How to adjust the carburetor on your Husqvarna 236 chain saw

How to adjust the carburetor on a Husqvarna 240 chain saw

Modern chainsaws have a complex system and consist of several major assemblies that periodically require maintenance and adjustment. In this article we will talk about how to adjust the carburetor on a Husqvarna chainsaw.

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

  • high idle speed;
  • strong smokiness when the tool is working;
  • Difficulty in starting a cold or hot engine;
  • Lack of traction and reduced maximum rpm.

This is by no means a complete list of problems that can be solved by adjusting a Husqvarna carburetor. In a number of cases, adjustment of the quality and quantity of fuel mixture is carried out after an engine overhaul or during a scheduled maintenance of the chainsaw.

The manufacturer of the Husqvarna AB recommends adjusting the carburetor before and after running-in.

Husqvarna carburetor design and operation

To successfully set up your Husqvarna chainsaw carburetor you’ll need to be familiar with its construction and understand how it works. In fact, everything is not as complicated as it seems at first glance.

The saw’s 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 coringula. They work together to dispense fuel to the main chamber and the two flaps.

One of the flaps is designed to regulate the flow of fuel into the cylinder when you press the gas, it is called throttle, the second is responsible for limiting the air supply from the air filter to facilitate cold start Husqvarna chainsaw. At the moment when the operator closes the air flow to the carburettor by means of the choke, the fuel mixture is depleted and the flow to the cylinder increases, which makes the chainsaw much easier to start than when the cold start is done in normal mode.

The Husqvarna carburetor involves a nozzle valve, which atomizes the fuel and prevents air from entering the main chamber. It is often the fault of this element that causes the sawmill to malfunction. For example, the valve, if not stored properly, the chainsaw can stick, the fuel supply will stop, making it impossible to run the engine. also malfunctions of injectors can cause air leakage in the carburetor’s main fuel chamber. In such cases, adjustment of adjusting screws position will not correct the situation, you will need to repair or replace the node.

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

  • Screw (L). adjusts fuel quantity in low and medium revolutions;
  • (H). is responsible for traction at high revolutions and their quantity;
  • (T). adjusts throttle valve position, thus controlling the amount of fuel mixture entering the cylinder and engine operation in idle mode.

Screws (L) and (H) cannot be adjusted without certain knowledge and experience. Incorrect adjustment of the quality and quantity of the fuel mixture can cause the engine to stop working or to run incorrectly, leading to rapid wear and tear or even jamming.

The work of adjusting or repairing the carburetor on Husqvarna chain saws can be performed without having certain experience. In order to do everything correctly, you need to follow the algorithm and have a minimum set of tools. It is also worth assessing your strength in advance and do not take risks if you do not understand anything at all about technique. Believe me, sometimes it is better to pay a small amount of money to the master than to spoil the instrument by independent adjustment.

How to use, design, and function of a carburetor.

The carburetor is needed to prepare the air-fuel mixture for engine power. If the proportions in this mixture are wrong, the operation of the motor is disturbed. If the proportion is not correct, the mixture is called oversaturated, and if there is not enough fuel, the mixture is called lean. Both affect the operation of the engine not in the best way.

In different models of chainsaws carburetors differ in design, but in principle they are similar. High velocity air travels in the air duct. The choke, which closes the channel, lets you change the speed of the air jet. Fuel is pumped through the nozzle into the channel where it mixes with the incoming air to form an air-fuel mixture. The resulting mixture enters the engine.

The pressure in the float chamber, where the fuel is before mixing, is almost equal to atmospheric pressure. But in the air duct there is created a vacuum, thanks to which the fuel is sucked into the air flow. The more the damper opens, the faster the air moves, and the amount of fuel also increases. the engine speed rises. This is a simplified representation of how a carburetor works.

The chainsaw carburetor needs to be tuned for efficient, smooth operation of the tool, getting maximum output while consuming fuel economically. Check the fuel and air filters before adjusting. they must be clean. Most chain saws have three settings: idle speed, high rpm, low rpm. The following signs are indicative of a properly adjusted carburetor:

  • The chain does not move when idle.
  • Engine accelerates smoothly and quickly.
  • Engine sounds smooth, like a four-stroke engine.

