How to remove the carburetor from a Husqvarna 135 chain saw

Adjusting the carburetor on a Husqvarna 135 chain saw

The best advice I can give you is to call in a specialist! Trust me when I tell you that they will adjust the carburetor and check the condition of the saw. If you still need to adjust the carburetor on the Husqvarna 137 without assistance, I’ll try to describe the process in detail. Also at the bottom of the post I have added a video of what is actually how to adjust the carburetor on the chainsaw at idle speed.

In the picture above you see three screws for adjustment. They have their professional purpose:

The T screw is necessary for adjustment of rpm at idle.

The L screw is used to adjust the low speed.

At first use the L screw (turn it) to find the highest rpm at idle. If we have found it, we should turn this screw a quarter of a turn against the clock hand. If in this case, the chain continues to rotate, then turn the screw T achieve its stop.

Then warm the engine at full throttle for about 10-15 seconds and turn the screw H a quarter counterclockwise. Wait 10 seconds and listen, the engine should sound like a 4-stroke. If you can hear a squeal, the mixture is lean (unscrew the screw), if the smoke is enriched mixture (tighten the screw).

After adjusting the low and high speeds, set the idle speed with the T screw. It is done in the following way:

2.4.Turn the T-screw clockwise until the chain begins to rotate.

3.Turn the screw to the other side until the chain stops.

With a properly adjusted carburetor, your chainsaw is fast and sound like a 4-stroke motor.

Cleaning the carburetor of a Husqvarna chainsaw

Why doesn’t the chainsaw start?? Infrequent malfunctions and methods of their elimination

Chainsaws are lightweight and reliable machines.

With the right call their failures appear rarely and quickly resolved, if the owner knows where to find the cause.

But there’s no definitive answer to the question of why the chain saw fails to start. This tool is based on an ordinary two-stroke gasoline engine. Four conditions are necessary for its normal operation: fuel, air, spark, and lubricant.

The carburetor is responsible for making the air-fuel consistency, the air is cleaned from dust by the filter, the spark is made by the ignition unit and spark plug, and the lubricant is in the gasoline.

Reasons for chain saw’s refusal to start should be found one by one, starting with ordinary ones and going to more complicated ones. Anyone who immediately rushes to disassemble the carburetor when the chainsaw starts badly in the heat is very risky. It is better to have this equipment repaired and adjusted in a specialized workshop, not by hand.

By the way, some chainsaw manufacturers, to keep users from getting into the carburetor to configure the fuel consistency, make the jets unregulated.

For a chainsaw to work reliably, special attention must be paid to fuel. If the fuel mixture is not properly prepared, then even a reliable Husqvarna will not start. And the proprietor would look for the cause of the problem everywhere else, but not in the fuel. To avoid this factor, you should always prepare a fuel mixture of high-quality gasoline and that brand of oil that is specified in the manual.

It should be made in such an amount that in 1-2 weeks it is completely exhausted. If you keep it in the can for a month the fuel will lose its octane properties and you will have problems with the saw’s operation.

READ Partner 350 Chainsaw Troubleshooting

remove, carburetor, husqvarna, chain

Quite often malfunctions of chainsaws occur due to the flooding of the spark plug with gasoline at the start. This problem can be solved by unscrewing and drying the spark plug (without burning it)!) You drain the excess fuel through the spark plug hole and then take a 20-30 minute break before replacing the spark plug and repeat the start. A good owner always has new spark plugs in stock so that when looking for trouble, you can eliminate that part from the list of suspects.

Lack of spark is often caused not only by plug failure, but also by poor contact between its tip and the high-voltage wire. If this connection when you check it does not cause suspicion, but the spark when you turn on the starter does not appear. the electronic ignition unit is to blame. This unit is not repaired, but replaced with a new one.

Remember that the inspection of the spark plug provides important information. If it is dry, it means there is no fuel in the cylinder and you have to check the whole chain from the carburetor on up. Black carbon deposits indicate improper adjustment of the carburetor, feeding too much fuel into the mixture, or oil overflowing into the gasoline.

