New chainsaw won’t start reasons

20th March 2021

Is there fuel in the tank and what is its quality

Checking for the presence of fuel in the tank is the first thing to start diagnostics with. Even if visually there is still fuel in the tank, make sure that the fuel line is lowered into it. If the fuel in the tank is at the bottom, then this is the main reason that it is impossible to start the engine. After adding fuel to the tank, it is necessary to pump the system, and only then carry out a test run of the engine.

If there is enough fuel in the tank, check that the supply hose inside the tank is not detached. On some models of chainsaws, such a malfunction is a “disease”. If the tank is full, this does not mean at all that the breakdown is not related to the fuel system. Check the quality of the fuel (oil and gasoline). Gasoline for chainsaws is used mainly of the AI-92 brand. As oil, you need to use only a special two-stroke, but not a motor or even working off.

The prepared fuel mixture cannot be stored for more than 2 weeks, as the mixture begins to lose its properties, which negatively affects not only the operation of the engine, but also its starting. How does a poor-quality mixture affect engine starting, you ask? Everything is very simple, with long-term storage of the mixture, the oil precipitates, which leads to clogging of the channels and jets of the carburetor.

The instructions for each brand of chainsaw indicate recommendations on the ratio in which gasoline and oil should be diluted. It is this recommendation that should be followed when preparing a mixture for a two-stroke engine of a chainsaw, otherwise it will significantly reduce the life of your tool.

If the chainsaw won’t start anyway, what to do

The above are the main reasons why the chainsaw does not start. And this applies to tools of different brands Stihl, Husqvarna, Partner, Makita, Champion and others. The Druzhba chainsaws have a different principle of operation, but in general, the search for a malfunction should begin with the ignition system, or rather, inspect the condition of the spark plug electrodes. If the manipulations carried out do not help to obtain the desired result, then it is necessary to resort to more serious actions. This means that you need to do the following:

Check the serviceability of the carburetor and adjust it
Measure the amount of compression of the engine, and then make an appropriate conclusion about its serviceability
Compression in the crankcase is checked

Checking the compression in the cylinder allows you to assess the condition and serviceability of the CPG. To measure compression, you need a compression meter. It is screwed into the spark plug hole, after which the starter handle is pulled. The compressor shows the corresponding cylinder pressure. This value should be at the level of 8-12 atmospheres.

If the pressure is significantly lower, then this is a direct sign of a device malfunction. In case of malfunction, the cylinder-piston group is replaced with a new one. When installing a new CPG, it is necessary to carefully treat all parts with oil so that chips and scuffs do not form at the time the engine is started.

If there is no compression in the crankcase, then the chainsaw will also not start. The reason for the decrease in the pressure in the crankcase is the gasket, or rather its damage. This gasket is located between the cylinder and the crankcase and, to make sure it is working properly, the following manipulations should be performed:

Disconnect the fuel line from the tank
Lower the tube into a container with a prepared mixture of gasoline and oil
Start the chainsaw engine
If the engine starts and fuel is sucked in, then this indicates the serviceability of the gasket.

If the fuel is not sucked in, then you need to replace the crankcase gasket.

Chainsaw Won’t Start 3 Reasons Why

The carburetor is the most important and most difficult part of a chainsaw. If all the above steps did not help to get a positive result, then this indicates that the carburetor is faulty. The main malfunction of the carburetor is the clogging of its channels and jets. Membranes and other elements fail less often. In any case, you will need to disassemble the chainsaw carburetor, clean it and replace the failed parts.

As you can see, there are enough reasons why the chainsaw does not start. To find out what exactly happened in your case, you need to remember the symptoms the day before. Perhaps before the chainsaw stopped starting, engine malfunctions were observed, power and performance decreased, and other breakdowns were also appropriate. Based on these technical symptoms, it is necessary to begin the search. If you do not know where to start, then the diagnosis should be carried out in order, as described in the material.

