Stihl Chainsaw Under Stall Causes

Chainsaw starts and stalls, cause

A chainsaw has long been not a luxury, but a necessary tool for anyone who has at least some suburban area. With its help, you can carry out gardening, harvesting firewood, finalizing lumber and much more. There are a lot of chainsaw models on sale, differing in both power and overall quality of performance. You can verify this here.

However, any technique can be moody, and chainsaws are no exception. Consider the most common problems.

The tool stalls immediately after starting

One possible reason is lack of fuel. Check the amount of fuel in the gas tank, and add if necessary. In this case, you should strictly follow the recommendations of the instructions, especially regarding the quality of gasoline and oil. We often ignore such subtleties, refueling the saw as necessary, which causes accelerated engine wear and leads to failures.

Also, the saw may stall due to deterioration of the contact of the spark plug with the high-voltage wire. This can be caused by mechanical shear or carbon deposits. Sometimes it is recommended to periodically replace the candle with a new one, even if the old one did not show any problems in operation.

A chainsaw can work normally, being in a straight horizontal position, but stalls with lateral inclinations. As a rule, this is also associated with a shortage of fuel: the fuel pipe rises when tilted, and if there is little fuel, it rises above the fuel level.

Chainsaw idles

Firstly, it is recommended to check the muffler, as its pollution can lead to deterioration of the exhaust gas output, because of which the engine stops.

If cleaning the muffler did not solve the problem, and the engine of your saw is carbureted, then you can try to configure it. Most engine models have coarse and fine adjustment bolts (H and L, respectively). By increasing their speed the engine can eliminate the problem. Keep in mind that adjusting the carburetor is a rather delicate process that requires the use of a tachometer.

Engine does not withstand loads

If the chainsaw stops just in the middle of a particularly thick log, then the problem can be caused by malfunctions in the fuel supply system or problems with the air filter. The engine simply does not receive enough combustible mixture to work with a heavy load, and stops.

The usual solutions to these problems are replacing the fuel in strict accordance with the recommendations in the instructions (we already talked about this) and cleaning (replacing) the air filter.

Chainsaw stalls with increasing speed

The reasons for this phenomenon are similar to the previous ones: either the problem is in the fuel system or in the air filter. Try to disconnect the fuel hose from the carburetor. if gasoline does not flow well (but you know for sure that there is fuel in the tank), then the reason is in the gasoline filter. You can, at the same time, check the fuel pump. fuel should not leak through it. If this happens, then it is advisable to replace the pump.

Why does the chainsaw stall

There are several reasons why a chainsaw stalls. And, as a rule, almost all of them can be solved independently, without going to the service center.

First of all, check the filters: fuel and air. If they are clogged, then, for sure, this is the reason for the incorrect operation of the tool. over, the dirt is not always visible to the naked eye. Therefore, even if it seems that everything is in order, it is better to carry out this procedure.

The second reason, perhaps in the candle. Remember when you last changed it? According to the rules for operating chainsaws, this should be done once a year.

If this does not help, then it is worth trying to adjust the carburetor. Perhaps due to vibration when working with a chainsaw, its factory settings were lost.

If the saw stalls after prolonged storage, for example, in an unheated garage, then it is worth looking at the fuel line. Usually, this is a rubber tube, which, due to dampness and temperature difference, can crack and cause a malfunction of the chainsaw.

If none of the above helped, then most likely the damage is more serious, and, unfortunately, you will have to go to the workshop.

What to do if a chainsaw stalls?

  • The car stalls at idle: possible causes
  • Malfunctions of the fuel and air filters and their elimination
  • Problems with a spark plug and methods for solving them
  • Substandard carburetor operation
  • Problems Related to Fuel Malfunctioning
  • Idle problems due to muffler malfunction
  • Piston cylinder malfunctions

Builders, installers, rescuers and summer residents # 8211, all of them sooner or later, carrying out their tasks, take on a chainsaw. And the final result of their activity depends on how reliable this tool will work.

Stihl Chainsaw Under Stall Causes

A chainsaw is used to cut wood.

It is worth noting that the chainsaw belongs to relatively simple devices. Nevertheless, it, like other mechanisms, periodically fails. When the chainsaw stalls while idling (this is one of the most common malfunctions), the biggest problem # 8211 is to determine the causes of this behavior of the device. If the source of the “disease” is correctly established, it will not be so difficult to return the device to a working position.

Therefore, the first step is to find out what kind of malfunctions a chainsaw is and what leads to engine shutdowns at idle.

