Patriot Chainsaw Starts And Stalls
The chainsaw starts and stalls Reasons why the chainsaw starts and stalls immediately, does not develop speed and does not give maximum power, and their elimination
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 required amount of fuel for its normal operation, and for this reason it will be unable to gain speed or stall. However, if you stop the tool, open and close the fuel filler 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.
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 unstable operation of the chainsaw.
- Impulse channel contamination. The impulse channel serves to ensure the operation of the fuel pump, respectively, its contamination leads to improper operation of the pump, which will make it impossible for the saw to work (it will start and immediately stall).
- CPG wear. As a rule, with increased wear of the CPG, there is a decrease in compression in the engine of the chainsaw, which will necessarily affect its ability to develop speed.
- Dirty fuel and air filters.
Algorithm for checking the crankcase for leaks
- Remove the side cover and bar from the chainsaw.
- Unscrew the spark plug and lay the 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 an old cord from the starter, tying knots on it every 3-5 cm.
- Unscrew 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 the 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.
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. We will try to figure out why the chainsaw stalls under various operating modes, as well as describe how you can diagnose a malfunction, in our article.
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 swim. 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 failed and the crankcase with the carburetor is sealed, you can proceed to adjust 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 operate 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. In it step by step the process of disassembling the saw is filmed, the impulse hose is shown and the consequences of its malfunctioning HUSQVARNA 142 are discussed.
Why does the chainsaw start and immediately stall
The chainsaw starts up and immediately stalls, the reason for this behavior may be hidden in the carburetor. A malfunctioning fuel pump or malfunctioning of the main fuel jet can cause this saw to behave. The inability to operate the chainsaw after starting requires a full diagnosis at the service center.
All of the above options for engine malfunction have similar causes, which, depending on their neglect, can have different manifestations. For example, with a slight intake of air into the crankcase of the engine, its 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. A strong air leak 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, melting of the piston, jamming of the crankshaft.
Chainsaw stalls under load
If the chainsaw stalls under load, this may be due to the fuel system or a dirty air filter. Replacing the fuel with the correct gasoline / oil ratio or cleaning the air filter are all universal solutions. An improperly prepared mixture of low-quality gasoline and, for example, machine oil is the main reason for the malfunctioning of a chainsaw, including when it heats up and stalls.
The chainsaw starts and stalls. Why?
There are several simple rules for the operation and maintenance of a chainsaw, the observance of which will maximize its service life. Preparing the correct fuel mixture, regularly cleaning filters and periodically replacing parts will save you from having to repair your tool for a long time. If it was not possible to avoid the breakdown, then you can figure out its cause completely independently. This applies to all brands of chainsaws, from the more complex Husqvarna and Stihl models to the simplest Makita and Patriot models.
The chainsaw stalls immediately
What to do if the chainsaw stalls immediately after starting? First you need to check the presence of fuel in the gas tank. If its level is not enough, then you need to prepare the fuel mixture in strict accordance with the ratio of gasoline and oil prescribed in the operating instructions. Gasoline must have the highest possible octane number, and the required brand of oil, as a rule, is indicated in the data sheet of the chainsaw.
Next, we check the spark plug, as well as the contact of its tip with the high-voltage wire. The gap between them should be no more than 0.5 mm. If necessary, the candle is cleaned of carbon deposits and dried. It is recommended to occasionally change the candle to a completely new one. The reasons for the tool stalling when you press the gas lie in the fuel filter or carburetor jet. Cleaning the gas filter will not take much time and effort, but it is better to entrust the disassembly and cleaning of the carburetor to the specialists of the service center.
Chainsaw stalls when tilted
When the chainsaw is horizontal, the fuel pipe lies at the bottom of the gas tank, but when the tool is tilted, the pipe is above the fuel mixture, i.E. In the air. This is what causes the chainsaw to stall on its side.
Chainsaw stalls at idle speed
Cases are common when the chainsaw stalls at idle. First of all, you need to check the muffler, and, in case of contamination, clean it from exhaust tar deposits. Also on the carburetors of some models, etc., there are bolts with the inscriptions H and L, respectively, rough and fine tuning. By adjusting the bolt L during the operation of the chainsaw in such a way that its speed increases (turn the bolt only half a turn), it is possible to eliminate this problem. Adjusting the carburetor requires an electronic tachometer and is a rather time consuming process. That is why, in such cases, it is better to turn to professionals.
The chainsaw stalls at high speeds
In the event that the tool stalls at high rpm, there are three parts to check: the air filter, the fuel pump and the gasoline filter. The air filter must be cleaned, you can even wash it under water and dry it thoroughly. Then it is enough to disconnect the fuel hose from the carburetor and see if fuel flows out of it or not. If it flows with a full stream, the petrol filter need not be checked. If, on the contrary, the fault has been found. The breather can be cleaned with a regular needle, and the filter can be carefully disconnected from the suction hose, cleaned or replaced with a new one. The gas pump is checked for wear: if the fuel does not seep through it, then everything is fine with it. If the problem that your tool stalls at full speed is due to some damage to the pump, then this part just needs to be replaced with a new one.
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Checking the outlet of the chainsaw.
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 arrester;
- Disassemble the resonator housing;
- Wash all elements from carbon deposits with detergent;
- Let them dry completely;
- Collect everything in reverse order;
Finding reasons why your chainsaw won’t start
Amateur and professional chainsaws are complex devices. The service life of their two-stroke engines, components and assemblies has its 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.
- Identification and elimination of obvious malfunctions of the chainsaw.
- Checking the spark on the spark plug and eliminating the cause.
