Chainsaw Husqvarna (Husqvarna) 137. carburetor adjustment.
The best advice that I can give you is to contact the specialists! Believe me, for very little money, specialists will adjust the carburetor, check the general condition of the saw. But if you still need to adjust the carburetor on the Husqvarna 137 saw yourself, then I will try to describe this process in detail. Also at the end of the post I added a video on how to adjust the carburetor of a chainsaw at idle.
More detailed instructions on how to adjust the chainsaw carburetor here: How to adjust the chainsaw carburetor step by step!
Adjusting and adjusting the carburetor Husqvarna 137
husqvarna137 carburetor adjustment
In the picture above, you can see three adjustment screws. Each of them has its own purpose:
The T screw is required to adjust the idle speed.
Screw L is used to adjust low rpm.
Screw H adjusts high rpm.
Adjustment procedure:
First, with the L screw (rotating it), we look for the highest idle speed. After we have found them, it is necessary to turn this screw a quarter of a turn against the clock hand. If in this position the chain continues to rotate, then by rotating the screw T we achieve its stop.
Then we warm up the engine at full speed in the region of 10-15 seconds and turn the screw H a quarter counterclockwise. We wait 10 seconds and listen – the engine should work like a 4-stroke in sound. If a screeching sound is heard, then the mixture is poor (unscrew the screw), if it smokes, the enriched mixture (tighten the screw).
After adjusting the low and high speeds, we set the idle speed with screw T. This is done as follows:
1.The engine must be running
2.Turn the screw T clockwise until the chain starts to rotate.
3.Rotate the screw in the other direction until the chain stops.
With a properly adjusted carburetor, your chainsaw quickly picks up speed and sounds like a 4-stroke engine..
Remember that a tachometer and experience are required to properly adjust the carburetor of your chainsaw. Therefore, it is better to contact a specialized service.!
Video about adjusting the chainsaw at idle speed:
Another video about Husqvarna carburetor repair in English.
How to adjust the carburetor on a chainsaw and properly adjust the idle speed with your own hands
For self-tuning the carburetor, you need to familiarize yourself with its device and remember the order of work that is carried out to adjust the parts responsible for the correct functioning of the constituent elements of the device and nearby parts. It is necessary to carefully handle objects for adjusting the chainsaw system, and also to determine the correspondence of the set parameters to the maximum permissible values.
The main stage
The engine turns on at medium speed and warms up for about 10 minutes. The screw responsible for adjusting the idle speed must move clockwise. It is released only when the engine comes into stable operation. It is necessary to check that the chain does not move during this process..
In idle mode, the engine may stall (the reason is here). In this case, 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..
Dismantling the carburetor if it is necessary to check or repair components
The device of different models of carburetors 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 below so that you can successfully place the items in place at the end of the repair work..
- The top cover is removed. To do this, unscrew the 3 bolts holding it in a circle.
- The foam rubber can also be removed, since it is the upper part of the filter that conducts air.
- The fuel hose is removed.
- The drive thrust is output directly to it.
- The cable end is detached.
- The petrol hose can be completely removed by systematically pulling it off the fitting.
To finally prepare the carburetor for overhaul or replacement of the smallest parts, you need to carefully disconnect it from the main system. Sometimes further disassembly is required. Unscrew the components carefully and fold the fasteners in groups, as these small parts are easily lost.
How to adjust the maximum RPM
To limit this value, you need to use the screw marked H. To increase the number of revolutions, turn it clockwise, and to decrease them in the opposite direction. The maximum frequency should not exceed 15000 rpm.
If you make this indicator higher, the engine of the device will work for wear, which will lead to problems in the ignition system. When turning this screw, you need to take into account the ignition processes of the device. If the slightest glitches appear, then the maximum speed value must be reduced.
How to properly adjust a factory saw
Carburetor adjustment is divided into two main steps. The first is called basic. It is performed with the engine running. The second is performed when the engine is warm.
To carry out the procedure for setting up the carburetor successfully, you need to read the operating instructions for a particular model in advance to identify additional features of setting up the device.
Checking acceleration work
A little research needs to be done. Device acceleration is initiated. The serviceability of the engine should be assessed during the maximum revolutions. When the engine is functioning correctly, then when you press the accelerator, the speed quickly increases to 15,000 rpm..