The car stalls at idle: possible causes

In order to answer the question of why the saw, periodically acting up, stalls idling, it must be borne in mind that the basis of this tool is an ordinary two-stroke internal combustion engine.

It follows that various problems with the main components of any internal combustion engine lead to malfunctions: fuels and lubricants, ignition system, air-fuel mixture quality and compression inside the cylinder.

The main engine malfunctions include the following:

  • the engine does not start
  • starts up, but, working unstably, quickly stalls at idle
  • The chainsaw is idling normally, but stalls under load.

The reasons for idle violations can be different. But all of them can be reduced to several common positions. So, problems such as:

Internal combustion engine chainsaw.

possible clogging of the fuel and air filter

  • defect or malfunction of the spark plug
  • violation in the initial settings of the carburetor caused by strong vibrations during the operation of the mechanism
  • gas line defects
  • incorrect ratio of ingredients in the "fuel mixture"
  • silencer pollution
  • malfunctions of the cylinder-piston group.
  • Video: Stihl Chainsaw Under Stall Causes

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    Malfunctions of the fuel and air filters and their elimination

    The chainsaw is muffled at idle if the fuel or air filter becomes clogged. To find out the state of the first element of the fuel system, disconnect the gas line from the carburetor. If fuel is pumped in at doses that match the specified standards, then the cause of the malfunction should be sought elsewhere. If gasoline comes to the carburetor weakly or does not flow out of the hose at all, then most likely the filter is clogged with garbage.

    For cleaning, it is removed from the tank (all fuel must be drained from the tank until this point). Extraction occurs through the filler neck of the tank using a wire hook. The filter is disconnected from the suction hose. If possible, clean the filter. If this is not possible or it is impractical to do this for several reasons, the used filter is replaced with a new one.

    The chainsaw may muffle if the fuel filter is clogged.

    The air filter can also be clogged with dirt or dust, which leads to malfunctions at idle. It should be remembered that clogging of this filter occurs quite often, as a result of which air intake into the system is difficult. In the fuel-air mixture, the proportion of gasoline increases, and it turns out to be excessively enriched. Normal operation of the engine in this case can not be expected.

    For cleaning, the air filter is removed with special care so as not to dust off the carburetor. Then it is cleaned and washed thoroughly. Detergent is added to the wash water. After drying, the air filter returns to its place in the chainsaw.

    For normal operation of the cutting tool, it is recommended to change the fuel and air filters every 3 months.

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    Problems with a spark plug and methods for solving them

    Usually, this key component of the ignition system is recommended to be changed at least once a year. But often the owners of the saws forget about this rule. And therefore one should not be surprised that the apparatus, whose maintenance is carried out fragmentarily, as a result, poorly "holds" idle speeds.

    The chainsaw spark plug must be changed once a year.

    Therefore, you should pay attention to the following malfunctions associated with the operation of this system:

    1. Filling candles with gas at the time of start. To eliminate the problem, turn out the candle and, without calcining, dry it. Excess gasoline is drained from the engine through a hole-socket into which the candle is screwed. After a break of 30 minutes, the candle is put in place, the mechanism starts.
    2. No spark due to poor contact between the tip of the plug and the high voltage wire. The connection is checked, if the violation is defective eliminated.
    3. There is no spark due to a malfunction of the electronic ignition unit. If there is confidence in the reliability of the connection of the tip with the high-voltage wire, but there is still no spark when the starter is switched on, then the cause of the breakdown may be a malfunction of the ignition unit. This component is not restored, it is only replaced with a new one.
    4. Incorrect clearance between spark plug electrodes. In different types of candles, this indicator ranges from 0.2 to 0.5 mm. The correct clearance is set using a feeler gauge of the appropriate thickness. Greater or lesser clearance for a given type of candles is not allowed.

    Meanwhile, during the initial inspection of the spark plug, it may turn out that the reason the chainsaw refuses to work is not at all caused by defects in the spark plug or other elements of the ignition system.

    Spark plugs can tell about malfunction of a saw.

    So, if the candle turns out to be completely dry, this may mean that the initial problem lies in the impossibility of fuel entering the combustion chamber. In this case, you should check the entire gas supply circuit from the carburetor itself.

    At the same time, the presence on the candle body of a characteristic black soot # 8211 is a sign that the carburetor is probably poorly adjusted. Because of this, the fuel mixture is oversaturated with gasoline. Oil may have fallen into the fuel. In this case, clean the spark plug, replace the fuel and adjust the carburetor.