Checking Spark Plug Spark and Coil-Magneto Gap

The spark plug is the most important part that ignites the fuel mixture entering the cylinder chamber. If the candle has served its purpose, then it will give out a weak spark or not at all. You can check this in the following way:

Unscrew the spark plug
Put it on a cylinder by connecting it to a candlestick
Switch on ignition
Pull the starter handle

If the spark occurs constantly, then this indicates the serviceability of the candle. over, not only the candle is in good order, but also the ignition system. the coil and the high-voltage wire. If a spark occurs on the candle, but intermittently (intermittently), then such a part must be replaced. First you need to check the gap between the contacts. The gap should be between 0.5 and 1 mm.

For each model of the chainsaw, manufacturers indicate the recommended gap size, so you need to use the reference book. You can measure the gap with a special feeler gauge or a sheet of paper folded several times.

The absence of a spark on the spark plug indicates a malfunction of the ignition system, therefore, before replacing a part, you should make sure that the ignition coil and high-voltage wire are in good working order. The chainsaw may not start due to clogged spark plug electrodes. The presence of black carbon on the candle or wet electrodes. all this can indicate the following malfunctions:

Black carbon. the chainsaw carburetor is not adjusted correctly. The mixture entering the cylinder contains a lot of fuel and little air. You can eliminate the malfunction by cleaning the carbon deposits on the spark plug electrodes, followed by adjusting the carburetor
If the candle is wet (it floods), then this may indicate the following. either the ignition system is faulty (including the candle itself), or an excess amount of fuel enters the cylinder, thereby filling the candle. First you need to make sure that the spark plug gives a good spark, and only then adjust the carburetor. It is not recommended to dry a wet candle by calcining, so it should be wiped dry and then allowed to dry in the sun
If the spark plug has red or pink carbon deposits on the electrodes, this indicates that the gasoline used contains a large amount of additives. Typically, this effect is produced by AI-95 and higher gasoline, an increase in the octane number in which is achieved by adding additives

When the candle is brown (brick), this indicates not only a properly adjusted chainsaw carburetor, but also about the health of the ignition system. If a new spark plug is used, which, when checked, produces a weak spark (or there is no spark at all), then this is a sign of a malfunctioning ignition coil. The coil must be replaced together with the high-voltage wire.

Fuel and air filters. checking their serviceability

If the fuel or air filter is clogged, the chainsaw will also not be able to start. First you need to check the serviceability of the air filter, which is located in a plastic case. Chainsaw air filter is very often clogged, therefore it is recommended to clean it before use. You will need to use a compressor for cleaning. If the air filter on the chainsaw is clogged with sawdust and shavings, then the engine will not start hot. Air does not enter the carburetor, so only excess fuel is supplied to the cylinder, which causes the spark plug to flood.

The case of a clogged air filter on a chainsaw is very interesting. If it is clogged, it usually starts up on a cold chainsaw, but as soon as the air damper opens to supply air, the engine immediately stalls after warming up. A hot chainsaw with a clogged filter will not start at all, or it will start and immediately stall. When diagnosing the air filter, you need to pay attention to the damper, through which the air supply is limited. Make sure the flap moves freely when you push the lever to close and open it.

If the damper does not close, then the attempt to start the chainsaw on a cold one is unsuccessful.
A similar situation when the chainsaw is hot. If the engine starts up cold, but stalls when warming up, then this may be due to the fact that the damper is stuck in the closed position

As you can see, not only the start of the chainsaw engine depends on the serviceability of the air filter and the damper, but also its proper operation.

In addition to the air filter, the cleaning element, which is responsible for cleaning the fuel mixture, can also become clogged. This filter is located in the chainsaw tank and prevents small grains of sand from entering the carburetor. Like the air filter, the fuel cleaner also needs to be cleaned. Cleaning is done by replacing the old filter with a new one. The service life of this element depends on various factors, and first of all, on the quality of the gasoline and oil used. If you pour fuel into the tank in windy weather, then the probability of sand grains entering the tank is 100%.

Depending on the model of the chainsaw, the principle of replacing the fuel filter may differ. However, even a beginner can cope with this procedure, since it is not difficult, and only requires adherence to the sequence of actions.

