A chainsaw is a relatively simple device, which is used from time to time by summer residents, installers, builders and rescuers. Construction stores offer a lot of models of chainsaws, which vary in power and quality of work. However, this practical and unique technique can also fail.
If such a problem occurs, it is very important to find the cause of the malfunction and eliminate it as quickly as possible. To do this, it is not necessary to contact services where the equipment will be put in order for a fee. Sometimes the breakdown can be so minor that it is not difficult to deal with it yourself.
How does the tool factory work?
Chainsaw equipped carburetor two-stroke engine, which is practically its main element. Its power depends on the model of the equipment and its intended purpose.
The chainsaw saw set includes:
- cutting chain;
- sprocket;
- stars;
- tires.
The larger the pitch the headset has, the more powerful and productive it will be, and therefore the cut will be deeper. Therefore, the engine should not be inferior to it in terms of power, otherwise the operation of the tool will be inferior.
The chainsaw is lubricated with special oil directly from the second tank located on the hand block. Its mass has such features that the fuel and oil intended for the engine run out at the same time.
We have become familiar with the basic elements of the tool; now it will be easier to understand the reasons why a chainsaw may stop working and how to eliminate them.
Causes of malfunctions and ways to eliminate them
Almost every chainsaw owner has at least once encountered the fact that the tool either does not start at all when you press the gas, or starts and stalls after a while. There can be many reasons for a device to malfunction. Some of them are quite simple and easily eliminated. Therefore, it is worth studying the main reasons so that in the event of a basic breakdown, you do not take the tool to a chainsaw repair service.
Why does a chainsaw start and immediately stall?
There may be several reasons for this:
- There is not enough fuel in the gas tank. If the tool stops working immediately after the factory, then first of all you need to check the presence of fuel in the gas tank. If it is not enough, then you need to add the fuel mixture, which is prepared strictly according to the instructions included with the tool. Chainsaw fuel consists of gasoline with the highest possible octane number and oil, the brand of which must be specified in the technical passport of the tool.
- Poor contact between spark plugs and high-voltage wire. The gap between the spark plug tip and the wire should be no more than 0.5 mm. If carbon deposits have formed on the candle, it must be cleaned and dried. Experts recommend periodically updating spark plugs, even if the old ones are still working properly.
- Pouring a candle. A large amount of fuel collects between the spark plug electrodes, so if the spark plug is flooded, a spark will not form. To fix such a breakdown, just remove the spark plug and dry it. It would be useful to heat it using a gas burner.
- Carburetor jet or fuel filter is dirty. It is quite easy to clean the gas filter yourself, but it is better to entrust cleaning the carburetor to specialists.
The chainsaw malfunctions at idle speed
The cause of this malfunction may be dirty muffler. Therefore, in order for the tool to work properly, sometimes you just need to clean the muffler of exhaust tar deposits.
Quite often, the air filter in the tool becomes clogged, the air flow into the system becomes clogged, and this leads to the device stalling at idle.
To clean the air filter, it must be carefully pulled out, making sure that dust from it does not fall on the carburetor. Next, the filter is thoroughly washed with detergents, dried and replaced.
The chainsaw may stop idling due to fuel filter problems. To check it, you need to disconnect the fuel line from the carburetor. If, when pumping, fuel hardly flows out of the hose and flows poorly to the carburetor, then most likely the filter is clogged with debris.
To clean it, you must first drain all the fuel and then remove the filter from the tank. This is done using a wire hook through the filler head of the tank. The filter is then disconnected from the hose and cleaned.
For normal operation of the chainsaw, it is recommended to change the air and fuel filters every three months.
A chainsaw may stall at idle when it has fuel line is damaged. Therefore, each time before starting work, it is recommended to inspect the mechanism, its components and blocks for possible mechanical damage to the housing and fuel drive, and liquid leaks.
If the instrument was stored in a damp place for a long time or was exposed to temperature changes, the tube could simply crack. In this case, it must be replaced with a new one.
If the chainsaw does not want to idle, then the reason for this may be non-compliance with the ratio of gasoline and oil when preparing the fuel mixture. The proportions must strictly comply with the instructions supplied with the chainsaw. If they are not followed, the engine will not be sufficiently lubricated, as a result of which the mechanism will begin to stall.