How to correctly adjust the carburetor on a Husqvarna chainsaw

on a chainsawHusqvarna Adjusting the carburetor on a chainsaw with three THL screws.

Chainsaw will not start or does not start well.Cause and how to fix it.

If the chain saw starts and stops when you hit the gas, it is an indication of a bad fuel supply. The cause could be a clogged fuel filter or carburetor nozzle. You can check and clean the first unit very quickly, but in the second case it is better to trust the professionals.

To assemble and clean a chain saw carburetor you need experience and care. Therefore, it is usually taken only by those owners who have already repeatedly and successfully performed this procedure.

See also  Adjusting the carburetor on a Partner 350 s chain saw

The air filter also needs attention so that you don’t have to look in the wrong direction for the malfunctioning chainsaw. If it’s blocked with dust, you can’t count on a soft start and stable running.

Each model of chainsaws has its own characteristic and easily correctable malfunctions. Therefore, do not rush with disassembly and repair, and it is better to read the reviews of owners on the forums. STIHL chain saws, for example, may not start if the breather plug is clogged.

remove, carburetor, husqvarna, chain

This valve equalizes the pressure in the tank as the fuel flows out. When it is clogged, a vacuum is formed in the tank and the fuel stops flowing into the carburetor. This disease can be cured by cleaning the breather valve with an ordinary sewing needle.

To rule out the breather valve from the list of suspects is not difficult. To do this, disconnect the fuel hose from the carburetor and see if fuel leaks from it. If the fuel flows in a full stream, the breather is clean. If the fuel does not flow or flows very slowly, the cause is determined.

Many owners of new STIHL chain saws get worried when the idle speed increases after the first tank of juice has been pumped. This is normal behavior, according to experts, and indicates that the engine and carburetor are running in good condition. So, don’t rush to a service center and simply turn the carburetor idle speed down a little bit with the idle speed screw.

If you notice a drop in power and the chain saw cuts out when idling, don’t forget to check the muffler. It could be blocked with tar sediment from the exhaust. Cleaning the exhaust port and muffler fixes these problems.

It is especially annoying for the owner when all possible causes seem to be eliminated: a new serviceable spark plug is installed, the carburetor is accurately and correctly cleaned, the fuel is normal, but the chainsaw still does not want to start.

READ Petrol chain saw fuel system device

In this case, you need to look at the cylinder-piston group. Visual inspection of the cylinder and piston in this case helps to find the cause. If there are noticeable chips or scuffs on them, the saw will work properly only after replacing these nodes. Eliminate this problem by boring the cylinder for a new repair size piston.

Cleaning the carburetor and all about it: helpful tips

You already know: what is the cleaning of the carburetor chainsaw. We have painted all the nuances and minutiae, and now in the summary we will consider other options for breakdown or malfunction of the tool, accompanying clogged carb, to which you should also pay attention:

  • Failure of the rubber adapter. When it bursts, the chainsaw will show the same dysfunctional signs as a clogged carburetor. It is between the cylinder and the carburetor;
  • You can hear its name and as a spigot. In addition to this, that the carburetor in the saw is clogged, the spigot can get rotten;
  • Cleaning the carb won’t be enough, you’ll have to replace the rubber adapter. Make it easy to do so our catalog will help;
  • the fuel filter retainer may be cracked or broken, consequently, all the dirt goes into the carburetor;
  • the mesh on the crab, which is supposed to clean the gasoline that passes from the tank to the needle, may be clogged;
  • don’t forget to fix the number of revolutions to which the screws “H” and “L” were unscrewed. Adhering to the competent return of them in their place. you will save the settings of the carburetor, and in fact it is already a completely different article.

The structure and principle of work of the carburetor

The carburetor serves to prepare a combustible mixture in a ratio determined by the operator from gasoline and air.

