Why does the chainsaw stall at high speeds?
What to do if the chainsaw stalls at idle
The chainsaw stalls at idle: many owners of this tool face this problem. By its own device, it saw a fairly light tool. But there are times when it fails.
The main problem in troubleshooting is determining the correct cause for abnormal operation.. Why does the chainsaw not start or stall at idle? There are times when a chainsaw stalls at idle.
Once the cause has been identified, repairing the defect is usually quite simple.
Chainsaw device diagram.
Probable Reasons for Failure
The power unit of all chainsaws is a single cylinder internal combustion engine. Husqvarna 135 stalls at the Stihl 180 large chainsaw. At very high speeds. Stihl 250 chainsaw when pressed on gas stalls when pressed on gas.
For devices of this type, malfunctions such as a violation inside cylinder compression, a change in the ratio of the fuel mixture, incorrect ignition, poor-quality fuels and lubricants are typical.
The main problems in the operation of the power unit are as follows:
- the engine runs stably at minimum speed, but stalls with increasing speed;
- start-up is normal, and idle is unstable, quickly stalls;
- does not start.
Chainsaw electronic ignition circuit.
Abnormal idling can be caused by various reasons. They can be divided into several positions:
- reduced filter capacity (gasoline and air);
- abnormal operation of the ignition system:
- carburetor settings have changed spontaneously;
- malfunction of the elements of the gas pipeline;
- clogged exhaust ducts, silencer;
- defects of the piston, cylinder, valves.
Repair must begin with an external inspection and check for fuel in the tank.
Check and repair filters
The engine may malfunction or stall when there is insufficient fuel or air. Reasons. clogged air or fuel filter. To check the fuel filter, it is necessary to remove the hose of the gas line from the carburetor fitting and direct it to some container.
Then press the fuel pump several times. If the fuel is pumped normally, in clearly expressed doses, without dirt, then the fuel filter is working. the chainsaw stalls on Partner 351 does not hold idle, the course of soaps carburetor-blew revs.
If the jet is weak or fuel is not pumped at all. the filter must be replaced or cleaned if possible.
Clogging the fuel filter with sawdust is one of the reasons for a chainsaw breakdown.
The device must be removed from the fuel tank (after draining all fuel from it). In most models, the fuel filter can be hooked out of the wire through the neck. If the filter design is collapsible and can be cleaned, disassemble and rinse in accordance with the manufacturer’s recommendations. In another case, change to a new filter.
Similar problems can occur when the air filter is clogged with dust, sawdust, or dirt. If there is not enough air, the fuel mixture will be enriched, the process of burning fuel is difficult.
To check, remove the filter. When working, you need to take precautions so that dust does not enter the carburetor. The device must be cleaned and rinsed in warm water with the addition of detergent. After drying, if possible, blow with low-pressure compressed air, replace. If the chainsaw works fine, then the reason is eliminated, if not, you need to look further.
With constant use of the tool, it is recommended to replace the filters of the fuel and air systems after 3 months.
The chainsaw stalls when you press the gas
Chainsaw stalls when you press the gas. Chainsaw Partner 370 began to stall at the slightest pressure on the handle.
Chainsaw stalls when pressing on gas. The chainsaw stalls when you press the gas.
The video addresses a fairly common malfunction chainsaws and 100% carb setting method. How is this done.
Checking the spark plug and ignition system
According to the recommendations of manufacturers, the spark plug should be changed annually, regardless of the intensity of operation of the tool. Failure to comply with these tips leads to a completely logical result: failures at idle, subsequent failure.
Typical defects in the ignition system are as follows:
Faulty chainsaw candles.
Check and repair carburetor
The principle of operation of the carburetor chainsaw.
If checking the ignition system, fuel filters, muffler did not give tangible results, the tool still does not want to work at minimum speed, you need to check the carburetor.
To adjust the operating modes on the device body are three screws designed to set the minimum rotation speed, maximum speed and idle speed.
