Chainsaw Huter starts and stalls

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Why does the chainsaw start and immediately stall

The chainsaw starts up and immediately stalls, the reason for this behavior may be hidden in the carburetor. A malfunctioning fuel pump or malfunctioning of the main fuel jet can cause this saw to behave like this. The inability to operate the chainsaw after starting, requires a full diagnosis at the service center.

All of the above options for engine malfunction have similar causes, which, depending on their neglect, can have different manifestations. For example, with a slight intake of air into the crankcase of the engine, its work will not change much, the engine power will drop slightly, its maximum speed will increase, and it will be able to heat up a little more. In the middle stages of air leakage, the engine will stop idling and will get very hot during operation. Strong air suction, will make it impossible for the saw to work, it will start and immediately stall.

In parallel with the visible manifestations of malfunctions, for example, the inoperability of the chainsaw after starting, processes will take place inside the engine at the time of its malfunctioning, which irreversibly lead the saw to the most serious consequences, for example, melting the piston, jamming the crankshaft.

The chainsaw starts and stalls cause

Owners of chainsaws sometimes have to deal with the fact that the saw, for no apparent reason, stops working normally. To understand why the chainsaw stalls under various operating modes, and also to describe how you can diagnose a malfunction, we will try in our article.

  • Why does a chainsaw stall when heated
  • Why does a chainsaw stall under load
  • Why the chainsaw doesn’t pick up speed and stalls
  • Algorithm for checking the crankcase for leaks
  • Why does the chainsaw start and immediately stall
  • Malfunctions leading to improper operation of the chainsaw
  • Summing up

Why does a chainsaw stall when heated

The situation in which a chainsaw starts up cold, and in the process of heating it can stall, is familiar to many who deal with them. The main reasons for this behavior of the saw are as follows.

Stihl MS290 Dying At Full Throttle

  • Defective ignition module (coil). Determine the malfunction by checking the spark first on a cold engine, and then on a hot one. If there is no spark on a hot engine, then it is worth trying to fix the malfunction by replacing the ignition coil.
  • The carburetor of the chainsaw has an incorrect setting (fills a hot candle). You can determine the problem by how the saw is started on a cold one. If for a cold start it is not required to close the air damper, and the engine starts without a preliminary flash, then the fuel mixture is formed incorrectly and after the engine warms up, the fuel fills the spark plug and makes it impossible to start. The problem is eliminated by adjusting the carburetor.
  • Spark plug defective. In such a situation, similar to a faulty ignition coil, the spark disappears when the engine heats up. It is worth trying to replace the spark plug with a new one, and if this does not help, then you need to check the ignition coil and the gap between it and the flywheel.

You can check the ignition coil using a multimeter or by replacing it with a known good one. The test with a multimeter of the primary and secondary windings is carried out in the resistance measurement mode. The resistance index of the primary winding, working coil, is 1 kOhm. secondary 4 kOhm.

Why the chainsaw doesn’t pick up speed and stalls

If the chainsaw is not able to pick up speed a minute after starting or stalls when the gas trigger is pressed, most likely the carburetor or crankcase is leaking. As in the previous case, the problem can be solved by checking for leaks and adjusting the carburetor.

If the chainsaw does not pick up speed and stalls after it has been running normally for about 5 minutes, the reason may be a defective fuel tank breather. The vacuum created in the fuel tank during tool operation prevents the engine from receiving the necessary amount of fuel for its normal operation, and for this reason it will be unable to gain speed or stall. At the same time, if you stop the tool, open and close the fuel tank cap and start the chainsaw again, the tool will work normally again for about five minutes, after which it will stop gaining speed or stall.

The reason that the chainsaw does not pick up speed can also be excessive carbon deposits in the muffler, which makes it difficult to exhaust exhaust gases, thereby reducing the power and engine speed.

If you want to check the tightness of the crankcase, but there is no special tool, you can use the following test procedure.

Why does a chainsaw stall under load

In some cases, the chainsaw under load is unable to work normally and simply stalls. A common reason for this behavior is improper carburetor adjustment, or air leaks through the crankshaft oil seals or carburetor gasket. And also this behavior can occur due to leaks in the carburetor.

