The mower does not start, causes and remedies

Table of Contents:

Breakdown elimination methods

It is no secret that the best and most effective repair method is to prevent possible malfunctions. As already noted, one of the key points is how well the gasoline-oil mixture is prepared. Its components must be at least AI-92 gasoline and high-quality engine oil. The proportions for which the mixture is prepared are indicated in the manufacturer’s manual that comes with any gasoline trimmer. As a rule, oil is added to gasoline using an ordinary medical syringe. In this way, the easiest way is to maintain the appropriate proportions.

Quite often, if problems arise with starting the brushcutter, the owners of the tool try to carry out repairs with their own hands. With the necessary knowledge and skills, this approach will significantly reduce operating costs. First of all, it is worth checking the fuel system and, in particular, the filter element. If a blockage is found, the easiest way is to replace the filter with a new one. If the air filter has become the source of problems, then you can get out of a difficult situation even in the process of work with little time. You will need to do the following:

  • remove the filter element;
  • directly in working conditions, you can wash the filter with the used gasoline;
  • when operating a scythe at home or at a summer cottage, water and simple detergents are used for cleaning;
  • after washing, the part is thoroughly rinsed and dried;
  • a completely dry filter should be lubricated with engine oil;
  • excess lubricant is removed by squeezing the filter element with your hands;
  • the cleaned part is put in place and the plastic cover is fixed with screws.

If the described actions do not provide a positive result, then the next step is to adjust the idle speed using the appropriate carburetor screw. Many publications and videos posted on the world wide web are devoted to this topic. When trying to solve the problems in question, there are several steps you can take.

  • The trimmer is placed on the side so that the “air” is on top. This will allow the fuel mixture to flow to the bottom of the carburetor. Often, attempts to start the internal combustion engine are successful if you first dismantle the mentioned part and literally send a couple of drops of gasoline directly to the carburetor itself.
  • If, after all the described actions, the scythe did not work, then attention should be paid to the state of the candle and, in particular, the presence of a spark. In parallel, all fuel is completely removed from the combustion chamber.
  • Often, owners of petrol cutters find themselves in situations when the fuel and air filters are clean, the candles are in good order, the fuel mixture is fresh and of high quality, but the internal combustion engine does not show signs of life. In such cases, experienced specialists recommend using a universal and proven method of launching many years of practice. It is necessary to move the choke to the closed position and pull the starter handle once. After that, the damper opens and the engine is started 2-3 times. In the vast majority of cases, the result is positive.

Problems can arise with the starter itself. Often the cable breaks and the handle breaks. You can deal with such troubles on your own. In other cases, as a rule, the starter is replaced. It is worth noting that this device can be purchased assembled and installed by hand.

The spark plug can be flooded with fuel during the start of the trimmer ICE. Even with a high-quality mixture and a good spark, starting the device is unlikely to work. The most effective way out is to remove the candle and dry it. In parallel, you can check this spare part for operability, if any faults are detected, replace it. This procedure includes a number of simple steps, namely:

  • turn off the device and wait for the power unit to cool completely;
  • disconnect the wire;
  • remove the candle itself;
  • inspect the dismantled part;
  • make sure there is a gap (0.6 mm);
  • screw in a new, working plug and tighten it.

In practice, many repair work related to the fact that the scythe has stopped starting up and which sooner or later one has to deal with during the operation of a household petrol cutter can be done independently. But in case of serious malfunctions, it would be most rational to contact a specialized service. However, the key factor in such cases will be the ratio of the cost of repairs to the price of a new trimmer.

Gasoline trimmer won’t start: causes and remedies

  • Diagnostic features
  • Main reasons
  • Breakdown elimination methods
  • Recommendations for use

Taking into account the specifics of using gasoline trimmers, their owners often have to deal with certain problems. One of the most common troubles is that the brushcutter will not start or gain momentum. For the fastest and most effective elimination of such a problem, you should have an idea of ​​the main causes of possible malfunctions.

Diagnostic features

From a technical point of view, trimmers can be classified as complex devices. Based on this, it is strongly recommended to carefully study the relevant instructions before using them. However, in practice, many ignore it, often later find themselves in situations where the gasoline trimmer does not start or picks up poorly during operation. It is worth noting that similar problems can be encountered when acquiring new models of equipment.

One of the most common causes of such symptoms is a long seasonal break in the operation of equipment. In addition, poor quality and untimely maintenance can lead to extremely negative consequences. It is important to remember that this is true both for the Chinese petrol cutter and for representatives of the lineup of famous brands.

The key to effective and prompt repair will, of course, be a competent diagnostics of the device. In the process of troubleshooting, you will have to inspect and test, first of all, key elements. The list of these includes candles, a tank, filter units and fuel system valves. As practice shows, very often malfunctions of these particular elements become the reason that the brushcutter does not start. The quality and correctness of the preparation of the fuel mixture deserves special attention, especially when it comes to two-stroke engines. With regard to this parameter, the manufacturer’s recommendations should be strictly followed in order to avoid serious breakdowns and costly repairs. In the case, for example, with a piston group of internal combustion engines, costs can be up to 70 percent of the cost of new technology.

Often, trimmer owners have to deal with situations when the specified mixture is of high quality, the carburetor is in good working order and configured, and the device still does not show signs of life when trying to start the engine. In such cases, you should check the condition of the candle. The following steps will troubleshoot the problem:

  • turn out the candle;
  • wipe and dry the part (annealing is undesirable);
  • remove fuel and dry the spark plug channel for 30–40 minutes; such actions will avoid flooding the candle at the next start-up attempt;
  • completely eliminate traces of carbon deposits using a file or sandpaper;
  • set the appropriate gap;
  • put the candle in place.

If the candle turns out to be working and the seat is completely dry, and the scythe engine does not start, then the threads should be moistened with gasoline. It is worth remembering that regardless of the quality of the spark that is emitted, initially there will be nothing to ignite in a completely dry chamber. Faced with the fact that the spark does not come, it is worth paying attention to checking the contact between the high-voltage wiring and the spark plugs. If this connection turns out to be of good quality, then it will be necessary to check the operability of the ignition system control unit. In such cases, it is unlikely that it will be possible to do without the services of a qualified specialist.

