lay the saw on a flat horizontal plane, directing the chain in the opposite direction from you. Detach all covers, remove foam rubber and air filter. At this, the preparatory operations are considered completed, you can proceed to the main part of the work.

  • Smoothly tighten the screws H and L clockwise until they stop. Be careful not to break the screws. this will cause a 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 the screws H and L, alternately adjust the rotation of the shaft at maximum and minimum revolutions.
  • By adjusting 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. It is important to monitor whether the chain is idling or not. If it moves, turn the screw a little more counterclockwise.

Important! It is better not to adjust the screw H for an inexperienced person. If it is not set correctly, a lean air-fuel mixture will be supplied to the combustion chamber of the cylinder at maximum speed. This will lead to accelerated wear of the piston group.

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 stationary;
  • there is no excessive smoke from the exhaust pipe while the engine is running;
  • 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 established 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.

What carburetors are used on Makita chainsaws

Makita has a wide range of chainsaws, they are equipped with Zama diaphragm carburetors.