Husqvarna chainsaw does not start well when cold
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.
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.
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 figure out 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 the chainsaw starts up and immediately stalls
- Malfunctions leading to improper operation of the chainsaw
- Summing up
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. 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 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 the chainsaw starts up and immediately stalls
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, inside the engine at the time of its malfunctioning, processes will take place that irreversibly lead the saw to the most serious consequences, for example, the piston melting, crankshaft jamming.
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 idling. 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.
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 discusses the consequences of its malfunctioning HUSQVARNA 142.
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.
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.
Chinese chainsaw does not work
First of all, what I would like to note is that Chinese devices are quite reliable and powerful, at least as practice shows. And the reasons for its breakdowns are not much different from all other models from other manufacturers. But there is one feature that does not tolerate negligence regarding Chinese chainsaws, namely the fuel that is poured directly into it.
It is the low quality of fuel and oil that are used to prepare the mixture that is the main and probably the only reason that you cannot start a Chinese-made chainsaw.
Since many “smart people” believe that the main thing is to fill, and what to fill does not matter, and so it will do. And then they wonder why the device does not work.
Therefore, special efforts are not needed to eliminate this problem, just use oil and gasoline from the manufacturer who “created” your chainsaw and everything will be fine. For more details look at
Why does not it run on hot
Before starting to solve this problem, it should be noted that the productive and correct operation of the engine depends primarily on the speed through the use of a starter mechanism. In most models, this “minimum” level is 800 rpm. An important fact is that the main reason for the “not factory” of the chainsaw is the usual flooding of the engine.
In order to eliminate this problem, it is first of all necessary to put the damper (air) in the middle position. After that, blow it a couple of times to start the chainsaw. After the process has started, warm it up within ten seconds, then put it into running (idle) mode. After carrying out these manipulations, you can fully open the damper (air).
After that, it is worth noting that before starting the direct implementation of actions regarding the “prescribed recommendations” try to start the device directly in the idle position. To do this, simply pull on the “rope”. Since if the engine is not hot, then the plant will be produced without any problems.
But if you do not succeed, it means that it is already cooled down enough. In this case, fix the half-gas according to the instructions in the instructions that came with your chainsaw.
But if this does not help, in this case, you should directly turn the cold-running screw, directly clockwise.
Remember that the higher the RPM level in your device, the easier it will be for you to start the device. And remember that the chain must be motionless relatively cold running.
We analyze the possible causes of the breakdown
You can find why the tool does not start in the instructions itself. But the instruction is not always at hand.
Although each model has its own characteristics, in general, everything is similar. Therefore, I will tell you the possible causes of breakage and possible ways to eliminate them for different tools.
The first and almost basic element of the chainsaw is the engine, namely the carburetor two-stroke (see carburetor adjustment). Its immediate power is varied, it all depends on the model of the device and its direct purpose. For example, the power of the Ural chainsaw is 3.68 kW.
The second no less important part of the tool is the headset (saw), which consists of a chain (cutting), a tire, a sprocket, a wheel (chain). It should be added to this that completely different manufacturers provide their own specific range of this headset.
It is important that it always needs to be matched directly to the specific characteristic data of the engine. Since the larger the pitch of this kind of headset, the deeper the cut of the chainsaw will be, one might even say that the more powerful and productive it will be. But do not forget that for the full operation of the device, the engine should also not be inferior to it in power.
It is lubricated by means of a special oil directly from the second tank, which is located on the hand unit. It is worth noting that the mass of this kind of tank has such features that the oil and fuel intended for the engine run out at the same time.
We figured out the general outlines of the device, and most likely with its basis, and now it’s time to start figuring out why the chainsaw stopped working, what reasons might exist, and how to fix them.
Separately about the breakdown of the most common model
Let’s take a closer look at the Stihl 180 problems:
- Clogged carburetor or fuel filter. These are the most common problems and are very easy to fix after cleaning. Sometimes the filter has to be changed;
- Replacing the spark plug;
- Sometimes the cylinder or oil seals need to be replaced.
The Stihl saw is strong and durable enough that you can often fix the breakage yourself. In fact, the same goes for the Partner, Ural, Makita and Husqvarna models.
If we find a malfunction of our chainsaw, we are looking for the cause with a small one, gradually checking and eliminating the problems. Such problems are easy to fix on your own. But if the breakdown is serious, and you do not have enough experience, then a specialist should deal with this.
We analyze the possible causes of the breakdown
Find why the tool is not starts up can be in the instructions itself. 2.6 there is a spark, the producing Husqvarna chainsaw does not start from the Russian one. Alas, not every time the instruction is available at home.