If this does not happen or the increase in speed is too slow, you must use the screw marked with the letter L. It turns counterclockwise. Moderate movements must be observed, since the turn cannot be more than 1/8 of a full circle.
Final check at idle speed
Before this procedure, it is necessary to perform a full adjustment of the components of the carburetor when operating at maximum speed. Next, you should check the functioning of the device in idle cold mode. When the correct parameters are achieved during the adjustment, you will notice that the carburetor design exactly matches the following criteria:
- When the idle cold mode is connected, the chain does not move.
If violations are noticed in the above parameters or the device has not been completely 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.
How the carburetor works on a Husqvarna 137 chainsaw?
On chainsaws of these models, the Walbro carburetor is most often installed from the factory. Before adjusting the Walbro carburetor on a Husqvarna chainsaw, you must have a minimum understanding of its structure and know how it works..
Do-it-yourself Husqvarna carburetor adjustments?
In order to correctly adjust the carburetor of the chainsaw, you need to stock up on the appropriate tool in advance..
You will need the following list:
- The most common screwdriver, with which you can unscrew or tighten the adjusting screws;
- A tachometer designed to count the revolutions of the crankshaft. It is necessary when adjusting the idle speed, since it is quite problematic to determine the number of revolutions per minute by ear;
- Phillips screwdriver. It is needed to be able to unscrew the screw (T);
- Compressor with a special gun connected to them. The blowing device will help get rid of excess debris and dirt, since the carburetor must always be clean.
Many Husqvarna chainsaws use a special section adjusting bolt. See in advance which ones you have installed and purchase the appropriate kit. This will help to avoid many difficulties at the initial stage..
What is responsible for the air supply
Two dampers are responsible for the air supply, installed on the diffuser chamber. The first can regulate the amount of air at the moment the accelerator is pressed and is called the throttle, and the second ensures the restriction of the air supply at the moment when the chainsaw is cold started. To facilitate starting, the flap is closed, which means that the mixture becomes rich, as it is saturated with a large amount of fuel. It is easier to work in this mode, but since it increases fuel consumption, this mode is not applied throughout the entire operation. The saw is worn out.
A non-return valve is used to spray fuel into the cylinders..
The principle of operation is simple: it restricts the return of the mixture back to the chamber. All the main malfunctions of chainsaws, most often, manifest themselves when this mechanism does not work properly.
- The most common mistake is storing the instrument for too long. The fact is that with prolonged inactivity, the valve sticks and either fills the cylinder with fuel, or simply does not open.
- The second problem is an increase in the amount of air in the mixture, caused by its suction from the outside when the valve does not work properly. It is no longer possible to regulate here, since in this case only valve repair or its replacement helps, since the saw will not react to the adjusting screws.
Unlike the car, the carburetor setting of the chainsaw provides for three adjusting screws that are responsible for the quality of the mixture, the amount and nominal speed of the crankshaft of the Husqvarna engine:
- screw L – designed to adjust the number of revolutions when operating in medium modes and regulates low revolutions;
- Screw H – adjusts the number of high revolutions and thrust of the installation;
- T – designed to adjust the total amount of fuel and adjust the operation of the throttle assembly.
It is not recommended to touch the first two screws without special skills. The problem is that if you configure them incorrectly, then the carburetor will not be able to start the engine, or even start it in the wrong operating modes. Such adjustment of the screw can lead to its early wear and failure. This principle is embedded in many devices..
No table lists the settings parameters. Therefore, you should not look for these data in special literature, but only strictly follow the instructions. The table in the passport has only informational value regarding the characteristics of the engine.
What is responsible for the supply of a mixture of fuel and oil
For accurate delivery of fuel with oil, the operation of the fuel pump is used, which is mechanically driven from the crankshaft. The carburetor itself is equipped with a diaphragm and a special needle valve, which are responsible for regulating the pressure in the system. Thanks to them, the correct operation of the metering chambers and the pump is organized, which improves the operation of the chainsaw..
When carburetor adjustment is necessary?
The reasons why it will be necessary to adjust this unit can be listed for a very long time..
Among the main malfunctions are the following:
- Increase in idle speed;
- The appearance of a large amount of smoke during operation;
- Deterioration of starting properties;
- Insufficient tool power when cutting.
