Husqvarna Saw 137 Starts And Stalls Reason

Chainsaw owners 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 describe how to diagnose a malfunction, we will try in our article.

Why chainsaw stalls when heated

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

  • Faulty ignition module (coil). You can 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 you should try to fix the problem by replacing the ignition coil.
    Husqvarna Saw 137 Starts And Stalls Reason
  • The chainsaw carburetor has the wrong setting (pours a candle on a hot one). You can identify the problem by the way the saw starts up in the cold. If it is not necessary to close the air damper for a cold start, and the engine starts without a preliminary flash, then the fuel mixture is not formed correctly and after heating the engine, the fuel fills the candle and makes starting impossible. The problem is fixed by adjusting the carburetor.
  • Defective spark plug. In such a situation, similarly to a faulty ignition coil, a spark disappears when the engine is heated. 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 with a multimeter or by replacing it with a known working one. The multimeter checks the primary and secondary windings in the resistance measurement mode. The resistance index of the primary winding, the working coil, is 1 kOhm. Secondary 4 kOhm.

Why the chainsaw stalls under load

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

Diagnose the cause and eliminate the fact that the chainsaw starts and stalls under load, it is best in the service center, because a special tool is needed to check the tightness of the carburetor and engine crankcase.

The saw, unable to work under load, will also hesitate to maintain idle speed. They will “swim.” Diagnostics begins with a leak test of the crankcase and carburetor. If air leakage is detected 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 gasket kit.

Only after the above actions have failed and the engine crankcase with the carburetor are tight, you can proceed to adjust the carburetor.

The reason for this algorithm is as follows: if the air intake from the crankcase has not been eliminated, and the carburetor has simply been adjusted before the engine is operating normally, the fuel mixture will contain more fuel than is required for a sealed crankcase, which in turn will significantly increase its consumption. Also, most likely, carbon deposits will appear in the engine, which will also adversely 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 air impulse from the crankcase to the carburetor fuel pump. If this hose is frayed, the saw will idle and will not work under load at all.

Owners of household chainsaws HUSQVARNA 137 and HUSQVARNA 142 for any abnormal engine operation should first check the impulse hose, since this is considered the most common cause of breakdown of these chainsaws.

A showing how to replace a defective impulse hose with your own hands on a HUSQVARNA 142 chainsaw can be seen below. It steps through the process of disassembling the saw, shows the impulse hose and stipulates the consequences of its malfunctioning HUSQVARNA 142.

Why the chainsaw is not gaining momentum and stalls

If the chainsaw, one minute after start-up, is not capable of gaining speed or stalls when the trigger is pulled, the carburetor or engine crankcase is most likely leaky. As in the previous case, the problem can be solved by checking for leaks and adjusting the carburetor.

If the chainsaw does not gain momentum and stalls after it has worked normally for about 5 minutes, the cause may be a defective fuel tank breather. The vacuum created in the fuel tank during the operation of the tool does not allow the engine to receive 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 again work normally for about five minutes, after which it will stop gaining speed or stall.

The reason that the chainsaw is not gaining momentum may be excessive soot in the muffler, which makes it difficult to exhaust the exhaust gas, thereby reducing engine power and speed.

If you wish, you need to check the tightness of the crankcase, but the lack of a special tool, you can use the following test procedure.

Crankcase leak check algorithm

  • Remove the side cover and tire from the chainsaw.
  • Unscrew the spark plug and lay the cord with the knots in the cylinder through the spark plug hole, thereby blocking the movement of the piston and crankshaft.
  • As a lace with knots, you can use the old cord from the starter, having tied knots on it after 3-5 cm.
  • Unscrew the drive sprocket for the chainsaw.
  • Remove the oil pump cover and the pump itself.
  • Remove the starter from the chainsaw.
  • Unscrew and remove the flywheel.
  • Remove the carburetor.
  • Using a syringe, pour gasoline into the crankcase through the hole for the carburetor in the cylinder, 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.
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An indirect sign of crankcase leaks are oil smudges in the oil seal area.

Why the chainsaw starts and immediately stalls

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

All of the above options for improper engine operation have similar causes, which, depending on their neglect, can have different manifestations. For example, with a slight suction of air into the engine crankcase, its operation will not change much, the engine power will drop slightly, its maximum speed will increase, and it will be able to warm up a bit more. In the middle stages of air leakage, the engine will stop idling and will become very hot during operation. A strong suction of air will make the saw impossible 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, inside the engine at the time of its malfunction, there will be processes that irreversibly lead the saw to the most serious consequences, for example, fusion of the piston, jamming of the crankshaft.