The next step in diagnosing a gasoline streamer will be to check the condition of the filters. Often, the brushcutter does not start well or does not start at all on a cold one due to the clogged air filter. You can identify this malfunction by excluding it from the system. If after that the braid starts up, then you will have to clean or change this element. Experienced users are strongly advised to periodically purge the air filter to maximize its useful life.

The described tool may also not start due to problems with the supply of gasoline caused by a dirty fuel filter. To quickly and effectively eliminate such a breakdown, you just need to replace the filter element with a new one. It is important to remember that the suction inlet must be equipped with a filter, which is provided by all instructions. Failure to comply with these rules and recommendations can lead to expensive piston repairs. In the process of diagnosing and finding the source of problems with starting the mower, attention should be paid to the breather, which is responsible for stabilizing the pressure equalization in the fuel tank. In addition, it is necessary to check the cleanliness of the exhaust port and the muffler mesh. As a rule, such problems are most often encountered when troubleshooting old models.

Main reasons

As practice shows, gasoline trimmers stop starting or function normally after winter, that is, long-term seasonal storage. Before further attempts to run the tool, thorough diagnostics should be performed to determine the source of the problem. At the moment, there are several of the most common causes of malfunction.

  • Initially, it is necessary to check the quality of the fuel. Saving in such cases can have extremely negative consequences. Experienced brushcutter owners and experts advise preparing a mixture, the volume of which will correspond to the forthcoming work, since its surplus quickly loses its qualities.
  • Trimmers of such famous brands as, for example, Husgvarna, Makita, Stihl, are very sensitive to the fuel used. It is about the quality of the fuel and the octane number. Providing suitable operating conditions and extending the service life of the equipment will allow refueling with high-quality gasoline.
  • At the time of starting the internal combustion engine, the petrol cutter can stall due to the fact that it floods the spark plug. Often in such situations you have to deal with the need to adjust the carburetor. It is worth noting that similar problems arise when the braid stops getting hot.
  • Sometimes the tool cannot be started, although the plug is wet, which in turn indicates that the fuel mixture has entered the combustion chamber. As a rule, this is one of the symptoms that there is no spark. The reasons may be the lack of normal contact between the spark plugs and the high-voltage wire, or drying out of the threaded connection in the spark plug channel.
  • If there are no problems with the spark, and at the same time the candle itself remains dry, then most often this indicates that gasoline is not being pumped. There may be several reasons for this situation. We are talking, in particular, about the condition of the fuel filter and carburetor.
  • The internal combustion engine of the streamer does not start or immediately after starting it stops working, which may be due to clogging of the air filter, which prevents the normal supply of air necessary to enrich the mixture.

In addition to all of the above, trimmer owners have to face more serious troubles. One of these is the wear of the piston group. In such cases, entrust to professionals, which will significantly reduce costs and extend the life of the tool.

Recommendations for use

The stability of the operation of any brushcutter and the absence of problems with starting the power unit of such devices directly depend on the conditions in which the tool is used and the quality of maintenance. And we are talking about the following basic rules:

  • in the process of work, it is necessary to pay special attention to the cooling system and other elements; it is strongly recommended to promptly and efficiently clean the channels located on the spit body and starter ribs;
  • in the process of processing various elements, solvents, gasoline, kerosene and other effective means can be used;
  • these works should be carried out after the power unit has completely cooled down;
  • it is necessary to fully comply with all the rules specified in the relevant instructions drawn up by the developers of the described tool, which will avoid overloads in a warm engine, which in turn is the most common cause of serious damage;
  • all fuel residues in the internal combustion engine should be completely drained before long breaks in the operation of the streamer; it should be borne in mind that the gasoline-oil mixture decomposes rather quickly into the so-called heavy fractions, which inevitably clog the carburetor;
  • after removing the fuel, it is required to start the engine and let it run on XX until it stalls itself; in this way, the remaining mixture will be removed from the internal combustion engine in full.

Particular attention should be paid to preparing the instrument for long-term seasonal storage. This should be done to minimize the risk of problems with starting the engine. Competent preparation includes the following manipulations:

  • completely disassemble the trimmer;
  • thoroughly rinse and clean all elements to which there is access;
  • inspect the parts of the petrol brush in order to identify defects (mechanical damage found in this case should be eliminated);
  • pour engine oil into the gearbox;
  • carry out high-quality cleaning from clogging of the air filter element;
  • having the appropriate knowledge and practical skills, it is possible to perform partial disassembly of the power plant, followed by purging and lubrication of the moving elements;
  • wrap the assembled gasoline braid with a pre-oiled rag.

In addition to everything already listed, it is necessary to lubricate the piston group. This algorithm provides for the following simple manipulations:

  • remove the candle;
  • transfer the piston to top dead center (TDC) with the help of the starter;
  • pour a small amount of engine oil into the cylinder;
  • crank the crankshaft several times.

Regardless of the cost and brand of equipment, you should clearly follow all the requirements of the relevant instructions and adhere to the recommendations of developers and experienced specialists. Today, detailed information regarding the correct use of such equipment can be easily found on many specialized sites and forums.

mower, does, start, causes, remedies

It is important to remember that competent operation of the brushcutter and its timely maintenance (independent or in service) is a guarantee of the longest possible service life and minimum costs.

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Next, watch a video on how to determine and eliminate the reason why the gasoline trimmer does not start.

The petrol cutter will not start, the spark has disappeared

The loss of a spark entails checking the contacts and the correctness of the gap between them, the conducting wires to the candle and the candle itself.
The way to check the spark is to unscrew the candle, connect a wire to it, put the candle sideways to the motor casing and pull the starter several times as if starting a petrol cutter, while looking at the coal and the contact of the candle, a spark should run between them.
If there is no spark, take a new candle, follow the same procedure, if the spark cannot be traced, then there is a problem in the wire or contacts, it is better to replace them.

The gasoline cutter won’t start after winter

In such cases, the unit must be serviced. Remove the fuel system, including filters (air, fuel), disassemble the carburetor, clean and rinse each unit. Blow out the filters with air. Pay attention to fuel quality and octane number.

mower, does, start, causes, remedies

It should be borne in mind that products of such well-known companies as STIHL, Husgvarna and other brands will not run on cheap, low-octane gasoline.
Suitable fuel for them is from the AI ​​brand. 92 and higher from car gas stations and then from well-recommended ones, since there is also bad gasoline at gas stations. The use of high-octane and high-quality gasoline will determine how long the brushcutter will be used and how long it will last.

