The Chainsaw Starts And Stalls Reasons How To Eliminate

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 hole for the carburetor 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.

The Chainsaw Starts And Stalls Reasons How To Eliminate

Why the chainsaw starts up and immediately stalls

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. 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 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 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 leakage will make it impossible for the saw to work, it will start and immediately stall.

In parallel to 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, the piston melting, the crankshaft jamming.

The chainsaw starts and stalls cause

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 to describe how you can diagnose a malfunction, we will try in our article.

Why the chainsaw doesn’t pick up speed and stalls

If the chainsaw is unable 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 accelerate or stall. In this case, 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 is not picking 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.

Malfunctions leading to improper operation of the chainsaw

There are a number of malfunctions that must be taken into account when diagnosing, because 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 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 incorrect 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.

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.

A saw that is unable to operate under load will also be unsteady at idling. They will "float". Diagnostics begins 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 in the carburetor is detected, 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, can you 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.

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, which shows how to replace a defective impulse hose with your own hands on a HUSQVARNA 142 chainsaw, can be seen 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.

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.

Every owner of a chainsaw throughout the entire life of the tool regularly encounters problems. As a result of various malfunctions, the chainsaw refuses to start, or works with noticeable failures. Experts will help to fix any of the faults. However, to save your time and money, you can try to repair the instrument yourself. You don’t need to have expensive equipment to do this. It is enough to have the tools that can be found in any garage.

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.

A saw that is unable to operate under load will also be unsteady at idling. They will "float". Diagnostics begins 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 in the carburetor is detected, 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, can you 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.

, which shows how to replace a defective impulse hose with your own hands on a HUSQVARNA 142 chainsaw, can be seen 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.

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.

  • 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.

Troubleshooting

The operation of the equipment must be correct, with periodic inspection of the constituent elements to prevent damage. To troubleshoot, it is necessary to check all components of the equipment for their functioning.

If the chainsaw starts and stalls, the cause can be eliminated on your own. If it is a shortage or improperly prepared fuel mixture, it must be corrected. For prophylaxis during the idle time of the chainsaw, you should always drain the remaining fuel.

Spark plugs should be checked periodically. In this case, remove carbon deposits that clog the joint gap, and also check the tips for the presence of fuel. Another cause of spark plug problems can be gasoline getting wet. To do this, they need to be removed, wiped off with a rag and left to dry. Defective spark plugs are replaced.

If there is no spark between the spark plug and the high-voltage wire, but if there is a good connection, the ignition unit must be replaced.

A clogged muffler is a common cause of breakdown, in which the chainsaw starts up and immediately stalls. To eliminate the malfunction, you need to dismantle the muffler, clean it from carbon deposits using sandpaper or a special chemical solution. If the model of the chainsaw is non-separable, chemicals are poured into the system and are there for several hours, then it is blown.

The carburetor must be adjusted if the chainsaw stalls at idle speed. Fine tuning is a rather laborious process, so it is usually done in service centers. But, on some models there are elements for adjusting it, it is enough to turn the bolt half a turn to increase the speed of the chainsaw, the problems will be eliminated. If the jets, nozzles, channels and filters are clogged, the entire carburetor must be disassembled and cleaned. When oil seals, gaskets, cuffs are worn out, it is necessary to replace them, preventing air leakage.

If there is a problem with the fuel or air filter, replace the fuel pump or clean the air filter.

If the breather is clogged, it must be cleaned with a regular needle.

When the chainsaw starts up and immediately stalls, the reason may lie in the malfunctioning of the chain. To troubleshoot problems, check the presence of oil in the chain lubrication container, as well as the oil return pipe for breaks or blockages.

When inspecting the piston group, pay attention to the cylinder; if necessary, replace it or the piston. The cylinder can be bored to fit the new piston. If the piston with the cylinder is normal, you should pay attention to the defects of the piston rings and the need to replace them.

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Among other things, you should monitor the service life of the parts specified in the product passport, which include the drive sprocket, tire, chain, part of the anti-vibration system, and replace them in time.

If the tool is idle for a long time, it is worth checking the condition of the fuel line. If the tube is cracked, you will have to replace it with a new one.

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 to describe how you can diagnose a malfunction, we will try in our article.

The chainsaw starts normally, but stalls when gas is added

One of the common breakdowns of a household chainsaw is to work only at idle speed, and instant failure when you press the standard gas trigger.

There can always be several reasons for this malfunction:

  • Clogging or initially incorrect adjustment of the standard carburetor. in this case, you will need to clean the unit and adjust it according to the instructions in the operating instructions;
  • Clogged basic air filter of the tool being used. due to this, air does not enter the saw carburetor, which leads to a gradual loss of power;
  • Clogged or worn fuel filter. as a result, the part is not able to pass the amount of fuel that is necessary for the engine to speed up.

