adjusting screwdriver for Husqvarna 240 carburetor

In what cases does the carburetor of a Husqvarna chainsaw require adjustment?

There are a lot of problems that can be solved by adjusting the carburetor. Adjusting the carburetor of the Husqvarna chainsaw is necessary when malfunctions such as:

• increased idle speed;
• strong smoke when operating the tool;
• difficulty starting a cold or hot engine;
• lack of traction and reduced maximum speed.

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 a major overhaul of the engine or during scheduled maintenance of the chainsaw.

]Husqvarna AB[/anchor] recommends adjusting the carburetor before and after running in the saw.

Initial adjustment and starting to use the saw

Most instruments come pre-configured by manufacturers.

During the running-in process, the correct operation is checked:

1. When starting up for the first time, you need to ensure that the chainsaw operates in a gentle mode. A few hours after the start, it is recommended to cut small branches and trunks up to 10 cm thick.
2. The chainsaw must start correctly, ensure a stable rotation speed of the sprocket and a smooth increase and decrease in power.
3. Fuel consumption must correspond to the power used and in practice the saw should not go out, “sneeze”, smoke or run jerkily.
4. There should be no extraneous knocks, pops or noises when the engine is running.

The following rules will help you stay safe:

1. Mix gasoline and oil in accordance with the proportions specified by the manufacturers.
2. Do not prepare the mixture in advance. The properties of gasoline and oil in a mixed state change over time. The exception is fuel for intensively used tools, however, even here the norm of 7 days should not be exceeded.
3. Use oil designed for the chainsaw brand engine. A fuel mixture with a non-standard composition will damage it.
4. When preparing the fuel mixture, take into account the influence of climatic conditions on the components.

The design and principle of operation of the Husqvarna carburetor

To successfully configure the Husqvarna chainsaw carburetor, you need to know its structure and understand how it works. In fact, everything is not as complicated as it seems at first glance.

The saw carburetor has a built-in fuel pump, which is responsible for transporting the mixture of gasoline and oil, as well as a diaphragm, a needle valve with a rocker arm. Their joint work makes it possible to dose the fuel supply to the main chamber and two dampers.

One of the dampers is designed to regulate the flow of fuel into the cylinder when you press the gas, it is called the throttle, the second is responsible for limiting the flow of air from the air filter to facilitate starting a cold Husqvarna chainsaw.

At the moment when the operator shuts off the air supply to the carburetor using 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.

The operation of the Husqvarna carburetor involves a valve-nozzle, which atomizes fuel and prevents air from entering the main chamber. Often problems with saw operation can be caused by defects in this particular element.

For example, if the chainsaw is stored improperly, the valve may stick, the fuel supply will stop, which will make the engine impossible to operate. Also, malfunctions in the operation of the nozzle 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; repair or replacement of the unit will be required.

Three adjusting screws installed in the carburetor body are responsible for adjusting the quality and quantity of the mixture, as well as the number of crankshaft revolutions in idle mode:

• screw (L) – regulates the amount of fuel in low and medium speed modes;
• (H) – 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 tool engine in idle mode.

Attention! Screws (L) and (H) cannot be adjusted without specific knowledge and experience. Incorrect adjustment of the quality and quantity of the fuel mixture can cause the engine to stop working or operate incorrectly, causing it to wear out quickly or even seize.

Main cause of failure

During the sawing process, a large amount of small sawdust is formed, a very small amount of which still gets into the carburetor and clogs its channels and the fuel grid in it. Over time, this leads to unstable operation:

• Power reduction;
• Unstable operation - floating speed;

If the chainsaw stalls under load, then most likely this is also due to a clogged carburetor.

On a note! Many people will notice how sawdust can get into the carburetor if the saw has an air filter designed to prevent it from getting in. The answer is simple - this filter, due to its design, is not intended to filter very small particles.

If you have encountered such problems, then the first thing you need to do is remove the chainsaw carburetor, disassemble it and wash its parts in gasoline. After this you need to move on to configuration. In order to remove, you need to dismantle the top cover, remove the spark plug wire and unscrew the 2 mounting bolts. Read about what gasoline to use in a chainsaw here.