It is best to diagnose the cause and eliminate the fact that the chainsaw starts and stalls under load, best of all in a service center, since a special tool is needed to check the tightness of the carburetor and crankcase.

A saw that is unable to operate under load will also be unsteady at idle speed. They will “float”. Diagnostics begin with a check for leaks in the crankcase and carburetor. If air leaks through the crankshaft oil seals, they must be replaced. If air leakage is detected in the carburetor, the cause can be eliminated by installing a repair kit of gaskets.

Only after the above actions have not yielded results and the crankcase with the carburetor is sealed, you can start adjusting the carburetor.

The reason for this algorithm is as follows, if the air leak from the crankcase is not eliminated, but the carburetor was simply adjusted to normal engine operation, then the fuel mixture will contain more fuel than is required with a sealed crankcase, which in turn will significantly increase its consumption. Also, most likely, carbon deposits will appear in the engine, which will also negatively affect the further operation of the chainsaw.

In some models of chainsaws, to ensure the operation of the fuel pump, special hoses are installed that transmit an air impulse from the engine crankcase to the carburetor fuel pump. If this hose is frayed, the saw will idle unevenly and will not work at all under load.

Owners of HUSQVARNA 137 and HUSQVARNA 142 household chainsaws should first of all check the impulse hose for any deviations in engine operation from the norm, since this is considered the most common reason for the breakdown of these chainsaws.

READ  DIY Chainsaw Carb Adjustment

Your Chainsaw Stalls? You Can Fix It, Here’s How

A video showing how to replace a defective impulse hose with your own hands on a HUSQVARNA 142 chainsaw can be viewed below. It shows step by step the process of disassembling the saw, shows the impulse hose and stipulates the consequences of its malfunction HUSQVARNA 142.

Malfunctions leading to improper operation of the chainsaw

There are a number of faults that must be taken into account when diagnosing, since they can lead to interruptions in the operation of the saw.

  • Worn crankshaft bearings. With worn out crankshaft bearings, runout is inevitable on the main shaft, where the flywheel is attached. In such a situation, it is impossible to adjust the gap between the flywheel and the ignition coil, which entails interruptions in sparking, and the unstable operation of the chainsaw.
  • Impulse channel contamination. The impulse channel serves to ensure the operation of the fuel pump, respectively, its contamination leads to improper operation of the pump, which will make it impossible for the saw to work (it will start and immediately stall).
  • CPG wear. As a rule, with increased wear of the CPG, there is a decrease in compression in the engine of the chainsaw, which will necessarily affect its ability to develop speed.
  • Dirty fuel and air filters.

Algorithm for checking the crankcase for leaks

  • Remove the side cover and tire from the chainsaw.
  • Unscrew the spark plug and put a lace with knots into the cylinder through the spark plug hole, thereby stopping the movement of the piston and crankshaft.
  • As a lace with knots, you can use the old cord from the starter, tying knots on it every 3-5 cm.
  • Spin the chain saw drive sprocket.
  • Remove the oil pump cover and the pump itself.
  • Remove the starter from the chainsaw.
  • Unscrew and remove the flywheel.
  • Remove carburetor.
  • Using a syringe, through the carburetor hole in the cylinder, pour gasoline into the crankcase, while observing the crankshaft oil seals. If gasoline flows through them, then the oil seals have become unusable and must be replaced with new ones.
  • It is better to entrust the installation of oil seals to professionals.

An indirect sign of crankcase leaks are oil leaks in the area of ​​the oil seals.

Summing up

When the first signs of improper operation of the chainsaw appear, it is worthwhile to carry out a complete diagnosis. In order to avoid damage to the saw as a result of improper maintenance, it is better to entrust the work of identifying and eliminating engine malfunctions to professionals. And most importantly, you do not need to use a chainsaw with minor defects, since this will lead to even greater problems.

The chainsaw starts and stalls. Why?

