Troubleshooting yourself
If it is impossible to start the engine, it is necessary, observing the order, to perform the following actions:
Location of the air filter and spark plug.
- Check the presence of gasoline in the tank.
- Replace fuel if it has been stored for more than a month.
- Check the fuel filter. Disconnect the hose from the carburetor and observe the stream that flows out. If gasoline flows freely, the fuel filter is not clogged. If the flow rate is insufficient, clean the hole in the tank cap or filter.
- Clean the air filter. The air filter can be removed for a test run.
- Inspect and clean the muffler from burning.
- Check the functionality of the launcher. If necessary, repair the starter (replace the pulley, spring or cable).
- Disassemble and clean the clogged carburetor.
- Test the high-voltage wire with a tester to ensure there is no break.
- Measure the gap between the flywheel magnets and the ignition module (should be 0.2 mm).
- Unscrew the spark plug and inspect it. Measure the gap between the electrodes with a feeler gauge (normally 0.5-0.6 mm). Based on the appearance of the electrodes, we determine the nature of the malfunction. If the spark plug is dry, there is no supply of working mixture. A working part flooded with gasoline indicates poor carburetor adjustment or lack of spark. To check for spark, connect the high voltage tip to the spark plug, place the skirt on the cylinder radiator and pull the starter cord. If there is no discharge between the electrodes, the spark plug must be replaced. The formation of carbon deposits on the electrodes indicates a poor quality of the fuel mixture. The central and side electrodes should be cleaned with sandpaper.
- No compression. The reason is failure of the piston group. Measure compression. First you need to unscrew the spark plug. Then insert the pressure gauge into the cylinder bore and use the starter cord to move the piston. The state of the cylinder-piston group (CPG) is judged by the pressure in the cylinder. It must be at least 8 atm. Low performance is caused by wear of the cylinder, piston, and piston rings.
Starter repair
The starter is responsible for starting the unit. Malfunctions indicate the presence of the following malfunctions:
- the spring burst;
- the pulley is damaged;
- The starting cable is damaged.
Sequence of actions for replacing a worn starter cord:
- the starter is disassembled, the mechanism is removed, having first unscrewed the screws securing the housing to the engine crankcase;
- the cord is pulled out at a distance of 30 cm through the hole in the pulley;
- the return spring is set to the neutral position;
- the central screw is unscrewed and the pulley itself is removed;
- a new cord is inserted, tensioned, while 3 turns are wound around the mechanism and secured with a screw;
- the cord is then pulled through a groove in the starter housing and handle.
The return spring is tensioned by rotating 2 turns clockwise, taking into account that it is compressed. When replacing a broken part, the spring should pop out after pulling the inner part down.
Why does the chainsaw stall?
If the chainsaw starts and stalls, the reasons may be different. An external inspection should be carried out before attempting to repair the instrument.
If the saw stalls during operation, you should check the presence of a mixture of oil and gasoline in the tank. If the fuel mixture runs out, the device will not work. In situations where there is still gasoline left, you should evaluate the quality of the tool before turning it off. The appearance of extraneous sounds and the subsequent sudden stop should alert you.
The formation of carbon deposits on the electrodes can also cause difficulties in the operation of the tool. You should carefully inspect the device and clean it if necessary.
When you press the gas
In cases where the chainsaw stalls when you press the gas, you should check the muffler and fuel filter. A possible cause of the problem is a leak in the fuel hoses. In some cases, adding speed helps.
Sometimes checking all the details does not give results, the tool suffocates, chokes when gas is added. If the device stalls when a person presses the gas, it is possible that the fuel supply is insufficient for normal operation. This phenomenon occurs due to a clogged carburetor or filter.
Damage can also occur due to the air filter becoming clogged with dust. When you give gas, the device stops working. You should not fix the problem yourself, since each model has individual characteristics.
The problem may be caused by insufficient or lack of lubrication on the chainsaw chain. If the chain is dry, you should clean the channels through which oil is supplied to the device bus. If the oil leaks, there are cracks and defects in the pipes, they need to be treated with sealant.
Under load
In situations where the device stalls under load, the problem may be with the gas tank or filters. Check the fuel quality and change the filter.
Often the saw does not gain speed due to the fact that the mixture poured into the gas tank has a low octane number. There is not enough power, sufficient heating is not possible, the chainsaw stalls under load.
Often, malfunctions of components lead to the device stalling under load. Hoses, seals, and gaskets should be checked for leaks. If parts are faulty, you can try to repair or replace them.
In cases where the chainsaw starts and immediately stalls, there is not enough fuel, the device does not heat up. The device must be recharged
It is important to use the correct mixture. Different types of fuel are better suited for different models. It is necessary to read the instructions, recommendations, reviews of people for whom the device works normally
It is necessary to read the instructions, recommendations, reviews of people for whom the device works normally.
Idling
In situations where the chainsaw stalls at idle, you need to inspect the condition of the muffler. If the part is dirty, exhaust gases are poorly removed, the engine cannot continue to work and stops.