Failures leading to malfunction of the chainsaw

There are a number of malfunctions that must be taken into account in the diagnosis, because they can lead to interruptions in the saw.

  1. Worn crankshaft bearings. With worn crankshaft bearings, a beating on the main shaft where the flywheel is mounted is inevitable. In such a situation, it is impossible to adjust the gap between the flywheel and the ignition coil, which entails interruptions in spark formation, and unstable operation of the chainsaw.
  2. Impulse channel pollution. The pulse channel serves to ensure the operation of the fuel pump; accordingly, its pollution leads to improper operation of the pump, which will make the saw impossible to work (it will start and immediately stall).
  3. Cpg wear. As a rule, with increased wear of the CPG, a decrease in compression in the chainsaw engine is observed, which will necessarily affect its ability to develop speed.
  4. Pollution of fuel and air filters.

To summarize

When the first signs of malfunction of the chainsaw appear, it is worthwhile to conduct a complete diagnosis. In order to avoid damage to the saw due to improper maintenance, it is better to entrust the work to identify and troubleshoot engine malfunctions to professionals. And most importantly, you do not need to use a chainsaw with minor defects, because this will lead to even greater problems.

Chainsaw Starts Not Stalling Cause

When chainsaw owners have to face the goal that the saw, for no apparent reason, ceases to work normally. We will try in our article to understand why the chainsaw stalls under different operating modes, and now outline, diagnose the malfunction the most.

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Why chainsaw stalls when heated

The situation when a chainsaw starts up on a cool one can stall during heating, it is familiar to many who own it. The main prerequisites for such saw behavior are subsequent.

    Faulty ignition module (coil). Finding a malfunction is a natural option by checking the spark first on a cool engine, and then on a hot one. If there is no spark on a hot engine, it means you should try to remove the fault by replacing the ignition coil.

Check the ignition coil naturally with a multimeter or by replacing it with a pre-functional one. A multimeter test of the primary non-secondary winding is carried out while working in the resistance measurement mode. The resistance index of the primary winding, the working coil, is one kOhm. Secondary four kOhm.

Husqvarna Saw 137 Starts And Stalls Reason

Why the chainsaw stalls under load

From time to time, a chainsaw under load is unable to work normally, not only stalls. A common reason for this behavior is incorrect carburetor adjustment, or air intake through the crankshaft oil seals on another carburetor gasket. Already, this behavior is being done on the basis of a carburetor leak.

To diagnose the reason, do not remove the fact that the chainsaw starts up and does not stall under load, it is more reliable in service, because a special tool is needed to check the density of the carburetor not the crankcase of the motor.

The saw, unable to work under load, will also hesitate to delay idle speed. They will “swim.” Diagnostics begins with a check for the density of the crankcase not the carburetor. If detected air leaks through oil seals crankshaft, they need to be changed. If air leakage is detected in the carburetor, there is an option to remove the cause by installing a repair set of gaskets.

Only when the above actions did not give a result, the crankcase of the motor with the carburetor is tight, we begin to adjust the carburetor.

The reason for this method in the following, if air leaks If the carburetor was simply adjusted to normal engine operation, the fuel mixture will contain a lot of fuel than it is required for an airtight crankcase, which will significantly increase its consumption. Also, it is more likely that only deposits will appear in the engine soot, which will also adversely affect the upcoming work of the chainsaw.

In some models of chainsaws, to ensure the operation of the fuel pump, special hoses are installed that transmit air impulse from the crankcase to the carburetor fuel pump. If this hose is frayed, the saw will idle irregularly; it does not work under load.

Husqvarna. It works badly, it stalls. An interesting case

Chainsaw Repair Husqvarna.It works badlystalls.Interesting case.

Owners of HUSQVARNA household chainsaws one hundred thirty-seven and HUSQVARNA one hundred forty-two for any deviations in engine operation from the norm, you must first check the impulse hose, because this is considered the most common cause of breakdown of these chainsaws.

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A showing how to replace a defective impulse hose with your own hands on a HUSQVARNA 142 chainsaw can be seen below. It steps through the process of disassembling the saw, shows the impulse hose and stipulates the consequences of its malfunctioning HUSQVARNA 142.

Why the chainsaw is not gaining momentum and stalls

If the chainsaw, one minute after start-up, is not capable of gaining speed or stalls when the trigger is pulled, the carburetor or engine crankcase is most likely leaky. As in the previous case, the problem can be solved by checking for leaks and adjusting the carburetor.