What is a breather and how does it affect the reasons for the inability to start a chainsaw

Few of the sawers know about the existence of such an element on a chainsaw as a breather. This is one of the important parts of the tool, which is responsible for balancing the pressure in the fuel tank. The principle of operation of the breather on a chainsaw is that when the amount of fuel in the tank decreases, a vacuum or vacuum occurs. The less fuel in the tank, the higher the pressure, which becomes an obstacle to the passage of fuel into the carburetor. To reduce the pressure in the tank, a breather is used, which is a valve that allows air to pass in one direction.

If the breather inlet is clogged, then air does not enter the tank, which means that the pressure begins to increase. There is a breather on the fuel tank cap of the chainsaw (depending on the model), and if the two-stroke engine of the tool does not start, it is necessary to check that the breather is working properly. It is quite simple to make sure that the breather is faulty:

Unscrew the fuel tank cap. If air bleeds, then this indirectly indicates a malfunction of the pressure regulator
Screw the gas cap back on, then try to start the engine again. If the engine starts, but after a while it stalls, then the breather needs to be cleaned
Another way to check if the breather is working is to disconnect the fuel hose from the carburetor. If fuel flows out of it intermittently, then the device is working properly. If the trickle is weak and intermittent, then you need to clean the breather on the chainsaw to start the engine.

The breather (fuel tank cap valve) is cleaned with a needle. If the breather is heavily clogged, you will need to remove the filter element and clean it. On different models of chainsaws, the location of the breather is different (on most models it is located in the gas tank cap). The video below shows the process of cleaning the breather using the example of a Husqvarna chainsaw.

The main reasons why the chainsaw won’t start

When the chainsaw does not start, the search for the cause should begin with diagnostic procedures. To carry out them, it is not at all necessary to understand the device of the gasoline tool, and it is enough to follow the sequence of actions. Common reasons why your chainsaw won’t start are:

Fuel line malfunction. From the tank, fuel in the form of gasoline with oil enters the carburetor through the fuel line. The carburetor membrane, which acts as a pump, is responsible for its transportation. If there is no fuel in the tank, then naturally the chainsaw will not start, so the first thing to do is make sure that there is fuel in the gas tank.
Ignition system. most often, the chainsaw engine does not start, the spark plug is to blame. This is due to the fact that it has a certain resource, and if the tool is used often and for a long time, then the candle fails. After making sure that there is fuel in the tank, you need to check the condition of the spark plug
The filter elements are fuel and air cleaners that prevent fine grains of sand from entering the carburetor and cylinder. The fuel filter cleans the fuel, and it is located on the fuel supply line in the gas tank. The air cleaner is located on the carburetor, and limits the ingress of shavings and sawdust into the carburetor
The breather or pressure equalizer is the smallest element and is often the main reason a chainsaw won’t start. The main symptom of a breather malfunction is when the engine stalls during operation
Muffler or exhaust channel. during the operation of the tool, carbon deposits settle on the walls of the exhaust system. As a result, the exhaust gases have nowhere to go, and therefore the chainsaw does not start, and if it starts, it immediately stalls
The carburetor is already a more serious malfunction, which can be eliminated by cleaning the device responsible for mixing fuel with air and supplying the finished mixture to the cylinder. Plugging of the channels and jets of the carburetor leads to the fact that the engine will not start
The CPG is the most extreme reason why the chainsaw won’t start. The compression gauge will help to make sure of the wear of the cylinder-piston group. Having measured the compression of the chainsaw, you can draw an appropriate conclusion about the health of the engine itself

These are all the components that need to be checked in order to find and eliminate the cause of the inability to start the engine of the chainsaw. In more detail, each type of malfunction, as well as ways to eliminate them, will be considered below.

Chinese and new chainsaw won’t start what could be

The popularity of Chinese chainsaws has no boundaries. This is due to their main advantage. affordable cost. At the same time, often among the owners of Chinese chainsaws, questions arise about the problem of starting the engine of the tool. Before you find out why the Chinese chainsaw does not start, one feature should be noted. the design of these tools is no different from Russian, German and other manufacturers. That is why the reason why the chainsaw does not start can be found based on the above algorithm.