It is necessary to take into account one more fact that with a long storage of a diluted fuel mixture, its working qualities fall, which also leads to consequences in which the petrol cutter will not start. Therefore, it should be diluted in portions, that is, the amount of the mixture that is produced at a time.
The operating instructions clearly describe and explain the mixing ratio of gasoline and oil. Strict observance of the correct proportions will at least save you from several questions, why the petrol cutter will not start and what to do in such cases.

The benzokos starts up and stalls. What to do?

There is a spark, and everything seems to be normal, but the petrol cutter will not start, in such cases, the air access valve to the fuel tank should be checked. A clogged valve leads to the creation of a vacuum in the tank, in which the carburetor does not receive enough gasoline, so the brushcutter will start, but then stall. To exclude this reason, you need to clean the valve and try to start a petrol cutter with an incompletely twisted tank cap.
2. If the petrol cutter does not start at the same time, you should remove and clean the fuel filter, as well as check all the carburetor parts, and then try to start. The petrol cutter will not start again, the air filter is disconnected, try to start without it, if the mower starts up, the reason is in the air filter, replace it.

The benzokos does not start on a cold

When starting a cold engine, it is not recommended to press the gas. Tilting the brushcutter so that the air filter is on top, press the fuel suction button 5-6 times, set the function switch lever to the “start” position, pull the starter cord several times until the engine starts. After a few seconds of running the motor, turn off the starting system.

The petrol cutter will not start or it will start, but it stalls. What is the reason?

To understand this, you need to know the principle of operation of the unit as a whole. It also happens that, just bought, a new saw does not start, and it starts running around the service centers, in such cases it is recommended:

carefully read the instruction manual;
to study in detail the method of the first start-up and running-in of petrol cutters;
try to understand how the product works;
how gasoline is pumped up and so on.

Riding Lawn Mower Doesn’t Crank or Click

Reasons for malfunction of petrol cutters:

the quality of the gasoline is poor;
incorrect proportion of gasoline and oil;
clogging of the fine filter;
the spark was gone.

The benzokos does not start when hot

If the brushcutter was recently in operation and has not yet had time to cool down but does not want to start, press the gas trigger, pull the starter cord sharply several times until the engine starts and only then the gas trigger is released. If enough time has passed and the brushcutter has managed to cool down, then it is necessary to start it as if it was cold.
If the above methods did not help, the petrol cutter did not start, then you should contact the service center.

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The second is the carburetor

It is not necessary to disassemble the unit right away, especially if the engine stalls after starting or does not keep idling. Try changing the fuel first, it may have an excess of oil. You can inject a purifier into the air filter, let the motor “shit a little” at maximum speed.

Next, we go in order. the air filter, the fuel filter (it can be outside and in the tank), the fuel pumping button, the integrity of the hoses. Gas tank cap. the ventilation valve may be clogged, the motor simply does not pump gasoline. Blow everything out. and it will work!

Be sure to. look at the connection of the carburetor to the intake manifold! Elsi sucks air there and there is no tightness. eliminate!

The dosing needle hangs up. also a problem in some models. It is enough to push it down, or remove and grind it with velvet.

You can pull off the hose from the carburetor, see if fuel goes to it when pumping. It is clear that often for checking you need to remove the plastic sheathing, break your fingers on the latches, but anyway, sooner or later you will have to climb there.

Everything whole, clean, works?

Trying to adjust. We take a long screwdriver, find the idle speed adjustment bolt (it is located on the throttle valve), twist it a couple of turns so that the damper opens slightly. We start. Does it work smoothly? Then let’s move on. Doesn’t it start or stalls? Opens the damper until it starts up stably.

Then we adjust the quality of the mixture with screw L. It is necessary to achieve maximum idle speed. Here the principle is reversed. the more the bolt is unscrewed, the richer the mixture. After that, the quality of the mixture is adjusted at maximum speed with the screw H.

If the carburetor adjustment has not yielded fruit, then it needs to be disassembled. Watch the membrane, clean the jets and internal passages. For this, it is necessary not only to have a repair kit, but also, preferably, a spare carburetor.

The first is the candle

The first step is to unscrew the candle. If it is wet, the ignition system is faulty. Try to wipe the spark plug, put it in the cap, attach it to the engine, jerk with the starter. Is there a spark? If not, then you need to change the candle.

Replacing the spark plug didn’t help? Then you need to watch the magneto, cable, ignition coil. The cable is ringed, the coil is checked for resistance (the multimeter is in the resistance measurement mode at 200 Ohm, one contact is for ground, the other is to the output of the coil, it should show from 0.4 to 2 Ohm).
Sometimes the magnets on the flywheel get dirty, or the key is licked off, and the ignition moment flies away. Chinese shit throws up all sorts of surprises, but for the most part everything can be revealed visually.

Be sure to pay attention to the plaque of the candle. If it is black, the candle is smoked, then the mixture is rich, or you have mixed the fuel incorrectly. If the plaque is white, it means that the mixture is poor, and the engine could already die of temperature. Ideally, the color should be brick, light, without much plaque.

Again, if the black candle is dead, you should not immediately sin on the carburetor and ignition. Screw in a new one, see what the plaque will be. Maybe the candle was just of poor quality.

The petrol cutter will not start: causes and remedies

  • 3-11-2019, 14:38
  • House / Land
  • Administr
  • 20345

Diagnostics and reasons why a two-stroke petrol cutter will not start. A quick return to life of Chinese and domestic brushcutters and ways to eliminate carburetor breakdowns.

It happens that a two-stroke motor does not even show a flash in the cylinder, but sometimes it catches it and immediately stalls. Don’t be sad, this Chinese commodity can be repaired right on the knee with a minimum of tools.

Before starting diagnostics, you need to make sure that the motor rotates with little resistance. If there is no compression in it, then further is useless, and you need to change the piston (there is nothing complicated about this either, everything is like a designer).