The carburetor is designed to prepare a mixture of fuel and air in a manner determined by the operator. Excessively rich mixture or too lean mixture makes the engine unstable, can cause overheating, and accelerates wear of the piston system.

The proper setting and adjustment determines the proper functioning of the unit.

And for this you need to know the principles of carburetor of chain saw Husqvarna.

Its construction consists of the following elements:

  • housing with clamping bolts and a set of gaskets;
  • fuel pump. a device which pumps a gasoline-oil mixture into the carburetor;
  • diaphragm. designed to limit the flow of the combustible mixture into the engine;
  • float chamber. it collects fuel, the level is regulated by the float, the mixture is fed to the main chamber for mixing with air as needed;
  • main chamber. air flows through it and fuel is injected there as well, the amount of mixture fed to the engine is regulated by the throttle valve located here;
  • diffuser. a part of the narrowing of the air supply pipe in the place of fuel injection;
  • needle valve. a device that regulates the fuel supply;
  • nozzles. screws that regulate the mixture at high and low speeds, as well as the idle speed screw.

Also in the structure of the carburetor, in addition to the throttle, there is a damper, located at the inlet from the air filter. It artificially reduces the air supply, making the mixture more saturated to facilitate starting a cold engine.

The nozzle valve is responsible for fuel injection into the main chamber, it also prevents the ingress of air. When adjusting the carburetor on a Husqvarna chainsaw, special attention should be paid to this valve because. к. its condition has a direct effect on engine operation. The nozzle can stick if stored for too long. This restricts the flow of fuel and prevents the engine from starting.

Also from long-term use or because of a factory defect, the valve can let air into the main chamber. In this case, the only way to fix the problem is to replace it.

The operation of the carburetor is as follows: the air flow, falling into the diffuser, mixes with injected fuel, the resulting mixture is fed to the engine. The throttle valve controls the mixture. The more mixture, the higher engine speed.

When adjustment is necessary

A chainsaw carburetor option is rarely necessary. frequent problems with fuel flow, air flow, or component wear. But from time to time adjustments are still necessary:

  • Running engine stops after a few seconds, or it does not start. A very rich mixture is a prerequisite for this;
  • Excessive swirl, huge rpm, increased consumption. In this case, on the contrary, the mixture is very lean, in other words not enough air;
  • RPM is kept at the same level after it has been decreased or increased by the operator. A stuck needle valve may be a prerequisite.
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Factors that lead to such changes can be:

  • Powerful vibration damages the protective cover and the adjustment jets unscrew, changing options. In this case, you can adjust the carburetor on the chainsaw.
  • Wear on parts of the piston system. Adjusting the carburetor in such a situation can be a temporary help. Replacement of worn components is recommended.
  • Poor fuel quality, a defective filter or long storage time can cause blockage. In this situation carburetorPull out, wash with special fluid or unstained gasoline, reassemble and re-adjust.

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

Chainsaw carburetor repair with your own hands: the device, malfunctions, etc.

A chainsaw is also needed in construction, gardening and landscaping. its presence greatly simplifies the performance of a number of woodworking tasks. The main unit of this tool is the engine, the operation of which depends largely on the condition and settings of the carburetor. This is where the fuel mixture is prepared. So if the saw won’t start, stops, or doesn’t deliver enough power, it’s probably because the carburetor isn’t working properly. Fortunately, in many cases you can do it yourself. Only for this you need to know and understand the construction and principle of the unit and, of course, the chainsaw itself.

How a chainsaw carburetor works?

The main purpose of the carburetor is to mix fuel with air in the necessary proportions. If the latter are disturbed, it has an almost immediate effect on engine operation.

STIHL MS 181 C BE chain saw carburetor

Chainsaw carburetors may differ in design. However, their basic elements and principle of operation remain more or less the same.

The carburetor has an aerodynamic tube with an air inlet across which you can regulate the flow of air.

