Adjusting the carburetor of the husqvarna 240 chainsaw

Technical characteristics of the chainsaw “Husqvarna 240 16-3 / 8 9665112-26”

adjusting, carburetor, husqvarna, chainsaw

This model costs 13,000 rubles. and has an air purification system that reduces filter wear. The engine in the device is quite reliable and powerful, it contributes to economical fuel consumption, reducing harmful emissions. The chainsaw must be additionally warmed up when starting. Once the cold tool has started, let it run for 30 seconds. Then you can engage and release the throttle lever. This will prepare the instrument for work..

The “Husqvarna 240” chainsaw described in this section, the technical characteristics of which should interest you, has a 40-cm tire, as well as a power of 2 liters. from. The volume of the engine is 38.2 cm 3. and the fuel tank holds 0.3 liters. It will be possible to pour oil into the tank in a volume of 0.2 liters. Before purchasing this equipment, you must take into account that it belongs to the household class and weighs 4.7 kg. The number of links in the equipment is 56, the groove width is 1.3 mm, but the noise level is 100.7 dB.

Husqvarna 240 Chainsaw Carb removal

User’s manual

The manufacturer emphasizes that the saw should not be used until the chain has been treated with a sufficient amount of oil. Before starting work, you must read the instructions also because from it you can learn about safety measures during work.

For example, improper combination of chain and guide bar will increase the likelihood of kickback. But even if you read the manual, it is impossible to predict possible situations when using the saw, so the operator should be careful using common sense. It is necessary to use protective headphones, a special helmet, goggles and overalls during work.

The Husqvarna 240 chainsaw, whose technical specifications you can see below, is the equipment that follows the Husqvarna 236 range. If a comparison is made between these two options, it should be noted that the latter has a higher power, a slightly longer tire and has an engine that saves fuel up to 25%..

The Husqvarna 240 chainsaw, which does not need to be repaired very often, is an environmentally friendly tool, which is very important for some users. The volume of harmful emissions into the atmosphere has been reduced, and the number of cuts per fuel filling has been increased. Quite often, the products of the above-mentioned Swedish company are compared with chainsaws from the manufacturer Stihl. As an advantage of the former, the presence of a primer should be highlighted to simplify the launch. However, as practice shows, this does not greatly affect the process of starting up the equipment..

Carburetor adjustment

The Husqvarna 240 chainsaw, which can be adjusted by yourself, is a tool that should not be repaired at home. However, you can do the adjustment of the mentioned node yourself, for this you need to learn how to distinguish between the screws. Each of them has a letter designation, the first is for adjusting low rpm, the other for adjusting high rpm, while the third is used for adjusting idle.

Although the factory setting is considered optimal, the screws can be used to tune the engine. This is sometimes required when climatic conditions differ from those recommended by the manufacturer. To increase the speed, the first two mentioned screws must be turned clockwise. The sequence of using the screws is the same as indicated above. If you have some doubts, it is better to contact a specialist, because if the carburetor of the Husqvarna 240 chainsaw is set incorrectly, the engine may be damaged..

What is important for the consumer to remember

Chainsaw “Husqvarna 240”, the technical characteristics of which should help you make the right choice, after purchase requires fine-tuning with a file. In this case, we are talking about adjusting the carburetor. It is also important to remember that this equipment does not have a system for adjusting the oil supply for chain lubrication, but it quite often happens that the oil tank is emptied faster than the tank designed for the fuel mixture..

  • brake lever;
  • economical fuel consumption;
  • anti-vibration system.

But this list is not considered complete by consumers. They like the presence of a brake lever in the model, as well as the ergonomic design, low exhaust volume, as well as the presence of a chain tensioner.

Chainsaw repair: checking the ignition system

Even the highest quality equipment sometimes requires repair. Chainsaw “Husqvarna 240”, the technical characteristics of which were mentioned above, is no exception. If a breakdown occurs, then first you need to inspect the spark plug, but before that, the wire is disconnected, and the spark plug is turned out with a special key. If it is dry, then the fuel mixture does not enter the cylinder. The malfunction in this case does not concern the ignition system..