You must be as careful as possible when adjusting a carburetor, because a mistake in settings can have very serious consequences, up to and including engine trouble. If you are not 100% sure of your abilities, you need to contact a service center.

Your Husqvarna 236 chain saw does not shut down on the throttle

This problem is most often encountered by owners who fuel their saws with low-quality fuel. Hazardous impurities in gasoline cause the fuel pump to clog quickly. This leads to the fact that when you pull the trigger, the pump can not instantly pump into the cylinder the amount of fuel that is necessary for stable operation of the garden tool.

To solve the problem, the saw owner will need to remove the fuel pump and inspect it. As a rule, the pumps in Husqvarna 236 chain saws cannot be repaired, so it is best to replace them with new elements.

To prevent further problems with the Husqvarna saw pump it is necessary to fill up the chain saw only with a quality fuel mixture prepared with the gasoline that is specified in the instruction manual of the model.

The structure and operation of a Husqvarna carburetor

To successfully set up and adjust the carburetor on your Husqvarna chain saw, it’s important to know the setup and understand how it works. It’s not as complicated as it sounds at first glance.

The carburetor has a built-in fuel pump, which is responsible for transporting the gasoline-oil mixture, as well as a diaphragm and a needle valve with a coringula. They work together to dose the fuel to the main chamber and the two flaps.

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One of the flaps is designed to regulate the fuel flow into the cylinder when the throttle is pressed, it is called a throttle valve, the second is responsible for limiting the air supply from the air filter to facilitate starting a cold Husqvarna chainsaw. The moment the operator cuts off the air flow to the carburetor with the choke, the fuel mixture becomes leaner and the flow to the cylinder increases, making the chain saw much easier to start than when a normal cold start is performed.

The Husqvarna carburetor involves a nozzle valve, which atomizes fuel and prevents air from entering the main chamber. Often problems with the operation of the saw can be caused by defects in this very element. For example, the valve may stick if the chain saw is not stored properly, fuel supply will stop, making the engine impossible to operate. Also, malfunctions of the nozzle can cause air leakage into the carburetor’s main fuel chamber. In such cases, adjusting the position of the adjusting screws will not fix the situation, you need to repair or replace the unit.

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

  • screw (L). adjusts the amount of fuel in low and medium speed mode;
  • (H). is responsible for traction at high revolutions and their quantity;
  • (T). changes position of throttle flap, thus regulating amount of fuel mixture entering a cylinder and engine operation in idle mode.

Screws (L) and (H) cannot be adjusted without some knowledge and experience. Incorrect adjustment of the quality and quantity of the fuel mixture can cause the engine to stop working or to run incorrectly, leading to rapid wear or even jamming.

Features of the Husqvarna 236

Husqvarna is committed to complying with all existing environmental standards, so it equips its saws with modern two-stroke engines made with X-Torq technology. This engine is fitted to Husqvarna 236 saws.

X-TORQ

The essence of the system is that during operation the cylinder is blown with clean air, while on conventional engines a new batch of fuel mixture is blown.

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This solution reduces the amount of fuel burned in the exhaust and makes it cleaner and safer for humans and the environment.

The advantage of this technology is lower fuel consumption. Disadvantages include a small loss of power compared to similar-sized saws.

Primer

Another feature of the Husqvarna 236‘s design is a manual fuel pump called a primer.

The pump is mounted on the chainsaw body and is designed to facilitate starting after long periods of inactivity. To inject fuel into the carburetor’s main chamber, simply push the primer a couple of times and then continue according to the instructions on the chainsaw body.

Combination control

Another feature of the Husqvarna 236 design is a combination lever, with which you can control the position of the air damper and stop the engine.

The function is quite useful, according to the manufacturer, allows you to increase the stability of the chainsaw engine.

Air purification system

Husqvarna 236 uses a centrifugal cleaning system called Air Injection. It extends the service interval of the air filter, which has a positive effect on the cost of owning a chainsaw.

What is the carburetor?