What is the resource of a Chinese brushcutter?

A Chinese or Russian brushcutter is capable of working about 500 hours. But this is with the right mixture, good oil, good factory assembly. If a person pours gasoline from one good gas station, accurately measures the same oil in a beaker, regulates the carburetor for the same mixture, the fuel burns correctly, then the longed-for half a thousand hours of motor life is quite an affordable bar.

But here we must also not forget about the Chinese marriage. They even balance the shafts on the knee, install the cheapest bearings, and stamp the carburetors with clogged channels. If a person understands the principle of operation of a two-stroke engine and a carburetor, understands how to sort it out, then he can eventually assemble an almost perfect trimmer.

In general, if we consider a Chinese brushcutter as a space for creativity, then even its breakdown is a reason to learn something new, this is a constructor for a man.

If you need just a tool, then you should look for a Japanese analogue, or switch to an electric model.

Identifying and eliminating obvious chainsaw malfunctions.

To determine the reason why the chainsaw does not start or stalls when starting, it is necessary to troubleshoot the tool. The essence of the procedure is to consistently inspect the condition and operation of the main working elements of the saw motor. At this stage, we check:

  • Spark plug present;
  • Fuel supply;
  • Filter status;
  • The operation of the breather of the stalling unit built into the fuel cap;
  • Discharge duct function.

to the content

Checking the spark on the spark plug and eliminating the causes.

The first step in looking for reasons why your gasoline saw won’t start is to check the spark on the spark plug. There are many factors that affect the performance of this element. However, the main ones at the initial stage of instrument troubleshooting are:

  • Incorrect carburetor adjustment;
  • The presence of more than it should be, the amount of oil in gasoline;
  • Clogged air filter.

All of them contribute to the formation of carbon deposits on the spark plug electrodes. In 50 cases out of 100, the saws do not start on a cold one due to the absence of a spark due to carbon deposits on the electrodes and their corrosion. As a result, the gap either decreases or increases.

Checking the spark plug with an idle chainsaw

It is quite easy to check for a spark. This will require:

  • Remove the tip of the high-voltage wire;
  • Unscrew the candle;
  • Put the tip back on;
  • Lean the candle with a skirt against the cylinder;
  • Start with a starter.

If a good spark is observed between the electrodes at the time of starting the engine of the chainsaw, then everything is in order with the ignition unit. If it is not there, then it is worth cleaning the element itself and checking the gap of the electrodes. If necessary, use a special probe to adjust the distance between the contacts.

For candles from different manufacturers, the distance between the electrodes may fluctuate. For some, it may be equal to 0.5 mm. Others have 0.2 mm. Therefore, carefully study the manufacturer’s recommendations.

There may be no spark on the spark plug for other reasons. Of the main faults affecting the poor start of the chainsaw and the unstable operation of the internal combustion engine at idle, from which the tool can stall, the following can be attributed:

  • Overflow of the spark plug channel with fuel;
  • Lack of contact between the high-voltage cradle and the tip of the candle;
  • Failure of the ignition unit.

How to start a cold chainsaw if the spark plug channel is constantly flooding with gasoline? To eliminate the problem while starting the tool, you can use the following algorithm:

  • Unscrew the candle with a special key;
  • Wipe it with a clean and dry cloth;
  • Dry for 20. 30 minutes;
  • Remove carbon deposits with a file and adjust the gap between the electrodes;
  • Drain the remaining fuel from the spark plug channel and dry it;
  • Collect everything and try to start the mechanism.

As a rule, these measures are enough to start the chainsaw and get the job done. However, this extreme measure does not eliminate the main reason why the engine does not start or stalls. improper operation of the carburetor, which needs fine adjustment.

If there is no spark and poor contact of the high-voltage cradle with the spark plug tip, check the connection. The check can be carried out using a conventional tester. If a defect is found and it is eliminated, the chainsaw should start without any problems.

If the check showed that the contact is reliable, and the saw does not start further, look for the cause in the ignition unit. As a rule, a faulty unit cannot be repaired and restored. A complete replacement is required here.

Determine the availability of fuel and its supply.

First you need to make sure that there is a fuel mixture in the tank of a chainsaw that does not want to start, and it regularly enters the carburetor. With a full tank, we check how the mixture is fed through the gas line. We disconnect the fuel system pipe from the carburetor and try to pump it up. In the case of a complete order, when pumping up, gasoline will be supplied in jerks in accordance with the norms set by the manufacturer. Poor or no fuel supply may result from:

  • The fuel supply channel is clogged;
  • Debris-clogged fuel filter.

Often the reason for a poor start of the chainsaw can be a tank that is too full. In this case, you should pay attention to the presence of smudges under the saw case cover. If present, see the connection of the gasoline feed pipe to the carburetor. Most often, it is squeezed out by pressure when the tank cap is screwed on, which is filled under the very neck, which prevents the engine from starting.

The quality of the fuel mixture can also be one of the reasons why the chainsaw does not start. If, after completing the work, the remaining gasoline is not drained, and the tool is left for long-term storage (more than 2 weeks), then the processes of resinification and polymerization of the components will begin to occur inside the tank. What can cause carbon deposits on the piston, rings and cylinder liner. Therefore, always prepare the mixture only in the required amount before work.

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Chainsaw outlet check.

One of the reasons that a chainsaw does not start well may be a clogged exhaust channel or its muffler. At the same time, a drop in power is noted in the process of sawing sawn timber and logs. This is most often due to resinous deposits on the spark arrestor or muffler channel, which are formed during the combustion of a poor-quality mixture of gasoline and oil, which impede the removal of exhaust gases.

Resonator clogged with carbon deposits can cause poor starting of the gasoline saw.

Eliminate the reason for the poor start of the chainsaw, in this case, you can remove the accumulated combustion products. To do this, perform a number of manipulations:

  • Remove the muffler by unscrewing the screws;
  • Remove the cooling panel and gasket;
  • Remove the spark arrestor;
  • Disassemble the resonator housing;
  • Wash all elements from carbon deposits with a detergent;
  • Let them dry completely;
  • Collect everything in reverse order;

To prevent dust and sand from getting into the cylinder when cleaning the muffler, cover the outlet of the chainsaw engine with a clean rag.