The chainsaw does not work at high speeds
At high speeds, the tool may begin to stall due to malfunctions:
- gasoline pump;
- fuel filter;
- air filter.
To trust a gasoline pump, you need to see whether fuel is leaking through it or not. If it is damaged, then most likely the chainsaw will stall at full speed because of this, and the pump needs to be replaced with a new one.
To check fuel filter, just disconnect the hose from the carburetor and see whether gasoline flows out of it or not. If it flows in full stream, then everything is fine. Otherwise, the fuel filter must be cleaned or replaced with a new one.
To clean the air filter, you simply need to wash it under running water and then dry it thoroughly.
The tool motor cannot withstand the loads
If the chainsaw often stalls when cutting thick logs, then problems should be looked for in the air filters or fuel supply system.
When working under heavy load, the engine may simply not receive enough fuel and stop. Therefore, this problem can be eliminated by cleaning the air filter or replacing the fuel, which must be prepared strictly according to the recommendations of the instructions.
The new chainsaw does not want to work
In principle, there shouldn’t be any problems with the new tool, but if it still doesn’t start, then most likely it’s manufacturing defects or all instructions in the instructions are not followed.
To fix this problem, you should first look to see if everything is screwed and connected, as required by the instructions.
The cause of the malfunction may also be an incorrectly prepared fuel mixture. The performance of a chainsaw can be affected by poor quality ingredients used to make the fuel. It is best to choose tool oil from a well-known manufacturer, so that problems do not arise later during operation.
If everything was done strictly according to the instructions, but the chainsaw still does not work, then you will have to contact a service workshop.
Failures of the cylinder-piston group
If all the above-described malfunctions are eliminated, and the chainsaw still stalls when you press the gas, then the cause will need to be looked for in the engine, or more precisely, in its cylinder.
Sometimes the performance of a cylinder-piston group can be determined simply visually. It will not be possible to start the saw if there are scuffs, chips and other defects. In this case, the parts must be replaced.
When you press the gas, the tool may not start or even stop working if the piston rings are damaged. Therefore, if there are no other obvious reasons, it is necessary to investigate the rings, damage to which leads to loss of engine power. The fact that it is time to change the rings is indicated by their free play in the cylinder grooves.
However, in order to fully understand the technical condition of the cylinder-piston group, the engine should be completely disassembled. This work is labor-intensive and only a specialist can do it.
Undoubtedly, equipment failure can upset its owner. But you shouldn’t despair ahead of time, because some breakdowns can be fixed on your own. If the chainsaw does not start when you press the gas, this does not mean that you immediately need to take it to the workshop. In some cases, it will be enough to simply follow the advice of specialists described in this article.
Why does a chainsaw go silent under load?
Running chainsaws and kiosks, reason
A chainsaw is no longer a luxury, but a necessary tool for those who have at least some kind of suburban area. With it you can do gardening, collect firewood, process lumber and much more. There are a lot of chainsaw models on sale, differing in both performance and overall workmanship. You can check it out here. e-catalog.ru.
However, any method can be fancy, and chainsaws are no exception. Let's look at the most common problems.
The tool stops straightaway after the start
Chainsaws with increased speed
The reasons for this are similar to the previous ones: either the problem is in the fuel system or in the air filter. Try to disconnect the fuel hose from the carburetor. if gasoline flows poorly (but you know for sure that there is fuel in the tank), the reason is in the gasoline filter. At the same time, you can also check the fuel pump. fuel should not flow through it. If this happens, the pump should be replaced.
Why does the chainsaw die?
There are several reasons why a chainsaw is dull. And, as a rule, almost all of them can be resolved independently, without going to a service center.
Check the filters: fuel and air. If they are clogged, then, of course, this is the reason the tool does not work properly. And dirt is not always visible to the naked eye. Therefore, even if everything seems to be in order, it is better to carry out this procedure.
The second reason, perhaps, is the candle. Remember the last time you changed it? According to the rules for operating a chainsaw, this should be done once a year.