After washing, you can’t just start the saw ; to do this, you need to perform a certain series of actions, set the adjusting screws to the original “working” position:

1. Screw in screw H until it stops and then back out 1.5 turns.
2. Screw screw L until it stops, and then turn it out 2.5 turns.
3. Start the saw and warm it up for 3 minutes.
4. Now we move on to adjusting the carburetor, which consists of 2 stages.

Attention! Any carburetor adjustment should be made only with a warm engine. Those. Before the process itself, you must start the saw and warm it up at low and medium speeds for 2-3 minutes, and only after that you can start setting up a stable idle speed.

Tools required for work

Before you start setting up the Husqvarna carburetor, you need to make sure you have all the tools that may be useful. To carry out this type of work yourself, you will need:

• screwdriver for adjusting screws (H) and (L), in specialized stores they have very high prices, so we recommend buying such screwdrivers as a set from Aliexpress; in our service we use such a set;

• electronic tachometer to determine crankshaft speed readings (with some experience, you can adjust by ear), in our tool repair service we use a high-quality and inexpensive analogue, which can be ordered on aliexpress using this link;

• Phillips screwdriver , for adjusting screw (T);
• compressor with a blow gun for cleaning the saw before work.

A regular slotted screwdriver will not work for adjustment , since the adjustment screws on Husqvarna chainsaws can have a different cross-section. You will have to purchase a special one, this is a feature of repairing Husqvarna chainsaws; they did everything so that the saw could be repaired only in a specialized Husqvarna service center.

Conclusion

The work of adjusting or repairing the carburetor on Husqvarna chainsaws can be done without any specific experience. In order to do everything correctly, you must follow the algorithm and have a minimum set of tools. It’s also worth assessing your strengths in advance and not taking risks if you don’t understand anything at all about technology. Believe me, sometimes it is better to pay a small amount to the master than to ruin the instrument by adjusting it yourself.

Why do you need to adjust the Husqvarna carburetor

The carburetor is one of the fundamental mechanical components that make up a chainsaw . Its tasks are to mix fuel with air and supply the resulting composition to the engine. But during the operation of the chainsaw, situations arise when adjusting the Husqvarna carburetor becomes necessary. Chainsaw Husqvarna 135 (Husqvarna 135), Carburetor adjustment ensures correct. Depending on the reasons, of the chainsaw model 142 and other series is adjusted

• the presence of interruptions in the operation of the motor, accompanied by its shutdown;
• excessive fuel consumption during operation.

Since the carburetor affects the quality of the fuel, in the first case, the need to adjust the carburetor of the saw 137 or other professional series, such as Husqvarna 240 or 260, implies an influence on the sufficient amount of combustible raw material entering the carburetor for mixing with the air mass. It is known that maximum performance is possible only with a certain ratio of these substances. Adjusting the carburetor of the chainsaw should I have a Chinese Husqvarna I give on. The second point in adjusting the carburetor mixer of a chainsaw is caused by a lack of incoming air, which causes the injected gasoline to fail to burn and be released in the form of thick smoke. A timely change of parameters with your own hands to reduce the amount of injected fuel will allow you to significantly faster reduce the consumption of this product.

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Do-it-yourself repairs will save not only the budget, but also the time spent on transportation and queues in the workshop. The same applies to replacing various spare parts in gas-powered tools, such as a chain for a chainsaw or a universal trimmer head for a brush cutter, or oils for electric drive products.

Algorithm and description of Husqvarna carburetor settings

The Husqvarna carburetor is adjusted in the same way as carburetors on chainsaws from other manufacturers are adjusted.

Immediately before adjustment, it is necessary to conduct a complete diagnosis of the saw and make sure that there is no difficulty in supplying fuel or air leaks into the crankcase of the chainsaw . You also need to make sure that the air filter is clean and, if necessary, replace it with a new one.

