How to adjust the carburetor of the chausopila Husqvarna. Husqvarna 137 chainsaw carburetor adjustment

Husqvarna chainsaw carburetor adjustment

The company under the title “Husqvarna” was based in 1687. “Husqvarna” (Husqvarna) is a favorite in the market of industrial and garden equipment. Enters the Swedish concern that unites several companies within himself. Producing different types of equipment, ranging from small.Sized sewing machines to impressive ATVs.

Husqvarna offers its customers a very expanded assortment of special equipment and equipment. In recent years, the company has grown the number of patented innovations. “Husqvarna” is firmly on guard of progress.

The manufactured products of this brand turns hard work into a normal lesson, which does not harm a person or the environment.

Husqvarna 137 chainsaw belongs to the technique manufactured under the category of “forest professionals”. Together with this model, the manufacturer also produces universal security chainsaws, blizzards and altitude cutters. All manufactured technology has small sizes and convenience of control. All Husqvarna chainsaws are distinguished by three features. The ability to absorb excessive vibrations, an improved air filtration system, the highest power.

Technical characteristics of the chainsaw Husqvarna 240

The basis of the Husqvarna 240 saw is a 2-stroke engine with a carburetor. Works on gasoline-oil mixture. Motor resource is increased due to the improvements of a crooked-shaped node and a special cylinder coating. Fuel savings are reduced by 20% due to the innovative X-TorQ system, which also reduces the harmfulness of exhaust exhaust gases. A spacious fuel tank and a small fuel consumption extend the tool time, without a break for refueling.

Otherwise, the saw has the following technical characteristics:

  • Productivity. 2 l. With.;
  • Chain step. 3/8 inches;
  • The capacity of the fuel tank is 300 ml;
  • Oil tank. 200 ml;
  • Tire length. 40 cm;
  • Weight. 4.7 kg.

When you need adjustment

The need to set up a chainsaw carburetor rarely occurs. Often there are problems with the intake of fuel, air or wear of parts. But sometimes adjustment is still required:

  • The started engine stalls after a few seconds, or does not start. The reason for this is too rich the mixture;
  • Excessive exhaust, high speed, increased consumption. In this case, on the contrary, the mixture is too poor, t. E. Not enough air;
  • The revolutions are kept at the same level after they reduce or increase the operator. The cause may be a stabbed needle valve.

Factors leading to such changes can be as follows:

  • Strong vibration damages the protective cover, and adjusting nozzles are removed, changing the setting. In this case, it is possible to adjust the carburetor on the chainsaw.
  • Wear of the elements of the piston system. Setting up a carburetor in such a situation may provide temporary assistance. It is recommended to replace worn components.
  • Low.Quality fuel, faulty filter or long storage can cause blockages. In this situation, the carburetor must be removed, washed with special liquid or clean gasoline, assembled and regulate again.

It is best to start setting the work of a saw from checking the jetgles, supplying fuel and air. After that, proceed to the dismantling of the carburetor, and then to check the piston system.

When you need adjustment

The need to set up a chainsaw carburetor rarely occurs. Often there are problems with the intake of fuel, air or wear of parts. But sometimes adjustment is still required:

  • The started engine stalls after a few seconds, or does not start. The reason for this is too rich the mixture;
  • Excessive exhaust, high speed, increased consumption. In this case, on the contrary, the mixture is too poor, t. E. Not enough air;
  • The revolutions are kept at the same level after they reduce or increase the operator. The cause may be a stabbed needle valve.

Factors leading to such changes can be as follows:

  • Strong vibration damages the protective cover, and adjusting nozzles are removed, changing the setting. In this case, it is possible to adjust the carburetor on the chainsaw.
  • Wear of the elements of the piston system. Setting up a carburetor in such a situation may provide temporary assistance. It is recommended to replace worn components.
  • Low.Quality fuel, faulty filter or long storage can cause blockages. In this situation, the carburetor must be removed, washed with special liquid or clean gasoline, assembled and regulate again.

It is best to start setting the work of a saw from checking the jetgles, supplying fuel and air. After that, proceed to the dismantling of the carburetor, and then to check the piston system.

DIY carburetor repair

If, in the process of complete diagnosis of the Husqvarna chainsaw, carburetor defects were found, then some of them can be eliminated without contacting the Husqvarna AB service center. For example, you can yourself:

  • Change the gaskets under the lids of the main camera and the fuel pump;
  • Clean or replace the mesh filter;
  • Replace the diaphragm or needle valve of the main chamber;
  • Eliminate the fuel pump diaphragm malfunctions.