This is not a complete list of all known faults. Sometimes a procedure such as adjusting the carburetor on a Husqvarna chainsaw may need to be done after a major overhaul of the power plant or after maintenance..
The developers of the Husqvarna 137 write in the passport that the carburetor adjustment must be carried out before and after running in the tool..
What is the factory setting of a Husqvarna chainsaw carburetor?
In order for the saw to start anyway, even if the setting is incorrect, the factory settings of the screws H and L are applied. Most Husqvarna chainsaws can be started by unscrewing both screws exactly one and a half turns. Only then can the position of the screws be changed in order to achieve the desired fuel consumption and maximum efficiency. It is regulated by XX also after these manipulations..
If you still have questions about adjusting the carburetor on the Husqvarna 137 chainsaw and other models of this line, I recommend watching this
Adjusting the carburetor of a Husqvarna chainsaw
Like all other saws, the husqvarna has the same carburetor adjustment algorithm. Therefore, the instructions will be relevant for other tools and models of chainsaws such as Husqvarna 142.236.
Before starting work, make sure that the air filter is clean and that all other components are working properly. The fuel supply to the float chamber should work without interruptions, and the ignition system is configured correctly and has a fresh spark plug.
- Set the carburetor to factory settings. This must be done with the engine stopped..
- Now you can start the engine and be sure to warm it up for a few minutes. Adjustment of the XX carburetor of the Husqvarna 137 is carried out only on a warm engine.
- Turning screw L clockwise, you need to set the highest speed of the crankshaft, then turn it back a quarter of a turn. Adjust the speed of the crankshaft with the screw T so that the chain does not rotate. It should not be set in motion without pressing the accelerator..
- Now you need to set the maximum speed and their power. It is enough to connect the tachometer to the ignition system and set the maximum possible speed using the accelerator. Compare them with your passport data. If they differ, then unscrew or tighten screw H. By changing the range, you can create restrictions to make the saw work efficient and save the motor resource.
How to properly adjust the carburetor on a chainsaw?
Before adjusting the carburetor on a chainsaw, you will need to study the meaning of the three screws required for adjustment. These screws have specific markings and names:
- Screw “L” is required for low speed adjustment;
- The “H” screw is required when tuning the motor for high speed operation;
- Screw “T” is needed to adjust idle speed.
It is worth noting that some chainsaws are equipped with only one “T” screw, so the carburetors of such models are adjusted by manipulating only this screw..
No matter how many screws there are on the chainsaw, the factory settings of the carburetor are the most optimal for its operation. The screws themselves were originally used to adjust the chainsaw to work in certain weather conditions..
Chainsaw carburettors with three screws should be adjusted using the “L” and “H” screws. To increase the speed, they should be turned clockwise. In order to reduce the speed, the screws turn against it. To adjust the carburetor, you need a special screwdriver for adjustment – it will not slide off the screws and damage the threads on their “caps”.
The carburetor adjustment process consists of two stages: initial and main. The algorithm of actions during adjustment is as follows:
- During the first step, screws “L” and “H” must be tightened clockwise to the very end;
- After that, these screws must be turned 1.5 turns in the opposite direction;
- At the second stage, you need to start the chainsaw and leave it for 10 minutes to fully warm up;
- Then start turning the screw “T” until the chainsaw motor starts to run stably and the chain on the bar does not rotate..
Chainsaw carburetor device – simple and affordable
As is the case with other chainsaw units, before repairing the carburetor, you should study its design in detail. This will help determine the true breakdown and quickly fix it. The design of the chainsaw carburetor consists of the following elements:
- Tube – equipped with a transverse damper that regulates the ingress of air into the system;
- Diffuser – Located next to the fuel inlet. As the diffuser narrows, the air flow rate into the system increases;
- Fuel needle – serves to distribute fuel;
- Float chamber – adjusts the fuel level at the point of entry into the channel.
For a better understanding of the design of the unit, you will need a chainsaw carburetor diagram. It clearly demonstrates the location and method of connecting the main elements of the node..
The principle of operation of a chainsaw carburetor is quite simple. The needle sprays fuel into the float chamber, after which the fuel is mixed with air. Then the finished mixture enters the engine cylinder. The more fuel is supplied to the engine, the higher the number of revolutions of the engine.