Work order:

1. On the muffled saw, the factory settings of the Husqvarna carburetor are installed.
2. The engine starts and the saw warms up for several minutes.
3. By turning the screw (L) clockwise, the position at which the engine develops maximum speed is found, after which the screw must be turned back 1⁄4. If the chainsaw chain rotates, then it is necessary to reduce the idle speed by adjusting the position of the screw (T).
4. The next stage is adjusting Husqvarna's power at maximum speed and adjusting its quantity. To do this, the tachometer is connected to a running chainsaw, the throttle is squeezed to full, after which the tachometer readings are checked. If the maximum speed value 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.

Lightweight brushcutter Husqvarna 323R. Description, characteristics, videos and owner reviews

The 323R outperforms most budget Husqvarna lawn mowers in terms of engine power. It is increased to 1.2 hp.

Husqvarna 323R is used to maintain clean park areas, private lawns and golf courses.

Both a trimmer head and special knives can be used as a cutting tool.

The trimmer gearbox is able to withstand heavy loads and carry out work for a long period of time.

Basic equipment

The lawn mower is supplied to new customers with the following kit: a trimmer, blades, a bar, a mounting belt, an instruction manual and a small set of maintenance tools.

Specifications

Device

• The length of the handle of the Husqvarna 323R lawn mower is adjustable for maximum comfort during work.
• The belt is made of composite materials and evenly distributes the load along the spine.
• Easy start of the car is ensured thanks to the fuel pumping system.

Smart Start® Combination Guard

Features of application

Before you start working on the Husqvarna 323R lawn mower, you must inspect it for wear or abnormal position of parts, and also check for the presence of the fuel mixture.

When mowing the grass, you need to be careful because the blades rotate at high speed and there is a possibility of stones and other hard objects flying out.

When operating the mower, it is recommended to wear a protective suit and goggles.

Nuances of adjustment

After the adjustment, the chainsaw should easily pick up and drop speed, and operate 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 was made incorrectly and the position of the screw (T) needs to be adjusted.

Also, when adjusting the Husqvarna carburetor, it is worth taking into account the response time of the chainsaw to the rotation of the screws. The settings do not change immediately, but within five or ten seconds.

One of the indicators of incorrect adjustment is heavy smoking when the saw is operating, which indicates a large amount of fuel entering the combustion chamber. If such a situation occurs, the position of the screw (L) must be adjusted.

Husqvarna 135 chainsaw device

The design and configuration of the chainsaw is typical for most types of saws, including those from other manufacturers. The parts of the unit are 99% interchangeable; when selecting and ordering, you can use spare parts from many other Husqvarna chainsaws, in particular those suitable for models 140, 435, 440. In most cases, unless otherwise stated, parts suitable for these saws will be available also use on model 135.

Some changes and features of the device can be clarified by the markings. The letter “E” following the numbers in the model name means a starter with an additional spring and with 4 “legs” instead of two in the basic modifications of the models. In addition, these models do not require the use of a special tool to tension the chain; the chain can be replaced without a tool. All basic models differ from modified ones in that to replace and tension the chain you must use the included slotted screwdriver.

Factory settings

The standard factory settings for the Husqvarna carburetor are the position of the screws (H) and (L), in which a working chainsaw should be guaranteed to start. For Husqvarna instruments, this is one and a half turns from fully tightened screws (H) and (L).

During the adjustment process, 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.

Chainsaw chain

The advantage of these chainsaw models is the standard parameters of chainsaw chains. Almost any chain with a bar length (40 centimeters in general) with a groove width of 1.3 millimeters will do, the chain pitch depends on the model. For those starting with “1” - 3/8″ - which is true for model 135, for analogues starting with “4” - 0.325″.

In any case, you can use any chains for a chainsaw; it is only important to monitor its tension. To adjust the chain tension, you should use an adjusting screw and the rule is that the chain should not sag on the bar, sit quite firmly, but at the same time should not interfere with the rotation of the sprocket; when turned off, the chain should easily scroll along the chainsaw bar by hand.

An important feature when adjusting is that during operation the chain stretches slightly, so it is necessary to periodically check its tension. Correct adjustment will be in increments of 1/4 turn of the adjusting screw.

DIY carburetor repair

If, during a full diagnosis of the Husqvarna chainsaw, carburetor defects were discovered, some of them can be eliminated without contacting the Husqvarna AB service center. For example, you can do this yourself:

• change the gaskets under the covers of the main chamber and 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 needle valve with a rocker arm can be found in the repair kit, which is available for each model of Husqvarna chainsaw carburetors.