There are several simple rules for the operation and maintenance of a chainsaw, the observance of which will maximize its service life. Preparing the correct fuel mixture, regularly cleaning filters and periodically replacing parts will save you from having to repair your tool for a long time. If it was not possible to avoid the breakdown, then you can figure out its cause completely independently. This applies to any brands of chainsaws, from the more complex Husqvarna and Stihl models to the simplest Makita and Patriot models.

chainsaw, starts, stalls

Chainsaw stalls when tilted

With the horizontal position of the chainsaw, the fuel pipe lies at the bottom of the gas tank, but when the tool is tilted, the pipe is above the fuel mixture, i.e. in the air. This is precisely the reason that the chainsaw stalls on its side.

The chainsaw stalls immediately

What to do if the chainsaw stalls immediately after starting? First you need to check the presence of fuel in the gas tank. If its level is not enough, then you need to prepare the fuel mixture in strict accordance with the ratio of gasoline and oil prescribed in the operating instructions. Gasoline must have the highest possible octane number, and the required brand of oil, as a rule, is indicated in the data sheet of the chainsaw.

Next, we check the spark plug, as well as the contact of its tip with the high-voltage wire. The gap between them should be no more than 0.5 mm. If necessary, the candle is cleaned of carbon deposits and dried. It is recommended to occasionally change the candle to a completely new one. The reasons for the tool stalling when you press the gas lie in the fuel filter or carburetor jet. Cleaning the gas filter will not take much time and effort, but it is better to entrust the disassembly and cleaning of the carburetor to the specialists of the service center.

Chainsaw stalls under load

If the chainsaw stalls under load, this may be due to the fuel system or a dirty air filter. Changing the fuel with the correct gasoline / oil ratio or cleaning the air filter are universal solutions to this problem. An improperly prepared mixture of low-quality gasoline and, for example, engine oil is the main reason for the malfunctioning of a chainsaw, including in the case when it heats up and stalls.

Chainsaw stalls at idle speed

Cases are common when the chainsaw stalls at idle. First of all, you need to check the muffler, and, if it is dirty, clean it from exhaust tar deposits. Also on the carburetors of some models, etc., there are bolts with the inscriptions H and L. respectively, rough and fine tuning. By adjusting the bolt L during the operation of the chainsaw in such a way that its speed increases (turn the bolt just half a turn), it is possible to eliminate this problem. Adjusting the carburetor requires the mandatory presence of an electronic tachometer and is a rather time-consuming process. That is why in such cases it is better to turn to professionals.

Chainsaw stalls at high revs

In the event that the tool stalls at high rpm, there are three parts to check: the air filter, the fuel pump, and the gasoline filter. The air filter must be cleaned, you can even wash it under water and dry it thoroughly. Then it is enough to disconnect the fuel hose from the carburetor and see if fuel flows out of it or not. If it flows with a full stream, the petrol filter need not be checked. If, on the contrary, the fault has been found. The breather can be cleaned with a regular needle, and the filter can be carefully disconnected from the suction hose, cleaned or replaced with a new one. The gasoline pump is checked for wear: if fuel does not seep through it, then everything is fine with it. If the problem that your tool stalls at full speed is due to some damage to the pump, then this part just needs to be replaced with a new one.

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Additional Tips

First of all, what you should remember when purchasing this kind of tool is that certain parts of the saw must be replaced with new ones after their service life (passport) has expired. It is for this reason that the instructions should always be at your fingertips, since everything is described in a detailed way there.

Parts of this kind include: an asterisk (leading), a bus, a part of a system (anti-vibration), and a chain. Since you should not forget that if this “filling” is not changed to a new one at the necessary time, then these worn-out parts will negatively affect the rest of the chainsaw. It is for this reason that you frequently check the depth of the direct toothing. Remember that it should not be higher than a week 0.5 mm.

Why does the chainsaw immediately stall and thrash when the gas is pressed

Chainsaws are fairly reliable and uncomplicated designs. Therefore, if you properly care for them and handle them based on the manufacturer’s recommendations, then they fail well, very rarely and various kinds of breakdowns are quickly eliminated. But if you are faced with this situation and want to personally repair your tool without resorting to the help of professionals, then delve into the information provided below.