Regardless of the manufacturer and model of the chainsaw, each of the modern tools is equipped with carburetors that have an almost identical design and work according to the same principle. The main differences lie in the materials of spare parts and their location in the carburetor device.
How to check a chainsaw carburetor?
After adjustment, check acceleration, maximum RPM and engine idling. In the process of checking the first parameter, you should sharply press the gas trigger. If at the same time the motor does not start to pick up speed, then it is necessary to turn the screw “L” counterclockwise. In this case, one turn should not exceed 1/8 of the full circle of the screw..
To measure the maximum speed, you will need to use the screw “H”. In order to increase the maximum speed, the screw is turned clockwise. To decrease the indicator, the screw must be turned in the opposite direction. It should be remembered that the maximum number of revolutions should not exceed 15 thousand.
For a final check of the chainsaw when idling, you need to start the tool and put it on a flat place. Let the engine warm up and pay attention to the following parts of the chainsaw:
- Chain – must not move;
- Motor – when you press the gas trigger, it should confidently pick up speed until it reaches the set maximum limit.
An important tip – if the carburetor is configured correctly, the sound of the chainsaw motor will strongly resemble the sound when a 4-stroke engine is running.
In a similar manner, the carburetor of a Chinese chainsaw is adjusted and checked. The only difference is that the process of setting up such instruments can take much more time – on average, about an hour. In addition, it should be remembered that the adjustment of Chinese chainsaws is required much more often – it often needs to be done immediately after running in a new tool..
How to remove a carburetor from a chainsaw?
Before cleaning the carburetor or repairing it, this element of the chainsaw will need to be dismantled and disconnected from other components. To do this, you must follow a certain procedure. The dismantling algorithm is as follows:
- First, remove the top cover by unscrewing 3 bolts around its perimeter;
- Remove the filter in the form of a foam pad;
- Disconnect the fuel supply hose;
- Remove the drive rod;
- Disconnect the cable end;
- Carefully remove and fully pull out the fuel hose.
Try to perform each of the actions as carefully as possible. Otherwise, there will be a risk of damage to important parts of the chainsaw..
Chainsaw Carburetor Adjustment – When Procedure Required?
- The engine does not start at all, or it stalls immediately after it starts up – the reason for this may be a lack of fuel paired with an excess of air;
- Increased fuel consumption – in this case, the amount of exhaust gases increases rapidly. The reason for this situation should be sought in an increase in the amount of fuel and a decrease in the amount of air;
There are also a number of mechanical reasons that lead to the need to adjust the carburetor. These include:
- Severe vibration – this will damage the protective cap, resulting in a loss of fixation of all three adjusting screws;
- Wear of the piston part of the engine – in such a situation, adjusting the carburetor will only temporarily prolong the operation of the tool. To completely eliminate the malfunction, you will have to completely replace the piston group;
- Blockages – they appear as a result of the use of low-quality gasoline, filter damage or scale. In such cases, it will be necessary to dismantle, disassemble and clean the carburetor..
Homemade 2 Cycle Carburetor Adjusting Tool
In any of these cases, it is best not to overtighten with the adjustment or flushing procedure. Otherwise, this will lead to breakdown of other, no less important elements of the chainsaw..
Chainsaw carburetor – device, adjustment and flushing with your own hands
The carburetor is an integral part of the chainsaw, the function of which is to mix the fuel mixture with air and then supply the finished fuel to the engine of the tool. Despite the high reliability of modern carburetors, they are often subject to various breakdowns, which entails a complete stop of the chainsaw engine. Let’s look at the design of this important unit and how to troubleshoot it yourself..
How to clean a chainsaw carburetor?
Flushing the carburetor of the chainsaw is required in cases where low-quality fuel is used to refuel the tool, or the tool is used at extremely low temperatures. In the process of work, you need to try not to damage or lose the small parts of the unit. Carburetor cleaning is performed in this order:
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 hands that do not grow from the shoulders. In this case, 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 unscrewed). After that, it must be cranked 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 internal combustion engine does not stall, but the chain is still in place.
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How does a chainsaw carburetor 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, however, carburetor models will hold the palm for a long time, because their cost is 5-15 times lower than that of 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 jets. 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..
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 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.