On many models, manufacturers install only the idle adjustment screw to avoid incompetent attempts to adjust the device. In all versions of the device, the adjustment must be performed exactly according to the recommendations of the manufacturers.
If the adjustment of the device did not lead to the restoration of the normal operability of the tool, it is necessary to completely disassemble the device with inspection. It should be understood that the carburetor is a rather complex device, in the absence of experience it is advisable to consult specialists.
When disassembling, it is important to carefully inspect and flush all jets, air and fuel channels, and the filter screen. Damaged items must be replaced with new ones. The jets must be cleaned with a soft wire of the appropriate diameter.
It is advisable to carry out the work in appropriate conditions. Why does the chainsaw stall when I press the gas ? The carburetor contains many small parts, the loss of any of them will make the device inoperative.
Check and repair the muffler
Clogged silencers should be left to soak in warm water with detergent, then wiped and dried thoroughly.
A muffler malfunction leads to a drop in the power of the tool during operation and stops in idle mode. Despite the apparent simplicity of this part, it is also important to monitor it. Quite often, the silencer is clogged. When working, it is possible that wood dust, sawdust, and resin particles get on the grate.
High temperature contributes to their adhesion and accumulation, exhaust gases also form deposits on the surfaces of the spark arrester and other parts. Chainsaw. stalls at high speeds. Change gasoline filter to a new one. Increasing over time, the layer reduces the capacity of the silencer and interferes with the normal removal of exhaust gases.
The engine, figuratively speaking, is suffocating.
Repair of this unit is not difficult, quite possible for many tool owners. The device should be removed from the engine, cover the holes with a rag or other material.
If the resulting layer is too hard, all parts can be left to soak in warm water with a detergent. After plaque softening, the parts should be washed with a rag or soft brush and wiped thoroughly.
Inaccessible places can be blown with compressed air or blow dry. The use of mechanical means of removal is undesirable.
For the muffler to function normally over a long period of use, lubricants recommended by the manufacturer should be used, monitoring their expiration dates. The mixture must be prepared immediately before work and completely consumed.
Conclusion on the topic
Chainsaws, like most tools, require timely maintenance and care.
Failure to comply with this rule leads to tool failure, material costs, loss of precious working time at the most inopportune moments.
What to do if the chainsaw starts and stalls. look for reasons
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.
- 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.
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.
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.
A video 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.
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.
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.
Why the chainsaw stalls, the main reasons
Although the chainsaw is a simple device, from time to time there are problems in its operation, which can be eliminated only by disassembling. The following faults can be cited as examples:
- Chainsaw is not gaining momentum;
- chainsaw ceases to function in the cut;
- the chainsaw starts and stalls;
- chainsaw loses its power;
- chainsaw stalls when pressed.
Most often, malfunctions are associated with interruptions in the functioning of the motor, as well as with malfunctions of other systems and nodes. Of great importance is the proper handling of this technique.
When all the rules of use are followed, the problems with a high probability lie in the most obvious.
When searching for the causes of malfunctions, it is advisable to start by checking the simplest part of the chainsaw and ending with the most difficult.
Checking the main chainsaw systems
If the chainsaw refuses to work normally, you need to make sure that all the conditions required for its normal functioning are provided:
Then it is necessary to consistently check the functioning of all its elements. First you need to check the fuel tank. If the cause is not in volume and not in fuel quality, then the spark plugs may be the probable cause of the malfunction. The clearance at the candle should not exceed 0.5 millimeters.
If it is too small, it means that soot has deposited on candles. In this case, remove the candles, clean them, and then reinstall them 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 the fuel filter is a simple task, but the carburetor repair is best left to specialists.
Chainsaw starts and stalls. reason
If the chainsaw starts and stalls When trying to do the job for the first time, the cause may be a problem with the chain brake or its jamming due to lack of lubrication. In this case, measure the oil level. If the amount of lubricant is sufficient, the cause may be a tube that leads to the lubrication mechanism.
