Husqvarna 135 Carburetor Adjustment

Tire and chain

The Husqvarna 136 chainsaw comes with a 33 cm (13 in) bar as standard.

  • Number of links 56;
  • Pitch in inches 0.325;
  • Chain and bar groove thickness 1.3 mm.

For sawing wood with a large cross-section, it is allowed to use tires of a different length, up to 40 cm.

Chainsaw Husqvarna 136. Overview, specifications, carburetor adjustment

Chainsaws Husqvarna 136 were relevant until about 2004. Then they began to be replaced by more modern models of this brand, but the Husqvarna 136 remained both on sale and in operation. Many owners of chainsaws of this model, purchased more than ten ago, still work.

Husqvarna 135 Carburetor Adjustment

Chainsaw purpose

Husqvarna 136 belongs to the class of medium-power chainsaws for domestic use in private backyards and farms. It is used for construction work, harvesting firewood, pruning boughs in gardens, when felling trees up to 40-50 cm in diameter.

Equipment

Chainsaw Husqvarna 136 is sold with a set necessary for work:

  • Tire;
  • Chain;
  • Instructions for work and maintenance;
  • Three-in-one universal wrench for securing the bar, candles and a screwdriver for tightening the chain.

Carburetor adjustment screwdrivers not included.

Carburetor adjustment

The carburetor of the Husqvarna 136 chainsaw has three adjusting screws H, T and L. They are mainly provided for adjusting in the factory during testing and adjusting the finished product. In the course of even many years of operation, these settings do not spontaneously go astray. Many other fuel supply problems can arise:

  • Clogged fuel filter or carburetor jets;
  • The fuel hose is pinched or leaky;
  • Due to wear of the piston system or poor ignition performance, the engine cannot run stably at idle speed, etc.

And then it may mistakenly seem that you need to adjust the carburetor.

This shows how such problems are solved, at the end. A little about adjusting the carburetor on the Husqvarna 136 chainsaw:

In fact, adjustment may be required after repairing the carburetor or to correct idle speed.

Using the L and T screws, the operation of Husqvarna 136 is corrected as follows:

  1. The adjustment is carried out on a warm engine at idle speed;
  2. Screw L is turned in steps of a quarter of a turn counterclockwise and back, by ear “feeling” the maximum idle speed.
  3. When reaching the peak, if the idle is too strong and the chain is spinning, the idle speed is reduced by another screw T. The chain should not spin, the engine should not stall at idle.

Screw H is adjusted by specialists with a tachometer, which determines the ceiling of revolutions specified in the Instructions, provided by the manufacturer.

Specifications

The Husqvarna 136 chainsaw uses less fuel than many similar models from other brands. Reliable, has a long service life, which is typical for all models of chainsaws of this brand.

  • Engine power in kW 1.6;
  • Engine power in hp 2.2;
  • Maximum speed. Up to 13,000 rpm;
  • Combustion chamber volume 36.3 cubic meters cm;
  • Fuel tank capacity 410 ml;
  • Capacity of an oil tank for chain lubrication 200 ml;
  • Weight in ready-to-use condition 4.6 kg.

In the later models of Husqvarna 136 chainsaws, the fuel tank capacity was reduced to 370 ml (by 30 ml), and the oil tank capacity to 190 g (by 10 ml). Perhaps this was due to the economy of the model. One refueling lasts for a long time, and the reduction in volume makes the overall weight lighter.

Does not require a special run-in mode by the user after purchase. It is carried out by the manufacturer himself in the factory, with full control. Along the way, the factory run-in serves as a quality test of products.

Equipped with an oil pump for chain lubrication with automatic feed control. At high speeds, the need for the amount of lubricant increases, and its supply increases due to an increase in engine and pump speed.

Has a stable traction force. Really gives out the power declared in the characteristics of 2.2 hp, despite the fact that the volume of the combustion chamber is slightly less than that of models of similar power from other manufacturers.

It has a high-quality filtering system for the air entering the combustion chamber. This reduces the amount of carbon deposits in the piston system and on the spark plug, extending the life of the engine.

Husqvarna carburetor adjustment algorithm and description

Husqvarna carburetor, adjustable in the same way as carburetor settings on other brands of chainsaws.