A carburetor is a device that has the following functions: mixing gasoline and air, creating a combustible mixture to power the engine, and regulating its flow. Husqvarna carburetor parts are made by casting with various alloys, and then machined and finished. This ensures the high quality of Husqvarna carburetors, as you can see by buying this spare part in the store “220 Volt”.

It is an essential element of many garden tools such as chainsaws, brushcutters, lawnmowers, etc. In a number of situations, such as poor fuel filtration, the carburetor can fail. Fortunately, this will not be a reason to spend money on a new tool, because you can buy a carburetor separately (both regular and assembled).

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

Modern carburetors are equipped with many different devices and systems that have numerous holes of different calibers, an extensive network of channels, pneumatic chambers and lever gears.

The carburetor is one of the main parts of any fuel-powered machinery. To ensure normal and stable operation of the equipment, you should periodically check and, if necessary, make adjustments to the carburetor.

Chainsaw carburetors have three adjustment screws. The “L” screw is for regulating low RPM, the “H” screw is responsible for regulating high RPM, and the “T” screw is for idling the chainsaw. For example, the “H” and “L” screws regulate the ratio of the air and gasoline mixture, when unscrewing the screws the revolutions increase, because the mixture is enriched, and when tightening the screws the revolutions drop.

But in many cases the carburetor adjustment does not fix the equipment malfunction. This is due to a final breakdown of the part, which occurs as a result of natural wear and tear or due to improper operation.

You can buy a new part for your equipment in our online store. We offer carburetors for brushcutters, chain saws, chain saws, diesel and gasoline generators as well as carburetors for blowers and other equipment.

Versatile, multi-purpose saw for part-time use. Narrow and sleek design, excellent power-to-weight ratio, and some of the best vibration performance of any saw available. Economical pump stops delivering lubrication to the chain when the saw is idling. Easy Start System.New spring-loaded starter mechanism and fuel pump that reduces the amount of jerking required to start.

Air injection Centrifugal air cleaning system for long filter cleaning intervals, trouble-free operation and reduced wear and tear. Easier to start Combined regulator/stop makes it easier to start the saw.easy-to-use The narrow housing, high center of gravity and flat bottom make our saws exceptionally easy to operate.

Dual mass principle Vibration damping system and handles isolated from motor by steel springs.Independent anti-vibration system. Smooth operation Damper clutch reduces vibration in carburetor. Ensures smooth operation and long service life. Three-piece crankshaft Forged three-piece crankshaft designed to maximize durability and built for the toughest applications.

Better grip Curved front handle for better grip and natural working posture.

Gasoline pruning saw for wood: brands, features.

Economical pump Economical pump stops lubrication at idle speed.

Fast acceleration The low weight of all moving motor parts ensures fast acceleration.

Easy cleaning Air filter with bayonet mount makes it easy to remove the filter for cleaning.

Safe to use Dual-action chain brake, right hand guard, and chain stop enhance saw safety.

What is a carburetor?

A carburetor is a device that has the following functions: mixing gasoline and air, creating a combustible mixture to power the engine, and regulating its flow. Husqvarna carburettor parts are made of various alloys by casting and then machined and finished. This ensures a high quality of Husqvarna carburetors, as you can see by purchasing this part from “220 Volt” store.

It is an indispensable element of many garden tools, such as chainsaws, brushcutters, lawnmowers. In some situations, such as poor fuel filtration, the carburetor can fail. Fortunately, it will not be a reason to spend on a new tool, because you can buy a carburetor separately (both regular and assembled).

The carburetor is a device that is designed to prepare a combustible mixture of liquid fuel and air that makes internal combustion engines work.

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

The carburettor is one of the major components of any vehicle that runs on fuel. In order to ensure normal and stable operation of the equipment, it is necessary to periodically check and, if necessary, make adjustments to the carburetor.

There are three adjustment screws on chainsaw carburetors. The “L” screw is for low speed control, the “H” screw for high speed control and the “T” screw for idle speed control. Thus, the screws “H” and “L” regulate the ratio of the mixture of air and gasoline, with unscrewing the screws the speed increases, because the mixture is enriched, and with tightening the screws the speed drops.