Another reason could be a carburetor breakdown. If he needs only adjustment, it can be done independently in accordance with the instructions. If the carburetor needs to be cleaned or repaired, then do not do without the help of professionals.
Another possible cause of this malfunction is the low fuel level in the tank. In this case, the chainsaw stalls when tilted, since the remainder of the fuel mixture is in the part of the tank opposite to the place where the suction tube is located.
Why chainsaw stalls when heated
It often happens that a chainsaw starts up cold, but stalls during heating. This behavior of the tool can be caused by the following reasons:
- The carburetor is incorrectly configured. This problem can be identified by how the device starts up to a cold one. If it is done without closing the air damper, and the engine starts without a preliminary flash, this means that after heating the engine, fuel fills the spark plug. The solution to this problem is to adjust the carburetor. Carburettor Adjustment Details
- Malfunction of the coil (ignition module). This problem can be detected 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 the ignition coil must be replaced.
- Faulty spark plug. In this situation, as with a malfunction of the ignition module, the spark disappears when the engine is heated. It is necessary to replace the spark plug with a new one, and if this does not lead to a solution of the problem, then the ignition module and the distance between it and the flywheel should be checked.
Video: Chainsaw High Speed
Why the chainsaw stalls under load
Sometimes a chainsaw is unable to function normally under load. Most often, this is caused by improper adjustment or leaking carburetor.
In addition, the cause of this problem may be air leaks through the carburetor gasket or crankshaft oil seals.
A tool that is unable to function under load also cannot confidently maintain idle speed.
Diagnostics begins by checking the carburetor and crankcase for leaks. If air leaks are detected through the crankshaft oil seals, their replacement is required. If air leaks are detected in the carburetor, a repair kit for the gaskets is required to solve the problem.
If these actions do not lead to the desired result and the crankcase of the engine with the carburetor is tight, then you need to adjust the carburetor.
If the Husqvarna chainsaw stalls under load, then for any abnormalities in the functioning of the motor, first of all, check the impulse hose, as this is the most common cause of breakage of chainsaws of this brand.
What to do if a chainsaw dies 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 needs to be done to solve this problem? In this situation, you must perform the following steps:
- check fuel filter;
- inspect fuel hoses for leaks;
- check the muffler;
- try to add a little speed;
- check the condition of the rubber seals on the crankshaft.
Why the chainsaw is not gaining momentum and stalls
If the saw cannot gain momentum or stalls when you press the gas, then most likely this is caused not by the tightness of the carburetor or the crankcase. This problem is resolved by checking for leaks and adjusting the carburetor.
In addition, this malfunction may be due to a defect in the fuel tank breather.
Due to the formation of vacuum in the fuel tank during the operation of the chainsaw, the required volume of the fuel mixture does not enter the engine, as a result of which it cannot gain speed or stall.
If you stop the chainsaw, open and close the fuel tank and turn it on again, it will normally work for about five minutes, and then again will cease to gain speed or stall.
Another possible reason that the chainsaw is not able to gain speed may be an excess of soot in the muffler, which makes it difficult to exhaust the exhaust gas, which reduces the power and speed of the motor.
Chainsaw is not gaining momentum. causes and DIY repair
Faults occur both in expensive German or American chainsaw modifications, and in their cheap Chinese fakes.
It’s nice when the moment the motor tool starts up smoothly: the saw warms up and gradually reaches the rated power declared by the manufacturer, which is issued throughout the entire working cycle.
Things are worse if ate everything happens the other way around: after tugging at the gas cable, the unit starts to slip, runs jerkily after short pauses, stalls and starts up again from the pusher.
The reasons for this phenomenon can be many, as well as scenarios. We consider in detail each working situation and the breakdowns that preceded them.
What if the chainsaw does not keep idle?