Although each model has its own characteristics, by and large, our client remains similar. Therefore, I will tell you the possible causes of breakage, not possible ways to eliminate them for different tools.
The chainsaw starts and immediately stalls
The reason for this kind of malfunction may be the pouring of a direct candle at the very moment when you are trying to start the chainsaw. Since a significant amount of gasoline is collected precisely between the electrodes of the spark plug, therefore, a spark cannot be created. You can fix this kind of breakdown yourself, and you do not have to contact specialized services.
It’s a good thing they couldn’t start this Husqvarna chainsaw
To do this, simply turn out the candle itself and dry it. You can also try to heat up, it will not be superfluous, but remember that this kind of manipulation must be carried out exclusively through a gas burner.
Otherwise, a specific carbon deposit may appear on the very surface of the direct electrodes. In the meantime, while your candle dries out, you need to drain the excess fuel directly using the hole and leave to dry for about half an hour.
We restore the work of the tool
To restore the saw, it does not matter whether the Ural or Stihl brand, you need to know the location of the breakdown.
First, we check and change the unusable fuel mixture. If the saw still does not start, then check further point by point.
The problem is the candle. we pull it out and dry it. In no case should you pierce it, because this will lead to a malfunction of the part. After 30 minutes after drying, you can put the candle back in, before that check if there is any fuel left in its place.
In addition, the candle can simply break, so it is better to have a spare to rule out the cause.
Another reason that the tool does not start well and stalls is poor contact between the spark plugs and the high-voltage wire. If everything is in order here, but there is still no spark, the ignition unit itself may have broken. Such a breakdown can only be corrected by replacing it.
The air filters should be checked and cleaned from time to time. If you have not checked it since the moment of purchase, then it could become clogged with dust and cause a malfunction.
In such models as Stihl 180, Ural or Partner 350 the breather is clogged, which often leads to breakdown. You can use a sewing needle to clean it.
On the Stihl 180, Druzhba, Ural and Husqvarna 142 models, the muffler sometimes gets clogged, it also needs to be checked and cleaned.
If the problem is in the carburetor, then without proper experience, you should not try to fix it. It is best to turn to specialists.
If, after checking and eliminating the above problems, your saw still does not start, then most likely the breakdown lies in the cylinder group.
When, upon inspection, you see damage and chips on the piston or cylinder assemblies, then these elements will have to be replaced.
If the cause of the chainsaw malfunction is the pipes that are leaking, then most likely not enough lubricant is supplied to the chain. To eliminate the problem, the tubes are just replaced, and the joints are covered with sealant.
Chainsaw won’t start? Here’s how I fixed mine
The parts of the mechanism cannot last forever, so they will have to be changed periodically. To find out how long which part serves, you need to look at the instructions.
Chainsaw won’t start
Every person who is familiar with gasoline-powered tools knows that sometimes the equipment works intermittently, or it may stall at one moment and will not start again. There are a lot of reasons why the chainsaw does not start, we will try to consider the most common of them.
- Why does a chainsaw start badly
- Fuel and air filter
- Reduced compression
- Carburetor adjustment
- Spark plug
- Ignition coil
- The gap between the ignition coil and the flywheel
- Chainsaw will not start when hot
- Malfunctions in the ignition system
- Fuel system problems
- Chainsaw does not start well when cold
- Violation of the sequence of actions when starting on a cold
- Fuel problems
- Malfunctions in the engine
- Chainsaw stalled and won’t start
- Engine jammed
- Broken fuel line
Broken fuel line
During the operation of the chainsaw, vibration occurs, which can cause damage or breakage of the fuel line of the chainsaw. In this case, the chainsaw will stall and it will be impossible to start. To diagnose a malfunction, you need to conduct an inspection and determine the presence of fuel leaks.
Malfunctions in the engine
CPG seizure, ring sticking, CPG wear, air leakage through oil seals and gaskets, compression loss, all these problems can make starting the chainsaw impossible or significantly complicate it. For example, if the CPG is not significantly worn out, the compression in the engine decreases. In this case, starting on “cold” will be significantly difficult, or the saw may stop starting, and on “hot”, the tool will start well.
It is quite difficult to accurately diagnose problems in the engine associated with problems in its start, and it is better to turn to a specialist in this field for this.
One of the frequent cases of difficult starting of a chainsaw is wear of the CPG (cylinder-piston group).
As you know, for the normal start of a chainsaw, compression must be present in its engine. It is necessary for the normal compression of the fuel mixture in the engine cylinder, it also affects the operation of the fuel pump.
During the operation of the tool, the value of the compression ratio falls, and the chainsaw starts to start poorly.