READ  Proper Chain Installation On A Chainsaw

In fact, it is unambiguously and precisely impossible to determine the reason why the tool does not start or stalls when you press the gas, since there are a lot of factors affecting this. But do not forget that, starting from the fact that the chainsaw is equipped with a simple two-stroke engine, conditions such as lubrication, fuel, spark and air are important for its effective performance.

Consequently, the carburetor is directly involved in the preparation of the fuel-air mixture, the filter cleans the air from dust, the ignition unit and the spark plug create a spark, and there is lubricant in the gasoline.

That is why it is necessary to search for the causes of this kind of breakdown in a sequential order, starting directly from the simple ones and gradually moving on to the complex ones. And this is an important factor in the correct repair, since the person who, without thinking, begins to deal with the analysis of the carburetor, brings it to risk. Since this kind of unit must be repaired or adjusted directly in special workshops (read about adjusting the carburetor).

Filter dirty

Since, for example, a Stihl chainsaw stalls when you press the gas for a simple reason, namely, a simple clogging of the direct breather.

In order to solve this kind of problem, all you have to do is disconnect the (fuel) hose from the carburetor and pay attention to whether the fuel is leaking from it. Since if the mixture flows in a full stream, this means that the breather is not contaminated, but if on the contrary, then the cause of the breakdown has been found.

Insufficient chain lubrication prevents starting and the saw does not develop speed

Many people ask the question: why does the chainsaw stall when I press the gas? The answer may also lie in insufficient chain lubrication (see oil for the chainsaw chain), since the oil line may leak, or the direct channels may simply be clogged. That is why pay attention to the chain, because if it is dry, then, without delay, start cleaning the channels that supply oil directly to the tool tire. After that, inspect in detail the parts where the oil pump fittings are connected to the pipes. But if you notice that the oil leaks at the joints, or found cracks on the pipes themselves, then in the first case, seal the leaks with a sealant, and the pipes will have to be replaced.

The main elements of chainsaws

Before starting to delve into the issues of breakdowns and tool repairs, let’s first figure out what the chainsaw itself consists of. First of all, I would like to note that this tool belongs to the category of technology, the operation of which directly depends directly on the internal combustion engine.

It is also important that chainsaws are equipped with an engine with one cylinder, and the work of which is carried out on such kind of fuel as gasoline. It is worth noting that, despite the similarity with other tools, it does not have a gearbox. And it is replaced by a kind of single-stage chain transmission, through which the movement of the chain itself (saw) is made.

In fact, a chainsaw is a fairly simple design, but this does not prevent it from being reliable, practical and capable of completely providing direct uninterrupted and cyclical operation even in rather difficult conditions. This tool consists of a huge range of certain elements “vital” for its correct and productive work. This is a carburetor, a direct chain tensioner, a tire complete with a chain and other elements.

Before buying a chainsaw, be sure to study all the options and choose the brand of chainsaw that suits you.

To simplify your choice, we have compiled for you a rating of chainsaws in terms of reliability.

If you have a limited budget, then read the article about Russian chainsaw manufacturers.

Not enough fuel to feed and run the chainsaw at full power

If the chainsaw stalls when gas is added, it means that the fuel is not supplied in sufficient quantities for the full operation of the chainsaw. This may be due to both clogging of the carburetor (its jet) and contamination of the filter itself (fuel). Remember that only professionals should check the first node, but you can clean the second one yourself.

There is no spark and the chainsaw does not pick up speed

The chainsaw stalls when you press the gas due to the fact that there is no spark. This can happen when there is no good contact between the tip of the candle and the wire (high voltage). However, if this kind of connection works correctly, but there is still no spark, then the whole reason is the ignition unit (electronic). It is important to note that these types of parts cannot be repaired, so they can only be replaced.

Do not forget that by examining the spark plug, you can get significant information regarding the breakdown of the chainsaw. Since if its surface is dry, then the reason for this is the cylinder, which is not directly supplied with fuel. That is why you will have to check the entire range of its presentation step by step. If the candle is covered with black soot, then this means that the carburetor is not working correctly, that is, it either supplies a lot of fuel or pours oil directly into gasoline.