However, it is quite common when the adjustment of the carburetor can not fix the problem with the equipment. This is due to the final failure of the part, which occurs as a result of natural wear and tear, or due to improper use.

You can purchase a new part for your appliance in our webshop. We offer carburetors for brushcutters, chain saws, chain saws, diesel and gasoline generators, as well as carburetors for blowers and other equipment.

Versatile, multi-purpose saw for part-time use. Narrow and sleek design, excellent power-to-weight ratio and some of the best vibration scores of any saw in existence. The economical pump stops the chain lubrication when the saw is idling. Easy start system.new recoil starter mechanism and fuel pump that reduces the jerking required for starting.

Air injection Centrifugal air cleaning system for long filter cleaning intervals, trouble-free operation, and reduced wear and tear. Easy to start Combined regulator/stop makes it easy to start the saw.De-compression valve Easy to operate The narrow body, high center of gravity and flat bottom make our saws exceptionally easy to operate.

Two-mass principle Vibration damping system and handles isolated from motor by steel springs.Independent anti-vibration system. Smooth operation Dampening clutch reduces vibrations in carburetor. Ensures smooth operation and prolongs service life. Three-piece crankshaft Forged three-piece crankshaft designed to maximize durability and designed for the toughest applications.

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

Gasoline tree pruning hedge trimmer: brands, features.

Economy pump Economy pump stops the lubrication at idle speed.

Fast acceleration The low weight of all moving motor parts means fast acceleration.

Easy cleaning A bayonet-mounted air filter makes it easy to remove the filter for cleaning.

Safe handling A double-action chain brake, right hand guard and chain stop help make sawing safer.

Pros and cons of using the Husqvarna 236

Every chainsaw has both positives and negatives associated with its operation, maintenance and repair. The Husqvarna 236 is no exception. According to real users of this saw, it sprays very well, but does not start very well.

Service experts say that the Husqvarna 236 is very finicky to maintain and repair. Especially the carburetor, which is slightly different in design than previous Husqvarna models.

Zama is equipped with a Zama carburetor with a booster pump, which fails quickly if improperly stored.

The problem can be solved by replacing the o-ring on the pump piston. Repair kits that include rubber booster pumps are rarely sold, and for this reason it is necessary to replace the entire carburetor, which greatly increases the cost of repair.

Chainsaw carburetor adjustment

Most chainsaw carburetors have three screws for adjustment:

  • L. set screw for low speed adjustment
  • H. the screw of the nozzle for adjustment of high revolutions
  • Screw T in a partner and Husqvarna (Stihl LA). adjustment of idle speed of chain saw

Screws H and L are used to adjust ratio of petrol/air mixture determined by the carburettor choke opening. Unscrewing the screws enriches the mixture and the rpm increases accordingly, while tightening the screws depletes the mixture. the rpm drops.

T(LA) screw is for adjusting the idle speed. The basic adjustment of the chain saw is done at the factory during the final testing of the machine. The carburetor is usually set for a richer (than optimal) fuel mixture. The factory setting should be maintained for the first hours of operation. Then (optional) a more precise carburetor adjustment is made.

Start with the idle speed adjustment by turning the screw T (LA) counterclockwise until the chain stops completely at a stable engine speed.

For further fine tuning you need a tachometer and it is best left to a professional. in most cases you might not need it.

We start from the L screw, then use the H screw and finally the T screw (LA).

Find the highest idle RPM, to do it turn the screw L slowly in different directions. After you have found the highest rpm position you have to turn the L screw a quarter turn anticlockwise. if the chain is idling, turn the screw T clockwise until it stops.

Use the H screw to adjust power and RPM. Adjusting the carburetor for lean mixture leads to excessive RPM, engine overheating and failure of the chainsaw piston.

Let the chainsaw idle for at least 10 seconds and turn the screw H about 1/4 turn counterclockwise. Let the engine run for about 10 seconds. Then check the maximum engine rpm with a tachometer. If the maximum rpm does not correspond to the passport rpm, this operation should be repeated. If the mixture is too rich, the muffler starts to smoke and if the mixture is too weak the saw squeals and overheats.