Problems with idle are considered constant companions of chainsaws. There can be several prerequisites that could lead to dithers at the moment of start-up and scrolling of the chain when idling: the main ones are:
- litter of the air and gas filter;
- poor-quality fuel mixture or its improper preparation;
- problems with the ignition module;
- a carburetor whose settings no longer correspond to the load on the saw;
- motor elements are deformed or rusted.
Consistently perform a number of actions:
- flush the fuel hose or replace it with a new one,
- They clean the air filter, which could become clogged with sawdust and dirt particles. Modern air filters are reusable, they can be washed with the addition of detergent, completely removed from the saw body;
- check gasoline and engine oil, which may be of poor quality or simply not suitable for working with this saw;
- test candles and carburetor.
Eliminating one or more possible malfunctions usually returns the saw to its former strength.
Why is the chainsaw not gaining momentum?
Launching is a complex multi-level process in which practically all saw life support systems are involved. That is why the fact that the chainsaw is losing momentum turns on intermittently and feels confident only at idle should be considered from different angles.
The following factors could lead to this:
- a faulty motor — its motor resource could be exhausted, and the piston rings and cylinder could wear out, deform, or even succumb to corrosion;
- a failed spark plug or the coil itself. as a result of this, the spark necessary for igniting the air-fuel mixture does not form;
- imbalance of carburetor screws, as well as a number of reasons that could disable it.
The chainsaw does not develop speed: we test the device for malfunctions
The ignition module can be diagnosed visually for malfunctions. To do this, you need:
- turn out the candle;
- evaluate its appearance (it should not be filled with gasoline or contain a black coating);
- check the distance between the coil and magnets (up to 0.2 mm);
- if necessary, examine the spark plug unit for spark supply using a working mains cable.
If, after checking the defects, it was not found, it is worth going to the inspection of the carburetor block.
This work unit is one of the most vulnerable in modern chainsaws. New tools that go on sale from the factory have basic settings. for low and high revs, which must be reinstalled after running in and running in all the parts. Similar actions are performed if the saw does not develop a thrust corresponding to the maximum torque according to the instructions.
The figure shows a typical three-core adjustment circuit.
In this case, one of them needs to be reconfigured. “N” jet, responsible operation of the saw under load. To do this, it is enough to adjust the fuel supply with the engine turned on at the highest speed of rotation of the chain, using the tachometer and operating instructions.
Other chainsaw malfunctions
A lot of users are in trouble when a chainsaw does not take off. In a matter of seconds, the device reaches its maximum power, which cannot be reduced.
This may be due to the fact that:
- the throttle does not work. its spring or thrust element has weakened;
- the toggle switch is poorly switched;
- throttle shaft lost a corkscrew.
But there may be a reverse situation. when the saw is gaining power uncontrollably. The reasons why the chainsaw itself is gaining momentum should be sought in:
- carburetor. it must be cleaned or reconfigured;
- fuel supply system. gas filter, fuel hose;
- malfunctions of piston or nozzles connecting them to the carburetor.
There are a lot of failures that manifest themselves through revolutions that are atypical for a specific part of the working cycle. But a careful attitude to the tool will help to diagnose them in time and return it to normal operation.
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 has the ability to fail, despite the simple device.
The classification of major faults includes:
- complete lack of engine plant
- engine starts and stalls
- unstable tool operation
- work stop at load
- power loss.
If the chainsaw does not start at all, the reason may be as follows:
Why does the chainsaw start and stall, what should I do in this case? It is necessary to consider in detail the reasons for this.
Chainsaw starts and stalls: reason, video
The reason that the chainsaw may stall right after the factory is due to a malfunction of a certain part of the equipment.
Why the chainsaw starts up badly and stalls
With a poor start up of the equipment “on a cold”, the problem may be in the absence of compression, i.e. the rings are worn out due to the long service life, their replacement is required. Sometimes the reason that the engine starts poorly in an unheated state is a problem with the muffler, as well as poor contact between the spark plug and the wire.