The order of work is as follows:

  1. Saw muffled with Husqvarna carburetor factory setting.
  2. The engine starts and the saw warms up for a few minutes.
  3. By turning the screw (L) clockwise, the position is found at which the engine develops maximum speed, after which the screw must be turned back 1⁄4. If at the same time 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 the power of Husqvarna at maximum speed and adjusting their number. To do this, the tachometer is connected to a running chainsaw, the throttle handle 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 its design and understand 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 limiting 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 in the case 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 with saw operation can be caused by defects in this particular element. For example, a valve, if the chainsaw is improperly stored, 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; repairs or replacement of the unit will be required.

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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 in the low and medium speed modes;
  • (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.

Factory settings

The factory default setting for the Husqvarna carburetor 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 idling.

Chainsaw carburetor adjustment

Most chainsaw carburetors have three adjustment screws:

  • L. Jet screw for adjusting low speed
  • H. Jet screw for high speed adjustment
  • Screw. T at Partner and Husqvarna (at Calm LA ). Adjusting the idle speed of the chainsaw

Screws H and L adjust the ratio of the mixture of gasoline and air, determined by opening the throttle valve of the carburetor. When the screws are unscrewed, the mixture is enriched, and the revolutions increase accordingly, when the screws are tightened, the mixture becomes leaner. The revolutions fall.

The screw T (LA) is designed to adjust the idle speed. The basic setting of the chainsaw is made at the factory during the final test. The carburetor is usually adjusted for a richer (than optimal) fuel mixture. The factory setting must be maintained during the first hours of saw operation. Then (optional) a more precise carburetor adjustment is made.

We begin the adjustment by setting the idle speed, for this we turn the screw T (LA) counterclockwise, achieving a complete stop of the chain at stable engine speeds.

For further fine adjustment, you need a tachometer and it is better to entrust it to specialists. Especially since in most cases it may not be needed.

We start setting up the tool with the L screw, then use the H screw and finally the T screw (LA).

We find the highest idle speed, for this we slowly turn the screw L in different directions. After finding the position of the highest engine speed, turn the screw L 1/4 turn counterclockwise. If the chain rotates at idle speed, the screw T should be turned clockwise until it stops.

The screw H adjusts the power and speed. Adjusting the carburetor to a lean mixture leads to excessive speed, overheating of the engine and failure of the piston chainsaw.

We warm up the engine of the chainsaw at idle speed for at least 10 seconds and turn the screw H 1/4 turn counterclockwise. Let the engine run for about 10 seconds. Then we check the maximum engine speed with a tachometer. If the maximum speed does not match the passport, the operation should be repeated. When the mixture is too rich, the muffler starts to smoke, when the saw is too lean, it squeals and overheats.

We finish the adjustment by adjusting the idle speed, as already described above. The idle speed is set correctly if the engine runs smoothly at minimum speed and the chain does not rotate.

The carburetor can be considered adjusted if the engine accelerates quickly and sounds like a four-stroke at full throttle.

The chainsaw is considered by many as the ideal and irreplaceable assistant. After all, with its help, you can perform all the work that the ax previously helped to do, without spending a lot of time and effort. That is why almost every home craftsman has such a tool in his arsenal.

The design of the units under consideration is not so complicated. And this means that every craftsman can repair the tool, taking into account the advice of specialists. We will look at the sequence in which the Husqvarna 236 carburetor is adjusted with our own hands.

Do-it-yourself carburetor adjustment on a chainsaw

Chainsaw carburetor adjustment ensures efficient operation of the tool at full power while saving fuel. Adjustments must be made with a clean fuel and air filter. For a larger number of carburetors, adjustment is carried out with three screws: for maximum and minimum revolutions and idle speed adjustment.

Screws H and L adjust the ratio of the mixture of gasoline and air, determined by opening the throttle valve of the carburetor. When the screws are unscrewed, the mixture is enriched, and the revolutions accordingly fall, when the screws are tightened, the mixture becomes leaner. The revolutions grow.

Designation H refers to the maximum speed screw that controls the main jet, L refers to the minimum speed screw that controls the idle jet. The S screw is used to fine-tune the idle speed. Sometimes, for ease of adjustment, the number of available carburetor adjusting screws is reduced.