If this does not help, then you should try to adjust the carburetor. Probably due to vibrations when working with the chainsaw, its factory settings were lost.
If the saw stops after long-term storage, for example in an unheated garage, then it is worth looking at the fuel line. This is usually a rubber tube that can become cracked and wet from humidity and cold temperatures and cause the chainsaw to malfunction.
If none of the above helped, then most likely the breakdown is more serious and, unfortunately, you will have to contact a workshop.
What if the chainsaw is dead?
- Problems associated with improper operation of the fuel system
- Problems at idle due to a faulty muffler
- Malfunctions of the cylinder-piston group
Builders, installers, rescuers and gardeners #8211 all of them, sooner or later, carry out their tasks, take a chainsaw. And the final result of their activities largely depends on how reliably this tool will work.
A chainsaw is used to cut wood.
It should be noted that a chainsaw is a relatively simple device. However, like other mechanisms, it breaks down periodically. When a chainsaw goes out when idling (this is one of the most common malfunctions), the biggest problem is to determine the reasons for this behavior of the device. If the source of the "disease" is correctly identified, it will not be too difficult to return the device to its working position.
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Therefore, the first thing to do is to find out what malfunctions the chainsaw has and what causes the engine to stop idling.
The car stops idling: possible reasons
To answer the question of why the saw, periodically capricious, stops at idle, you should keep in mind that this tool is based on a conventional two-stroke internal combustion engine.
It follows that various problems with the main components of any ICE lead to failures: fuel and lubricants, ignition system, quality of the air-fuel mixture and compression within the cylinder.
The main engine malfunctions are as follows:
- the engine does not start
- It starts, but, working uncertainly, quickly stops at Idling
- The chainsaw runs fine at idle, but stops under load.
The reasons for idle speed problems can be different. But they can all be reduced to several general positions. Thus, problems such as:
Internal chainsaw.
Possible clogging of the fuel and air filter
Chainsaw repair PARTNER. Starts up, but immediately stalls.
Repair chainsaw PARTNER. Starts, but immediately stalls. Repair chainsaws PARTNER, you can do it yourself.
Chainsaw starts and stalls
Chainsaw does not work stalls. Don't nag, I'm tired of it. As much as you can about the secret, here it is.
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Problems with fuel and air filters and their elimination
The chainsaw will stall at idle if the fuel or air filter becomes clogged. To find out the condition of the first element of the fuel system, you need to disconnect the gasoline line from the carburetor. If the fuel is supplied in doses that meet the specified standards, the cause of the malfunction should be looked for elsewhere. If gasoline enters the carburetor slightly or does not flow out of the hose, the filter is most likely clogged with debris.
To clean, remove it from the tank (out of the tank until this point is completely discharged). Extraction is carried out through the filling neck of the tank using a wire hook. The filter is disconnected from the suction hose. If possible, the filter is cleaned. If this is not possible or there is no practical solution for a number of reasons, the used filter is changed to a new one.
The chainsaw may stall if the fuel filter becomes clogged.
The air filter can also become clogged with dirt or dust, causing rough idling. It should be remembered that this filter becomes clogged quite often, resulting in obstructed air flow into the system. The proportion of gasoline in the fuel-air mixture increases, and it becomes excessively enriched. In this case, normal engine operation cannot be expected.
To clean the air filter, remove it with extreme care so as not to vacuum the carburetor. It is then cleaned and washed thoroughly. Detergent is added to the rinse water. After drying, the air filter returns to its place in the chainsaw.
For normal operation of the cutting tool, it is recommended to change the fuel and air filters every 3 months.
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Spark plug problems and how to fix them
It is generally recommended that this key component of the ignition system be replaced at least once a year. But saw owners often forget about this rule. And therefore, do not be surprised that a device whose maintenance is carried out fragmentarily, as a result, does not “hold” downtime well.
The chainsaw's spark plug should be changed once a year.
Therefore, it is necessary to pay attention to the following errors associated with the operation of this system:
- Filling the spark plug with gasoline at startup. To fix the problem, they get a candle and, without calcining, dry it. Excess fuel flows out of the engine through the hole into which the spark plug is screwed. After a break of 30 minutes, the candle is inserted into place, the mechanism starts.