Finding reasons why the chainsaw won’t start

Amateur and professional chainsaws are complex devices. The service life of their two-stroke engines, components and assemblies has its own limitations. For this reason, quite reliable and expensive tools, along with cheap Chinese units, periodically fail and refuse to start. The situation when the chainsaw does not start or stalls is not very pleasant and sometimes confuses the user. How to identify and correct a malfunction by returning the instrument to work.

  • Identifying and eliminating obvious chainsaw malfunctions.
  • Checking the spark on the spark plug and eliminating the causes.
  • Determine the availability of fuel and its supply.
  • Checking the condition of the fuel and air filters.
  • Checking the breather and cleaning it.
  • Chainsaw outlet check.
  • What to do if the chainsaw won’t start further?

Checking the breather and cleaning it.

The breather is another element, from the improper operation of which the chainsaw may not start or stall during the sawing process. This element is located on the fuel tank cap in the area of ​​the air hole. This is a kind of valve that does not allow gasoline to flow out and equalizes the air pressure required for the free flow of fuel into the carburetor.

If the breather is dirty, the working chainsaw stalls, and when it starts, it refuses to start. The thing is that air stops flowing through the hole. As a result, a negative pressure (vacuum) is created inside the fuel tank, which prevents the flow of gasoline to the carburetor.

Defining the problem is pretty straightforward. Disconnect the fuel hose from the carburetor and see what happens to the gasoline. If it flows freely in a good trickle, then everything is in order with the breather. If it is absent or it flows weakly and intermittently, then the reason is identified. the breather is clogged with dirt. You can solve the problem by cleaning the air hole with a regular needle or a powerful jet of compressed air.

Checking the condition of the fuel and air filters.

If everything is in order with the fuel quality, the chainsaw engine may not start due to clogged fuel and air filters. To diagnose these elements, it will be necessary to perform a number of manipulations associated with their dismantling.

For the fuel filter:

  • Disconnect the gasoline supply channel from the carburetor;
  • Pump up fuel.

If there is little or no pressure in the branch pipe, disconnect the filter. Before this, free the tank from the mixture and remove the filter element itself. Dismantling is done with a wire hook. A clogged replacement cartridge that causes a poor starting of the chainsaw engine can be cleaned, but it is best to replace it with a new one. When using the tool in dusty conditions, it should be cleaned on a regular basis.

A clogged air filter can cause the chainsaw engine to run erratically, making it stalling or difficult to start. Dust and dirt deposited on the adsorbent material impede the flow of air into the system, make the fuel mixture so rich that it will sometimes be difficult to start the tool.

Checking the air filter is one of the first steps in finding the cause of a poor start.

Care should be taken when removing the air filter, as dust accumulated on the surface of the saw during operation can enter the carburetor. And this is fraught with more expensive repairs. After detaching the cartridge, thoroughly clean it of accumulated dirt and rinse it with the addition of detergent. Dry the element and put it back in place just as carefully.

Why the petrol cutter won’t start. we troubleshoot

Caring for the personal plot, summer residents periodically encounter the fact that the petrol cutter does not start. There are many reasons for tool failure. To correctly diagnose the problem, the owner of a useful unit in the country needs to know the device and the principle of operation of its individual parts.

  • How to start diagnostics of brushcutters
  • Checking the fuel mixture
  • We carry out diagnostics of the candle and candle channel
  • Diagnostics of filters for petrol cutters
  • Breather and exhaust port
  • complex reasons for the failure of the brushcutter
  • Rules for the operation and storage of petrol cutters

Diagnostics of filters for petrol cutters

Another reason why the gasoline scythe stalls is the air filter. To eliminate it, try removing the filter and starting the trimmer without it. If it works out, then you will have to change the air filter to a new one, or at least blow through and thoroughly clean the old one.

The petrol trimmer may not start if the fuel filter is dirty. This is the next step in our algorithm. Here we check the condition of the filter element and, if necessary, replace it with a new one. When replacing, try not to leave the suction inlet without a filter at all, this is prohibited by any operating instructions. Haste can turn into repair of the engine piston group.

Breather and exhaust port

Often, “gentle” branded models of petrol cutters do not start and stall due to the contamination of the breather. The main function of this element is to equalize the pressure in the gas tank. When this unit becomes clogged, a vacuum is created in the tank, which prevents the supply of fuel. You can eliminate the malfunction by cleaning the breather. You can use a regular needle for cleaning.

Normal operation of streamers with internal combustion engines can be disrupted due to the ingress of dirt into the exhaust duct or clogging of the muffler mesh. There is such a problem on older generation models. The issue can be resolved by traditional cleaning and removal of the anti-spark grid.

How to start diagnostics of brushcutters

If the petrol cutter does not start or immediately stalls after starting, it is necessary to sequentially check all the main components and assemblies. The verification algorithm is as follows:

  • Fuel tank (fuel quality);
  • Candle and candle channel;
  • Air filter;
  • Fuel filter;
  • Breather;
  • Exhaust channel.

These nodes are most often the source of major problems that can be eliminated after a thorough inspection.

Checking the fuel mixture

Before starting the engine of the gasoline streamer, check the presence and quality of the fuel mixture. Do not save, do not be greedy and “do not be clever” in this matter. Repair or replacement of the piston group will cost you too much (sometimes up to 70% of the cost of a new tool). Prepare the oil-fuel mixture strictly according to the instructions. Calculate its amount based on real needs. Excess gasoline left over after work loses its quality over time.

complex reasons for the failure of the brushcutter

If the step-by-step troubleshooting algorithm does not work, and your scythe still does not start or stalls, it is worth inspecting the carburetor and the engine itself. A clogged carburetor can be one of the reasons for erratic tool performance. There are three main problems here:

  • Clogged ducts or nozzles. All this is cleaned by special washes or blown by a powerful jet of compressed air from the compressor. Do not use needles and wires, as the bore may be damaged;
  • Worn carburetor gasket. Exit. replacement of a failed gasket;
  • Violation of tightness. To check this indicator, you can use an ordinary household tonometer, replacing it with a suitable pressure gauge. Watch the readings: if they do not change, everything is fine, but if the pressure starts to drop, then some part of the carburetor is faulty. We’ll have to find it and replace it with a new one.