Chinese chainsaws are very sensitive to fuel quality, therefore, in the diagnostic algorithm, checking the fuel quality is in the first place. The use of low-quality fuel leads to the fact that the tool does not work at full power, its service life is reduced, and also there are difficulties with starting. The instructions for the tool indicate the recommended type of gasoline and oil, which are important to use in order for the Chinese chainsaw to work for a long time and at full power.

Fuel

The most commonplace and at the same time quite common problem with the launch can arise due to the usual carelessness. If the fuel level in the chainsaw tank is low, the fuel hose with a filter cannot be completely immersed in it and pumped over. Especially often this situation happens when the chainsaw does not start hot, after a short break. Although even after cooling down, without the required amount of fuel, the engine will no longer start.

To exclude such a variant of events from the list of possible problems with starting the engine, it is enough to monitor the fuel level in the tank and regularly fill it with a high-quality mixture.

Optimum fuel performance may vary depending on the model of your particular chain saw. The ratio of oil to gasoline can be from 1 to 25 to 1 to 50. The permissible octane rating of gasoline can be 80, 92 or 95 (usually 92). Many manufacturers recommend the use of specific grades of oils, whose composition is ideal for interaction with the alloy from which the engine and carburetor are made.

Fuel system

serious malfunctions remain damage to the carburetor diaphragm pump. This option should be considered only after checking the previous ones. In this case, it is recommended for experienced users to carry out self-repairs (the process is described below). If the design of the mechanism is not familiar, it is better to contact the service.

The opposite problem to a complete lack of fuel supply may be associated with an excess of fuel. The carburetor can feed too much mixture into the combustion chamber by filling the spark plug. You can verify the malfunction by unscrewing the candle and turning the chainsaw upside down (if the candle is installed on top). If fuel leaks out of the hole, the carburetor needs adjustment. You can try to fix the problem yourself by tightening the adjusting screws H and L. A more detailed analysis of the problem is presented in the following video.

Carburetor

The second most important structural element of the chainsaw, which ensures the supply of an air-fuel mixture to the combustion chamber. If the chainsaw does not start on a cold one and the cause of the carburetor problems, this is usually due to damage to the membrane that pumps the fuel. Of course, the malfunctions of such an accurate and even jewelry device are not limited to one pump and can come from the nozzle, adjusting screws and banal clogging of holes.

Since the carburetor is not of the simplest design, it is necessary to remove, and even more so to disassemble the device with utmost care and accuracy. Of course, it is better to hand over the defective device to a specialist, but you can actually do some work yourself. The nuances of removing the carburetor from the system, visual inspection and replacing the membrane are set out below.

Depending on the model of the chainsaw, the attachment points of the element may differ, and in addition to the fixing screws, it must be disconnected from other components. Before removing the carburetor, it is necessary to disconnect the throttle lever and gas traction from it. Next, the screws / nuts are unscrewed, which can be located on different sides of the case. After removing all fasteners, it remains to disconnect 2 fuel hoses and the carburetor can be removed.

Exhaust system

As the engine runs, the fuel burned in the cylinder forms exhaust gases, some of which settle inside the resonator, spark arrestor and muffler. The carbon layer gradually increases, filling the internal space and reducing the throughput of the channel for the removal of the spent body. Insufficient exhaust or complete stagnation of exhaust gases in the cylinder impedes the flow of fresh air, as a result of which the engine reduces power or stops working.

Reasons why the chainsaw won’t start

Among the malfunctions responsible for starting the mechanism, one can distinguish simple. when restoration does not require specific knowledge, and complex. when an engine or carburetor requires repair. Solving simple problems, in 90% of cases, comes down to cleaning or replacing easily accessible components. complex breakdowns may require almost complete disassembly of key system components, followed by replacement of damaged elements.