- Lack of spark due to poor contact of the spark plug tip with the high-voltage wire. The connection is checked, if the defect is broken, the defect is eliminated.
- No spark due to faulty ignition electronics. If you are confident that the tip is connected to the high-voltage wire, but sparks still do not occur when the starter is turned on, the cause of the failure may be a malfunction of the ignition unit. This component is not restored, it is only changed to a new one.
- Incorrect gap between spark plug electrodes. In different types of candles this figure ranges from 0.2 to 0.5 mm. The correct clearance is established using a suitable pressure gauge. More or less ground clearance for this type of spark plug is not allowed.
Meanwhile, during the initial inspection of the spark plug, you can find out that the cause of the failure of the chainsaw is not due to defects in the spark plug or other elements of the ignition system.
The spark plugs can tell you if your saw is faulty.
So, if the plug appears to be completely dry, this may mean that the original problem is the inability of fuel to enter the combustion chamber. In this case, you must check the entire gasoline supply chain from the carburetor itself.
However, the presence of #8211 charcoal on the spark plug body is a sign that the carburetor may be poorly adjusted. Because of this, the fuel mixture is oversaturated with gasoline. Perhaps oil got into the fuel. In this case, you must clean the spark plug, change the fuel and adjust the carburetor.
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Custom carburetor work
If this is discovered experimentally: the filters are clean, and the ignition system is not to blame for the fact that the chainsaw cannot operate at idle, the owner of the tool is recommended to switch his attention to the carburetor.
How to sharpen a chainsaw chain with your own hands: the main rules of operation and the necessary equipment Any devices used in everyday life, be it household appliances or garden equipment, require constant and competent maintenance. Timely repairs can extend their service life and also increase the level of efficiency...Disassemble and reassemble the carburetor without haste, as it has many parts without which it cannot work.
Often, erratic operation results in misalignment of this device, which is responsible for delivering a certain volume of air-fuel mixture to the engine cylinder. Adjust it with three special screws located on the carburetor: the maximum and minimum speed screws, as well as the screw that controls the idle speed.
Some manufacturers, fearing unwanted interference from incompetent people, supply their products with only one screw during the unoccupied year. But in both cases, carburetor adjustment can only be made if all the manufacturer's instructions are strictly followed.
However, even after adjusting the carburetor in accordance with factory rules, this device may jam. Then it is recommended to clean the fuel and air channels, jets, and filter element mesh. If the membrane is damaged, it must be replaced with a new and high quality one.
When taking care of maintenance, we must always remember that it usually contains a lot of small parts, without which the device simply cannot work properly. Therefore, disassembling and assembling the carburetor should be done without haste and with extreme caution.
A chainsaw is no longer a luxury, but a necessary tool for anyone who has at least some kind of suburban area. With its help you can carry out gardening work, collecting firewood, processing lumber and much more. There are many models of chainsaws on sale, varying both in power and overall quality. You can verify this here - e-katalog.ru.
However, any technique can be capricious, and chainsaws are no exception. Let's look at the most common problems.
The tool stalls immediately after starting
One possible reason is a lack of fuel. Check the amount of fuel in the gas tank and add if necessary. In this case, you should strictly follow the recommendations of the instructions, especially regarding the quality of gasoline and oil. In our country, such subtleties are often ignored, filling the saw with whatever is necessary, which causes accelerated wear of the engine and leads to failures.
The saw may also stall due to deterioration in the contact of the spark plug with the high-voltage wire. This may be caused by mechanical shear or carbon deposits. Sometimes it is recommended to periodically replace the spark plug with a new one, even if the old one did not show any problems in operation.
The chainsaw can work normally when in a straight horizontal position, but stalls when tilted to the side. As a rule, this is also due to a lack of fuel: the fuel tube rises when tilted, and if there is little fuel, it rises above the fuel level.
Chainsaw stops idling
If cleaning the muffler did not help solve the problem, and your saw’s engine is carburetor, then you can try adjusting it. Most engine models have coarse and fine adjustment bolts (H and L, respectively). By increasing the engine speed with their help, you can eliminate the problem. Keep in mind that carburetor adjustment is a fairly delicate process that requires the use of a tachometer.