Finish the adjustment by adjusting the idle speed, as already described above. The idle speed is set correctly when the engine is running smoothly at minimum RPM and the chain is not rotating.

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

Modern chainsaws have a complex system and consist of several major components that require periodic service and adjustment. In this article we will talk about how to adjust the carburetor on a Husqvarna chain saw.

When the carburetor on a Husqvarna chainsaw needs adjustment

Problems, the solution to which can be the adjustment of the carburetor, quite a lot. Adjustment of the carburetor of a Husqvarna chainsaw is necessary when malfunctions such as:

  • High idle speed;
  • heavy smokiness when the tool is running;
  • Difficulty starting a cold or hot engine;
  • Lack of traction and reduced maximum rpm.

And that’s just about the only list of issues that a carburetor adjustment on a Husqvarna chainsaw can fix. In some cases, the adjustment of the quality and quantity of the fuel mixture is carried out after an engine overhaul or during the scheduled maintenance of the chainsaw.

The manufacturer Husqvarna AB recommends adjusting the carburetor before and after the running-in.

STIHL and Partner saws

On STIHL 250 and 361 chain saws as well as on Partner 351 and 350 the carburettor is adjusted with the H and L screws by adjusting the petrol and air proportions. If you release them, there will be a large amount of fuel added and therefore the RPM will be high, otherwise the opposite will drop.

The idle speed in Partner chain saws is adjusted with a screw with the letter T, and in Stil, as a rule, you should look for the marking LA. Standard adjustment of the chainsaw is carried out during the final tests. Basically after such adjustments the percentage of fuel in the working mixture is more than air, which does not correspond to the optimal parameters. But they should be maintained during the first hours of operation during the break-in period. You can then adjust the saw yourself, but it will also work fine with the factory settings.

But if you decide to adjust it yourself, the actions need to be performed in this sequence:

  • adjust the L screw;
  • then adjust the H jig;
  • after that go to the idle speed setting with the T screw (if STIHL chain saw. LA).
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First turn the L screw in both directions to find the maximum engine speed. If the same point is found, then the same screw should be turned ¼ thus slightly reducing the revolutions. If the chain continues to move at idle speed, immediately turn the T (LA) screw until the chain comes to a complete stop.

After adjusting the maximum rpm with the screw H, check the frequency with the tachometer. If it does not correspond to the figures given in the service book, the tuning should be repeated. When at maximum rpm a lot of smoke comes out of the exhaust pipe, then the mixture is too rich in fuel, if you hear noises and the engine gets very warm, then on the contrary. poor. Then you need to adjust the idle speed. When the tuning is correct the engine should sound smooth at low RPM and the chain should not move.

Chinese models

Adjusting the carburetor of a Chinese chainsaw, for example, Carver, is done in much the same way as the factory models. There are the same three basic adjustment screws L, H, T. Sometimes these models have the ability to adjust the idle speed. But as a rule, workers of specialized services and owners of such saws say that it is not always possible to adjust the quality of a Chinese chainsaw immediately.

For classic Chinese models, the L screw should be 1.5 turns off the maximum value. Screw H needs to be backed off one turn from maximum. The idle speed is adjusted in the same way.

Thus, the independent adjustment of the carburetor chainsaw is not a very difficult process and can in most cases be carried out by a self-taught person.

Adjusting the carburetor on your Husqvarna chain saw

Husqvarna 236 saw malfunctions and troubleshooting

There are also some typical problems with the Husqvarna 236 chain saw. It happens sometimes that the chain saw will not start or stops when you press the gas. The cause is probably a worn clutch. To remove and replace the mechanism with a new one, first unscrew the air filter and spark plug. Carefully remove the sprocket, coil, and washer. Install a new clutch sprocket and reassemble the machine in the same way. If you hear unusual noises after the first few starts, do not be alarmed. the drive sprocket may rotate slightly until it snaps back into place.