If the tool has been used with care and according to the manufacturer’s requirements, there is a high probability of a slight malfunction. A banal lack of fuel in the tank, a violation of the sequence of actions at start, the absence of a spark, clogged filters and breather and similar problems, due to which the chainsaw usually does not start. The reasons and nuances of the solution are summarized in the following list (further in more detail):

Lack of fuel may seem to be the most obvious reason for a launch failure, but cases of contacting the service about this occasionally happen. It seems like enough gasoline is splashing in the tank, but the filter on the fuel hose does not allow the carburetor to pull it in from almost the bottom. In this case, you should simply fill the tool at least half.

The correct sequence of actions before starting, greatly facilitates the starting procedure. Violation of the algorithm can not only complicate the launch, but also make it completely impossible. The process should be as follows: 3-4 presses on the primer to supply fuel to the carburetor, closing the air damper (lever towards you) and several confident rotations of the starter until the chainsaw starts for a split second, after which it stalls. Next, it remains to open the air damper, start and you can use.

The lack of spark could be due to a faulty spark plug or ignition system. The candle can be dirty or deformed, which can be solved by cleaning, easy repair or replacement. The problem with the ignition system may be associated with an incorrect gap between the flywheel and the coil, the gap between which should not exceed 0.35 mm. If the adjustment does not help, the system should be replaced.

Clogged filters (air and fuel) restrict the supply of substances vital to the engine, making it impossible to start or reducing its efficiency. On a new saw, this problem will not exist, and these elements should be checked after prolonged use. The fuel filter is attached to the hose in the tank, and the air filter is attached to the carburetor.

The fuel tank breather is designed to stabilize the pressure by supplying the required volume of air, instead of the decreasing volume of gasoline. When the breather becomes clogged, the gas tank will become sealed and pumping out the gasoline will create a vacuum in it. When the pressure threshold is reached, the carburetor will not be able to suck in fuel and supply it to the cylinder. If, when unscrewing the tank cap, air is abruptly sucked into it, then the breather is clogged and requires cleaning.

Carbon deposits on the exhaust valve or muffler can impede the removal of exhaust gases generated by engine operation. In this case, the chainsaw may stall immediately after starting, or not start at all. The problem arises after prolonged use of the instrument and is solved by cleaning the channels.

serious damage is associated with the carburetor and engine. Repairing these elements requires some experience, and a person with minimal knowledge of the operation of an internal combustion engine should not take it on. You can independently adjust the carburetor, check the compression and replace the membrane (more on this below), but it is better to entrust the complete replacement of the CPG to a specialist.

Details for each malfunction

Having considered the main problem areas and having determined the area of recovery work, you can proceed to a more detailed analysis of each cause separately. The instructions below follow as the set-up complexity increases. The most banal, simple options require a minimum of time and a regular set of tools for servicing a chainsaw. For more serious damage, a set of socket wrenches and a compression gauge may be required (to check the engine).

Ignition

Perhaps the most popular problem with starting a chainsaw is the lack of a spark to ignite the fuel. Such a malfunction may be associated with contamination or damage to the spark plug, high-voltage wire, contacts or generator (flywheel and magneto). The most accessible and easy-to-diagnose element is a candle, so the check should start with it.

The first step is to gain access to the potential source of damage. On most chainsaws, the spark plug is located on top, near the carburetor, but there are models where this element is below.

Using a special hex head (included with the saw), the candle is unscrewed from the socket, after which it is visually inspected. Contacts must be clean and dry. If carbon deposits are present on the spark plug, then the fuel-to-air ratio in the combustion block is higher than normal and the carburetor needs adjustment. The presence of a fuel mixture on the contacts indicates an excessive supply of fuel, which can also be adjusted with a special screw on the carburetor. The first thing to do in this situation is to check the performance of the candle.

Before checking, remove carbon deposits (if any) and dry the element completely. You should also check the gap between the spark plug contacts, which should not exceed 1 mm (ideally 0.7 mm). Next, it remains to connect the candle to the high-voltage wire (candlestick) coming from the generator and pull the starter. The presence of a spark will indicate that the ignition system is in good working order and the need for further adjustment of the carburetor.