If the chainsaw works fine at idle, but stalls under load, then the first thing the owner should do is check the condition of the filters. Only then can you start setting up the carburetor.

Malfunctions leading to improper operation of the chainsaw

There are a number of malfunctions that must be taken into account when diagnosing, because 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 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 incorrect 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.

Why won’t it start and what to do

There may be several reasons why the chainsaw does not start or does not start. To install them, you need to diagnose the device. Possible causes of a problem launch:

  • There is no spark on the spark plug;
  • Poor condition of the air and fuel filter;
  • Poor fuel supply and exhaust port performance;
  • Poorly functioning breather, which is located on top of the tank.

Carbon deposits often appear on the spark plug electrodes and the tool does not start. Therefore, first check the spark plug. If the reason is not hidden in her, then the other elements are examined.

  • To test the spark plug, remove the spark plug. To do this, remove the tip located on the high-voltage wire, take out the candle and put the tip back on. The candle is applied to the cylinder and the starter is started. The engine ignition unit is working properly if the electrodes give off a spark when turned on. When there is no spark, you need to adjust the distance between the electrodes with a feeler gauge or clean the entire part. To start the saw, the distance between the electrodes must be between 0.2 and 0.5 mm.
  • To check the fuel supply, fill the tank with a fuel mixture. The system tube is disconnected from the carburetor and pumped up. Fuel comes in jerks when the system is working properly. With a weak feed, clean the channel through which the fuel or filter is supplied. When gasoline smudges appear under the tank cap, it means that the tank is overfilled and may affect engine performance.
  • Check the fuel filter by disconnecting it from the carburetor. The gasoline supply channel is disconnected and the fuel is pumped. If there is no pressure in the pipe, then the fuel is drained from the tank and the filter cartridge is pulled out. It is cleaned or replaced with a new one.
  • A breather (valve) located on the fuel tank cap is designed to equalize the air pressure, which allows gasoline to flow freely into the carburetor. Sometimes it gets dirty, the air does not flow inside and a vacuum is created, which does not allow the chainsaw to start. The hose through which fuel is supplied is disconnected from the carburetor, then checked. Fuel should flow from the disconnected hose. If this does not happen, then it is cleaned with a simple needle or a jet of air under high pressure.

If it starts and stalls

When the chainsaw starts and stalls, it is due to the carburetor or other parts. Reasons for malfunction:

  • Fuel does not flow well to the engine. This is due to a clogged breather.
  • There is not enough fuel in the tank. By tilting the tool sideways, the remaining fuel flows into one place. This causes the saw to stop working.
  • Poor quality fuel.
  • The plug insulator overheats when poor contact is made between the wire cap and the plugs. Contact between them becomes worse with soot or mechanical shear.
  • Defective spark plugs.
  • Fuel does not flow well to the carburetor through the fuel filter or pump. As soon as the tool starts to increase the speed, it immediately stalls.
  • If the air filter is dirty, the engine cannot withstand high loads and stops.
  • Insufficient or no lubrication in the chain.

Reasons why the Partner (Partner) chainsaw won’t start and how to fix them

If the Partner chainsaw does not start, there is no need to rush to take it for repair. An instruction is attached to each tool, which indicates how to fix the malfunction with your own hands.

Stalls when you press the gas

If the chainsaw stalls when you press the gas, then you need to inspect the gas and air filter, as well as the fuel pump.

  • During operation, a strong clogging of the air filter occurs, and when the gas is pressed, the tool stops working. The filter is dismantled, cleaned or washed with warm water, dried thoroughly and only then installed back. Then disconnect the fuel hose screwed to the carburetor. Gasoline should flow through it. The hose is cleaned or replaced with a new one if no fluid has leaked out. The filter is in good working order and can be left unchecked if the gasoline flows well.
  • The chainsaw stalls. the gas pump may have worn out. If gasoline flows through the walls of the pump, it means that the device has stalled because of it. This part is changed to another.
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In order for the chain saw to start, you need to accurately determine the cause of its malfunction, and then try to fix it yourself. If the problem is not found or it cannot be fixed on your own, then it is better to seek help from specialists.

The chainsaw starts and stalls: the reason,

The reason that the chainsaw can stall right after the factory lies in the malfunction of a certain part of the equipment.