The engine cannot withstand the load
If the chainsaw stops right in the middle of a particularly thick log, then the problem may be caused by problems with the fuel supply system or problems with the air filter. The engine simply does not receive enough combustible mixture to operate under heavy load, and stops.
The usual solutions to these problems are replacing the fuel in strict accordance with the recommendations in the instructions (we have already talked about this) and cleaning (replacing) the air filter.
The chainsaw stalls when the speed increases
The reasons for this phenomenon are similar to the previous ones: either the problem is in the fuel system or in the air filter. Try disconnecting the fuel hose from the carburetor - if gasoline flows poorly (but you know for sure that there is fuel in the tank), then the reason is the gasoline filter. You can also check the fuel pump - fuel should not leak through it. If this happens, then it is advisable to replace the pump.
There are situations when even the newest chainsaw stalls at idle. This situation is associated with the factory carburetor settings or lack thereof. It happens that during long-term transportation, the carb of the tool also becomes out of adjustment, because improper maintenance conditions are enough for this to happen. The chainsaw stalls at idle and due to a malfunction of the fuel pump. Why this happens - you need to understand the crankshaft seals and pan gaskets, as well as other components of the fuel supply system. In this article we are interested in each possible cause and the stages of its resolution. , how to repair it correctly and quickly, the specialists of the KosiKosa store will always help you.
It is important for owners of gas powered tools to understand that the saw can stall not only at idle and not pick up speed, but also at maximum and minimum speed. All these situations are interconnected, and the reasons for their elimination are also of a similar nature.
Does your chainsaw stall at idle? There is an exit
If the saw starts to stall at idle, then there are a priori several reasons, and it will be easy to find out even for a novice owner if you follow the recommendations of our specialists and check everything competently and delicately. So, the reasons why chainsaw stalls at idle may be the following:
- reduction in the capacity of gasoline and air filters;
- malfunctions in the ignition system, also referred to as its abnormal operation;
- spontaneous change in carb settings;
- elements of the fuel supply system are faulty;
- the muffler or exhaust ducts are clogged;
- the occurrence of defects on the piston, cylinder or other elements of the CPG, defects on the valve;
Before checking the insides of the saw to find out why the tool stalls at idle, you need to inspect all its external components for any deviations, which may include possible deformations, and also check for the presence of fuel in the tank. Let's consider each of these situations:
- We check and repair filters. If the fuel or air filter is clogged, the engine receives insufficient amounts of air or fuel, or does not receive one of the elements at all, and accordingly cannot operate fully. We remove the fuel line hose from the carb fitting and direct it into a working container. Click on “paging” several times and look at the result. With a clean fuel filter, gasoline flows evenly, clearly, without jerks and vice versa. To check the air filter, you need to remove it carefully so that sawdust and dirt do not get into the carb. After washing it, blowing it or replacing it with a new one, we analyze the result to see whether the problem was in two or one of the filters.
- We check the ignition system and the spark plug itself. Its poor condition can cause the saw to fail to operate at idle speed, if it stalls when you give it gas or even fails to start at all. So, the candle could have been filled with fuel; a spark does not occur due to a huge amount of carbon deposits or a burnt-out spark plug element; a spark does not occur if the gap between the electrodes is violated (too large or small); a dry spark plug will indicate a lack of gasoline in the piston cylinder; Incorrect carburetor adjustment and a clogged air filter can be determined by the presence of black carbon deposits on the spark plug and soot on its electrodes.
- Why, after checking the ignition system and filters, the saw continues to stall at idle - the cause can only be the carburetor. You need to find three adjustment screws, among which one is responsible for maximum speed, the second for minimum speed and idle speed (the screw is called “T”). It must be configured according to the recommendations, strictly according to the instructions for each individual device. If even adjusting the idle speed did not help, and the saw continues to stall at the same speed, proceed to disassembling and inspecting the whole crab. We describe how to do this in our articles.