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Another frequent problem is a lack of oil in the chain of Husqvarna 236 chain saw. If this is the case check the oil pump and hoses for leaks. To solve this problem, proceed in this sequence:

  • Remove the protective cap, starter spring and air filter;
  • There is a pump on the right under the filter. Inspect it for damage. Replace if necessary;
  • Inspect the quality of the hoses, their fastening. It is also worth replacing them if necessary.

How to adjust the carburetor on a Husqvarna 236 chain saw?

Adjusting the carburetor of the Husqvarna 236 chainsaw is necessary if there are problems with idling or when the tool stalls when the throttle is increased. You should also adjust the carburetor when operating conditions change. Its construction is simple and straightforward, and any user can adjust it. The main adjusting screws are shown in the photo below:

Correctly adjust the carburetor in the following sequence:

  • Warm up the engine for about 5 minutes.
  • Turn the L screw up to maximum rpm, then immediately turn it a quarter turn back.
  • Hold the throttle grip and turn the screw H a quarter turn forward.
  • After 10 seconds, turn the throttle back and turn the screw T clockwise until the chain starts to move. Immediately afterward, turn the screw back until the chain stops.

For clarity, we also suggest reading a video that demonstrates the adjustment process:

Adjusting the carburetor of the Husqvarna 236 Saw

You can adjust the carburetor on your chainsaw with your own hands adjusting the carburetor on a chainsaw allows the tool to operate efficiently at full power and fuel-efficiently. Adjusting

Adjusting the chainsaw carburetor ensures that the chainsaw operates efficiently at full power and consumes less fuel. Adjustment should be performed with a clean fuel and air filter. For more carburetors adjustment is done with 3 screws: for high and low speed and idle speed adjustment.

Use screws H and L to adjust the gasoline/air consistency ratio determined by the carburettor throttle opening. untightening the screws enriches the fuel-oil mix and lowers RPM, tightening the screws weakens the fuel-oil mix and increases RPM.

The designation H for the high RPM screw that controls the main nozzle, and L for the low RPM screw that controls the idle speed nozzle. The idle speed can be precisely adjusted with the S screw. From time to time, in order to simplify the option, the number of available carburetor adjustment screws are reduced.

Setting the carburetor chain saw is divided into two steps. the basic (factory options), carried out when the engine is off. and final, made on a running warm engine. The exact values of the turning angles are to be found in the instruction manuals for the different chain saws. Failure to comply with the manufacturer’s instructions may result in damage to the motor.

Husqvarna 236 carburetor repair (replacement of the repair kit)

Replacing the carburetor repair kit on the Husqvarna 236 chain saw.

Husqvarna 240.And again about the carburetor.A design flaw or what is it?

Husqvarna 240 chainsaw carburetor problem.One of the most common problems with this chainsaw. Perfect

Slowly turn the maximum RPM H and minimum RPM L adjustment screws clockwise until they stop and then turn them back two turns

Checking and Adjusting the Idle Speed.

Find the highest idle RPM, for this slowly turn the L screw in different directions. After finding the engine RPM position, turn the L screw a 1/4 turn counterclockwise. If the chain is still rotating when idling, turn the T or (S) screw clockwise until it stops.

Checking and Adjusting the Maximum RPM.

Change the maximum rotational speed with the H screw. When it is turned in (clockwise rotation) the RPM increases, when it is turned out it decreases. Chainsaw engines have the highest rotational speed from 11500 rpm. up to 15000 rpm. A higher speed is not provided by the ignition, moreover, it becomes dangerous for the engine. The RPM limit can be determined by the ignition intermittence. If it occurs, turn counter-clockwise the H screw a little.

If the engine is not checked on acceleration and maximum rpm the tuning of the chain saw cannot be considered as finished.

When smoothly pulling on the gas pedal trigger the engine should quickly and surely gain RPM from idle to maximum (from 2800 rpm and above).up to 11,500-15,000 rpm depending on the machine). if the rpm are slow and lag behind, the screw L should be turned slowly anticlockwise, but not more than by 1/8 of a turn.

After adjusting the acceleration and maximum revolutions, you should again check the work of the saw at idle. the engine should run steadily, the chain should not move. Chainsaw adjustment must be repeated if this condition is not met, but except for the basic adjustment step.