If everything is in order with the carburetor, then the gasoline trimmer may not start due to wear of the piston group. If chips, scratches or scuffs are found on the piston or cylinder, they should be replaced. Piston rings are subject to mandatory checks. A small backlash of the piston when rocking the connecting rod indicates that it is time to change the rings. It is best to entrust this procedure to the specialists of the service center.

We carry out diagnostics of the candle and candle channel

If the quality of the fuel mixture is not in doubt, and the brushcutter stalls at start-up, then a flooded candle may be the cause. Here, for repairs, an ordinary candle wrench is suitable (every motorist probably has) and a spare candle.

  • We unscrew the candle and wipe it;
  • Dry it thoroughly (do not ignite);
  • We drain the excess fuel in the chamber through the spark plug hole and dry it;
  • We clean the old candle from carbon deposits using a file or a lady’s file;
  • We set a gap with a distance of 1 mm (you can check with any coin);
  • We put everything back in place and try to start the trimmer.

It is necessary to dry the canal for at least 30–40 minutes. Otherwise, there is a risk of re-filling and a new candle.

If the candle is working, the socket where it is located is completely dry, and the petrol cutter does not want to start, lubricate the threaded connection with gasoline. It should be slightly damp. No matter how wonderful spark the candle gives out, there is simply nothing to light up in a dry chamber.

If the trimmer motor still does not start, a reason such as the absence of a spark due to poor contact between the spark plugs and the high-voltage wire should be ruled out. If the connection is of good quality, and there is still no spark, most likely, your ignition unit has “flown”. Here it will not be possible to do without a master, since the part is not repaired, but is sold as a single unit.


A special oil-gasoline mixture is prepared by the owner of the tool manually, so inaccuracies are possible here. The desire to save on fuel has a bad effect on the tool, up to its complete inoperability. To keep everything working smoothly, make sure you are using the highest quality gasoline and oil that is specified in the instructions. A properly formulated mixture can be stored ready-made for no longer than two weeks.

Gasoline fuel loses its properties in the third week and will not be able to power your instrument normally. Chinese-made chain saws are especially sensitive to the quality of the mixture. Sometimes you have to go through several different oils before you achieve a smooth and high-quality stroke.

Insufficient chain lubrication

The reason for this may be clogged hoses, their deterioration and, as a result, leakage. A poorly lubricated chain and disc will wear out quickly. Check if the oil feed is good. start the saw and point it at a clean sheet of paper. If there are microscopic drops on it, flying off the rotating chain, everything is in order. If the sheet is dry, you will need to clean the hoses that supply lubricant to the disc and chain. Be sure to check the joints and joints of parts with hoses. Leaks must be cleaned, degreased and sealed.


Filters tend to clog and lose bandwidth. To check the fuel filter, disconnect the fuel hose from the carburetor and pump the gasoline mixture. If it comes out in an even stream, the filter is in order. If it starts to drip or flow in a thin stream, the filter is clogged. It’s almost useless to clean it.

Better change the cartridge to a new one. As for the air filter, it gets clogged if you cut something that is very fragile or dusty. Take out this element very carefully so that debris that has settled on it does not get into the carburetor. After removing, rinse, clean and dry, and then gently put back in place.

Cylinder-piston group

This is the last possible source of the problem and the most difficult to repair. First, check its serviceability. In place of the spark plug, screw the compression gauge and start the saw. If you do not have this device, simply close the candle hole with your finger and start the mechanism. If you feel a strong retraction, then everything is in order with the cylinder-piston group. If there is no compression, then you will have to conduct an external examination.

The slightest dents and chips will immobilize the cylinder. You can make it wider and put a new piston, or you can replace the entire group, then the tool will serve you longer after repair.

Why the chainsaw won’t start: causes and remedies

To facilitate physical labor, mankind has come up with working tools. They serve to influence objects and materials. There are mechanical tools and those that are powered by pneumatic, hydraulic drives, fuel energy, or electricity. The tools are used in construction and for minor repair work in everyday life. One of the most popular tools is the chainsaw. It is a reliable tool that can be used to cut and shape solid objects and materials. But the chainsaw does not always work properly. This article will discuss the cases in which the new chainsaw refuses to work, the causes of this problem and how to fix it.

  • New chainsaw won’t start
  • Causes
  • Solutions
  • The chainsaw does not work: causes and remedies
  • Fuel
  • Spark plug
  • Filters
  • Muffler
  • Hoses and connections
  • Carburetor
  • Ignition system
  • Cylinder-piston group
  • Chainsaw mechanisms do not work: reasons and solutions
  • Insufficient chain lubrication
  • Fuel quality
  • Cleaning
  • Wear of parts
  • Filling the engine
  • Preventive measures
  • Wear of parts

    Most often, the chain sprocket, chain tire, spark plug and piston rings fail. It is recommended to change them as the tool is used. If you are not doing service and the saw suddenly breaks down, replace the spark plug first. It becomes covered with carbon deposits, the electrode tip comes off the wire. A new plug can solve the problem of normal starting. The guide bar and sprocket are consumables, so they need to be replaced more often than candles. They guide the chain to determine the quality of the cut, and it is very dangerous to operate the saw with a worn bar. Replace these parts at a service center or buy similar and replace yourself.

    Piston rings will fail when sawing hard materials and under significant continuous stress. Vibration breaks them, they become covered with cracks, the cylinders begin to sink. Wear is indicated by poor traction, low power, smoke draining from the muffler. Replacing is easy, the main thing is to remove the cylinder-piston group from the saw body and clean it from fuel traces so that the new rings lie on the clean pistons.

    Spark plug

    This reason is easy to determine. If the spark plug is faulty, the device starts up and stops working immediately. The accumulation of the fuel mixture on the electrodes and the buildup of carbon deposits on them leads to a malfunction of this element. To get rid of this problem, remove this element, remove the carbon deposits with a file, turn it out and wait half an hour for it to dry. Drain the rest of the mixture, put the candle in place and you can continue working.

    If this element is dry, its malfunction lies in the large distance between the tip and the sparking wire. Check the spark: remove the tip, remove the candle, put the tip in place, place the candle so that it touches the cylinder with its skirt. Start up. If the spark is visible and large, the spark is not the problem. If the spark is weak, reduce the distance between the electrodes using a special feeler.

