Chainsaw Carburetor Adjustment Husqvarna 142

What is a factory setting for a Husqvarna chainsaw carburetor?

In order for the chainsaw 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 the second models of this line, I recommend watching this:

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 soot and debris.

Chainsaw Carburetor Adjustment Husqvarna 142

Disassembly is best done on a table or workbench. On a part of the table, lay a flap of clean, preferably light and monochromatic cloth, 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.

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 in partner and Husqvarna (in Stihl 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.

Humidity fine adjustment will 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 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 return the screw L by 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 begin 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.

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Information support

Detailed operating instructions contain information about the features of preparing the saw for work, maintenance, troubleshooting.

Technical and technological features

Higher quality materials are used in the production of the chainsaw range to increase productivity, operational reliability and durability. Also experience of successful implementation of past developments, own design solutions.

Only by purchasing the original, you can be completely confident that the power and other characteristics of the Husqvarna model 142 chainsaw will cope with cross, diagonal or rip sawing of all types of wood species up to 30 cm in diameter.

  • These characteristics determine the suitability of the tool for harvesting wood fuel, cutting up timber, forming crowns of decorative and garden trees.
  • The possibility of using the saw with tires that are smaller and more comfortable for working in inaccessible places determines the suitability of the tool for the construction of wooden structures of special and general purpose.
  • Working with a saw does not ask for professional qualifications, the necessary abilities are rapidly developed in the process of the work itself.

Guaranteed operational safety and easy starting

The risks of injury in the event of an emergency are minimized due to the high-precision operation of the braking device, which is activated when the upper plate is slightly displaced in the frontal direction.

A recoil starter with an easy start system, a booster pump and advanced electronic ignition guarantee a successful start of the power unit in extremely low and high ambient temperatures.

Experts describe the Husqvarna 142 saw as a rather comfortable, productive, reliable and durable household tool that meets the requirements of modern technical and operational standards.

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 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, that is, there is not enough air;
  • Rpm is kept at the same level after its decrease or increase by the operator. a prerequisite may be a stuck needle valve.

The factors leading to such changes can be the following:

  • Strong vibration will damage the protective cover and the adjusting jets are unscrewed, changing the settings. In this case, it is possible to adjust the carburetor on the chainsaw.
  • 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.
  • 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, he proceeds to dismantle the carburetor, and then to check the piston system.

Model advantages

  • The relatively low weight of the Husqvarna 142 chainsaw and the ergonomic design combined with the curved front handle make the equipment very comfortable to operate.
  • Anti-vibration system allows NOT to feel lethargic for a long time.
  • The presence of a shield and a chain brake is foreseen to ensure the safety of users.
  • The power of the Husqvarna 142 chainsaw is increased by means of a forged crankshaft, consisting of 3 sections.

Structural advantages

Low-cost work is facilitated by constant traction properties of the power unit, economical consumption of fuel and consumables. Comfort and safety of the instrument is ensured by the design of the body, comfortable configuration of the handles and balancing.

The list of additional amenities:

  • Easy start system;
  • Effective vibration damper;
  • Access to the tuning points of components and assemblies;
  • Convenient placement of controls;
  • The ability to work with alternative work headsets.

What is responsible for supplying a mixture of fuel and oil

For accurate delivery of fuel with oil, the work 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.

Read more:  How to Replace an Oil Pump On a Stihl Chainsaw

What is a carburetor?

A carburetor is a device that is designed to prepare a combustible mixture of liquid fuel and air, which ensures the operation of carburetor internal combustion engines.

Modern carburettors are equipped with many different devices and systems, which have numerous holes of different calibers, an extensive network of channels, pneumatic chambers and linkages.

The carburetor is one of the main parts of any fuel-powered equipment. To ensure normal and stable operation of equipment, it is necessary to periodically check and, if necessary, adjust the carburetor.

Chainsaw carburetors have three adjustment screws. Screw “L” is designed to regulate low speed, screw “H” is responsible for regulating high speed, and screw “T”. at idle speed of the chainsaw. So, screws “H” and “L” adjust the ratio of the mixture of air and gasoline, when the screws are unscrewed, the speed increases, since the mixture is enriched, and when tightened, the speed falls.
Generator carburetors often have only one adjusting screw, but many other modifications of this part are also possible. Its adjustment allows you to exclude excessive fuel consumption and leakage of unburned oil.

However, there are quite common cases when the adjustment of the carburetor cannot eliminate the malfunction of the equipment. This is due to the final breakdown of the part, which occurs as a result of natural wear and tear or due to improper operation.

A versatile, multi-purpose saw for part-time use. Slim and sleek body, excellent power-to-weight ratio, and some of the best vibration ratings in any dust. The economy pump stops supplying lubricant to the chain when the saw is idling. Easy Start system.New spring-loaded starter mechanism and fuel pump, reducing the number of jerks required to start.