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 therefore we invite the reader to pay attention to the example below..
To make the adjustment, you only need a slotted screwdriver, however, it will not be possible to perfectly 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 set up the carburetor in a given situation..
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..
You can learn more about the master class on adjusting the carburetor of a chainsaw in this video.
When does the carburetor of a Husqvarna chainsaw need adjustment?
There are a lot of problems that can be solved by adjusting the carburetor. Adjusting the carburetor of your Husqvarna chainsaw is necessary when such malfunctions appear:
- increased idle speed;
- strong smoke during tool operation;
- Difficulty starting a cold or hot engine;
- lack of traction and reduced maximum revs.
This is by no means a complete list of problems that can be solved by tuning the Husqvarna carburetor. In some cases, adjusting the quality and quantity of the fuel mixture is carried out after an engine overhaul or in the process of scheduled maintenance of the chainsaw.
Husqvarna AB recommends adjusting the carburetor before and after running in the saw..
Adjusting the carburetor of a Husqvarna chainsaw
Modern chainsaws have a complex system and consist of several main units that periodically require maintenance and adjustment. In this article, we’ll talk about how to adjust the carburetor on a Husqvarna chainsaw..
- When does the carburetor of a Husqvarna chainsaw need adjustment?
- The structure and principle of operation of the Husqvarna carburetor
- Tools required for work
- Algorithm and description of setting the carburetor Husqvarna
- Nuances of adjustment
- Factory settings
- DIY carburetor repair
- Output
Nuances of adjustment
After making the adjustment, the chainsaw should easily pick up and drop speed, work stably at low and high speeds. If the saw chain rotates at idle speed after adjusting the carburetor control screws, this is a sign that the adjustment has been made incorrectly and it is necessary to correct the position of the screw (T).
Also, when adjusting the Husqvarna carburetor, it is worth considering the response time of the chainsaw to the rotation of the screws. The settings do not change immediately, but within five, ten seconds.
One of the indicators of an incorrect adjustment is a strong smoke during the operation of the saw, which indicates a large amount of fuel entering the combustion chamber. If such a situation arises, you need to correct the position of the screw (L).
Factory settings
The factory default setting for the Husqvarna carburettor is the position of the screws (H) and (L), in which a working chain saw is guaranteed to start. For Husqvarna tools, this is one and a half turns from fully tightened screws (H) and (L).
In the process of adjustment, you must first set the screws to the standard position, then start the chainsaw and make precise adjustments to the power, the number of maximum revolutions and idle speed..
Algorithm and description of setting the carburetor Husqvarna
Husqvarna carburetor, adjustable in the same way as carburetor settings on other brands of chainsaws.
Immediately before adjusting, it is necessary to carry out a complete diagnosis of the saw and make sure that there is no obstruction of the fuel supply and air leakage into the crankcase of the chainsaw. It is also necessary to make sure that the air filter is clean and, if necessary, replace it with a new one..
The order of work:
- Saw muffled with Husqvarna carburetor factory setting.
- The engine starts and the saw warms up for a few minutes.
- By turning the screw (L) clockwise, the position is found at which the engine develops maximum speed, after which the screw must be unscrewed 1⁄4 back. If at the same time the chain of the chainsaw rotates, then it is necessary to reduce the idle speed by adjusting the position of the screw (T).
- The next stage is adjusting the power of Husqvarna at maximum speed and adjusting their number. To do this, the tachometer is connected to a running chainsaw, the throttle stick is squeezed out to full, after which the tachometer readings are checked. If the value of the maximum revolutions differs from the maximum number recommended by the manufacturer, then by changing the position of the screw (H), the tachometer readings are returned to normal.
DIY carburetor repair
If in the process of carrying out a full diagnosis of the Husqvarna chainsaw, carburetor defects were found, then some of them can be repaired without contacting a Husqvarna AB service center. For example, you can independently:
- change the gaskets under the covers of the main chamber and the fuel pump;
- clean or replace the strainer;
- replace the diaphragm or needle valve of the main chamber;
- troubleshoot the fuel pump diaphragm.
Gaskets, diaphragms and a rocker needle valve can be found in the repair kit provided for each Husqvarna chainsaw carburetor model..