Also, the reasons for a poor start can be wear or damage to the gasket, rubber cuff in the carburetor accelerator pump, due to which there is an additional flow of air, leading to an increase in the revolutions of the saw.
Troubleshooting
The operation of the equipment must be correct, with periodic inspection of the constituent elements to prevent breakage. To troubleshoot, it is necessary to check all components of the equipment for their functioning.
If the chainsaw starts and dies, the cause can be eliminated on its own. If it is a shortage or improperly prepared fuel mixture, you need to fix it. For prophylaxis during the idle time of the chainsaw, the remaining fuel should always be drained.
It is necessary to carry out periodic check of spark plugs. In this case, remove carbon deposits that clog the joint gap, and also check the tips for fuel. Another cause of malfunctions with spark plugs can be their wetting with gasoline. To do this, they need to be removed, wiped with rags and left to dry. Defective candles are replaced.
If there is no spark between the spark plug and the high-voltage wire, but if they are well connected, the ignition unit must be replaced.
Muffler clogging is a common cause of failure, in which the chainsaw starts and immediately dies. To eliminate the malfunction, it is necessary to dismantle the muffler, clean it from soot using sandpaper or a special chemical solution. If the chainsaw model is not 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 idling. Fine tuning is quite a time-consuming process, so it is usually done at service centers.
But, on some models there are elements for its adjustment, it is enough to turn the bolt half a turn to increase the revolutions of the chainsaw, the problems will be eliminated. If the nozzles, nozzles, channels and filters are clogged, the entire carburetor must be disassembled and cleaned.
When the seals, gaskets, cuffs are worn, it is necessary to replace them, preventing the "suction" of air.
If you have problems with the fuel or air filter, you must replace the fuel pump or clean the air filter.
If the breather is clogged, clean it with a regular needle.
When the chainsaw starts and immediately dies, the cause may be a malfunction of the chain. To eliminate problems, the presence of oil in the chain lubrication tank is checked, as well as the oil exhaust pipe for breaks or blockages.
When inspecting the piston group, you should pay attention to the cylinder, if necessary, replace it or the piston. You can bore the cylinder to fit the dimensions of 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, it is necessary to control the service life of the parts indicated in the product passport, which includes the drive sprocket, tire, chain, part of the anti-vibration system, and replace them in time.
With a long idle 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.
Why does the chainsaw stall when I press the gas?
Hello! If you are on this page, then, most likely, your chainsaw stalls when you press the gas, and you want to know what it is happening with and what to do about it. Well, I’ll try to help you in this problem by analyzing the most common causes of such a misfortune, as well as methods for eliminating them.
To begin with, I’ll immediately write for novice users that many chainsaws require an engine to warm up at idle for about one minute before operation. Until the engine warms up, the saw may stall when gas is added.
So, if a heated chainsaw can idle, but stalls when loaded, then this means that:
- incorrectly tuned or clogged carburetor. the most common case;
- it lacks air, the consumption of which increases sharply with increasing revolutions. this means that the air filter is dirty (a rare case, since the filter is dirty gradually, so the user first notice a power loss);
- she lacks fuel, the consumption of which also increases with increasing speed. this means that the fuel filter is dirty (also an infrequent case);
- Well, the most unpleasant case, if there is excessive friction between the piston and the cylinder wall due to a lack of oil in the fuel mixture. after this operation of the chainsaw, you will most likely fly into the repair of the piston group, as on the piston and cylinder walls there are seizures that prevent the work of the saw.
We will analyze these cases separately.
Not enough oil in the fuel mixture
First, we will analyze the most unpleasant case. Why? Because before doing manipulations with the filters it is better to make sure that your oil and gasoline are mixed in the correct ratio.
Here, however, it is worth noting that if your saw has already been started many times (for example, about ten times), but it continues to start, and then stalls again with an increase in speed, then everything is apparently in order with the fuel. Otherwise, it would have simply stopped starting up at all.