Chainsaw carburetor tuning is divided into two stages. Basic (factory settings), carried out with the engine off. And the final one, produced on a running warm engine. The exact value of the angles of rotation should be taken from the operating instructions for the particular chainsaw. Failure to follow the manufacturer’s instructions may result in engine damage.

Basic carburetor adjustment.

The adjusting screws for maximum H and minimum L turns are slowly turned clockwise until they stop, then turned back 2 turns, other settings are also possible

Checking and adjusting idle speed.

We find the highest idle speed, for this we slowly turn the screw L in different directions. After finding the position of the highest engine speed, turn the screw L 1/4 turn counterclockwise. If the chain rotates at idle speed, screw T or (S) should be turned clockwise until it stops.

Checking and adjusting the maximum speed.

The maximum number of revolutions is changed by screw H. When screwing it in (clockwise rotation), the revolutions increase, when turned out, it decreases. Chainsaw engines have the highest rotational speed of 11500 rpm. Up to 15,000 rpm. A higher speed does not provide ignition, moreover, it becomes dangerous for the engine. The speed limit can be determined by the ignition interruptions. If they step, turn the screw H slightly counterclockwise.

If the engine is not checked for acceleration and maximum speed, then the adjustment of the chainsaw cannot be considered complete.

When the throttle trigger is smoothly pressed, the engine should confidently and quickly gain speed from idle to maximum (from 2800 rev. To 11500-15000 rev. Depending on the unit). If revolutions are gained slowly, with a lag, screw L must be slowly unscrewed counterclockwise, but no more than 1/8 of a turn.

After adjusting the acceleration and maximum revolutions, check the saw operation at idle speed again. The engine should run stably, the chain should not move. Chainsaw tuning should be repeated if this condition is not met but with the exception of the basic adjustment stage.

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Step-by-step adjustment

Experts recommend making an independent adjustment of the carburetor in the model in question, adhering to the following plan:

  1. First of all, you need to adjust 1 screw, then proceed to the second and only lastly, do the adjustment of the screw responsible for idling.
  2. Next, you need to determine what are the largest idle speed. To do this, you need to carefully turn 1 screw clockwise. Having found the largest value, the element should be turned ¼ turn counterclockwise. If, during this operation, the chain continues to rotate while idling, the T screw must be slowly turned counterclockwise until the chain stops rotating.
  3. Using the screw H for adjustment, it is realistic to change both the power of the unit and the frequency of its revolutions. However, it should be borne in mind that if the carburetor will work for a long time due to the ordinary mixture and at high speeds, this can cause the chainsaw to fail.
  4. To adjust the screw H, you need to do the following steps:
  • Warm up the engine of the unit for 15-20 seconds by selecting the full speed mode;
  • Turn the H-element counterclockwise by ¼ turn;
  • Leave the engine in working condition for 10-15 seconds;
  • Using a tachometer, analyze what the maximum speed is;
  • If the received data do not coincide with the passport, the process should be repeated again.

The four-stroke sound of the engine will help to understand that the adjustment is made correctly. If the mixture after adjustment is too lean, the unit will make a squealing sound. If the mixture is too saturated, smoke will start to appear from the muffler. If in the arsenal of home craftsmen there is a device called a tachometer, then you can begin to independently adjust the H-screw. Under other circumstances, it is better to seek help from specialists.

  1. After the first elements are adjusted, you can start adjusting the idle screw, performing the operation in the following sequence:
  • After activating the engine, you should carefully start turning the screw T clockwise;
  • It is necessary to turn the element until the unit chain begins to rotate;
  • In the next step, the screw must be turned in the opposite direction to stop the rotating movements of the chain.

To understand that it was possible to correctly set the number of idle revolutions, the uniform operation of the engine, in all directions, with the necessary reserve of revolutions, during the rotation of the chain will help.

To independently understand that the work was done correctly, it will be possible to operate the engine, which should instantly accelerate and emit a four-stroke sound at full throttle. If the unit starts with difficulty, the engine will not be able to accelerate immediately, the first screw should be readjusted again to enrich the lean mixture.

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.