Also, if you have some experience, you can try to restore the faulty injector valve, but you cannot guarantee a positive result when you try to restore the injector, if it is faulty, the manufacturers recommend changing the carburetor completely. To do this, you need to perform the following series of actions:
- Before removing the carburetor, clean the saw with a compressor, as dirt can interfere with a quality repair.
- Next, open the top cover of the chainsaw, remove the air filter, disconnect the rods from the air and throttle control levers.
- After that, unscrew the screws securing the carburetor.
- Disassemble the carburetor body for repair. This is quite simple to do. The main chamber cover is held in place by four screws, which can be removed with a regular screw, the fuel pump cover is secured with one wide screw.
Below is a video that will make it clear how exactly you can repair the carburetor without contacting a Husqvarna service center.
Tools required for work
Before proceeding with the tuning of the Husqvarna carburetor, you need to take care of having all the tools that may come in handy. To carry out this type of work yourself, you will need:
A regular slotted screwdriver will not work for adjustment, as the adjusting screws on Husqvarna chainsaws may have different cross-sections. You will have to purchase a special, this is a feature of repairing Husqvarna chainsaws, they did everything so that the saw could be repaired only in a specialized Husqvarna service.
Adjusting the carburetor of a Husqvarna chainsaw
Modern chainsaws have a complex system and consist of several main units that periodically require maintenance and adjustment. In this article, we’ll talk about how to adjust the carburetor on a Husqvarna chainsaw..
- When does the carburetor of a Husqvarna chainsaw need adjustment?
- The structure and principle of operation of the Husqvarna carburetor
- Tools required for work
- Algorithm and description of setting the carburetor Husqvarna
- Nuances of adjustment
- Factory settings
- DIY carburetor repair
- Output
Tools required for work
Before proceeding with the tuning of the Husqvarna carburetor, you need to take care of having all the tools that may come in handy. To carry out this type of work yourself, you will need:
A regular slotted screwdriver will not work for adjustment, as the adjusting screws on Husqvarna chainsaws may have different cross-sections. You will have to purchase a special, this is a feature of repairing Husqvarna chainsaws, they did everything so that the saw could be repaired only in a specialized Husqvarna service.
When does the carburetor of a Husqvarna chainsaw need adjustment?
There are a lot of problems that can be solved by adjusting the carburetor. Adjusting the carburetor of your Husqvarna chainsaw is necessary when such malfunctions appear:
- increased idle speed;
- strong smoke during tool operation;
- Difficulty starting a cold or hot engine;
- lack of traction and reduced maximum revs.
This is by no means a complete list of problems that can be solved by tuning the Husqvarna carburetor. In some cases, adjusting the quality and quantity of the fuel mixture is carried out after an engine overhaul or in the process of scheduled maintenance of the chainsaw.
Husqvarna AB recommends adjusting the carburetor before and after running in the saw..
DIY carburetor repair
If in the process of carrying out a full diagnosis of the Husqvarna chainsaw, carburetor defects were found, then some of them can be repaired without contacting a Husqvarna AB service center. For example, you can independently:
- change the gaskets under the covers of the main chamber and the fuel pump;
- clean or replace the strainer;
- replace the diaphragm or needle valve of the main chamber;
- troubleshoot the fuel pump diaphragm.
Gaskets, diaphragms and a rocker needle valve can be found in the repair kit provided for each Husqvarna chainsaw carburetor model..
Also, if you have some experience, you can try to restore the faulty injector valve, but you cannot guarantee a positive result when you try to restore the injector, if it is faulty, the manufacturers recommend changing the carburetor completely. To do this, you need to perform the following series of actions:
- Before removing the carburetor, clean the saw with a compressor, as dirt can interfere with a quality repair.
- Next, open the top cover of the chainsaw, remove the air filter, disconnect the rods from the air and throttle control levers.
- After that, unscrew the screws securing the carburetor.
- Disassemble the carburetor body for repair. This is quite simple to do. The main chamber cover is held in place by four screws, which can be removed with a regular screw, the fuel pump cover is secured with one wide screw.
Homemade 136 Husqvarna fuel adjustment tool
Below is a video that will make it clear how exactly you can repair the carburetor without contacting a Husqvarna service center.