But still, I recommend immediately dispelling the slightest doubt about the quality of the fuel, as soon as the saw you stalled when you set speed for the first time.
Because, if the reason is in fuel, then, as already mentioned above, you can get into expensive repairs. And so, it can still do.
To dispel doubts is to drain the old fuel from the tank and pour freshly prepared, in which the oil and gasoline are mixed in the correct proportion.
The correct ratio is best seen in the instructions for the saw. If you have lost it, then look at the ratio on the package of oil. Usually it is 1:50 or 1:40. If “non-native” oil is used (well, for example, Stihl will also have little “native” for Stihl chainsaws), then I recommend using a ratio of 1:40, even if 1:50 is written on the package with oil.
For an accurate dosage, I personally use a medical syringe and a measuring container in which one liter of gasoline can be clearly measured. I pour a liter of gasoline into a container, fill in a syringe with 25 (at 1:40) or 20 (at 1:50) cubes of oil and add it to gasoline.
After preparing a new mixture, merge the previous mixture from the tank, in which we are unsure, and fill in the freshly prepared one.
Now that you’ve done everything to dispel any doubts about the quality of the fuel, we proceed to further steps.
As I wrote above, with a lack of oil on the piston and cylinder walls, seizures can form. and almost always form. If you are lucky and there are no badasses, then with a new fuel mixture prepared in the correct ratio, the chainsaw should start working normally.
If teasing has appeared, then the saw may start and stall several more times, after which it will cease to start at all. In this situation, I sympathize with you, since, most likely, now you will need to make a replacement piston group, which will cost a lot of money.
If the saw, as before, starts and stalls at high speeds, then we carry out manipulations with the filters.
Air filter is dirty
Making sure the air filter is dirty is pretty easy. You just need to remove it and start a chainsaw without it. if the saw is working properly, it means the matter is in it and it just needs to be changed or washed, depending on its type. And do not be afraid that the chainsaw will work for some time without dust protection. if there is no dust cloud around you, then everything is in order.
So, remove the air filter. To do this, you need to remove the cover from the upper upper part of the chainsaw, which can be fastened either with screws, or simply with some kind of lock, which you just need to turn or snap off.
If the saw is working properly after removing the filter after starting, it means that it is dirty.
The air filter is either felt or nylon. The first resembles cotton wool or synthetic winterizer, and the second looks like a fine mesh of nylon threads stretched on a plastic case. Felt need to be replaced with a new one, but nylon can simply be washed in soapy water, dried and put in place.
Nylon Filter
Well, then we calmly use a chainsaw.
Fuel filter is dirty
If the option with an air filter does not suit you, then try to change the fuel. It is located in the gas tank and is attached to a hose through which fuel is taken from the tank.
This hose must be gently pry off with something and remove from the gas tank its edge, on which the filter is fixed. Here, the option of working without a filter, as in the case of air, is better not to use, since you cannot know for sure whether there are any unnecessary impurities in the fuel.
So just change the fuel filter to a new one and try to work. If everything is fine, then congratulations. you have found a reason.
Carburetor Cleaning and Tuning
If all of the above did not help, then, apparently, tuning or cleaning the carburetor is required.
It is not recommended to do these procedures on your own, since most often such attempts all the same end with a trip to the service. So it’s better to immediately go there and do not disassemble anything yourself.
But if you still want to dig deeper into it yourself, then it’s best to watch a video that shows how experts do it:
The chainsaw starts and stalls. Why? Agrotechservice
There are several simple rules for the operation and maintenance of chainsaws, compliance with which will maximize its service life.
Preparing the correct fuel mixture, regular cleaning of filters and periodic replacement of parts will save you from the need to repair your tool for a long time. If it was not possible to avoid a breakdown, then you can figure out its cause completely independently.