Chainsaw carburetor tuning Husqvarna 240

Ignition adjustment after carburetor adjustment

If cleaning and adjusting the carburetor did not correct the existing problem, you need to check the spark plug and tune the engine. It is worth acting in the following order:

  • The candle is unscrewed and a visual inspection is carried out. If it is dry with light brown carbon deposits, it can be considered intact..
  • If traces of gasoline are found on the spark plug, readjust the carburetor. This is because it supplies an excess amount of fuel to the internal combustion engine, filling it.
  • If the candle looks normal, check the electrical equipment. First of all, the cable that supplies current to the candle. The end of it is brought a short distance to the radiator grille of the cylinder and the starter is turned with a cord. A spark should slip through. If not, the cable is checked with a tester and, if necessary, replaced..
  • If the cable is in good condition, the ignition coil is tested. If the inspection does not reveal singed or broken wires, the coil is called with a tester, comparing the data with the accompanying documentation. If deviations are found, the block must be replaced with a similar one..
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After replacing the coil unit, the magneto gap should be set. The gap between the ignition coil and the flywheel should be between 0.2 and 0.4 mm. To set the gap, you need a set of probes or you can use foil of a suitable thickness. The probe is clamped between the coil and the flywheel at the time of installation, and then pulled out.

Adjusting the carburetor of a Husqvarna chainsaw

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..

Chainsaws Partner and Stihl, their adjustments.

In Stihl and Partner chainsaws, the proportion of air and gasoline in the mixture is set with adjusting screws H and L. When the screws are loosened, the mixture is enriched, the speed increases. Screwing in leads to a leaner mixture and, accordingly, a decrease in engine speed.

Setting the carburetor of the partner’s chainsaw to idle is carried out with the T screw (Stihl marks this adjustment with the letters LA). Basic tool setting is done in the factory during final testing. In most cases, the carburetor is adjusted to deliver a slightly richer air-fuel mixture than the optimal design. The factory settings must be saved during the first few hours of operation, during the running-in period. After that, a finer adjustment can be made, although this is not necessary, the saw will work normally on the basic settings..

For fine adjustment of the carburetor, a tachometer is required, in addition, technical documentation will be required in order to carry out work in strict accordance with the manufacturer’s requirements. The best solution would be to entrust the jewelry tuning of the fuel equipment to specialists..

If, nevertheless, it is decided to adjust independently, you should start with the L screw, then go to the H nozzle, and then set the idle speed by rotating the T screw (or LA – if it is a Stihl saw).

By smoothly turning the screw L in both directions, a position is sought at which the idle speed will be maximum. After this point is found, it is required to unscrew the screw L by 1/4 turn. If the chain continues to move when the engine is idling, the T (LA) screw is slowly unscrewed until the chain stops..

After setting the maximum speed with the screw H, the value of their frequency is checked by the tachometer. If the speed at maximum does not correspond to the values ​​indicated in the documentation, the adjustments are repeated. If the mixture is too rich at maximum speed, too much smoke comes out of the muffler, when the mixture is poor, the saw makes a squealing sound and the engine heats up unnecessarily. The adjustment ends by setting the idle speed – the position is considered correct if the engine runs exactly at the minimum speed and the chain is at a standstill. The idle speed setting can be viewed in the video below..

Carburetor adjustments or repairs on Husqvarna chainsaws can be done without any prior experience. In order to do everything right, you must follow the algorithm and have a minimum set of tools. It is also worth assessing your strengths in advance and not taking risks if you do not understand anything at all in the technique. Believe me, sometimes it is better to pay a small amount to the master than to ruin the instrument by self-adjustment.

How to adjust correctly

For this, the device has 3 adjusting nozzles. The idle speed screw (T) is located at the top of the carburetor. Below there is a pair of jets for adjusting the fuel supply at minimum (L) and maximum (H) rpm, left and right, respectively.

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

  • Warm up for 5 minutes.
  • Turning screw L, we bring the engine to the highest speed in an unloaded state and return it back a quarter of a turn..
  • Hold the gas button with one hand for 15 seconds. At this time, we turn the H jet to the right until it stops and reaching the maximum speed. Then we turn it back one and a half turns, or until the “squeal” of the engine disappears.
  • With the throttle released, turn the idle screw (T) clockwise until the chain starts to move. After that, we rotate it in the opposite direction until the chain stops moving..

During the adjustment process, a situation may arise in which the chainsaw stalls. This may be due to excessively twisted jets, too rich or poor mixture..

If this happens, it is necessary to tighten the jets of the minimum and maximum speed until they stop. Then turn them back one and a half turns and try to start the saw.