This part is where the base tube is narrowed. here the airflow rate increases, i.e.е. air is always supplied to the carburetor under some pressure.

The fuel is in contact with the air flow in this area. the fuel comes to the atomizer from the float chamber through the nozzle (metering device).

it is a tank that makes it possible to keep the fuel mixture in a stable state.

Constructional diagram of a chainsaw carburetor

The chainsaw carburetor works according to the following principle:

  • when starting the engine, the main flap opens and a jet of air is fed into the air duct with a certain speed;
  • the speed of the airflow and the float level in the chamber are controlled by the position of the choke, namely by the pressure difference in the float chamber and the air duct;
  • fuel from the float chamber is sucked into the nozzle and from there into the diffuser;
  • passing through the diffuser, the air captures the fuel that enters it;
  • the formed mixture is fed into the cylinder cavities through the intake channels.

The pressure in the float chamber is approximately equal to ambient pressure, but there is a vacuum in the carburetor air passages when starting the chainsaw engine. Opening of the damper increases the airflow rate. As a result, more fuel goes into the carburetor and the engine speed increases.

Why an initial adjustment??

In its first hours of use, the 2-stroke chainsaw engine needs a running-in phase, on which the quality of its further work depends. The first adjustment of the carburetor is made during the running-in period. the optimum parameters for preparing and feeding the fuel mixture are set.

The initial running-in of a chainsaw: Sweeping up thin material

Most modern chainsaws come pre-set when you buy them. Nevertheless, it does not hurt to check the quality of the factory settings. after all, you are the one who has to work with the tool.

At first start-up the chain saw has to work sparingly. It is therefore recommended not to overload the engine for a few hours after starting and only cut small branches and trunks up to 10 cm thick.

Simple rules can help to prevent malfunctions in the chainsaw carburetor:

How much fuel to put in the chainsaw engine

A chainsaw has to start right away and deliver a consistent chainwheel speed and smooth power build-up and drop-off. There should be no unusual knocks, pops or noises when the engine is running.

The Professional Hand-Powered Chainsaw at Work

When you run it in for the first time, it is important to make sure that the fuel consumption is in line with the power rating.е. in practice the saw should not go out, “sneeze”, smoke, or jerk.

How to spot a carburetor malfunction?

Typical carburetor malfunctions are easy to recognize. They are expressed in the fact that the chainsaw engine starts and immediately stops, or does not give signs of life at all. Or it spends fuel at full speed, producing clouds of black smoke and aggressive vibrations instead of the proper power.

Diagram of a chainsaw carburetor

The carburetor settings can be compromised when:

The chainsaw’s air filter with a capron insert

The problem must be repaired immediately. But how do you know that it is the carburetor? For this reason, check how your chain saw operates.

The list of typical signs that the carburetor settings have gone astray includes:

It is usually caused by improperly mixed (lean) fuel.

Expressed in increased exhaust emission, which turns black. This means that the fuel is not fully consumed, t.е. the mixture is oversaturated.

The carburetor settings are correct. the saw starts on the first try

Could be due to damaged mounting of adjusting screws or protective cap.

Indicates critical wear on the piston group, so adjusting the carburetor will postpone major repairs only for a short time.

Such a picture can be seen when the carburetor channels are clogged or its filters are malfunctioning. In this case the adjustment should only be carried out after thoroughly flushing the assembly.

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The maximum number of revolutions

To limit this figure, you should use a screw marked H. To increase the RPM turn it clockwise, and to decrease it in the opposite direction. The maximum frequency should not exceed the value of 15000 rpm.

If you make this figure more, the engine of the device will work on wear and tear, which will lead to problems in the ignition system. When turning this screw, you need to consider the ignition processes of the device. If the slightest failures appear, the maximum speed value should be reduced.