Chainsaw carburetor Husqvarna 137: adjustment

Among the dozens of models of chainsaws, one of the most interesting in its class should be noted. The Husqvarna 137 chainsaw. Its low power and simple characteristics make the model an amateur class, not intended for professional use or frequent work. With a weight of 4.6 kg, the device produces a power of 1.6 kW, therefore it is used in a private area for simple purposes. Cutting knots, branches, preparing firewood, etc.

But in order to keep the chainsaw in good condition, even if it is branded and has low power, you need to service it on time. It is important to monitor indicators such as carburetor performance and chain condition. The carburetor of the Husqvarna 137 chainsaw assumes timely tuning and adjustment of the main indicators. In principle, the procedure is carried out according to standard rules, but the design of the device assumes certain nuances.

Chainsaw adjustment Husqvarna (Husqvarna) 137

To begin with, a Walbro carburetor model WT-660 is installed on the chainsaw. This is a popular model, well-tuned for various settings. Accordingly, three screws are installed in it:

  • Screw T. Is responsible for idling;
  • Screw H. Allows you to adjust high rpm;
  • Screw L. Adjusts low rates.

The process is carried out in the following stages:

  1. We preheat the chainsaw, letting it idle normally, showing the optimal number of revolutions.
  2. First of all, we adjust the L screw (high rpm), looking for the highest value. After that, unscrew the screw a quarter of a turn.
  3. Stage two. We achieve stable operation of the circuit. If, with the above action, the chain continues to rotate, we find the screw T and try to adjust it so that the chain does not spin, working stably at idle.
  4. As soon as the engine is well warmed up, unscrew the H screw by ¼. After a couple of seconds of operation, the motor should run stably.
  5. If there is a squeal in the engine. The mixture is too lean, you will have to unscrew the screw H, if a lot of smoke is formed. An enriched mixture is obtained, we tighten the screw a little.
  6. The final stage is the idle setting. When the engine is running, turn the screw T to the right. It is necessary to achieve such a state in which the Husqvarna 137 chainsaw will work, and the chain will not rotate without gas.

Now you know how to adjust your Husqvarna 137 chainsaw. Please note that each time you adjust the screw, you need to test the resulting operating mode. In some cases, it is possible to achieve correct operation and a good set of revolutions by slightly deviating from the above instructions.

What tool is required

First of all, you need to prepare a tool for adjusting the chainsaw carburetor. You will need a set of screwdrivers and open-end wrenches, a special cleaning compound that dissolves carbon and debris.

Disassembly is best done on a table or workbench. On a part of the table, lay a flap of clean, preferably light and monochromatic fabric, on which the parts to be removed and a container for washing will be laid out. It is optimal if it is an ultrasonic bath.

DIY Husqvarna 135 chainsaw 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. If, nevertheless, you need to spend carburetor adjustment on a Husqvarna 137 saw without the help of others, I will try to describe this process carefully. Also at the bottom of the post I added what is really like adjust the carburetor of the chainsaw at idle.

In the picture above, you see three adjustment screws. They have their own professionalism purpose:

The T screw is needed to adjust the idle speed.

Screw L serves to adjust low rpm.

Screw H regulates the highest rpm.

Adjustment procedure:

At first, with the L screw (rotating it), we are looking for the highest idle speed. If we found them, we need to turn this screw a quarter of a turn against the clock hand. If in this case the chain continues to spin, then by rotating the screw T we achieve its stop.

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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 as a 4-stroke in sound. If a squeal is heard, then the mixture is poor (unscrew the screw), if the enriched mixture smokes (tighten the screw).

After adjusting low and high speeds, we set the idle speed with screw T. This is done as follows:

1.The engine must work

2.4. Turn the screw T clockwise until the chain starts to rotate.

3.Rotate the screw in the other direction until the chain stops.

Nuances of adjustment

After 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 when the saw is running, which indicates a large amount of fuel entering the combustion chamber. If such a situation occurs, you need to correct the position of the screw (L).

How to adjust the carburetor on a chainsaw

Remember that it takes a tachometer and experience to properly adjust your chainsaw carburetor. Therefore, it is better to contact a special service!

Chainsaw carburetor adjustment ensures efficient operation of the tool at a workable power version with economical fuel consumption. Adjustments must be carried out with a clean fuel and air filter. For a larger number of carburetors, the adjustment is carried out with 3 screws: for high and low speed and idle speed adjustment.