Nuances of adjustment
After making the adjustment, the chainsaw should easily pick up and drop speed, work stably at low and high speeds. If the saw chain rotates at idle speed after adjusting the carburetor control screws, this is a sign that the adjustment has been made incorrectly and it is necessary to correct the position of the screw (T).
Also, when adjusting the Husqvarna carburetor, it is worth considering the response time of the chainsaw to the rotation of the screws. The settings do not change immediately, but within five, ten seconds.
One of the indicators of an incorrect adjustment is a strong smoke during the operation of the saw, which indicates a large amount of fuel entering the combustion chamber. If such a situation arises, you need to correct the position of the screw (L).
Factory settings
The factory default setting for the Husqvarna carburettor is the position of the screws (H) and (L), in which a working chain saw is guaranteed to start. For Husqvarna tools, this is one and a half turns from fully tightened screws (H) and (L).
In the process of adjustment, you must first set the screws to the standard position, then start the chainsaw and make precise adjustments to the power, the number of maximum revolutions and idle speed..
Algorithm and description of setting the carburetor Husqvarna
Husqvarna carburetor, adjustable in the same way as carburetor settings on other brands of chainsaws.
Immediately before adjusting, it is necessary to carry out a complete diagnosis of the saw and make sure that there is no obstruction of the fuel supply and air leakage into the crankcase of the chainsaw. It is also necessary to make sure that the air filter is clean and, if necessary, replace it with a new one..
The order of work:
- Saw muffled with Husqvarna carburetor factory setting.
- The engine starts and the saw warms up for a few minutes.
- By turning the screw (L) clockwise, the position is found at which the engine develops maximum speed, after which the screw must be unscrewed 1⁄4 back. If at the same time the chain of the chainsaw rotates, then it is necessary to reduce the idle speed by adjusting the position of the screw (T).
- The next stage is adjusting the power of Husqvarna at maximum speed and adjusting their number. To do this, the tachometer is connected to a running chainsaw, the throttle stick is squeezed out to full, after which the tachometer readings are checked. If the value of the maximum revolutions differs from the maximum number recommended by the manufacturer, then by changing the position of the screw (H), the tachometer readings are returned to normal.
The structure and principle of operation of the Husqvarna carburetor
To successfully tune your Husqvarna chainsaw carburetor, you need to know how it works and how it works. In fact, everything is not as difficult as it seems at first glance..
The saw carburetor has a built-in fuel pump, which is responsible for transporting a mixture of gasoline and oil, as well as a diaphragm, a needle valve with a rocker arm. Their joint work allows metering the fuel supply to the main chamber and two dampers..
One of the valves is designed to adjust the fuel supply to the cylinder when the gas is pressed, it is called the throttle, the second is responsible for restricting the air supply from the air filter to facilitate starting a cold Husqvarna chainsaw.
At the moment when the operator cuts off the air supply to the carburetor with the help of the air damper, the fuel mixture becomes leaner and its supply to the cylinder increases, due to which the chainsaw starts much easier than when a cold start is carried out in normal mode..
In the operation of the Husqvarna carburetor, a nozzle valve is involved, which atomizes the fuel and prevents air from entering the main chamber. Often, problems during the operation of the saw can be caused by defects of this particular element..
For example, a valve, if the chainsaw is not stored properly, may stick, the fuel supply will stop, which will make the engine impossible to operate. Also, irregularities in the operation of the injector can cause air to leak into the main fuel chamber of the carburetor. In such cases, adjusting the position of the adjusting screws will not correct the situation, it will be necessary to repair or replace the unit..
Three adjusting screws installed in the carburetor body are responsible for setting the quality and quantity of the mixture, as well as the number of revolutions of the crankshaft in idle mode:
- screw (L) – adjusts the amount of fuel at low and medium speed;
- (H) – is responsible for traction at high speeds and their number;
- (T) – changes the position of the throttle valve, thereby regulating the amount of fuel mixture entering the cylinder and the operation of the engine of the tool in idle mode.
Attention! Screws (L) and (H) cannot be adjusted without specific knowledge and experience. Improper adjustment of the quality and amount of the fuel mixture can cause the engine to stop working or malfunction, leading to rapid wear or even seizure..
Adjusting the carburetor of a Husqvarna chainsaw
Modern chainsaws have a complex system and consist of several main units that periodically require maintenance and adjustment. In this article, we’ll talk about how to adjust the carburetor on a Husqvarna chainsaw..