If the chainsaw does not start, the plug is dry, but there is no spark, the breakdown should be looked for in the ignition system itself. Usually, the lack of momentum when rotating the shaft is due to the displacement of the magneto in relation to the flywheel. On average, the optimal distance between the above elements should be 0.25 mm (4-5 notebook sheets). To gain access to the magneto, you must unscrew the side case cover. To adjust, it is enough to loosen the fixing bolts of the magneto, lay sheets of paper between it and the flywheel, press and tighten.

If the gap calibration does not give a result, you should check (visually / by ringing) the high voltage wire going to the candlestick. In the presence of confident contact, the area of malfunction is narrowed down to one detail. magneto. It should be replaced or contact a service for repair.

Plant device

The first and almost basic element of the chainsaw is the engine, namely the carburetor two-stroke (see carburetor adjustment). Its immediate power is varied, it all depends on the model of the device and its direct purpose. For example, the power of the Ural chainsaw is 3.68 kW.

The second no less important part of the tool is the headset (saw), which consists of a chain (cutting), a tire, a sprocket, a wheel (chain). It should be added to this that completely different manufacturers provide their own specific range of this headset.

It is important that it always needs to be matched directly to the specific characteristic data of the engine. Since the larger the pitch of this kind of headset, the deeper the cut of the chainsaw will be, one might even say that the more powerful and productive it will be. But do not forget that for the full operation of the device, the engine should also not be inferior to it in power.

It is lubricated by means of a special oil directly from the second tank, which is located on the hand unit. It is worth noting that the mass of this kind of tank has such features that the oil and fuel intended for the engine run out at the same time.

We figured out the general outlines of the device, and most likely with its basis, and now it’s time to start figuring out why the chainsaw stopped working, what reasons might exist, and how to fix them.

Warranty return and post-warranty service

Those owners of the chainsaw who only received a new tool in the morning, unpacked it and assembled it in accordance with the instructions, but could not start it, or the engine starts up and immediately stalls, are especially distressed. We warn you right away. in no case try to disassemble a new engine and do not tear off the warranty stickers. Under such circumstances, it is best to exchange a faulty chainsaw for another, or request a warranty repair.

Chainsaw standard equipment

In accordance with the legislation of most CIS countries (including Russia and Ukraine), electric and chainsaws are subject to return, in the event of any malfunctions not specified by the seller’s side.

When buying a chainsaw, ask the seller what warranty period the manufacturer offers. In most cases, it is indicated in the interval from 1 year to 36 months of tool operation.

What to do if the chainsaw won’t start further?

If the initial inspection did not give anything or the defects were eliminated during the search, and the chainsaw does not start further, then you need to look for more serious reasons. It is best to identify and eliminate such breakdowns in a service center. However, with experience, you can find and eliminate them yourself. What to diagnose and check?

Compression in the cylinder;
Compression in the crankcase;
Carburetor operation.

In the first case, checking the compression in the cylinder will allow you to find out the state of the cylinder-piston group (CPG) of a chainsaw that does not want to start cold. For this you need a compressometer. The device is screwed into place of the spark plug and the engine is idle. Measurement of readings allows you to judge the state of the CPG. In the absence of a compression gauge, the compression in the cylinder can be determined offhand as follows:

Place your finger on the candle hole;
Try to start the chainsaw engine.

By placing your finger on the spark plug hole and pulling the starter, you can check the compression in the cylinder.

If you feel that your finger is pulling strongly into the candle channel, then everything is in order with the compression. The absence of vacuum in the chamber indicates a malfunction. The cylinder-piston group needs a more detailed inspection, which will give an idea of the condition of the piston and cylinder, piston rings and bearings.

The chainsaw may not start on a cold one due to the lack of compression in the engine crankcase. The main reason for this is damage to the gasket placed between the cylinder and the crankcase. It is quite easy to detect the lack of compression:

Top Reasons Chainsaw Won’t Start — Chainsaw Troubleshooting

Disconnect the upper tube from the carburetor;
Pour gasoline into a regular cork;
We immerse the removed tube in the fuel;
We pull the starter several times.

If the fuel is sucked from the cap when starting the chainsaw starter, then everything is in order with the compression. If not, see the gasket.