Spiked bumper not included in delivery
characteristics:

Air injection
Air injection Centrifugal air cleaning system for long filter cleaning intervals, smooth operation and reduced wear.
Easier to start
Combined adjuster / stop makes it easy to start the saw.
Ease of operation
Narrow body, high center of gravity and flat bottom make our saws extremely easy to use.
The principle of two masses
Vibration absorption system and handles isolated from the motor by steel springs. Independent anti-vibration system.
Uninterrupted operation
A damping clutch reduces vibration in the carburetor. Ensures trouble-free operation and prolongs service life.
Three-piece crankshaft
Forged three-piece crankshaft designed to maximize service life for the toughest applications.

Best delight
Curved front handle for a better grip and natural working posture.

Economical pump
Economical pump stops lubrication at idle.

Fast acceleration
Light weight of all moving parts of the motor means fast acceleration.

Easy cleaning
Bayonet-mounted air filter for easy filter removal for cleaning.

Safe to use
Double-acting chain brake, right-hand guard and chain stop for increased safety when using the saw.

Do-it-yourself Husqvarna carburetor adjustment?

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 setting 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 possible. Unscrew the screw (T);
  • Compressor with a special gun connected to them. The blowing device will help get rid of excess litter and dirt, since the carburetor must always be clean.

Many Husqvarna chainsaws use a custom cut adjusting bolt. See in advance which ones you have installed and purchase the Corresponding kit. This will help to avoid many difficulties at the initial stage.

Power unit

The saw is equipped with a two-stroke air-cooled carburetor engine with a volume of 40.2 cm3 and a power of 2.6 hp. The power unit is characterized by flexible traction parameters, optimal fuel consumption, easy start, simple maintenance and long overhaul life.

Read more:  What Gasoline Is Poured Into The Chainsaw

The fuel is a mixture of gasoline and oil for two-stroke internal combustion engines, which enters the carburetor from an internal gas tank with a volume of 410 ml.

In the design features of the power unit:

  • Crankshaft made of forged steel;
  • Wear-resistant chrome-plated cylinder liner;
  • Piston group with two compression rings and a working life increased to 5 years;
  • Simplified access to the air filter;
  • Reliable and durable ignition system;
  • Best-in-class Japanese Walbro carburetor.

Built-in primer. the pump provides quick engine start regardless of the ambient temperature.

Chainsaw carburetor Husqvarna 142-136

Chainsaw carburetor GOOD LUK GL45
120 UAH.

Rebir 1.4 chainsaw carburetor
UAH 200.

Headset

This assembly consists of a 15 “detachable guide bar, cutting chain in 0.325” pitch. The kit also includes a sprocket and tensioner. It is possible to install alternative kits of smaller size, to a greater extent meeting the requirements of the task.

Chain lubrication prevents overheating and accelerated wear. The system includes an oil pump with an adjustable capacity, a working fluid is supplied from a built-in 200 ml tank.

Technical and technological features

Higher quality materials are used in the production of the chainsaw range to increase productivity, operational reliability and durability. Also experience of successful implementation of past developments, own design solutions.

Only by purchasing the original, you can be completely confident that the power and other characteristics of the Husqvarna model 142 chainsaw will cope with cross, diagonal or rip sawing of all types of wood species up to 30 cm in diameter.

  • These characteristics determine the suitability of the tool for harvesting wood fuel, cutting up timber, forming crowns of decorative and garden trees.
  • The possibility of using the saw with tires that are smaller and more comfortable for working in inaccessible places determines the suitability of the tool for the construction of wooden structures of special and general purpose.
  • Working with a saw does not ask for professional qualifications, the necessary abilities are rapidly developed in the process of the work itself.

Specifications

The Husqvarna 142 has a compact design with easy access to adjustments and fillers. The 4.6 kg tool is well balanced and fits comfortably in the hand.

The ergonomic shape of the handles provides a secure grip when performing difficult work. Built-in vibration protection system and low noise level contribute to high labor productivity and preservation of the operator’s efficiency when performing large jobs.

Adjusting the carburetor of your Husqvarna chainsaw

Like all other saws, the husqvarna has the same carburetor adjustment algorithm. Therefore, the instruction will be relevant for other tools and models of chainsaws such as Husqvarna 142.236.

Before starting work Make sure the air filter is clean and 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 Husqvarna 137 is made only when the engine is warmed up.
  • Turning screw L clockwise, you need to set the highest revolutions of the crankshaft, then return it back by a quarter of a turn. Using the T screw, I adjust the crankshaft speed 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 the screw H. By changing the range, you can create restrictions to make the saw work efficient and save the motor resource.