  • The most commonplace reason why the chainsaw started up and stalled could be the low fuel level in the tank. This can be confirmed by stopping the operation of the tool when tilting, when fuel residues accumulate in a certain place in the fuel tank. With low-quality fuel, there may also be a problem with the operation of the chainsaw, in this case, you need to completely replace it.
  • Breather blockage, which significantly reduces fuel consumption to the engine.
  • Insufficient contact of the wire cap with the plug, which leads to strong heating of the plug insulator. Contact deterioration can occur due to mechanical shear or carbon deposits.
  • Broken spark plugs.
  • Clogged muffler, which impairs exhaust gas output, causing the engine to stop running. For this reason, the chainsaw can start and stall at idle speed. Sediment in the muffler can also appear due to poor-quality fuel or improper use of the tool.
  • Poor carburetor adjustment.
  • Breakage of the piston group
  • Fuel filter or pump problems. In this case, gasoline may flow through the pump or poorly flow through the fuel filter to the carburetor. As a result, the chainsaw starts up and stalls when the speed increases.
  • Dirty air filter. Problems with this piece of equipment lead to the fact that, with increased loads on the engine, it simply cannot cope with them due to blockage and stops. A similar result is also obtained with an increase in speed.
  • Short circuit due to lack of or insufficient lubrication, or a problem with the chain brake.

The reasons why the chainsaw starts and stalls

A chainsaw has long been not a luxury, but a necessary tool for those who have a summer cottage or home ownership. But, like any other technique, this tool tends to fail, despite the simple device.

The classification of the main faults includes:

  • Complete absence of engine plant
  • Engine starts and stalls
  • Unstable tool performance
  • Stop under load
  • Loss of power.

If the chainsaw does not start at all, the reason may be:

  • Manufacturing defect
  • Lack of fuel
  • Problems with starting the ignition system
  • No spark from spark plugs
  • Poor fuel mixture
  • Carburettor clogged
  • High voltage wire problems
  • No compression.

Why does the chainsaw start and stall, what to do in this case? The reasons for this need to be considered in detail.

Why the chainsaw does not start well and stalls

With a poor start of the equipment "to cold" the problem may be in the absence of compression, ie. The rings are worn out due to a long service life, they need to be replaced. Sometimes the reason that the engine does not start well in an unheated state is a problem with the muffler, as well as poor contact between the plug and the wire.

Also, the reasons for a poor start can be wear or damage to the gasket, rubber cuff in the accelerator pump of the carburetor, which causes an additional air flow, leading to an increase in saw speed.

Troubleshooting

The operation of the equipment must be correct, with periodic inspection of the constituent elements to prevent damage. To troubleshoot, it is necessary to check all components of the equipment for their functioning.

If the chainsaw starts and stalls, the cause can be eliminated on your own. If it is a shortage or improperly prepared fuel mixture, it must be corrected. For prophylaxis during the idle time of the chainsaw, you should always drain the remaining fuel.

Spark plugs should be checked periodically. In this case, remove carbon deposits that clog the joint gap, and also check the tips for the presence of fuel. Another cause of spark plug problems can be gasoline getting wet. To do this, they need to be removed, wiped off with a rag and left to dry. Defective spark plugs are replaced.

If there is no spark between the spark plug and the high-voltage wire, but if there is a good connection, the ignition unit must be replaced.

A clogged muffler is a common cause of breakdown, in which the chainsaw starts up and immediately stalls. To eliminate the malfunction, you need to dismantle the muffler, clean it from carbon deposits using sandpaper or a special chemical solution. If the model of the chainsaw is non-separable, chemicals are poured into the system and are there for several hours, then it is blown.

The carburetor must be adjusted if the chainsaw stalls at idle speed. Fine tuning is a rather laborious process, so it is usually done in service centers. But, on some models there are elements for adjusting it, it is enough to turn the bolt half a turn to increase the speed of the chainsaw, the problems will be eliminated. If the jets, nozzles, channels and filters are clogged, the entire carburetor must be disassembled and cleaned. When oil seals, gaskets, cuffs are worn out, it is necessary to replace them, preventing air leakage.

If there is a problem with the fuel or air filter, replace the fuel pump or clean the air filter.

If the breather is clogged, it must be cleaned with a regular needle.

When the chainsaw starts up and immediately stalls, the reason may lie in the malfunctioning of the chain. To troubleshoot problems, check the presence of oil in the chain lubrication container, as well as the oil return pipe for breaks or blockages.

When inspecting the piston group, pay attention to the cylinder; if necessary, replace it or the piston. The cylinder can be bored to fit the new piston. If the piston with the cylinder is normal, you should pay attention to the defects of the piston rings and the need to replace them.

Among other things, you should monitor the service life of the parts specified in the product passport, which include the drive sprocket, tire, chain, part of the anti-vibration system, and replace them in time.

If the tool is idle for a long time, it is worth checking the condition of the fuel line. If the tube is cracked, you will have to replace it with a new one.