This applies to all brands of chainsaws, starting from the more complex models “Husqvarna” and “Stihl” and ending with the simplest models “Makita” and “Patriot”.
Chainsaw stalls immediately
What to do if immediately after starting the chainsaw stalls? First you need to check the 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 should have the highest possible octane rating, and the required brand of oil, as a rule, is indicated in the data sheet of the chainsaw.
Next, check the spark plug, as well as the contact of its tip with a high-voltage wire. The gap between them should be no more than 0.5 mm. If necessary, the candle is cleaned of carbon and dried.
It is recommended to occasionally replace the candle with a completely new one. The reasons why the tool stalls when you press the gas are hidden 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 dismantling and cleaning of the carburetor to the specialists of the service center.
Chainsaw stalls idling
Cases when the chainsaw stalls at idle are common. First of all, it is necessary to check the muffler, and, if it is contaminated, to clean from tar tar deposits. Also, on carburetors of some models and others, there are bolts with the inscriptions H and L. respectively, a rough and precise setting.
By adjusting the bolt L during operation of the chainsaw so that its revolutions increase (turning the bolt just enough half a turn), it is possible to eliminate this problem. Adjusting the carburetor requires the availability 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 when loaded
If the chainsaw stalls under load, the cause may be the fuel system or a dirty air filter.
Replacing fuel in the correct gas / 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 malfunction of the chainsaw, including in the case when it heats up and stalls.
Chainsaw stalls when tilted
When the chainsaw is horizontal, the fuel pipe lies at the bottom of the gas tank, when the tool is tilted, the pipe is above the fuel mixture, i.e. in midair. This is precisely the reason why the chainsaw stalls on its side.
Chainsaw stalls at high speeds
In the event that the tool stalls at high speeds, it is necessary to check three parts: an air filter, a fuel pump and a 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 fully, the gas filter may not be checked. If on the contrary, then the malfunction is 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 gas pump is checked for wear: if fuel does not leak through it, then everything is fine with it.
If the problem that your tool stalls at full speed is caused by some damage to the pump, then this part must simply be replaced with a new one.
The chainsaw stalls (does not start, turns off, does not gain momentum): causes and solutions
If the chainsaw starts up badly and stalls, there can be no question of the productivity of the simplest sawing operations. Not only budget class tools, but also quite prestigious models of leading manufacturers are subject to spontaneous failures.
The reason for stopping the chainsaw in the midst of work may be:
- poor quality of components and entire assemblies;
- unskilled care;
- the use of low-quality fuel and oil substitutes;
- illiterate exploitation.
Remoteness from service and the high cost of the repair services provided, forcing owners of failed tools to restore their performance on their own.
This option is possible only after the expiration of the warranty. The difficulty lies in the fact that the traces of the dismantling of individual components and assemblies noticed by service specialists can be the fault of refusing to repair more complex and expensive parts for free.
Self Repair Benefits
Experts offer several search options. the reasons for a poor start of the engine or if the power unit stalls during operation. The recommendations are equally valid for household and professional chainsaws.
Owners with experience in operating chainsaw equipment use simple, time-tested intuitive troubleshooting algorithms, which allows you 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 presence of locksmith and repair skills and operational experience. These same capabilities allow owners to use their chainsaw equipment with high efficiency.
Self-repair provides an opportunity to significantly save material resources and reduce the time of forced downtime.
Determining the nature of the malfunction
The main part of chainsaw failures of any class is fuel equipment. For the ignition system, this figure is an order of magnitude less. Chainsaw stop due to mechanical malfunctions in the practice of domestic and professional sawing is even less common.
Electrical equipment
Malfunctions of the ignition system are determined quite simply by checking the spark plug and adjusting the clearance in the contacts. After checking the integrity of the wiring, the reasons for the failure should be sought in the operation of the electronic unit.
The absence of a spark at the contacts may be due to the breakdown of the suppression resistor located in the casing of the cuff. To check its integrity, just connect the high-voltage wire to the candle directly.