If the chainsaw does not gain momentum and stalls after it has worked normally for about five minutes, the cause may be a defective fuel tank breather. The vacuum created in the fuel tank during the operation of the tool does not allow the engine to receive 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 again work normally for about five minutes, after which it will stop gaining speed or stall.

The reason that the chainsaw is not gaining momentum may be excessive soot in the muffler, which makes it difficult to exhaust the exhaust gas, thereby reducing engine power and speed.

If you wish, you need to check the tightness of the crankcase, but the lack of a special tool, you can use the following test procedure.

Crankcase leak check algorithm

  • Remove the side cover and tire from the chainsaw.
  • Unscrew the spark plug and lay the cord with the knots in the cylinder through the spark plug hole, thereby blocking the movement of the piston and crankshaft.
  • As a lace with knots, you can use the old cord from the starter, having tied knots on it after 3-5 cm.
  • Unscrew the drive sprocket for the chainsaw.
  • Remove the oil pump cover and the pump itself.
  • Remove the starter from the chainsaw.
  • Unscrew and remove the flywheel.
  • Remove the carburetor.
  • Using a syringe, pour gasoline into the crankcase through the hole for the carburetor in the cylinder, 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 smudges in the oil seal area.

Why chainsaw starts and immediately stalls

The chainsaw starts and stalls immediately, the reason for this behavior may be hidden in the carburetor. Why does the Husqvarna 240 chainsaw stall when it warms up, and then it won’t start? A malfunction of the fuel pump or a malfunction of the main fuel jet can cause this behavior of the saw. The inability to operate the chainsaw after startup requires a complete diagnosis at the service center.

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

In parallel with the visible manifestations of malfunctions, for example, the inoperability of the chainsaw after starting, inside the engine at the time of its malfunction, there will be processes that irreversibly lead the saw to the most serious consequences, for example, fusion of the piston, jamming of the crankshaft.

Failures leading to malfunction of the chainsaw

There are a number of malfunctions that must be taken into account in the diagnosis, because they can lead to interruptions in the saw.

  1. Bearing wear crankshaft. With worn crankshaft bearings, a beating on the main shaft where the flywheel is mounted is inevitable. In such a situation, it is impossible to adjust the gap between the flywheel and the ignition coil, which entails interruptions in spark formation, and unstable operation of the chainsaw.
  2. Impulse channel pollution. The pulse channel serves to ensure the operation of the fuel pump; accordingly, its contamination leads to improper operation of the pump, which will make the saw impossible to work (it will start immediately stall)
  3. Cpg wear. As a rule, with increased wear of the CPG, a decrease in compression in the chainsaw engine is observed, which will necessarily affect its ability to develop speed.
  4. Pollution of fuel and air filters.

To summarize

When the first signs of malfunction of the chainsaw appear, it is worthwhile to conduct a complete diagnosis. In order to avoid damage to the saw due to improper maintenance, it is better to entrust the work to identify and troubleshoot engine malfunctions to professionals. And most importantly, you do not need to use a chainsaw with minor defects, because this will lead to even greater problems.

There are several different reasons why a chainsaw does not start: the device may be malfunctioning, there may be a lack of sufficient fuel, and violations in its supply. Often a malfunction can be repaired by one’s own hands. In some cases, specialist assistance may be required.

Why the chainsaw doesn’t start

In the event of defects, it is necessary to check the serviceability of the components.

If a new chainsaw does not start, check the presence and supply of fuel, the occurrence of a spark on the spark plug, the functioning of the exhaust valve, and the condition of the filters. The operation of the stalling device built into the fuel cap may also be disrupted.

To cold

The reason why the device does not start up to cold is often a violation of the sequence of starting the engine.

You should read the instructions: manufacturers indicate how to properly launch a chainsaw.

To enrich the fuel, first close the choke. After this, fuel is sucked. For this, a special primer is used. Then turn on the ignition. Before the first flash of the engine, you need to make several movements of the starter. The damper opens, the device starts up. If the sequence is broken, any step is skipped, improper operation is possible.

If the chainsaw stops turning on, the likely cause is a problem with the fuel system. Start-up problems can occur due to improperly adjusted carburetor, clogged line and fuel filter. The quality of the fuel also matters. If the fuel is diluted with water, the device does not start up well or does not work at all. The mixture should be fresh.