- Malfunctions, breakdowns, clogging of the chainsaw muffler. The last option, which provokes situations at idle when the saw stalls. A muffler contaminated with sawdust and dirt, with adhering oils and exhaust gases, loses its throughput. If it is not cleaned and replaced in time, the engine will begin to “choke.” All elements associated with the muffler must be gently soaked, carefully cleaned and blown with compressed air, and installed in their place. At this moment, cover the engine with a rag to prevent dust from entering.
If your Husqvarna saw or Shtil power tool stalls at idle speed, we have presented you with all the existing testing options. It is also important to correctly assemble all the parts during disassembly in their original place, drain the gasoline, if any, replace it with a clean mixture and try to start the saw. You can always order on the KosiKosa service.
If you already understand the reason why your saw stalls at idle, but don’t yet know how to approach disassembling or removing a separate part, say, a carburetor - watch the video from other articles from our specialists, read the step-by-step instructions in the articles. We also recommend that you treat all moving elements with extreme caution to avoid injury. Other important recommendations include:
Prices for chainsaws are falling and this makes them more popular and affordable not only for professionals, but also for ordinary, so to speak, amateurs. However, a common dependence - the lower the price, the less reliable the device and the more often malfunctions appear, is also relevant for chainsaws. But for a chainsaw of any price range, most malfunctions can be avoided with proper operation, care and timely maintenance of the equipment. But no one is immune from the breakdown of a chainsaw, as well as any other equipment. It is therefore proposed to consider main types of chainsaw malfunctions, methods for diagnosing, eliminating and repairing them.
All the main malfunctions of chainsaws can be divided into two main categories:
- malfunctions of the engine and its various components: fuel preparation and supply system, ignition, piston group with crankshaft, exhaust gas exhaust system;
- malfunctions and breakdowns of other components: lubrication system, clutch, chain brake, tire and others.
Chainsaw engine malfunctions
Here are various malfunctions in the operation of a chainsaw engine that occur most often. These main malfunctions boil down to the following symptoms:
the engine does not start (quite general and the reasons can be quite different);
works unsteadily;
starts, but often stalls;
overheats quickly;
does not develop power, i.e. It runs fine at idle, but stalls or "chokes" under load.
It smokes a lot and the power drops.
Problems starting the engine
It is very important to correctly determine the cause of the malfunction, because otherwise we simply cannot eliminate it. If, when trying to start the chainsaw, there are no extraneous sounds (knocking, grinding, etc.), then very often it turns out that in fact there is no breakdown. For example, if you start the chainsaw incorrectly and pull the choke for a long time, the engine simply floods and it is very difficult to start it.
In order to properly start a cold chainsaw engine, set the lever or switch to the “throttle closed” position. Then you need to pump the mixture into the carburetor, if there is a fuel priming pump. Pull out the starting handle until the engine resistance becomes noticeable, and vigorously pull in amplitude, moving your hand to the side. After two or three such movements, the engine should first start and then stall. If this does not happen, then you need to move the lever to the half-throttle position or simply to the working position and then continue to start the chainsaw in this mode. For many chainsaws, the “half throttle” is automatically locked when the air damper is pulled out. Some models have a key ignition switch; it is important to make sure it is turned on.
If the engine does not start, then the first thing to do is unscrew and inspect the spark plug. There are cases when at a plant in the cold season, the combustion chamber is filled with fuel. Then you also need to unscrew the spark plug, dry the combustion chamber by idling, clean the spark plug, screw it in and repeat the start. It is advisable to immediately check for the presence of a spark - put a cap with a high-voltage wire on the unscrewed spark plug, place it on the cylinder and pull the starter. Visually we observe a frequent blue spark - good. Screw the spark plug into place and start it. If there is no spark, change the spark plug and try again. No again - we check the connection of the high-voltage wire to the spark plug, the coil and the ignition system.
In general, the type of malfunction can be judged by the condition of the spark plug.
- Dry. Most likely, the fuel mixture is not getting into the cylinder. The problem is not in the ignition system, so screw the spark plug back in and check the fuel supply system.
- Wet, heavily splashed with fuel. The reason for the excess fuel mixture lies either in a violation of the starting rules, as described above, or in incorrect carburetor adjustment.