Filling the mixture when the mechanism is running

Also, the cause of a breakdown can be the direct filling of the mixture with a candle at the moment when the mechanism is started. In order to solve this problem, it is necessary to unscrew and dry the candle, but remember that it should never be ignited. Excess fuel must be drained through the hole (plug), wait 20-30 minutes, then put it back in place and try to start the tool again.

Why does a chainsaw stall under load

Sometimes the saw will not function properly under load. This is most often caused by improper adjustment or leaks in the carburetor. In addition, air leaks through the carburetor gasket or crankshaft oil seals may be the cause of this problem. A tool that is unable to function under load also cannot maintain idle speed reliably.

Diagnostics begins with checking the carburetor and crankcase for leaks. If air leaks through the crankshaft oil seals, they need to be replaced. If air leakage in the carburetor is detected, the installation of a repair kit of gaskets is required to solve the problem.

If these actions did not lead to the desired result and the crankcase with the carburetor is tight, then the carburetor needs to be adjusted.

If a Husqvarna chainsaw stalls under load, then for any deviations in the functioning of the engine, you should first of all check the impulse hose, since this is the most common cause of breakage of this brand of chainsaws.

Why does a chainsaw stall when heated

It often happens that the chainsaw starts up on a cold one, but stalls during the heating process. This behavior of the tool can be caused by the following reasons:

  • The carburetor is incorrectly set. You can identify this problem by how the device is started up on a cold one. If it is performed without closing the air damper, and the engine starts without a preliminary flash, this means that after heating the engine, the fuel fills the candle. The solution to this problem is to adjust the carburetor. Details on carburetor adjustment
  • Coil (ignition module) malfunction. This problem can be identified by sequentially checking the spark, first on a cold, and then on a hot motor. If there is no spark on a hot engine, then you need to replace the ignition coil.
  • Defective spark plug. In this situation, as in the case of a malfunction of the ignition module, the spark disappears when the engine heats up. It is necessary to replace the spark plug with a new one, and if this does not lead to a solution to the problem, then the ignition module and the distance between it and the flywheel should be checked.
READ  Fills a candle on a Husqvarna chainsaw

Why the chainsaw stalls, the main reasons.

What to do if the chainsaw stalls when you press the gas

One of the most common questions regarding the operation of this device: why does the chainsaw stall when you press the gas and what should be done to solve this problem? In such a situation, you need to do the following:

  • check the fuel filter;
  • inspect the fuel hoses for leaks;
  • check the muffler;
  • try to increase the speed a little;
  • check the condition of the rubber seals on the crankshaft.

The chainsaw starts and stalls. the reason

If the chainsaw starts and stalls at the first attempts to do the job, then the reason may be problems with the chain brake or its jamming due to lack of lubrication. In this case, the oil level is measured. If the amount of lubricant is sufficient, then the cause may be in the tube that leads it to the lubricating mechanism.

Another reason may be a broken carburetor. If he only needs adjustment, it can be done independently in accordance with the instructions. If the carburetor needs cleaning or repair, then you cannot do without the help of professionals.

Another possible cause of this malfunction is a low fuel level in the tank. In this case, the saw stalls when tilted, since the remaining fuel mixture ends up in the part of the tank opposite to the place where the suction tube is located.

Checking the main systems of the chainsaw

If the chainsaw refuses to work properly, you must make sure that all the conditions required for its normal operation are provided:

  • fuel;
  • spark;
  • grease;
  • air.
chainsaw, starts, stalls

Then it is necessary to sequentially check the functioning of all its elements. First you need to check the fuel tank. If the cause is not volume and quality of fuel, then spark plugs may be the likely cause of the problem. The gap at the candle should not exceed 0.5 millimeters. If it is too small, it means that carbon deposits have been deposited on the candles. In this case, remove the candles, clean them, then reinstall and try to start the chainsaw. In addition, it is advisable from time to time to completely replace the candles with new ones, even if they are in good condition.

Then you need to check the condition of the fuel filter and carburetor. Self-cleaning of the fuel filter is a simple task, but it is best to entrust the repair of the carburetor to specialists.

Why the chainsaw doesn’t pick up speed and stalls

If the saw cannot gain speed or stalls when you press the gas, then most likely this is caused not by the tightness of the carburetor or engine crankcase. This problem is eliminated by checking for leaks and adjusting the carburetor.