The reasons for the lack of compression, or its reduction, may be natural, because the engine wears out during operation. Also, problems can be caused by a serious breakdown, for example, a seizure of the CPG, or a broken piston ring.
A sign of reduced compression is a weak resistance of the starter when starting. With reduced compression, a decrease in the power of the chainsaw is observed, which negatively affects its performance. The problem is eliminated by replacing the piston rings, or completely by the CPG.
The reason that a new chainsaw does not start, or does not start well, may be the ignition coil. Modern chainsaws are equipped with electronic ignition coils. This part cannot be repaired, and, as a rule, if there is a defect, it changes completely.
Malfunctions in the ignition system
If, when inspecting the spark plug, it is found that it is wet and sparking on the contacts does not occur, this means that the problem should be looked for in the ignition system, inspect the coil, check the gap between the flywheel and the coil contacts. You can also check how tightly the cap of the high-voltage wire sits on the candle, and the candle itself. Try to replace it with a new one.
Chainsaw does not start well when cold
Identifying and eliminating obvious chainsaw malfunctions.
To determine the reason why the chainsaw does not start or stalls when starting, it is necessary to troubleshoot the tool. The essence of the procedure is to consistently inspect the condition and operation of the main working elements of the saw motor. At this stage, we check:
- Spark plug present;
- Fuel supply;
- Filter status;
- The operation of the breather of the stalling unit built into the fuel cap;
- Discharge duct function.
to the content
Chainsaw outlet check.
One of the reasons that a chainsaw does not start well may be a clogged exhaust channel or its muffler. At the same time, a drop in power is noted in the process of sawing sawn timber and logs. This is most often due to resinous deposits on the spark arrestor or muffler channel, which are formed during the combustion of a poor-quality mixture of gasoline and oil, which impede the removal of exhaust gases.
Resonator clogged with carbon deposits can cause poor starting of the gasoline saw.
Eliminate the reason for the poor start of the chainsaw, in this case, you can remove the accumulated combustion products. To do this, perform a number of manipulations:
- Remove the muffler by unscrewing the screws;
- Remove the cooling panel and gasket;
- Remove the spark arrestor;
- Disassemble the resonator housing;
- Wash all elements from carbon deposits with a detergent;
- Let them dry completely;
- Collect everything in reverse order;
To prevent dust and sand from getting into the cylinder when cleaning the muffler, cover the outlet of the chainsaw engine with a clean rag.
Determine the availability of fuel and its supply.
First you need to make sure that there is a fuel mixture in the tank of a chainsaw that does not want to start, and it regularly enters the carburetor. With a full tank, we check how the mixture is fed through the gas line. We disconnect the fuel system pipe from the carburetor and try to pump it up. In the case of a complete order, when pumping up, gasoline will be supplied in jerks in accordance with the norms set by the manufacturer. Poor or no fuel supply may result from:
- The fuel supply channel is clogged;
- Debris-clogged fuel filter.
Often the reason for a poor start of the chainsaw can be a tank that is too full. In this case, you should pay attention to the presence of smudges under the saw case cover. If present, see the connection of the gasoline feed pipe to the carburetor. Most often, it is squeezed out by pressure when the tank cap is screwed on, which is filled under the very neck, which prevents the engine from starting.
The quality of the fuel mixture can also be one of the reasons why the chainsaw does not start. If, after completing the work, the remaining gasoline is not drained, and the tool is left for long-term storage (more than 2 weeks), then the processes of resinification and polymerization of the components will begin to occur inside the tank. What can cause carbon deposits on the piston, rings and cylinder liner. Therefore, always prepare the mixture only in the required amount before work.
Checking the breather and cleaning it.
The breather is another element, from the improper operation of which the chainsaw may not start or stall during the sawing process. This element is located on the fuel tank cap in the area of the air hole. This is a kind of valve that does not allow gasoline to flow out and equalizes the air pressure required for the free flow of fuel into the carburetor.
If the breather is dirty, the working chainsaw stalls, and when it starts, it refuses to start. The thing is that air stops flowing through the hole. As a result, a negative pressure (vacuum) is created inside the fuel tank, which prevents the flow of gasoline to the carburetor.
Defining the problem is pretty straightforward. Disconnect the fuel hose from the carburetor and see what happens to the gasoline. If it flows freely in a good trickle, then everything is in order with the breather. If it is absent or it flows weakly and intermittently, then the reason is identified. the breather is clogged with dirt. You can solve the problem by cleaning the air hole with a regular needle or a powerful jet of compressed air.