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    Substandard carburetor operation

    If it turns out experimentally: the filters are clean and the ignition system is not to blame for the fact that the chainsaw is not able to function at idle, it is recommended that the tool owner turn his attention to the carburetor.

    It is necessary to disassemble and assemble the carburetor without haste, since there are many parts in it without which it will not be able to work.

    Often unstable operation leads to deregulation of this unit, which is responsible for supplying a certain volume of air-fuel mixture to the engine cylinder. You can adjust it with three special screws located on the carburetor: maximum and minimum speed screws, as well as a screw that controls idle speed.

    Some manufacturers, fearing unwanted interference from incompetent people, supply their products with just one idle screw. But in both cases, the carburetor can be adjusted only by precisely following all the manufacturer’s instructions.

    However, after adjusting the carburetor, in accordance with the factory standards, this unit can junk. Then it is recommended to clean the fuel and air channels, jets, the mesh of the filter element. If the membrane is damaged, it must be replaced with a new and high-quality one.

    When servicing and repairing a carburetor, you should always remember that it is usually crammed with a lot of very small parts, without which the device will simply not be able to work normally. Therefore, disassemble and assemble the carburetor should be without haste and with extreme caution.

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    Problems Related to Fuel Malfunctioning

    The chainsaw periodically stalls idling also due to a violation of the integrity of the fuel line or an incorrect ratio of the ingredients of the “fuel mixture” consisting of gasoline and oil.

    Before each switching on of the cutting mechanism, it is necessary to visually inspect its blocks and units, paying attention to possible defects in the surface of the body, mechanical damage, and leaks of working fluids. This should be done with regard to the fuel line of the saw, which is usually a rubber tube.

    If the device was (especially a long time) in a damp place and it had to withstand sharp fluctuations in air temperature, this tube could simply crack. Such a fuel line is not suitable for further use and should be replaced.

    Another reason why the chainsaw at idle may stall is the non-compliance of the ratio of ingredients in the preparation of the “fuel mixture”. The proportions of the gasoline and oil included in it must exactly correspond to the proprietary instructions for a particular device. If they are not observed, the engine will not be lubricated sufficiently, and the entire mechanism will persistently stall.

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    Idle problems due to muffler malfunction

    In the event of a noticeable drop in the power of the internal combustion engine at idle, after which the car often stalls, it is necessary to remember to check the muffler. The fact is that this node can turn out to be heavily clogged with tarry particles and the products of combustion of the spark extinguisher, falling on the walls of the muffler in the form of thick deposits.

    As a result, the resulting impermeable layer interferes with the normal exhaust emissions. This situation must certainly be corrected. A simple repair of a clogged muffler is carried out as follows.

    Cleaning the muffler with a dry cloth is not allowed, as carcinogenic soot particles can enter the respiratory tract.

    The silencer is removed from the engine, disassembled (if this type of silencer can be disassembled). In this case, it is necessary to plug the remaining openings from under the muffler.

    The entire assembly and its individual parts are thoroughly washed with a rag soaked in water with detergents. If the muffler is collapsible, they are waiting for all its parts to dry completely. The fixed unit is dried with an ordinary household hair dryer. Cleaning this appliance with a dry rag is not allowed, otherwise the carcinogenic particles that form carbon deposits can get into the respiratory tract.

    As a preventive measure for the normal functioning of the silencer of two-stroke ICE in the “fuel mixture” of chainsaws, it is recommended to use only high-quality oil and only that prescribed by the manufacturer of this unit.

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    Piston cylinder malfunctions

    It is possible that after eliminating all of the listed causes of malfunctions, the chainsaw will continue to stall at idle or not start at all. In this case, you will have to look into the very heart of the engine # 8211 its cylinder.

    Sometimes even a visual inspection is enough to determine what is happening with the cylinder-piston group. Chips, seizures, obvious cylinder wear and other visible defects # 8211 are immediate obstacles to the normal operation of the device. Without a doubt, such parts must be replaced.

    If there is no obvious damage, then you need to examine the piston rings. It is damage to these rings that lead to loss of engine power. Too freely running rings in the grooves of the cylinder suggests that it is time to change these spare parts for new ones.

    Meanwhile, a complete picture of the technical condition of this group of parts can be made only after a complete analysis of the engine. Since this is a laborious, responsible business that requires a certain professional experience, it is better to entrust it to a specialist. This is the only way to extend the working age of the great helper person # 8211 chainsaws.