Screws H and L adjust the ratio of the consistency of gasoline and air, determined by opening the carburetor throttle valve. When the screws are unscrewed, the consistency is enriched, and the revolutions accordingly fall, when the screws are tightened, the mixture becomes leaner. The revolutions grow.

The designation H refers to the high speed screw that controls the main jet, L. The low speed screw controls the idle jet. With screw S, the idle speed can be precisely adjusted. From time to time, to simplify options, the number of available carburetor adjusting screws is reduced.

Chainsaw carburetor setting is divided into two steps. Basic (factory options), carried out with the engine off. And the final one, produced on a running warm engine. A clear value for the angles of rotation should be taken from the operating instructions for a particular chainsaw. Failure to follow the manufacturer’s instructions will damage the motor.

Basic carburetor adjustment.

The adjusting screws of the highest H and low L turns are slowly turned clockwise in full, then unscrewed back 4.5 turns, other options are also possible

Checking and adjusting idle speed.

We find the largest idle speed, for this purpose we slowly turn the screw L in different directions. After finding the position of high engine speed, turn the screw L 1/4 turn counterclockwise. If the chain rotates at the same time at idle, the screw T on the other (S) should be turned clockwise until it stops.

Checking and adjusting the highest speed.

The change in the maximum number of revolutions is carried out by screw H. When screwing it in (clockwise rotation), the revolutions increase when it is turned out. Decrease. Chainsaw engines have the highest rotational speed from 11500 rpm. Up to 15,000 rpm. Somewhat overspeed is not provided by the ignition; today it becomes unsafe for the engine. Limit turns are determined by misfiring. If they come, screw H is slightly unscrewed counterclockwise.

If the operation of the motor has not been tested at acceleration and at maximum speed, then the adjustment of the chainsaw cannot be considered complete.

With a smooth pressing of the gas trigger, the engine should confidently and rapidly gain momentum from idle to maximum (from 2800 rev. To 11500-15000 rev. Starting from the unit). If the speed is gained slowly, with a delay, screw L must be slowly unscrewed counterclockwise, but less than 1/8 of a turn.

After adjusting the acceleration and the highest speed, the saw should be checked again at idle speed. The engine must run stably, the chain must not move. Chainsaw tuning must be repeated if this condition is not performed, alas, apart from the basic adjustment step.

Most chainsaw carburetors have three adjustment screws:

The chainsaw is an indispensable tool for people living in private households. It is a mechanism consisting of carefully fitted parts and assemblies.

Like any mechanism, it requires periodic maintenance and adjustment. Especially because of low-quality fuel. Consider the principles and procedure for adjusting the carburetor of a Husqvarna chainsaw.

How to understand that everything is done correctly

After setting up, you need to start the chainsaw. Check the stability of idling. In this case, the chain must not move. When you press the accelerator, the chainsaw should accelerate steadily and stop without delay.

At minimum and maximum rpm, the Husqvarna 350 should run stably, free of extraneous noise. At the time of operation, there should be no sharp loss of power or shutdown.

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 adjustment is needed

The need to adjust the carburetor of a chainsaw is rare. often there are problems with the flow of fuel, air or wear of parts. But sometimes adjustment is still required:

  • A running engine stalls after a few seconds, or it does not start. The reason for this is a too rich mixture;
  • Excessive exhaust, high revs, increased consumption. In this case, on the contrary, the mixture is too lean, i.E. There is not enough air;
  • RPM is kept at the same level after its decrease or increase by the operator. The cause may be a stuck needle valve.

The factors leading to such changes can be the following:

  1. Strong vibration damages the protective cover and the adjusting jets are unscrewed, changing the setting. In this case, it is possible to adjust the carburetor on the chainsaw.
  2. Wear of elements of the piston system. Adjusting the carburetor in such a situation can be of temporary help. Replacement of worn out components is recommended.
  3. Poor quality fuel, faulty filter, or long storage can cause blockages. In this situation, the carburetor must be removed, washed with a special liquid or clean gasoline, assembled and re-adjusted.

It is best to start tuning the saw by checking the jets, fuel and air supply. After that, proceed to dismantle the carburetor, and then. To check the piston system.