Finding reasons why the chainsaw won’t start
Amateur and professional chainsaws are complex devices. The service life of their two-stroke engines, components and assemblies has its own limitations. For this reason, quite reliable and expensive tools, along with cheap Chinese units, periodically fail and refuse to start. The situation when the chainsaw does not start or stalls is not very pleasant and sometimes confuses the user. How to identify and correct a malfunction by returning the instrument to work.
- Identifying and eliminating obvious chainsaw malfunctions.
- Checking the spark on the spark plug and eliminating the causes.
- Determine the availability of fuel and its supply.
- Checking the condition of the fuel and air filters.
- Checking the breather and cleaning it.
- Chainsaw outlet check.
- What to do if the chainsaw won’t start further?
Checking the condition of the fuel and air filters.
If everything is in order with the fuel quality, the chainsaw engine may not start due to clogged fuel and air filters. To diagnose these elements, it will be necessary to perform a number of manipulations associated with their dismantling.
For the fuel filter:
- Disconnect the gasoline supply channel from the carburetor;
- Pump up fuel.
If there is little or no pressure in the branch pipe, disconnect the filter. Before this, free the tank from the mixture and remove the filter element itself. Dismantling is done with a wire hook. A clogged replacement cartridge that causes a poor starting of the chainsaw engine can be cleaned, but it is best to replace it with a new one. When using the tool in dusty conditions, it should be cleaned on a regular basis.
A clogged air filter can cause the chainsaw engine to run erratically, making it stalling or difficult to start. Dust and dirt deposited on the adsorbent material impede the flow of air into the system, make the fuel mixture so rich that it will sometimes be difficult to start the tool.
Checking the air filter is one of the first steps in finding the cause of a poor start.
Care should be taken when removing the air filter, as dust accumulated on the surface of the saw during operation can enter the carburetor. And this is fraught with more expensive repairs. After detaching the cartridge, thoroughly clean it of accumulated dirt and rinse it with the addition of detergent. Dry the element and put it back in place just as carefully.
Checking the spark on the spark plug and eliminating the causes.
The first step in looking for reasons why your gasoline saw won’t start is to check the spark on the spark plug. There are many factors that affect the performance of this element. However, the main ones at the initial stage of instrument troubleshooting are:
- Incorrect carburetor adjustment;
- The presence of more than it should be, the amount of oil in gasoline;
- Clogged air filter.
All of them contribute to the formation of carbon deposits on the spark plug electrodes. In 50 cases out of 100, the saws do not start on a cold one due to the absence of a spark due to carbon deposits on the electrodes and their corrosion. As a result, the gap either decreases or increases.
Checking the spark plug with an idle chainsaw
It is quite easy to check for a spark. This will require:
- Remove the tip of the high-voltage wire;
- Unscrew the candle;
- Put the tip back on;
- Lean the candle with a skirt against the cylinder;
- Start with a starter.
If a good spark is observed between the electrodes at the time of starting the engine of the chainsaw, then everything is in order with the ignition unit. If it is not there, then it is worth cleaning the element itself and checking the gap of the electrodes. If necessary, use a special probe to adjust the distance between the contacts.
For candles from different manufacturers, the distance between the electrodes may fluctuate. For some, it may be equal to 0.5 mm. Others have 0.2 mm. Therefore, carefully study the manufacturer’s recommendations.
There may be no spark on the spark plug for other reasons. Of the main faults affecting the poor start of the chainsaw and the unstable operation of the internal combustion engine at idle, from which the tool can stall, the following can be attributed:
- Overflow of the spark plug channel with fuel;
- Lack of contact between the high-voltage cradle and the tip of the candle;
- Failure of the ignition unit.
How to start a cold chainsaw if the spark plug channel is constantly flooding with gasoline? To eliminate the problem while starting the tool, you can use the following algorithm:
- Unscrew the candle with a special key;
- Wipe it with a clean and dry cloth;
- Dry for 20. 30 minutes;
- Remove carbon deposits with a file and adjust the gap between the electrodes;
- Drain the remaining fuel from the spark plug channel and dry it;
- Collect everything and try to start the mechanism.
Husqvarna Chainsaw Hard Start- FIXED!
As a rule, these measures are enough to start the chainsaw and get the job done. However, this extreme measure does not eliminate the main reason why the engine does not start or stalls. improper operation of the carburetor, which needs fine adjustment.
If there is no spark and poor contact of the high-voltage cradle with the spark plug tip, check the connection. The check can be carried out using a conventional tester. If a defect is found and it is eliminated, the chainsaw should start without any problems.
If the check showed that the contact is reliable, and the saw does not start further, look for the cause in the ignition unit. As a rule, a faulty unit cannot be repaired and restored. A complete replacement is required here.