Gaskets, diaphragms and a needle.Shaped valve with a rocker, can be found in the remote complex, which is available for each model of carburetors of the chainsawsopil of Husqvarna.

Also, in the presence of a certain experience, you can try to restore a faulty Form valve, but it is impossible to guarantee a positive result when trying to restore the nozzle, with its malfunction, manufacturers recommend changing the carburetor completely.

How the Husqvarna chainsaw carburetor works

The principle of operation of the WALBRO carburetor is based on such a physical process as air vacuum. In fact, the membrane carburetor performs the function of the fuel pump to pump fuel into it. Since the gas tank in the Husqvarna 365 chainsaw is below the level of the carburetor, the fuel cannot be received by gravity (like in chainsaws with carburetors of the float type).

When the piston moves down in a crooked-shaped chamber, air release occurs. From the crank chamber to the pulse camera of the carburetor through a special fitting under pressure is alternating air supply, which raises the membrane. When creating a vacuum for pressure from the membrane, the valve open and close, due to which fuel and enters the carburetor. Passing the inlet valve, fuel passes through the filtering element and reaches the needle in a purified form.

545 RX Husqvarna первый некомерческий покос после настройки карбюратора в сервис центре. 20.05.2022

In order for the fuel to fall into the main chamber, you need to lower the needle, for the movement of which another membrane (control) is used). When the membrane moves up, it affects the stem, and through the butterfly the needle moves down (fuel enters the chamber). The movement of the control membrane is promoted by the release in the chamber that occurs when the piston moves up and down. That is why, when the engine is cold, it should be pumped several times by the starter.

From the main chamber, fuel enters the working area. Here, with the help of a diffuser, the fuel with air is mixed. Then the finished mixture enters the engine combustion chamber.

The advantages and disadvantages of the cutting device

For this, 3 adjusting jet of the device provides for the device design. Cooper adjustment screw (t) is located at the top of the carburetor. Below there are a pair of jackets for adjusting the supply of fuel on minimum (l) and maximum (h) revolutions, left and right, respectively.

How To Actually Tune A Chainsaw!

The procedure for adjusting the carburetor on the Husqvarna chainsaw is as follows:

  • Warm up for 5 minutes.
  • Turning the screw L, bring the engine to the highest revolutions in an unloaded state and return it back to a quarter of turnover.
  • With one hand, hold the gas button for 15 seconds. At this time, the nozzle h Twist to the right to stop and achieve maximum speed. Then we turn it back for one and a half turns or until the “screech” of the engine disappears.
  • Having released the gas, we turn the idle screw (t) clockwise until the chain starts to move. After that, we rotate it in the opposite direction until the movement of the chain is stopped.

In the process of adjustment, a situation may arise in which the chainsaw is stalled. This can be due to overly unscrewed jacklers, too rich or poor mixture.

If this happens, it is necessary to tighten the jetlaws of minimum and maximum revolutions to the stop. Then unscrew them back and a half turning and try to start the saw.

Ignition setting after adjusting the carburetor

If the cleaning and setting up the carburetor did not correct the existing problem, you need to check the candle and configure the engine. It is worth acting in the following order:

  • A candle is removed and a visual inspection is carried out. If it is dry with a light brown soot, it can be considered good.
  • In case of detection of traces of gasoline on the candle, re.Adjusting the carburetor should be re.Adjusted. This is because it supplies an excessive amount of fuel in the internal combustion engine, filling it.
  • If the candle looks normal, check the operation of electrical equipment. First of all, a cable supplies to a candle. Its end is brought a short distance to the lattice of the cylinder radiator and a starter is scrolled with a cord. The spark should slip. If it is not, the cable is checked by the tester and, if necessary, replace.
  • If the cable is in good condition, the ignition coil is tested. If the inspection has not identified soldered or torn wires, the coil is nicknamed the tester, comparing the data with the accompanying documentation. If deviations are detected, the block must be replaced with similar.

After replacing the coil block, you should set a gap in Magneto. The gap between the ignition coil and the flywheel should be from 0.2 to 0.4 mm. To put a gap, you need a set of probes or you can use foil of suitable thickness. The probe is clamped between the coil and the flywheel at the time of installation, after which it is pulled out.