The saw stalls at idle and in cases where the carburetor is not configured correctly. For beginners, it is better to entrust the repair to specialists, since there is a possibility of incorrect settings, due to which the tool will not be able to work. A tachometer is required to adjust the carburetor.
At high speeds
If the device stalls at high speeds, pay attention to the condition of the gasoline and air filters, the serviceability of the fuel hoses
A dirty air filter can be washed under warm running water.
It is important to thoroughly dry the part before installing it so that water does not damage the serviceability of the tool.
If fluid stops flowing through the fuel hose, it is clogged. You can clean the part or replace it with a new one.
In cases where the saw stalls at high speeds, but the liquid completely flows through the hose, and the air filter is clean and in good working order, look for the cause of the breakdown in the fuel filter. Replace it with a new one or clean it.
In some cases, the problem is hidden in the gasoline pump. When a component wears out, fuel begins to leak through the walls. If this phenomenon is observed, a new pump should be installed.
When tilted
If the saw does not develop speed when tilting, turns off, or stops working, you need to check the fuel level in the tank. If it is not too high, the device in an inclined position is not supplied with sufficient fuel, since the fuel pipe is above the mixture level.
Scope of application
The manufacturer recommends using Husqvarna 240 9673260 01 to solve simple problems. For example, this is work on caring for a garden plot or preparing firewood for individual heating. This model is also suitable for outdoor enthusiasts who need to make tables and benches from wood while traveling, as well as cut wood for a fire.
The engine life of the engine installed on this saw model does not allow it to be used for daily work in an eight-hour working day. Simply put, if you use this saw every day, the piston group will wear out quickly and require repair.
To increase the service life of the piston group, it is necessary to use only original oils manufactured by Husqvarna.
Repairing a piston is quite an expensive task, and it is for this reason that if there is a need to work with a saw every day, then it is better to choose a chainsaw from the professional or semi-professional series. Chainsaw Husqvarna 240 is a household model.
Cleaning and adjusting the carburetor
If all of the above does not help, then, most likely, the carburetor needs to be adjusted or cleaned. It is not recommended to do these procedures yourself, since most often such attempts still end in a trip to the service center. So it’s better to go there right away and not disassemble anything yourself. But if you still want to dig deeper yourself, then it’s best to watch a video that shows how experts do it:
Using a chainsaw makes difficult work easier. But sometimes the chainsaw starts and stalls, the reason for this could be any. What to do? You have to choose: take it to a specialist workshop or try to repair it yourself. We will try to help the reader understand the reasons for the failure, how to eliminate breakdowns, and give advice on operating chainsaws. In turn, it will be useful for the owner to familiarize himself with the factory operating instructions and design features of his chainsaw. This information will help him competently use and professionally repair the tool.
Circuit diagram of a chainsaw.
What to do if the chainsaw continues to not start?
If the initial inspection did not yield anything or the defects were eliminated during the search process, but the chainsaw still does not start, then you need to look for more serious reasons. It is best to identify and repair such breakdowns at a service center. However, if you have experience, you can find and eliminate them yourself. What to diagnose and check?
- Compression in the cylinder;
- Compression in the crankcase;
- Carburetor operation.
In the first case, checking the compression in the cylinder will allow you to find out the condition of the cylinder-piston group (CPG) of a chainsaw that does not want to start when cold. To do this you need a compression gauge. The device is screwed into place of the spark plug and the engine is started idle. Measuring the readings allows you to judge the condition of the CPG. In the absence of a compression gauge, you can determine the compression in the cylinder offhand as follows:
- Place your finger on the spark plug hole;
- Try to start the chainsaw engine.
By placing your finger on the spark plug hole and pulling the starter, you can check the compression in the cylinder
If you feel that your finger is being pulled strongly into the spark plug channel, then everything is in order with compression. The absence of vacuum in the chamber indicates a malfunction. The cylinder-piston group needs a more detailed inspection, which will give an idea of the condition of the piston and cylinder, piston rings and bearings.
A chainsaw may not start when cold due to a lack of compression in the engine crankcase. The main reason for this is damage to the gasket located between the cylinder and the crankcase. It is quite easy to detect a lack of compression:
- Disconnect the upper tube from the carburetor;
- Pour gasoline into a regular cork;
- We immerse the removed tube in the fuel;
- We pull the starter several times.
If fuel is sucked out of the cap when the chainsaw starter starts, then everything is fine with compression. If not, look at the gasket.
If the fuel is drawn in, then everything is fine - the gasket is intact. Otherwise, you will have to purchase a repair kit and make a replacement. How to do this, watch the video why a Chinese chainsaw won’t start:
Starting the tool may be complicated by improper operation of the carburetor or its breakdown. It often happens that during the sawing process the fastening screws become loose and air is sucked into the cylinder. Check that the carburetor is securely fastened. Inspect it for fuel leaks. There can be many reasons for the malfunction. It is possible to accurately determine the malfunction, eliminate it and fine-tune the carburetor only at a service center.