- We determine the availability of fuel and its supply.
- Checking the condition of the fuel and air filters.
- Checking the breather and cleaning it.
- Checking the outlet of the chainsaw.
- What if the chainsaw won’t start further?
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 prevents gasoline from flowing 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, preventing 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 out without hindrance 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.
Checking the spark on the spark plug and eliminating the cause.
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 the chainsaw engine starts, 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.
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 candle 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 2030 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.
If there is no spark with poor contact of the high-voltage cradle with the spark plug tip, check the connection. The check can be done using a conventional tester. If a defect is found and its elimination, the chainsaw should start without any problems.
If the check showed that the contact is reliable, and the saw will not start further, look for the cause in the ignition unit. As a rule, a faulty unit cannot be repaired or restored. It will require a complete replacement.
We 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. Disconnect the fuel system pipe from the carburetor and try to pump it up. In the case of a complete order, when pumping, gasoline will be supplied in jerks in accordance with the standards set by the manufacturer. Poor or no fuel supply can result from:
- The fuel supply channel is clogged;
- 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, filled up to 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 gum formation and polymerization of 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.
Identification and elimination of obvious malfunctions of the chainsaw.
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;
- Functioning of the outlet channel.
To the content
The main causes of chainsaw breakdown
Although the chainsaw is a simple device, from time to time, problems occur in its operation, which can only be fixed by disassembly. The following malfunctions can be cited as examples:
- The chainsaw is not picking up speed;
- The chainsaw stops functioning in the cut;
- The chainsaw starts and stalls;
- The chainsaw loses its power;
- The chainsaw stalls when pressed.
Most often, malfunctions are associated with interruptions in the functioning of the motor, as well as with malfunctions of other systems and components. Proper handling of this technique is essential. When all the rules of use are followed, problems with a high probability lie in the most obvious. When looking for the causes of problems, it is advisable to start by checking the simplest part of the chainsaw and end up with the most difficult.
What to do if the chainsaw stalls when you press the gas
One of the most common questions regarding the operation of this device: why the chainsaw stalls when you press the gas and what should be done to solve this problem? In such a situation, you must perform the following actions:
- Check the fuel filter;
- Inspect the fuel hoses for leaks;
- Check the muffler;
- Try to increase the speed a little;
- Check the condition of the rubber seals on the crankshaft.
Checking the main systems of the chainsaw
If the chainsaw refuses to work properly, you need to make sure that all the conditions required for its normal operation are provided:
Then it is necessary to sequentially check the functioning of all its elements. First you need to check the fuel tank. If the cause is not volume and quality of fuel, then spark plugs may be the likely cause of the problem. The gap at the candle should not exceed 0.5 millimeters. If it is too small, it means that carbon deposits have been deposited on the candles. In this case, remove the candles, clean them, then reinstall and try to start the chainsaw. In addition, it is advisable to completely replace the candles with new ones from time to time, 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 it is best to entrust the repair of the carburetor to specialists.
Why does a chainsaw stall under load
Sometimes the saw will not function properly under load. This is most often caused by improper adjustment or leaking carburetor. In addition, air leaks through the carburetor gasket or crankshaft oil seals may be the cause of this problem. A tool that is unable to function under load also cannot maintain idle speed with confidence.
Diagnostics begins with checking the carburetor and crankcase for leaks. If air leaks through the crankshaft oil seals, they must be replaced. If air leaks in the carburetor are detected, a repair kit for gaskets is required to solve the problem.
If these actions did not lead to the desired result and the crankcase with the carburetor is sealed, then the carburetor needs to be adjusted.
If a Husqvarna chainsaw stalls under load, then for any deviations in the functioning of the engine, you should first of all check the impulse hose, since this is the most common cause of breakdowns of this brand of chainsaws.
Why the chainsaw doesn’t pick up speed and stalls
If the saw cannot gain speed or stalls when you press the gas, then most likely this is caused not by the tightness of the carburetor or motor crankcase. This problem is eliminated by checking for leaks and adjusting the carburetor.
In addition, this malfunction may be associated with a defect in the fuel tank breather. Due to the formation of a vacuum in the fuel tank during the operation of the chain saw, the required volume of the fuel mixture does not enter the engine, as a result of which it cannot gain speed or stalls. If you stop the chain saw, open and close the fuel tank, and turn it back on, it will run normally for about five minutes, and then it will stop picking up speed again or stall.
Another possible reason for the chain saw not being able to pick up speed may be excess carbon deposits in the muffler, which makes it difficult for the exhaust gases to escape, which reduces the power and engine speed.
Why the chainsaw stalls, the main reasons.
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 which case it is necessary to completely replace it.
- Clogged breather, 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 degradation 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 increasing revs.
- Chain shortage due to lack or insufficient lubrication, or a problem with the chain brake.
Why the chainsaw does not start well and stalls
With a poor start of the equipment to a cold, the problem may be the lack of compression, i.E. 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 flow of air, leading to an increase in saw speed.
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
- The engine starts and stalls
- Unstable tool performance
- Work 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
- Carburetor clogged
- High voltage wire problems
- Lack of compression.
Why does the chainsaw start and stall, what to do in this case? The reasons for this need to be examined in detail.
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 preventive maintenance, when the chainsaw is idle, 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 they are well connected, the ignition unit must be replaced.
A clogged muffler is a common cause of breakdown, in which a 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 out.
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 setting it up, just 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, it is necessary to replace the fuel pump or clean the air filter.
If the breather is clogged, clean it 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 tube for breaks or blockages.
When inspecting the piston group, you should 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 control 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.