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    Why won’t the chainsaw start? Frequent malfunctions and how to fix them

    When handled correctly, chainsaw breakdowns rarely occur and are quickly eliminated if the owner knows where to look for the cause.

    And yet, the question of why the chainsaw does not start cannot be answered unequivocally. This tool is basically a conventional two-stroke internal combustion engine. For its normal operation, four conditions are necessary: ​​fuel, air, spark and lubrication.

    The carburetor is responsible for the preparation of the air-fuel mixture, the filter cleans the air from dust, the spark is created by the ignition unit and the spark plug, and the lubricant is in the gasoline.

    The reasons why the chainsaw refuses to start should be sought sequentially, starting from simple ones and moving on to more complex ones. Anyone who immediately rushes to disassemble the carburetor when the chainsaw does not start well when hot is at great risk. It is better to repair and adjust this unit in a specialized workshop, and not on the knee.

    For trouble-free operation of the chainsaw, you need to pay special attention to the fuel. If the fuel mixture is improperly prepared, then even the reliable Husqvarna will not start. In this case, the owner will begin to look for the cause of the malfunction anywhere, but not in the fuel. To eliminate this factor, you must always prepare a fuel mixture from high-quality gasoline and the brand of oil specified in the instructions.

    You need to do it in such an amount that it is completely worked out in 1-2 weeks. If you keep it in a canister for a month, then gasoline will lose its octane quality and problems with the operation of the saw are guaranteed to you.

    Quite often, chainsaw malfunctions occur due to the spark plug being flooded with gasoline at the time of start. This problem is eliminated by unscrewing and drying the candle (without igniting!) The excess fuel is drained through the candle hole, after which they take a 20-30 minute break, then put the candle in place and repeat the start. A good owner always has new candles in stock to exclude this part from the list of suspects when troubleshooting.

    The absence of a spark is often caused not only by the failure of the spark plug, but also by poor contact between its tip and the high-voltage wire. If this connection does not arouse suspicion during the check, but the spark does not appear when the starter is turned on, the electronic ignition unit is to blame. This unit is not being repaired, but replaced by a new one.

    Remember that inspecting the spark plug provides important information. If it is dry, it means that no fuel enters the cylinder and you need to check the entire chain of its supply, starting from the carburetor. Black carbon deposits indicate improper adjustment of the carburetor, supplying too much fuel to the mixture or oil overflow into gasoline.

    If the chainsaw starts and stalls when you press the gas, this indicates poor fuel flow. The cause may be a clogged fuel filter or carburetor jet. The first node can be checked and cleaned very quickly, but in the second case it is better to trust the specialists.

    Disassembling and cleaning a chainsaw carburetor requires experience and care. Therefore, only those owners who have already repeatedly and successfully performed this procedure are usually taken for it.

    The air filter should also be given attention so as not to look for the cause of the chainsaw malfunctioning in the wrong direction. If it is clogged with dust, then you cannot count on easy start-up and stable operation.

    This valve equalizes the pressure in the gas tank as the fuel is consumed. When it becomes clogged, a vacuum forms in the tank and fuel stops flowing into the carburetor. This disease is treated by cleaning the breather with an ordinary sewing needle.

    Removing the breather from the list of suspects is easy. To do this, disconnect the fuel hose from the carburetor and see if fuel is leaking from it. When gasoline flows in full stream, the breather is clean, if fuel does not flow from the gas line or flows out very slowly, then the cause of the malfunction is established.

    Many owners of new chainsaws Stihl are frightened by the increase in idle speed after the first tanks of gasoline are used up. Experts consider this behavior of the saw to be normal and indicates that the engine and carburetor running-in is normal. Therefore, do not rush to contact the service, but just slightly reduce the engine speed with the idling screw of the carburetor.

    If the power drops and the chainsaw stalls at idle, do not forget to check the muffler, which may be clogged with tarry exhaust deposits. Cleaning the exhaust port and muffler eliminates these problems.

    It is especially unpleasant for the owner when all possible reasons seem to have been eliminated: a new serviceable candle is installed, the carburetor is cleaned neatly and correctly, the fuel is normal, but the chainsaw still does not want to start.

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    In this case, you need to look into the cylinder-piston group. Visual inspection of the cylinder and piston in this case helps to find the cause. If chips or scuffs are noticeable on them, then the saw will work normally only after replacing these parts. This problem can be eliminated by boring the cylinder for a new oversized piston.

    If there are no visible defects on the cylinder and piston, then the piston rings are checked. To do this, the piston is inserted into the cylinder and slightly shaken by the connecting rod. If play is felt, then the rings are worn out and need to be replaced.

    Chainsaw breakdowns often occur due to insufficient chain lubrication due to oil line leakage and clogged channels. Therefore, if the chain becomes dry, it is necessary to urgently clean the channels that supply oil to the tire. Then an inspection of the joints of the pipes with the oil pump fittings is carried out. If there is a strong leakage of oil from the points of contact or cracks in the oil line, the pipes are changed, and the joints are sealed with a high-quality sealant.

    Some parts of chainsaws must be changed after the expiration of the passport service life. Therefore, do not forget to look at the instructions, where they are clearly spelled out. Such parts include the tire, the drive sprocket, the chain, parts of the anti-vibration system.

    If the replacement is not done on time, the wear of these components will negatively affect the serviceable parts of the chainsaw. For example, a long delay in replacing a drive sprocket results in increased vibration, which quickly breaks down the crankshaft bearings.

    Therefore, it is necessary to regularly check the working depth of the teeth, which should not exceed 0.5 mm. The tire resource is usually enough for 3-4 chains, after which it also needs to be replaced.

    Contamination of the main filter elements of the chainsaw, negatively affects its operation.

    For example, a dirty air filter will not fully supply air to the carburetor, which will affect the quality of the air-fuel mixture and normal engine starting. Contamination of the fuel filter will make it difficult or even completely cut off the gasoline supply to the carburetor and make it impossible for the engine to work.