In addition, this malfunction may be associated with a defect in the fuel tank breather. Due to the formation of a vacuum in the fuel tank during the operation of the chain saw, the required volume of the fuel mixture does not enter the engine, as a result of which it cannot gain speed or stalls. If you stop the chain saw, open and close the fuel tank and turn it on again, it will work normally for about five minutes, and then it will stop picking up speed again or stall.

Another possible reason that the saw is not able to pick up speed may be excess carbon deposits in the muffler, which makes it difficult for exhaust gases to escape, which reduces the power and engine speed.

The main causes of chainsaw breakdown

Although the chain saw is a simple device, from time to time, problems arise in its operation, which can only be fixed by disassembly. The following malfunctions can be cited as examples:

  • the chainsaw is not picking up speed;
  • the chainsaw stops functioning in the cut;
  • the chainsaw starts and stalls;
  • the chainsaw loses its power;
  • the chainsaw stalls when pressed.

Most often, malfunctions are associated with interruptions in the functioning of the motor, as well as malfunctions of other systems and components. Proper handling of this technique is essential. When all the rules of use are followed, problems with a high probability lie in the most obvious. When looking for the causes of problems, it is advisable to start by checking the simplest part of the chain saw and finish the most difficult.

Why does a chainsaw stall under load

Sometimes the saw will not function properly under load. This is most often caused by improper adjustment or leaks in the carburetor. In addition, air leaks through the carburetor gasket or crankshaft oil seals may be the cause of this problem. A tool that is unable to function under load also cannot maintain idle speed reliably.

Diagnostics begins with checking the carburetor and crankcase for leaks. If air leaks through the crankshaft oil seals, they need to be replaced. If air leakage in the carburetor is detected, the installation of a repair kit of gaskets is required to solve the problem.

If these actions did not lead to the desired result and the crankcase with the carburetor is tight, then the carburetor needs to be adjusted.

If a Husqvarna chainsaw stalls under load, then for any deviations in the functioning of the engine, you should first of all check the impulse hose, since this is the most common cause of breakage of this brand of chainsaws.

The chainsaw starts and stalls cause

Owners of chainsaws sometimes have to deal with the fact that the saw, for no apparent reason, stops working normally. To understand why the chainsaw stalls under various operating modes, and also to describe how you can diagnose a malfunction, we will try in our article.

chainsaw, starts, stalls

Turning off the engine in operating mode

Alternatively, if the chainsaw heats up and stalls, troubleshooting should be sought in the carburetor settings or in the high-voltage circuit of the ignition system unit.

When it overheats, the spark disappears or becomes so weak that its power is not enough to fully ignite the fuel-air mixture.

The engine also stalls on hot in the event of a malfunction of the interference suppression resistance, which is located in the tip of the spark plug.

Self-repair benefits

Experts offer several search options. the reasons for a poor engine start or if the power unit stalls during operation. Recommendations are equally valid for household and professional chainsaws.

Owners with experience in operating chainsaw equipment use simple, time-tested intuitive algorithms for troubleshooting, which allows them to quickly eliminate many failures and breakdowns directly in the process.

The success of the work is facilitated by knowledge of the design of the tool and the interaction of all its components, the availability of plumbing and repair skills and operational experience. These same abilities allow owners to use their chainsaw technology with high efficiency.

Self-repair provides an opportunity for significant savings in material resources and reduction of forced downtime.

Electrical equipment

Malfunctions of the ignition system are determined quite simply by checking the spark plug and adjusting the gap in the contacts. After checking the integrity of the wiring, the reasons for the failure should be looked for in the operation of the electronic unit.

The absence of a spark on the contacts may be the result of a breakdown of the noise suppression resistor located in the candlestick housing. To check its integrity, it is enough to connect the high-voltage wire to the candle directly.

Chainsaw starts and stalls

The chainsaw does not work stalls. Doesn’t cut a boredom. The chainsaw starts and stalls. Why? The chainsaw stalls immediately. What to do. How much can you tell about the secret here it is.

Engine stalls when going to idle

chainsaw, starts, stalls