Adjusting the carburetor of the Husqvarna 240 chainsaw

Factory settings

The factory default setting for the Husqvarna carburetor is the position of the screws (H) and (L), in which a working chain saw is guaranteed to start. For Husqvarna tools, this is one and a half turns from fully tightened screws (H) and (L). In the process of adjustment, you must first set the screws to the standard position, then start the chainsaw and make precise adjustments to the power, the number of maximum revolutions and idle speed.

What is important for the consumer to remember

Chainsaw “Husqvarna 240”, the technical properties of which should help you make the right choice, after purchase asks for fine tuning with ratfil. 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.

How to understand that everything is done correctly

After setting up, you need to start the chainsaw. Check the stability of idling. In this case, the chain must not move. When you press the accelerator, the chainsaw should accelerate steadily and stop without delay.

At minimum and maximum rpm, the Husqvarna 350 should run stably, free of extraneous noise. At the time of operation, there should be no sharp loss of power or shutdown.

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 manufacturer Stihl. As an advantage of the former, the presence of a primer should be highlighted to simplify the start-up. But, as practice indicates, this does not greatly affect the process of starting up the equipment.

Husqvarna 240. And again about the carburetor. Design blooper or what it is?

Chainsaw Husqvarna 240 carburetor problem One of the most common diseases of this chainsaw. Excellent

Algorithm and description of setting the carburetor Husqvarna

Husqvarna carburetor, adjustable in the same way as carburetor settings on other brands of chainsaws.

Immediately before adjusting, it is necessary to carry out a complete diagnosis of the saw and make sure that there is no difficulty in supplying fuel and air leaks into the crankcase of the chainsaw. It is also necessary to make sure that the air filter is clean and, if necessary, replace it with a new one.

The order of work is as follows:

  • Saw muffled with Husqvarna carburetor factory setting.
  • The engine starts and the saw warms up for a few minutes.
  • By turning the screw (L) clockwise, the position is found at which the engine develops maximum speed, after which the screw must be unscrewed 1⁄4 back. If at the same time the chain of the chainsaw rotates, then it is necessary to reduce the idle speed by adjusting the position of the screw (T).
  • The next stage is adjusting the power of Husqvarna at maximum speed and adjusting their number. To do this, the tachometer is connected to a running chainsaw, the throttle knob is squeezed out to full, after which the tachometer readings are checked. If the value of the maximum speed differs from the maximum number recommended by the manufacturer, then by changing the position of the screw (H), the tachometer readings are returned to normal.
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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 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 fill in oil in 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.

How to remove the carburetor and whether to do it before tuning

In the event that the chainsaw does not develop speed or, on the contrary, works at excessively high, the carburetor can be adjusted without removing.

But if the chainsaw does not start, the rpm freezes at the same level or it is unstable. Chainsaw carburetor tuning will not change the situation. It must be removed to clean or replace parts. In this case, it is necessary to act in the following order:

  • Having unscrewed the retaining fasteners, remove the upper saw casing.
  • We remove the gasket and part of the air filter by unscrewing the bolts or snapping off the fasteners.
  • There is a fuel hose on the right side of the carburetor. We remove it together with the air damper control rod.
  • Remove the carburetor from the mounts that hold it.

Disassembly of the carburetor is carried out in accordance with the instructions supplied with the kit. When disassembling, be very careful when folding the parts onto the prepared fabric. Due to the small size, there is a risk of losing components during disassembly and flushing.

All parts obtained in this way are washed in a special liquid, dried and wiped with a lint-free cloth.

Channels, tubes and nozzles are blown out with compressed air, if possible, after rinsing them in an ultrasonic bath.

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 a 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, the quality and quantity of the fuel mixture is adjusted after an overhaul of the engine or in the process of scheduled maintenance of the chainsaw.

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

How to adjust the carburetor on a Husqvarna 240 chainsaw?

Any technique is subject to breakdowns from time to time. The main malfunctions of the Husqvarna 240 chainsaw are associated with the repair of the carburetor, other components of the fuel system, and malfunctions of the oil pump. If the oil pump breaks down, the chain for the Husqvarna 240 chainsaw stops rotating due to lack of lubrication. Also, damage to the gas tank or fuel hoses can be the reason why gas is leaking out of the saw. If the saw has completely stopped starting, first of all you should make sure of the quality of the fuel mixture, check the spark plug spark. If necessary, clean the spark plug or replace it with a new one, adjust the carburetor.

Carburetor adjustment is also required in cases where the chainsaw began to start poorly, stall under load, and also if the type of fuel or operating conditions have changed. It is worth adjusting the carburetor after pre-cleaning the air filters and warming up the engine.

Then proceed according to the following algorithm:

adjusting, carburetor, husqvarna, chainsaw
  • Screw L turns to the maximum. Then immediately return the screw a quarter of a turn back.
  • While holding the throttle grip, turn screw H a quarter of a turn.
  • Release throttle and turn screw T clockwise until the chain starts moving. Then immediately turn the screw back until the chain stops.

The location of the corresponding screws is shown below:

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.

Husqvarna 240. And again about the carburetor. Design blooper or what it is?

Carburetor for Husqvarna Chainsaw Husqvarna 240 carburetor problem. One of the most.

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Tools required for work

Before proceeding with the tuning of the Husqvarna carburetor, you need to take care of having all the tools that may come in handy. To carry out this type of work yourself, you will need:

A regular slotted screwdriver will not work for adjustment, as the adjusting screws on Husqvarna chainsaws may have different cross-sections. You will have to purchase a special, this is a feature of repairing Husqvarna chainsaws, they did everything so that the saw could be repaired only in a specialized Husqvarna service.

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.

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

How To Adjust / Tune a Chainsaw Carburetor | Husqvarna Stihl BEST Way

But this list of consumers is not considered complete. They love the presence of a brake lever in the model, it attracts both the ergonomic design, the low exhaust volume and the chain tensioner.

User guide

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 the low rpm, the other is for adjusting the upper rpm, while the third is used for adjusting the 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.

Husgvarna 240 chainsaw carburetor repair

This video shows a common cause of a malfunction on chainsaws with an accelerator pump. Be ATTENTION

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 there is a breakdown, 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.

2 years have passed since the purchase of the chainsaw, “gone” working speed, 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?

Chainsaw Won’t Start. What To Look For & How To Fix. (Husqvarna Carburetor Cleaning)

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. delirium turns out.
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?

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.

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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 on 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 “adjust” 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 “adjust” I’m 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 in 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, “having sounded” the carburetor and rinsing it wherever possible, but decided to trust the professionals, giving it to the repair, which my acquaintances advised me, seeing my torment and howling of the chainsaw.

User guide

Husqvarna 240. And again about the carburetor. Design blooper or what it is?

Carburetor for Husqvarna Chainsaw Husqvarna 240 carburetor problem. One of the most.

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, and because of this you can learn about safety measures at work.

For example, if you align the chain and bar incorrectly, it will increase the chance of kickback. But even if you read the manual, it is impossible to anticipate possible situations when operating the saw, so the operator must be careful using common sense. When working, you need protective headphones, a special helmet, goggles and overalls.

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.