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When does the carburetor of a Husqvarna chainsaw need adjustment?

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

  • increased idle speed;
  • strong smoke during tool operation;
  • Difficulty starting a cold or hot engine;
  • lack of traction and reduced maximum revs.

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

Husqvarna 240 Chain Saw – Carb Rebuild and Dissassembly

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

What is important to remember the consumer

Chainsaw “Huskvarna 240”, specifications which should help you make the right choice, after purchase, a fine-tuning file is required. In this case, we are talking about setting carburetor. It is also important to remember that this equipment does not have an oil flow control system for chain lubrication, but it often happens that the oil tank empties faster than the tank intended for the fuel mixture..

User’s manual

The manufacturer emphasizes that the saw should not be used until the chain has been treated with a sufficient amount of oil. Before starting work, you must read the instructions also because from it you can learn about safety measures during work.

For example, improper combination of chain and guide bar will increase the likelihood of kickback. But even if you read the manual, it is impossible to predict possible situations when using the saw, so the operator should be careful using common sense. It is necessary to use protective headphones, a special helmet, goggles and overalls during work.

User guide

Husqvarna 240 carburetor adjustment

The Husqvarna 240 chainsaw, whose technical properties you can see below, is the equipment that follows the Husqvarna 236 range. If we compare these 2 variations, then it should be emphasized that the latter has a higher power, a slightly longer tire and has an engine that allows you to save fuel up to 25%.

Chainsaw “Husqvarna 240”, which does not need to be repaired so often, is an environmentally friendly tool, which is very important for some consumers. The volume of harmful emissions into the atmosphere has been reduced, and the number of cuts per fuel filling has been increased. Quite often, the products of the above-mentioned Swedish company are associated with chainsaws from the Stihl manufacturer. As an advantage of the former, the presence of a primer should be emphasized to simplify the start-up. But, as practice indicates, this does not greatly affect the process of starting up the equipment..

Technical characteristics of the chainsaw “Husqvarna 240 16-3 / 8 9665112-26”

This model costs 13,000 rubles. and has an air purification system that reduces filter wear. The engine in the device is quite reliable and powerful, it contributes to economical fuel consumption, reducing the amount of harmful emissions. The chainsaw must be warmed up during starting. Once the cold tool is started, you must let it run for 30 seconds. Then you can use and release the throttle lever. This will prepare the tool for the job..

The “Husqvarna 240” chainsaw described in this section, the technical characteristics of which are of interest to you, has a tire of 40 cm, as well as a capacity of 2 liters. of. The engine power is 38.2 cm 3 and the fuel tank. 0.3 liters. Oil can be poured into the tank in the amount of 0.2 liters. Before purchasing this equipment, please note that it belongs to the household class and weighs 4.7 kg. The number of connections in the equipment is 56, the width of the slot. 1.3mm, but the noise level is 100.7dB.

Technical characteristics of the chainsaw “Husqvarna 240 16-3 / 8 9665112-26″

This model costs 13,000 rubles. and has an air purification system that reduces filter wear. The engine in the device is quite reliable and powerful, it contributes to economical fuel consumption, reducing harmful emissions. The chainsaw must be additionally warmed up when starting. Once the cold tool has started, let it run for 30 seconds. Then you can engage and release the throttle lever. This will prepare the instrument for work..

The “Husqvarna 240″ chainsaw described in this section, the technical characteristics of which should interest you, has a 40-cm tire, as well as a power of 2 liters. from. The volume of the engine is 38.2 cm 3. and the fuel tank holds 0.3 liters. It will be possible to pour oil into the tank in a volume of 0.2 liters. Before purchasing this equipment, you must take into account that it belongs to the household class and weighs 4.7 kg. The number of links in the equipment is 56, the groove width is 1.3 mm, but the noise level is 100.7 dB.

Chainsaw repair: checking the ignition system

Even the highest quality equipment sometimes requires repair. Chainsaw “Husqvarna 240”, the technical characteristics of which were mentioned above, is no exception. If a breakdown occurs, then first you need to inspect the spark plug, but before that, the wire is disconnected, and the spark plug is turned out with a special key. If it is dry, then the fuel mixture does not enter the cylinder. The malfunction in this case does not concern the ignition system..

Read more:  Setting The Chainsaw Carburetor.