Also, if you have some experience, you can try to restore a faulty injector valve , but you cannot guarantee a positive result when trying to restore an injector; if it malfunctions, manufacturers recommend replacing the carburetor completely. To do this, you need to perform the following series of actions:

1. Before removing the carburetor, clean the saw with a compressor, as dirt can interfere with quality repairs.
2. Next, open the top cover of the chainsaw, remove the air filter, disconnect the rods from the air and throttle valve control levers.
3. After this, unscrew the carburetor mounting screws.
4. Disassemble the carburetor body for repairs. Doing this is quite simple. The main chamber cover is held in place by four screws, which can be removed using a regular screwdriver; the fuel pump cover is secured with one wide screw.

Below is a video, after watching which you will understand exactly how you can repair the carburetor without contacting a Husqvarna service center.

Advantages and disadvantages

The quality and reliability of the Husqvarna 340 chainsaw, as well as a long two-year warranty, are noted by a large number of positive consumer reviews.

• First of all, it is affordable. Despite the high level of modernization, the actual price of the model has increased slightly.
• Installing an automatic carburetor helps stabilize traction characteristics, regardless of temperature, load and other external operational factors.
• There is a fairly wide assortment of spare parts that are unified with the same type of models, allowing you to carry out simple chainsaw repairs with your own hands with the proper quality. Thus, it is possible to reduce the time of forced repair downtime to a minimum.

Many users consider the disadvantages to be the high cost of branded consumables and the need for complex repairs in service centers.

In a number of cases, service specialists practice replacing worn-out branded parts with cheap Chinese analogues, without agreement with the customer. The price range of Chinese-made spare parts is lower, but their quality is still insufficient.

During self-repair, many problems are created by the chain drive drive sprocket, to replace which you have to completely dismantle the entire clutch assembly. The instructions contain incomplete information on setting up fuel equipment.

Video: 340th in action

Unfortunately, the Husqvarna model 340 chainsaw has been discontinued, so offers for the sale of new tools are extremely rare. The last recorded price of this model is within 14,500 rubles.

The branded assortment includes models that are similar in cost and performance parameters, but have increased versatility and improved performance characteristics.

In particular, modern technologies are used for applying wear-resistant protective coatings to the cylinder bore and loaded parts of the crank mechanism.

For this version of the device, the Swedish manufacturer recommends a Husqvarna H30 chain with a drive link thickness of 1.3 mm. The manufacturer recommends that it be sharpened by a specialist. The degree of tension is determined visually. Its adjustment is carried out using a screwdriver with an adjusting screw in increments of ¼ turn to the right or left.

For proper operation of the Husqvarna 137 chainsaw, high-quality carburetor adjustment, tension and sharpening of the chain are important. To adjust the carburetor, you need to turn the screw on it that regulates the idle speed until it stops. Then counterclockwise you need to turn the screw 4.5 turns. In this position, the chain should not rotate while the engine is running. If this is not the case, you need to contact the service center. Each screw adjustment step should be no more than 1/16 of a turn and be accompanied by another performance test.

Reviews of the Husqvarna 135 chainsaw

Reviews of Husqvarna 135 should be divided into two categories. From users and from those who repair them. As for the latter, everything is in order. A large number of spare parts, both original and analogues, good reliability and maintainability (unlike many Chinese “analogs”) make the saw a welcome guest in any workshop. Moreover, she gets there quite rarely. However, it also has disadvantages from a repair point of view. First of all, there are a large number of fragile plastic parts that, if they break, are difficult to replace.

Chainsaw users note ease of use, low weight, a very convenient chain tensioner, and convenient control handles, which, unlike the calm ones, you are not afraid of breaking as advantages.

In total, the sites contain dozens of reviews from Husqvarne 135, but most of them are positive. There are also negative reviews indicating shortcomings. In some cases, the chainsaw quickly broke down before it was even out of warranty. Having a warranty repair or replacement will help save the buyer from negativity in such a situation.