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A possible cause of a problem start is engine failure. Wear or breakage of a part leads to undesirable consequences: a decrease in compression in the cylinders and other troubles. It is recommended to contact specialists with such problems, since it is difficult to diagnose and fix the breakdown on their own.

Hot

If the chainsaw does not start up hot, you should start inspecting the tool with a spark plug. A spark test on a candle will also be required.

For the appliance to work properly, there must be a dry candle. When it is wet, sparks do not appear on the contacts. You can try replacing the part with a new one.

If there is a spark and the spark plug is working, try looking for a problem in the fuel system. If, during a visual inspection, it was not possible to find the cause of the breakdown, the carburetor should be removed. If the amount of fuel exceeds the permissible, the device will not work. The candle should be wet. Turn the candle hole down. If the fuel mixture is poured, the reason why the chainsaw does not start up hot will be an excess of fuel.

Why does the chainsaw stall

If the chainsaw starts and dies, the reasons may be different. An external inspection should be performed before attempting to repair the tool.

If the saw stalls during operation, check for a mixture of oil and gasoline in the tank. If the fuel mixture runs out, the device will not work. In situations where gas is still left, you should evaluate the quality of the tool until it is turned off. The occurrence of extraneous sounds and the subsequent abrupt stop should alert.

The formation of carbon deposits on the electrodes can also cause difficulties in the operation of the tool. You should carefully inspect the device, if necessary, clean.

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 revs helps.

Sometimes checking all the details does not give a result, the tool suffocates, chokes when gas is added. If the device stalls when a person presses the gas, it is possible to supply fuel in an amount insufficient for normal operation. This phenomenon occurs due to clogging of the carburetor or filter.

Damage can also occur due to dust clogging the air filter. When you give gas, the device stops working. Do not fix the problem yourself, since each model has individual characteristics.

Lack of lubrication on the chainsaw chain may cause a problem. If the circuit is dry, clean the channels through which oil is supplied to the instrument bus. If the oil leaks, there are cracks, defects on the pipes, you need to treat them with sealant.

Under load

In situations where the device stalls under load, the problem may be with the gas tank or filters. Check fuel quality and change filter.

Often the saw does not gain momentum due to the fact that the mixture poured into the gas tank has a low octane rating. There is not enough power, sufficient heating does not work, the chainsaw stalls under load.

Often malfunctions of components lead to the fact that the device stalls under load. Hoses, gaskets, gaskets should be checked for leakage. If the parts are defective, you can try to repair them or replace them.

Idling

In those situations when the chainsaw stalls at idle, it is necessary to inspect the condition of the muffler. If the part is dirty, the exhaust gases are poorly removed, the engine cannot continue to work, it stops.

The saw stalls at idle and in those cases when the carburetor is incorrectly configured. For newcomers, it is better to entrust the repair to specialists, since there is a possibility of incorrect settings, because of which the tool will not be able to work. To adjust the carburetor, a tachometer is required.

At high speeds

If the device stalls at high speeds, pay attention to the condition of the gasoline and air filters, and the serviceability of the fuel hoses.

A dirty air filter can be rinsed under warm running water. It is important to carefully dry the part before installing it so that water does not interfere with the health of the instrument.

If fluid stops flowing through the fuel hose, it is clogged. You can clean the part or replace with a new one.

In those cases when the saw stalls at high speeds, but the fluid fully flows through the hose, and the air filter is clean and serviceable, look for the cause of the breakdown in the fuel filter. Install a new one in its place or clean it.

In some cases, the problem lurks in the gas pump. When the component deteriorates, fuel begins to leak through the walls. If this phenomenon is noted, a new pump should be installed.

When tilted

If the saw does not develop revolutions when tilting, it turns off, 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 enough fuel, since the fuel pipe is above the level of the mixture.

What to do

If a malfunction is detected, you can try to fix it yourself. If you can’t repair the device yourself, contact a specialist. The master will inspect the device, make a professional repair. This will avoid the risks of harming the tool during attempts to repair it with your own hands. Ways to eliminate dysfunctions depend on which part turned out to be defective, which is why the saw’s work was disturbed.

If the chainsaw starts and immediately dies, often the reason is a lack of fuel. It is necessary to control the amount of fuel fluid in the gas tank, fill the device in a timely manner.

It is important to operate the tool correctly following the instructions. Improper use of the chainsaw can degrade the quality of the cut, lead to damage, damage to the device.

New technology can start up tight even with an easy-start system. After some time, this problem is resolved by itself. If a person has doubts about the health of the device, it is recommended to consult a master.