- When does the carburetor of a Husqvarna chainsaw need adjustment?
- The structure and principle of operation of the Husqvarna carburetor
- Tools required for work
- Algorithm and description of setting the carburetor Husqvarna
- Nuances of adjustment
- Factory settings
- DIY carburetor repair
- Output
Tools required for work
Before proceeding with the tuning of the Husqvarna carburetor, you need to take care of having all the tools that may come in handy. To carry out this type of work yourself, you will need:
A regular slotted screwdriver will not work for adjustment, as the adjusting screws on Husqvarna chainsaws may have different cross-sections. You will have to purchase a special, this is a feature of repairing Husqvarna chainsaws, they did everything so that the saw could be repaired only in a specialized Husqvarna service.
Algorithm and description of setting the carburetor Husqvarna
Husqvarna carburetor, adjustable in the same way as carburetor settings on other brands of chainsaws.
Immediately before adjusting, it is necessary to carry out a complete diagnosis of the saw and make sure that there is no obstruction of the fuel supply and air leakage into the crankcase of the chainsaw. It is also necessary to make sure that the air filter is clean and, if necessary, replace it with a new one..
The order of work:
- Saw muffled with Husqvarna carburetor factory setting.
- The engine starts and the saw warms up for a few minutes.
- By turning the screw (L) clockwise, the position is found at which the engine develops maximum speed, after which the screw must be unscrewed 1⁄4 back. If at the same time the chain of the chainsaw rotates, then it is necessary to reduce the idle speed by adjusting the position of the screw (T).
- The next stage is adjusting the power of Husqvarna at maximum speed and adjusting their number. To do this, the tachometer is connected to a running chainsaw, the throttle stick is squeezed out to full, after which the tachometer readings are checked. If the value of the maximum revolutions differs from the maximum number recommended by the manufacturer, then by changing the position of the screw (H), the tachometer readings are returned to normal.
Factory settings
The factory default setting for the Husqvarna carburettor is the position of the screws (H) and (L), in which a working chain saw is guaranteed to start. For Husqvarna tools, this is one and a half turns from fully tightened screws (H) and (L).
In the process of adjustment, you must first set the screws to the standard position, then start the chainsaw and make precise adjustments to the power, the number of maximum revolutions and idle speed..
DIY carburetor repair
If in the process of carrying out a full diagnosis of the Husqvarna chainsaw, carburetor defects were found, then some of them can be repaired without contacting a Husqvarna AB service center. For example, you can independently:
- change the gaskets under the covers of the main chamber and the fuel pump;
- clean or replace the strainer;
- replace the diaphragm or needle valve of the main chamber;
- troubleshoot the fuel pump diaphragm.
Gaskets, diaphragms and a rocker needle valve can be found in the repair kit provided for each Husqvarna chainsaw carburetor model..
Also, if you have some experience, you can try to restore the faulty injector valve, but you cannot guarantee a positive result when you try to restore the injector, if it is faulty, the manufacturers recommend changing the carburetor completely. To do this, you need to perform the following series of actions:
- Before removing the carburetor, clean the saw with a compressor, as dirt can interfere with a quality repair.
- Next, open the top cover of the chainsaw, remove the air filter, disconnect the rods from the air and throttle control levers.
- After that, unscrew the screws securing the carburetor.
- Disassemble the carburetor body for repair. This is quite simple to do. The main chamber cover is held in place by four screws, which can be removed with a regular screw, the fuel pump cover is secured with one wide screw.
Below is a video that will make it clear how exactly you can repair the carburetor without contacting a Husqvarna service center.
Nuances of adjustment
After making the adjustment, the chainsaw should easily pick up and drop speed, work stably at low and high speeds. If the saw chain rotates at idle speed after adjusting the carburetor control screws, this is a sign that the adjustment has been made incorrectly and it is necessary to correct the position of the screw (T).
Also, when adjusting the Husqvarna carburetor, it is worth considering the response time of the chainsaw to the rotation of the screws. The settings do not change immediately, but within five, ten seconds.
One of the indicators of an incorrect adjustment is a strong smoke during the operation of the saw, which indicates a large amount of fuel entering the combustion chamber. If such a situation arises, you need to correct the position of the screw (L).