2 years have passed since the purchase of the chainsaw, the working speed has “gone”, the official Husqvarna service in Saratov does not know how to set it up at all, so I decided to do it myself.

But I could not determine the speed of rotation from the frequency of sparking, I drank all the beer in the garage, but I still did not understand how to calculate, help?

Assembled an adjustment stand:

On the advice on the forums, I built a capacitive connection (having wrapped the signal probe around the handle, I didn’t really believe that it would work, however.)

I started the chainsaw, started to warm up: (frequency 510Hz)

The numbers were puzzling, but they are strictly logical and change strictly from the change in speed with the frequency of discrediting the frequency meter.
still warming up (frequency 520Hz):

After warming up, switched to idle (frequency 400Hz):

Working speed (frequency 13300Hz and 13700Hz):

According to logic, it is necessary to bring the frequency in hertz (times per second) in rpm, and since a 2-stroke engine, divide by 2.
So, how many did not divide, did not multiply – nonsense turns out.
In all, it turns out that the revolutions and frequency on the generator 1: 1 correspond and I adjusted it by ear correctly, but how can this be?

Upravdom wrote:
In all, it turns out that the revolutions and frequency on the generator 1: 1 correspond and by ear I adjusted correctly, but how can this be?

The engine is two-stroke, one spark per revolution – i.e. 1: 1. Maybe for measurement it was better to wind a little on the high-voltage wire using both tester probes on a coil around the BB wire? Singles are kind of like small 400-510-520. But the workers (as I understand the maximum), judging by the testimony of the tester, are 1330-1370 and not as you wrote 13300-13700. 1.33-1.37×1000 (1kHz = 1000Hz) = 1330-1370Hz.

rombel wrote:
judging by the testimony of the tester, we get 1330-1370

Multiply by 6, you get the revolutions – 1330×6 = 7980 rpm, 400×6 = 2400 rpm.

evgen36 wrote:
Multiply by 6, you get the revolutions – 1330×6 = 7980 rpm, 400×6 = 2400 rpm.

Whereas according to that forum, you need to multiply by 60 (to get rpm) because hertz are measured per second.

400×60 = 24000 and this is idle, this cannot be, but if you remove 0, you get 40X60 = 2400 rpm, this is slightly underestimated idle, the maximum is 133X60 = 7980 rpm.

evgen36 wrote:
400×60 = 24000 and these are blanks this cannot be,

What is the glitch I do not know, but

rombel wrote:
you need to multiply by 60 (to get rpm)

And you can fit any number to the desired result.

Veps25 wrote:
And you can fit any number to the desired result.

And I don’t adjust anything, if you count, then you need to count correctly.

evgen36 wrote:
400×60 = 24000 and this is idle, this cannot be, but if you remove 0, you get 40X60 = 2400 rpm, this is slightly underestimated idle, the maximum is 133X60 = 7980 rpm.

The measure of revolutions is revolutions / minute (in a minute 60 seconds, if anything), the measure of the frequency of the current is hertz of oscillations / second. So think for yourself, decide for yourself

rombel wrote:
And I don’t adjust anything, if you count, then you need to count correctly.

rombel. about “adjusting” I’m not for you, on the contrary, I agree with you that you need to count correctly, and not adjust the numbers, why evgen36. multiplied by 6, not 5 or 10? Just because in this case the result coincided with the desired one? But how, in this case, to be sure of the truth of the result?

Veps25 wrote:
about “customizing” I am not for you, on the contrary

I apologize, I misunderstood you.

I apologize for the delay in answering, giving rise to a lot of controversy..
I figured out such numbers, the problem was the neglect of the elementary rules of electrical engineering.
Of course, the tester’s input could not be turned into an antenna that caught not one, but several sparking harmonics..
The next day, I managed to connect to a motorcycle tachometer and on it I saw real and already similar to the truth revolutions:

3100 idle,

3900 warm-up and

11600 working revolutions.
But reality did not give me rest on what I had achieved – when I tried to saw a log already on

In the 2nd minute, the saw stopped developing the working power, I was already finishing it by constantly accelerating it with the throttle handle – a small cut – a drop in revolutions and again acceleration by playing the gas hand.
Some time ago, I would have gladly got to the bottom of the root cause myself, disassembling, “sounding” the carburetor and rinsing it wherever possible, but I decided to trust the professionals, giving it to me for repairs, which my friends advised me, seeing my torment and howling of the chainsaw.