- Covered with black soot. This may indicate the use of low-quality oil, an incorrectly adjusted carburetor, or an incorrectly calculated ratio of gasoline to oil. The spark plug should be washed, removed from carbon deposits with a sharp object (an awl or a needle), the electrodes should be wiped with sandpaper and placed in place.
When checking the spark plug, you need to pay attention to the gap between the electrodes: 0.5 to 0.65 mm is considered normal. A damaged or worn gasket must be replaced.
Checking and adjusting the chainsaw carburetor
A properly adjusted chainsaw carburetor ensures that it operates efficiently at full power with the most economical fuel consumption.
The need to adjust the carburetor of a chainsaw rarely arises, since the adjustment is initially carried out by the manufacturer to achieve optimal operating mode. The adjusting screws are designed for more precise adjustment of the chainsaw carburetor if necessary.
When and why does this need arise?
Among the reasons for the failure of fixation of the adjusting screws, the most common are the following:
- Severe vibration or damage to the protective cap. This happens rarely, but it does happen.
- Serious engine wear (piston). Of course, in this case it is worth taking more care of repairing the chainsaw engine, but still adjusting the carburetor can improve its functionality for a while.
- Blockage in the carburetor due to damage to the air filter, poor quality gasoline or due to the formation of scale. In this case, in addition to adjusting the carburetor, flushing it cannot be avoided.
What signs indicate the need to adjust a chainsaw carburetor?
- Firstly, the engine does not start, or it starts, but immediately stalls. This most often occurs due to a lean fuel mixture.
- Secondly, a significant increase in fuel consumption and exhaust emissions. An increase in exhaust emissions indicates that the fuel does not burn completely, which means that the cause may be oversaturation of the fuel mixture.
The scheme for adjusting the carburetor of a chainsaw may differ slightly depending on the manufacturer (the process of adjusting the carburetor of a chainsaw of a specific brand and model is described in detail in the operating instructions), but the general principles remain the same for all brands. The purpose of adjusting the saw is to change the quantity and quality (richness) of the fuel mixture supplied to the engine cylinder.
To learn how to adjust the carburetor on a chainsaw, you should learn to distinguish between three screws (some models have only one).
Screws L and H are similar only in appearance, in fact they are different
Each screw has its own letter designation:
- “L” is used to adjust low speed;
- “H” is necessary to adjust the upper speed;
- “T” is needed to adjust the idle speed (models with one screw only have it).
There are mandatory safety requirements that must be observed when adjusting the carburetor of any chainsaw:
- Make sure the chain is facing away from you.
- The saw must be firmly positioned on a level surface, and its cutting part must not touch any objects.
Please note: you will find the exact values of the angle of rotation of the adjusting screws in the operating instructions for your specific chainsaw model. Carefully following the manufacturer's instructions will help you avoid engine damage.
The process of setting up a chainsaw carburetor consists of two stages: basic (engine off) and final (warm engine running).
Basic adjustment of a chainsaw carburetor
Slowly turn the maximum and minimum speed adjustment screws (H and L) clockwise until they stop, then turn them counterclockwise 1.5 turns.
Final adjustment of the chainsaw carburetor
Idle speed adjustment
Before this adjustment step, it is necessary to warm up the engine for 5-10 minutes, avoiding high speeds.
By turning the idle speed adjustment screw (T/LA/S) counterclockwise, achieve the minimum speed at which stable engine operation will be ensured. Make sure the chain does not move. That is, if the engine stops at idle, turn the idle speed adjustment screw clockwise. If the chain is driven, turn the screw counterclockwise.
To complete the adjustment of the chainsaw carburetor, you need to check the engine for acceleration and maximum speed.
Acceleration check
To check the engine for acceleration, gently press the accelerator and make sure that the engine quickly picks up speed from idle to maximum speed (from 2800 to 11500-15000 revolutions - depending on the brand and model of the saw). If the engine picks up speed slowly, slowly turn screw L counterclockwise (no more than 1/8 turn).
Adjusting the maximum speed
The maximum speed is adjusted using screw H. The speed increases when it is turned clockwise, and decreases when it is turned counterclockwise.