If the fuel is drawn in, then everything is in order. the gasket is intact. Otherwise, you will have to purchase a repair kit and replace it. How to do this watch the video, why the Chinese chainsaw does not start:

Starting the tool can be complicated by improper operation of the carburetor or its breakage. It often happens that during the sawing process, the fastening screws are loosened and air is sucked into the cylinder. Check that the carburetor is securely fastened. Inspect it for fuel leaks. There can be a lot of reasons for the malfunction. It is possible to pinpoint the malfunction, eliminate it and fine-tune the carburetor only in a service center.

After going through the step-by-step troubleshooting of the chainsaw engine, you can find the malfunction, fix it yourself and successfully start your working tool. Do not take on jobs that you are not sure about. Entrust the troubleshooting to specialists from the service center.

Causes

In general, there should be no problems with new equipment, since all its parts and elements are in perfect factory condition and have not been operated by anyone before you.

The first and foremost cause of a startup problem is that you are not following the operating instructions. If the instructions are followed, the problem may lie in the oil-gasoline mixture that you prepared in the wrong proportions. The third reason why you cannot start a new tool is a technical malfunction or a manufacturing defect.

, how to install and sharpen a chainsaw chain, as well as how to choose the right sharpening machine

New chainsaw won’t start

When you buy a new tool, you count on its quality. Unfortunately, not every implement meets the job requirements.

Important! Saving on fuel materials will lead to serious losses in the repair of the piston group. Buy only high-quality fuel and oil, which is specified in the instruction manual, to avoid damage.

Checking Spark Plug Spark and Coil-Magneto Gap

Unscrew the spark plug
Put it on a cylinder by connecting it to a candlestick
Switch on ignition
Pull the starter handle

The absence of a spark on the spark plug indicates a malfunction of the ignition system, therefore, before replacing a part, you should make sure that the ignition coil and high-voltage wire are in good working order. The chainsaw may not start due to clogged spark plug electrodes. The presence of black carbon on the candle or wet electrodes. all this can indicate the following malfunctions:

Black carbon. the chainsaw carburetor is not adjusted correctly. The mixture entering the cylinder contains a lot of fuel and little air. You can eliminate the malfunction by cleaning the carbon deposits on the spark plug electrodes, followed by adjusting the carburetor
If the candle is wet (it floods), then this may indicate the following. either the ignition system is faulty (including the candle itself), or an excess amount of fuel enters the cylinder, thereby filling the candle. First you need to make sure that the spark plug gives a good spark, and only then adjust the carburetor. It is not recommended to dry a wet candle by calcining, so it should be wiped dry and then allowed to dry in the sun
If the spark plug has red or pink carbon deposits on the electrodes, this indicates that the gasoline used contains a large amount of additives. Typically, this effect is produced by AI-95 and higher gasoline, an increase in the octane number in which is achieved by adding additives

It is interesting! It is necessary to check the size of the gap between the ignition coil and the magnet. Different manufacturers of chainsaws indicate the recommended gap size (usually the value is 0.25 mm), if this value is higher than the norm, then it should be corrected using a feeler gauge.

Chainsaw won’t start. reasons and solutions

One of the most unpleasant phenomena is when I was going to cut a tree, and the chainsaw would not start. Many people are faced with this phenomenon, and not only the owners of cheap Chinese chainsaws, but also branded professional tools. If you are faced with a situation where the chainsaw engine does not start, then do not rush to take the tool in for repair. Simple preventive actions will help you quickly restore tool performance. The procedure for carrying out preventive measures to restore the performance of the gasoline unit is described in the material.

Failure detection technologies

There are full-fledged algorithms for finding the most typical failures and malfunctions developed in the process of many years of use. Cranking troubleshooting prescribes a specific sequence for checking the fuel system and ignition. What to do first?

Possible Causes of Problematic Startup

In most cases, there is:

unqualified tuning of the fuel system;
malfunctioning ignition;
dirty air intake filters.

Most often, a chainsaw does not start on a cold one or does not start well after long-term storage, refueling with substandard fuel, a large gap in the spark plug electrodes.