After going through a step-by-step troubleshooting of the chainsaw engine, you will be able to find the malfunction, fix it yourself and successfully start your working tool. Do not take on types of work that you are not confident in. Entrust troubleshooting and troubleshooting to specialists from the service center.
Every person who is familiar with gas-powered tools knows that sometimes the equipment works intermittently, or may stall at one point and not start again. There are many reasons why a chainsaw does not start; we will try to consider the most common of them.
Summing up
When the first signs of improper operation of the chainsaw appear, a full diagnosis should be carried out. To avoid damage to the saw due to improper maintenance, it is better to entrust the work of identifying and eliminating engine malfunctions to professionals. And most importantly, you should not use a chainsaw with minor defects, as this will lead to even bigger problems.
There are several different reasons why a chainsaw will not start: the device may be faulty, there may be a lack of sufficient fuel or an interruption in its supply. Often the problem can be fixed manually. In some cases, specialist help may be needed.
Why does the Shtil chainsaw not start when it's hot? Why does a chainsaw have trouble starting?
Main reasons:
- fuel and air filters;
- reduced compression;
- carburetor adjustment;
- spark plug;
- ignition coil;
- gap between the ignition coil and the flywheel;
Let's look at each reason in more detail.
Fuel and air filter
Contamination of the main filter elements of a chainsaw negatively affects its operation.
For example, a dirty air filter will not provide enough air to the carburetor, which will affect the quality of the air-fuel mixture and normal engine starting. A dirty fuel filter will make it difficult or even cut off the flow of gasoline to the carburetor and make it impossible for the engine to operate.
Reduced compression
One of the common cases of difficult starting of a chainsaw is wear of the CPG (cylinder-piston group).
As you know, for a chainsaw to start normally, compression must be present in its engine. It is necessary for normal compression of the fuel mixture in the engine cylinder, and it also affects the operation of the fuel pump.
During the operation of the tool, the compression value drops and the chainsaw begins to have difficulty starting.
The reasons for the lack of compression or its decrease may be natural, because The engine wears out during operation. Problems can also be caused by a serious breakdown, for example, a scuffed CPG, or a broken piston ring.
A sign of low compression is weak starter resistance when starting. With reduced compression, a decrease in the power of the chainsaw is observed, which negatively affects its performance. The problem is eliminated by replacing the piston rings, or the entire CPG.
Carburetor adjustment
Incorrect carburetor adjustment will cause the chainsaw to not develop full power. It will be difficult to start, or not start at all. Carburetor settings directly affect the quality of the air-fuel mixture, which is necessary for normal starting and further operation of the engine.
If the carburetor is incorrectly adjusted, there will be more or less gasoline in the fuel-air mixture than required, and the mixture will not ignite even with normal sparking.
Excess gasoline in the mixture is usually called overflow. A characteristic sign of overflow is a wet spark plug, after several unsuccessful attempts to start the chainsaw.
Spark plug
The spark plug is one of the main elements of the ignition system. A spark is formed at its electrodes, and if this element fails, starting will be difficult or not possible at all.
The spark plug may fail completely, or work intermittently or produce a weak spark. Checking the spark plug is quite simple; to do this, you need to unscrew it from the engine, attach it to the cap of the high-voltage wire and, placing it on the cylinder, pull the starter. If the spark plug is in order, the spark will be powerful with a bluish tint. A weak spark with a reddish tint is a sign of a problem. A defective spark plug needs to be replaced.
Ignition coil
The reason that a new chainsaw does not start, or starts poorly, may be the ignition coil. Modern chainsaws are equipped with electronic ignition coils. This part cannot be repaired, and, as a rule, if there is a defect, it is completely replaced.
Husqvarna saw disassembly algorithm
The process of disassembling a Husqvarna chainsaw is quite simple. In order to do everything correctly and not break parts of the housing or CPG, it is necessary to disassemble in the following order:
- Top cover.
- Chain and saw brake cover.
- Starter.
- Flywheel and clutch.
- Front handle.
- Carburetor.
- Oil pump.
- Engine.
Depending on the Husqvarna model, the disassembly procedure may vary slightly.
Important: before you start disassembling the chainsaw, you need to clean it. When working with a saw, a lot of chips and wood dust are generated, which during disassembly can get into the internal parts of the Husqvarna chainsaw
Removing the side cover and saw set
The side cover, or also called the saw chain brake cover, is held in place with two thirteen nuts.
After unscrewing the nuts, the cover is removed from the guide pins, after which you can remove the bar and chain from the chainsaw. Some models of Husqvarna saws have a special mechanism installed that allows you to dismantle the cover and saw set without the help of special tools.
Starter
The starter is located on the right side of the Husqvarna and is held in place by several screws. By unscrewing them, you can easily remove the starter and thereby gain access to the flywheel and ignition coil.