The highest rotation speed of chainsaw engines varies from 11,500 to 15,000 rpm. Higher speed can be dangerous for the engine and is simply not provided by the ignition. Therefore, the maximum speed can be determined by the occurrence of ignition interruptions. If they appear, turn screw H slightly counterclockwise.
Re-check at idle
After you have adjusted the acceleration and maximum engine speed, be sure to re-check the operation of the chainsaw at idle. When the carburetor is correctly adjusted, the following conditions must be met:
- at idle, the chain should not move;
- the engine should pick up speed quickly;
- The engine should operate like a four-stroke engine.
If the operation of the chainsaw does not meet at least one of these conditions, the adjustment procedure (except for the basic stage) will have to be repeated again.
Muffler.
You also need to check the muffler. If it is collapsible, then we disassemble it and inspect it, removing all the carbon deposits. In some chainsaw models, the muffler will have to be twisted; there is no other way to check it. The non-removable muffler is dried with a hairdryer after washing. Remember that carbon deposits contain substances that are carcinogens, and dry cleaning, which could result in their inhalation, is unacceptable. When removing the muffler, plug the engine exhaust hole with a clean rag. Do not underestimate this breakdown - the muffler will clog, the chainsaw will lose power or will not start at all. One of the reasons why the muffler may become clogged is the use of a fuel mixture with an excessive amount of oil (the amount of oil is more than the manufacturer recommends), and the use of either oil not intended for two-stroke engines or low-quality oil.
Chain lubrication system
It’s rare that a chainsaw repair manual goes without mentioning malfunctions of the chain lubrication system, which are quite common. They usually manifest themselves in the lack of or insufficient supply of lubricant to the chain and in oil leaks. If the chain turns out to be dry, first of all you need to inspect and clean the channels through which oil is supplied to the bar. Their clogging is a common occurrence.
If there is a significant (small is considered normal) oil leakage, you need to check the tightness of connecting the tubes to the pump fittings. They may fall off or crack. Violation of the tightness of the oil line, in addition to drips, can also lead to insufficient lubrication of the chain. The pump begins to suck in air, which affects its performance. Violation of the tightness is eliminated by replacing the tubes or sealing them with sealant.
Oil pumps come in different designs and can also be driven in different ways. Very often there is no need to change the entire oil pump, it is enough to change its moving part called the plunger; often it is this that fails due to the ingress of a large amount of dirt and sawdust; it simply jams and its edges are licked off. The oil pump is usually driven by a drive sprocket or a special gear on the crankshaft.
The most serious failure of the lubrication system is cracks in the oil pump housing. In this case, it will have to be replaced.
Chain brake
Failure of the chain brake to operate may occur due to contamination of the underframe space and the brake band with sawdust or grease. This also leads to tape wear. In the first case, you need to clean the under-axle space, in the second, replace the brake band.
If you have a brushcutter on your farm - use, maintenance and repair - this will help you. Moreover, you can make your own lawn mower from a chainsaw, thus unifying the tool.
Chainsaw maintenance
Before each start of the chainsaw make sure the chain is in good condition, its teeth are sharp and its tension is normal - without sagging, but not too tight, so that it can be pulled slightly away from the blade.
Sharpening of the chain is carried out both using a special machine and manually using a file and a template for a specific chain tooth pitch. In any case, the instructions for your product contain all the necessary information on sharpening the chain.
After each use of the saw, it must be cleaned. The chain, saw blade are cleaned (sawdust is removed from the chain groove), and the air filter. The saw body and engine air cooling fins, as well as other cracks and grooves, should also be freed from inevitable sawdust. After using the saw, you should turn the blade over so that it wears evenly, and also lubricate the blade sprocket located in the front part (if there are grooves for lubrication).
After a week of regular use you should:
- check the spark plug for the correct gap, make sure there is no deposits on the working elements of the spark plug;
- inspect the saw blade for the appearance of burrs in the places where the chain passes and, if any, remove them with a file. It is also necessary to check whether the geometry of the saw blade is broken - in case of bending and other damage, the blade must be replaced;
- Check the functionality of the start key and other controls.
Before long-term storage of the chainsaw, you must empty the fuel tank and oil container! And yet, the chain and bar must be stored separately, since together they rust, apparently forming an electrochemical couple.