In the private sector, the peak of operational failures occurs after winter and in late autumn, after the completion of intensive work on the harvesting and sawing of fuelwood.

Flushing the carburetor and checking the condition of the jets

If, in the process of the work performed, a stable start is not established, we are looking for a malfunction in the carburetor. In the absence of proper experience, disassembly should be entrusted to an experienced specialist.

The reason for the difficult start may be, in addition to the previously mentioned air leak:

contamination of the jets;
water ingress into the float chamber and depressurization of the float itself;
loose fit of the float valve that stabilizes the fuel level in the carburetor;
refueling the fuel system with a fuel surrogate, or an expired mixture.

Serious malfunctions blocking the standard start, such as air leakage through worn out gland seals of the crankshaft shanks, a change in the ignition angle, due to the lack of appropriate tools and technological equipment, are eliminated in the conditions of repair shops.

Mechanical seizure of the piston or crank mechanism

This malfunction occurs due to the sticking of the piston in the cylinder or the destruction of the crankshaft bearing. This happens when the engine overheats or if it runs on clean gasoline for a long time.

In the first case, it is recommended to cool the power unit, then pour a few drops of engine oil into the spark plug hole. In most cases, the engine can be wedged, but the consequence of this incident may be the appearance of scoring on the piston. The tack is not reflected on the chrome-plated surface of the cylinder mirror.

If the measures taken did not give the proper result, the saw must be repaired in a specialized workshop.

Consequences of operating on a rich and lean mixture

Due to the operation of the engine on an over-enriched mixture, a layer of conductive carbon is formed on the insulator of the central electrode, which can cause interruptions in sparking.
A white or gray color of the center electrode insulator indicates high temperature combustion in a lean mixture. Both options negatively affect the traction performance and durability of the powertrain.
Setting the carburetor to a lean mixture can cause the phenomenon when the chainsaw does not start hot, in another version it grabs, but does not start.

Confirmation of the normal, in a ratio of 16: 1, quality of the air-fuel mixture is the brown color of the insulator and the absence of traces of carbon deposits.

Limitations in self-debugging of the warranty tool

Even in the presence of an easy start system, new equipment that has not been run in is relatively tight. It is not recommended to disassemble the recoil starter before the end of the warranty and repair period.

For service departments, such a revision may become an excuse for refusing a free replacement of more valuable equipment that has failed.
In case of self-elimination of minor deficiencies, such as “no gasoline is supplied” or “the fastening of the air intake is weakened”, penalties are not applied.
Practice shows that problems with the launch of budget range chainsaws appear after 2-3 years of operation. In such a situation, the owner has to put up with additional repair costs or rely on their own locksmith skills.

Due to the higher quality of materials and factory assembly, branded models have an order of magnitude less launch problems. Nevertheless, the recommendations given in this article may be useful for owners of medium and high-end chainsaws.

The information received will tell you the direction of solving the problem when the Chinese chainsaw does not start. Almost all Chinese chainsaw imports are developed on the basis of European models, therefore, structural and operational differences are insignificant.

Why the chainsaw is bad or does not start: reasons and solutions from the masters

Almost all power drives of chainsaw technology produced in recent years are equipped with easy start and electronic ignition systems, decompressors and booster pumps. When asked why the chainsaw does not start with such a rich equipment, service specialists do not give an unambiguous answer.

Depending on the class and purpose, carburetor power units of similar design are installed on household and professional models, running on high-octane motor gasoline with a small admixture of engine oil for two-stroke engines.

The working volume of chainsaw engines varies from 26 to 60 cm3, the power ranges from 1 to 6-plus hp. A characteristic feature of chainsaw drives is maximum compactness, convenient maintenance, and access to setting points. The standard resource of budget models is 1500 hours, branded. more than 2000.

Sources:

http://instrumentoria.ru/149-ne-zavoditsja-benzopila.html
http://tpspribor.ru/instrumenty/poisk-prichin-pochemu-ne-zavoditsya-benzopila.html
http://opilah.com/pochemu-ne-zavoditsya-benzopila/

Chainsaws chainsaw, reasons, start