DIY carburetor adjustment on a chainsaw

Adjusting the gasopyle carburetor provides efficient operation of the tool at full power with economical fuel consumption. Adjustment should be carried out with a pure fuel and air filter. For a larger number of carburetors, adjustment is carried out by three screws: for maximum and minimum revolutions and idle adjustment.

The screws H and L regulate the ratio of a mixture of gasoline and air determined by the opening of the throttle valve of the carburetor. When the screws are unscrewed, the mixture is enriched, and the revolutions, accordingly, fall, when twisting, the mixture is lunch. The revolutions grow.

The designation H belongs to the screw of the maximum turnover, the controller of the main nozzle, L. To the screw of the minimum turnover, which controls the nozzle nozzle. Using the screw S, the accurate adjustment of the idle speed is carried out. Sometimes, to simplify the settings, the number of available adjusting screws of the carburetor reduce.

The tuning of the carburetor of the chainsaw is divided into two stages. The base (factory settings), carried out with the engine turned off. And final, produced on a working heated engine. The exact value of the rotation angles should be taken from operating instructions for a particular chainsaw. If the manufacturer is not observed, can lead to engine damage.

The adjusting screws of the maximum H and minimal l rpm are slowly rotated clockwise until it stops, after which they turn back 2 turns, other settings are also possible

We look for the highest idle speed, for this we slowly turn the screw l in different directions. After finding the position of the highest engine speed, it is necessary to turn the screw L to 1/4 turnover counterclockwise. If the chain rotates at the same time, the screw T or (s) should be turned to forgive the clockwise until it stops.

Checking and adjusting the maximum speed.

Changing the maximum speed is carried out by a screw H. When wrapping it (rotation clockwise), the turns increase, when turning out. Decrease. Chainsaw engines have the highest rotation speed from 11500 RID/min. Up to 15000 rpm. Higher speed does not provide ignition, in addition, it becomes dangerous for the engine. The limiting turns can be determined by interruptions in the ignition. If they come, the screw H is slightly turning counterclockwise.

If the engine operation is not checked for accelerations and maximum speed, then adjusting the chainsaws cannot be considered completed.

With a smooth press on the gas trigger, the engine should confidently and quickly gain momentum from the idle to maximum (from 2800 OBR.Up to 11500-15000 arr. Depending on the unit). If the revolutions are gained slowly, with delay, the screw L needs to slowly turn counterclockwise, but not more than 1/8 turnover.

After adjusting the acceleration and maximum speed, you should again check the operation of the saw at idle. The engine should work stable, the circuit should not move. The setup of the chainsaw should be repeated if this condition is not fulfilled, but with the exception of the stage of the basic adjustment.

Tools you need to work

Before setting up the Husqvarna carburetor, you need to make sure that you have all the necessary tools. To do such work yourself, you will need:

The usual slotted screwdriver is not suitable for adjustment, since the adjusting screws on the Huskvarn chainsaws can have various transverse sections. They will have to buy a special one, this is the Huskvarn chainsaw repair function, they did everything so that the saw repair was carried out only in the specialized service of Husqvarna.

Algorithm and description of the carburetor Husqvarna

Husqvarna carburetor is regulated similarly to the regulation of carburetors on the chainsaws of other manufacturers.

Immediately before adjustment, it is necessary to perform a complete diagnosis of the saw and make sure that there are no problems with the supply of fuel and air to the crankcase. You must also make sure that the air filter is clean and replace it with a new.

  • Husqvarne carburetor factory settings are configured for muffled dust.
  • The engine starts and the saw heats up within a few minutes.
  • Rotation of the screw (l) clockwise leads to a position in which the engine develops maximum speed, after which the screw must be turned by 1-4. If the chain of the chainsaw rotates, it is necessary to reduce the rate of idle, adjusting the position of the screw (t).
  • The next step will be the Husqvarna power adjustment at maximum speed and setting the number. To do this, the tachometer is connected to the wound chainsaw, the throttle is compressed to failure, and then the tachometer readings are checked. If the maximum speed value differs from the maximum number recommended by the manufacturer, then the testimony of the tachometer will be normalized by changing the position of the screw (h).

The nuances of adjustment

After adjusting the chainsaws should easily gain and lose speed, work stably at low and high speeds. If, after adjusting the carburetor control screws, the saw circuit operates at idle, this indicates the wrong settings and the need to adjust the screw position (t).

In addition, when adjusting the Husqvarne carburetor, the time reaction time to rotation of the screws should be taken into account. The settings do not change immediately, but after five, ten seconds.

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