Mechanical malfunctions
A sudden stop of the chainsaw can be caused by a jamming of the piston in the cylinder or destruction of the crankshaft bearing due to oil starvation or poor quality engine oil.
In the first case, the operability of the tool, you can restore the fill in the spark plug hole a few drops of engine oil. Repairing damage to the crank mechanism provides for complete disassembly in a well-equipped workshop.
Fuel Equipment Failure
A simple analysis of failures and malfunctions shows that most of them account for unskilled tuning of the fuel system. Upon closer examination, it turns out that the causes of the situation when the engine does not start, does not gain momentum and stalls almost the same.
In most cases, this is:
- air leaks due to loosening of screw fasteners or destruction of the crankshaft oil seal;
- nozzle contamination;
- leakage of the float valve;
- Booster pump seal wear.
Signs of characteristic failures
If the saw engine does not gain momentum and stalls, does not develop power and stalls under load, most likely there is a lack of fuel or incorrect carburetor adjustment.
The list of possible causes includes contamination of the fuel filter or air intake filter element, too rich or poor gasoline-air mixture.
Signs of engine operation on a rich mixture:
- slow set of revolutions;
- smoke from a silencer;
- decrease in traction characteristics and an excessive consumption of fuel.
The chainsaw stalls when you press the gas. most likely the mixture is too lean.
A simple way to determine the quality of a mixture
The easiest and most affordable way to check the quality of the mixture is the central spark plug insulator. The brown color of any intensity indicates the correct carburetor adjustment.
The result of working on a rich mixture is the formation of black soot at the insulator, the poor mixture manifests itself as a clean insulator of white or light gray color.
If, after a normal start-up and warm-up, the fuel-fed saw periodically stalls during operation, it is recommended to eliminate the vacuum in the gas tank by cleaning the breather. The cause of unstable operation of the engine may be condensate water trapped in the carburetor’s float chamber.
Engine shutdown in operating mode
In another embodiment, if the chainsaw heats up and stalls, the troubleshooting should be found 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 hot when a malfunctioning suppression resistance, which is located in the tip of the spark plug.
Engine stalls when idle
The malfunction is manifested by unstable operation in the operating mode and stalls at idle. The reason for this phenomenon is most likely due to air leakage between the carburetor and the cylinder suction pipe. Failure is eliminated by tightening the screw fasteners.
Chainsaw engine shuts off after reaching maximum speed
The power unit stalls at high speeds due to a mismatch with the stated requirements for the performance of the electronic unit. Failure is more characteristic of budget-made Chinese chainsaws.
The reason for the refusal may be:
- lack of fuel mixture in the float chamber due to valve sticking;
- clogged fuel filter or breather located in the fuel tank cap.
The power unit also stalls at high speeds due to a dirty air intake filter. The same symptoms are typical for a situation when the chainsaw in the standard mode started up and died out during the warm-up phase.
Fuel system setup
Qualified carburetor adjustment allows you to bring the power unit to a combination of maximum traction parameters and economical fuel consumption.
The success of the work is facilitated by preliminary cleaning of the air intake filter, warming up the engine to operating temperature, and performing the adjustment in the sequence specified by the instruction.
The result of proper carburetor tuning is:
- a quick set of revolutions without the “failure” characteristic of a poor mixture with a sharp gas supply;
- lack of increased smoke from the muffler;
- stable idle speed.
Non-standard failures
If a normally working chainsaw engine stalls when the tool is tilted to one side, open the gas tank cover and eliminate the freezing of the flexible fuel receiver.
Almost the entire range of Chinese chainsaws is more or less copied from popular models of European origin, so the structural differences are insignificant. The above recommendations can be used if the Chinese chainsaw fails.
The maintainability of Chinese chainsaw equipment has been enhanced through the unification of the repair stock and the interchangeability of many components and parts with the same model.