    Fuel problems

    As with the difficult hot start option, problems in the fuel system can affect a cold start or failure to start. Carburetor adjustment, fuel filter and line contamination are all reasons that cause start-up difficulties.

    Diagnose the fuel system, this is the first thing you need in case of difficult cold start.

    It is worth paying attention to the quality of the fuel, because when using a mixture of gasoline and oil, in which there is a small amount of water, starting can be significantly difficult or impossible.

    The mixture must be used sufficiently fresh, because when storing gasoline diluted with oil for more than a month, its properties are lost and it complicates starting, both on a cold and hot engine. For this reason, gasoline can burn poorly.

    Chainsaw will not start when hot

    In cases where the chainsaw does not start up hot, you need to conduct a visual inspection of all the main units of the chainsaw. Inspection should start with the spark plug. Check the spark, inspect the surface of the spark plug electrode, these steps will help establish the direction in which to look for the problem.

    The gap between the ignition coil and the flywheel

    An incorrectly set gap between the flywheel and the contacts of the ignition coil affects the quality of sparking, which in turn is responsible for normal start-up and stable operation of the engine.

    Engine jammed

    Quite often there is a situation when the saw worked and stalled abruptly, the cause of which was the engine jamming, which in turn occurred as a result of a break in the piston skirt, destruction of the crankshaft bearing, protrusion of the piston pin cork ring or a fracture of the piston ring.

    A jammed engine can be easily identified by pulling on the starter cord. In the case when the starter does not turn, most likely, it has jammed, and further repairs are possible only at the service center.

    Fuel system problems

    If during inspection it was found that there is a spark, and the spark plug is dry, then there are problems in the fuel system. Checking it should begin with the fuel filter. Next, you need to inspect the fuel hose and its attachment to the carburetor, pay attention to fuel leaks from the carburetor and the presence of gasoline in the air filter housing. It is advisable to start removing the carburetor only if visual inspection did not allow determining the cause of the breakdown.

    A common symptom of a problem in the fuel system is excess fuel in the engine cylinder. Typically, this is indicated by an overly wet spark plug and the presence of a spark at the plug contacts. In this situation, it is necessary to turn the chainsaw over so that the plug hole is directed downward. If, at the same time, gasoline flows from the cylinder, then the reason that the chainsaw does not start is the overflow of fuel into the engine.

    “Fills” with fuel, sometimes due to improper adjustment of the carburetor, or its malfunction.

    You can familiarize yourself with the process of adjusting the carburetor using the example of the Champion 254 saw, by watching the video instruction.

    What to do if the petrol cutter won’t start?

    There are several reasons why the brushcutter may not start: low-quality fuel, malfunction of any part, or long downtime. Sometimes problems even arise with a new, just purchased instrument. So that you do not waste time and money on visiting the service department, we advise:

    • firstly, familiarize yourself with the operation manual in detail, where the process of starting the petrol cutter is outlined in stages;
    • secondly, to inspect the product, it may be necessary to repair any part;
    • thirdly, if the first 2 tips did not help, study the reasons why the petrol cutter will not start, and the ways to eliminate them that we offer.

    The most common reasons why the brushcutter won’t start

    • Poor quality fuel. What gasoline do you use for your scythe? STIHL and Husqvarna tools will not run on cheap fuel, they need at least 92 gallon fuel from a reputable gas station. It is not worth saving on gasoline, since the repair of the cylinder-piston group can be a third of the cost of the tool itself.
      When preparing the fuel mixture, observe the proportions of fuel and oil, which are indicated in the operating manual. Please note that gasoline mixed with oil will lose its properties over time, so it must be used within two weeks. Always keep the fuel mixture fresh.!
    • Fuel filter in the tank. If the brushcutter does not start, be sure to check the condition of this part. Please note that the inlet must not be left without a filter.
    • Have you checked everything you can, but still the petrol cutter will not start? You may have forgotten about the air filter. It must be removed, and then try to run the tool without it. Starts up? This means that you need to clean the old or install a new filter.

    Types of starting petrol cutters

    What needs to be done first? Press the throttle lock and trigger trigger to set the throttle to the start position. Then we press the start button. Let go of the throttle lock, throttle trigger and start button. Thus, we have activated the throttling function. To return the engine to idle speed, you must press the throttle lock and the throttle trigger again.

    Cold start petrol cutters

    Please note that the throttle trigger must not be pulled before the engine starts and starts running.

    • We place the tool on a flat surface and slowly press the fuel pumping button up to 10 times, the number may vary depending on the model.
    • Then we set the lever of the start system switch to the “START” position.
    • Pull the starter cord sharply until the engine starts.
    • Run the power pack for 5-10 seconds and then pull the throttle trigger to disengage the starting system.

    Starting a warm engine petrol cutters

    • Hold the throttle trigger pressed and do not release until the engine runs evenly.
    • We sharply pull on the starter cord and wait until the power unit starts. The trigger in this case must be pressed.
    • A warm engine is started within 10 minutes after it has stopped. If more time has passed, then use the instructions for turning on the cold unit.

    Starting the engine with a flooded spark plug

    In this case, the power unit can be started by placing the starting system lever in the RUN position, the throttle trigger must be pressed down. Then we pull the starter handle as many times as it takes to start the engine. If the power unit does not start for a long time, it is worth contacting the service center for help.

    How easy is it to start a petrol cutter? To do this, you need to know a few tricks.

    If your petrol cutter starts, but does not do it as easily as we would like, we suggest using the following tips:

    • Lay the instrument on its side with the air filter at the top. What will it give? The fuel mixture will flow exactly to the bottom of the carburetor. You can also remove the air filter and pour a couple of drops of the mixture into the carburetor and then reinstall all the parts. The tool will start on the first try!
    • Perhaps the problem is in the candle, and then, unfortunately, the previous method will not help. But there is another! Unscrew the spark plug, check it for proper operation and dry the combustion chamber. If the part shows no signs of life, replace it with a new one.
    • A universal tip that will help you start both a petrol cutter and a saw with a snow blower. But it works if the spark plug is in good working order, the fuel mixture is fresh, the air and fuel filters are clean. So, close the carburetor flap and perform one movement with the starter. Next, open the flap and pull the starter again 2-3 times. We repeat the procedure, after 3-5 cycles the engine will start to start.