How to remove the carburetor from a Husqvarna 435 chainsaw. Construction Portal

Greetings dear and most loyal readers of my blog. In today’s article, I decided to consider how to adjust the carburetor on the chainsaw. After all, as it seems to me, you have more than once faced the problem that your “dear” let you down when you needed it so much. And since you and I are frugal and do not want to spend money on what we can do ourselves, let’s learn how to adjust the carburetor on our chainsaws with our own hands, without involving professional repairmen. And as you will soon see, it is quite easy to do. You don’t even need anything special to perform. I specifically reviewed the carburetor adjustment of all known brands of saws, each of which has its own tricks and nuances and in my opinion this is the best information on the web!

So, let’s begin!

  • First, the instruction manual of the device itself.
  • Second, the tachometer. What exactly do we need it for, we’ll see a little bit later.
  • Third, a screwdriver.

Oddly enough, that’s all we’ll need.

First, take a close look at the device of your saw. The first thing you need to do is to determine where the carburetor jets are, and what is even more important than the jets. the adjustment screws. Usually, there should be two or three screws. One of them adjusts the idle rpm, and the other two adjust the low and high rpm.

These are the ones you need to adjust, either to tighten or loosen in order to enrich or deplete the fuel mixture.

If you need to tighten the mixture, just twist the regulator clockwise, if you need to make it richer, then twist it counterclockwise.

To adjust idle RPM, the screw responsible for this also needs either to be turned clockwise to increase RPM, or, as you have already guessed, in the opposite direction to decrease them.

But I want to warn you, be careful when adjusting the carburetor. Because both leaning and enriching the fuel mixture, as well as playing with the speed, has very serious consequences.

And now let us take a look at the peculiarities of adjustment on different models, both more modern and domestic, and more familiar to us.

When you might need a tune-up.

A good STIHL chainsaw 180 (or any other chainsaw) should give you a long and good working life if it is used properly. But anything can happen.

  • Locking screws are loose
  • The engine is worn out (in that case the adjustment of this chain saw, as well as Goodluck or Sturm will help only temporarily, ideally it is better to take it to repair immediately)
  • The carburetor is clogged (in this case you need to clean it as well).

Step by Step Adjustment

The STIHL 350 chain saw has many of the same adjustments.

After production, these chainsaws are tuned for more mix than necessary. It should be like this only during the first hours.

When the engine is warmed up it’s best to readjust it. At idle, turn the T screw counterclockwise until the chain stops, then adjust each in order: L, H,T.

The L screw should be turned ¼ turn counterclockwise at the point where the greatest turns occur when idling.

The H screw is adjusted as follows: warm up the carburetor and turn it counterclockwise by ¼ turn. To determine if everything is in order you will need a tachometer. The rpm should be the same as the maximum rpm listed in the manual.

Your actions should cause the engine to immediately accelerate and noise like a quadruple.

The Husqvarna carburetor is tuned the same way.

The Partner 351 differs only in that its factory settings initially supply the optimum amount of mixture, which means that everything should work correctly right away. But, if necessary, the above instructions will help you adjust the carburetor correctly.

Adjusting the Ural

It is a little different in that it should not be carried out at a sharp maximum rpm, but make sure that the chain gained them quickly, but smoothly, without shifting on the bar.

The Metabo Metabo powermaxx bs screwdriver chuck should be taken seriously because if you don’t do it properly, you won’t keep the saw for long. Take care of your tools and if you’re not sure about your abilities, take it to a professional.

Any of them, even the sturdy Friendship, needs attention and care. You’ll keep your chain saw in action for years to come.

When buying the chainsaw HUS365 you have to be ready that after a month of its use you would not like to deal with any other saw but this one. This is because it is reliable, affordable and, most importantly, easy to operate.

How to know you’ve done it right

After the tuning is complete you need to start the chain saw. Check that it runs smoothly at idle speed. The chain must not move. When you press the gas pedal the chainsaw has to accelerate and stop without any delay.

At low and high RPM the Husqvarna 350 should be stable without excessive noise. At the time of operation, there should not be a sudden loss of power or shutdown.

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