What should be the spark on a chainsaw

Chainsaws

What an ideal wife should be

To our question: “What should be a woman to marry her?” agreed to answer the most desirable, beautiful and intelligent bachelors, who, by the way, shared their contacts. If you have found a nice man and agree with his opinion about what a wife should be, then feel free to write to him by mail. Who knows, maybe it will become for you the very stone wall behind which you can hide?

What men say about the ideal wife

“It is very important for me to be comfortable and cozy with a woman. Plus, mutual trust in a relationship plays a huge role. Of course, to this you can add care, attention and thrift, because She is my best friend, my advisor and my mentor. I think these are the determining factors that will make me think about a joint future. With my beloved, I want to remain what I am. without masks and reincarnations. And appearance is a completely different question, here it is impossible “pick up” my companion, because everything depends on my attitude towards her “.

“The biggest revelation in a man’s life is the realization that a woman is not a trophy to be won back from others. A woman is an independent and self-sufficient nature. Therefore, it is very important for me to sincerely enjoy the company of my chosen one. In my opinion, in a union, a woman should always walk next to a man, and not in any way behind or in front of him. Although, of course, there are cases when a woman should still take a step back in order to let her man solve problems on his own. There are never any contradictions in love. love is or is not ”.

“What should be an ideal wife? I will marry with my eyes closed the one who will share the following statement: a woman is a support in a man’s life, accepting his life values. For me, this is, first of all, a beautiful and self-sufficient woman who is ready to care, love and respect. Without a doubt, great sex and delicious food play an important role. well, how could it be otherwise. I would like to see a woman near me who has a favorite business, a hobby, who knows how to correctly distribute her time and money. And in the future. and a good mother of our children. I think it is such a woman who does not indulge in despondency, because there are so many pleasures and joy in life. Yes, you can do anything for her! “

“In my opinion, everything is very simple. A woman should have a beautiful face, a sexy figure, intelligent, kind, gentle and understanding. But I have not yet come across a combination of such qualities. “.

“There are no ideal men and women, but a couple can be close if the cockroaches in the heads of lovers coincide by 70-80%. As for the personal qualities of the future wife, most of all I value loyalty and the ability to create such an atmosphere at home that I would like to return there. And I believe that the compatibility of people is not some kind of fiction. Therefore, if there is some kind of creative crisis in the relationship, but the couple retains their desire and gives each other sexual pleasure, then all is not lost. In addition, there is an important point that lovers often forget about. It happens that passions subside, so it is better to be prepared for anything. For example, I will definitely sign a contract. as a kind of written confirmation of agreements “on the shore””.

Why pouring a candle on a chainsaw and what to do

One of the most common problems with chainsaws is candle flooding. At the same time, such situations are typical for various types of saws and it does not matter whether a beginner or a professional holds the tool in his hands. Of course, this should not be, because a spark cannot appear on a wet candle, therefore, the fuel mixture will not ignite.

  • Why is pouring a candle on a chainsaw: reasons
  • What to do when pouring a candle on a chainsaw
  • Low-quality fuel
  • Wrong start
  • Clogged filter
  • Ignition system failure
  • Wrong clearance
  • Ignition coil problem
  • Failure to adjust the carburetor
  • What to do if a candle is flooded on a chainsaw
  • Troubleshooting tips

Ignition system failure

Perhaps this is one of the most difficult problems that will need to be overcome for the further use of the chainsaw. There can also be several reasons for the appearance of a malfunction.

What to do if a candle is flooded on a chainsaw

If you suspect a flooded candle, you must inspect it. With the help of a candle wrench, it is unscrewed and carefully examined. If the candle is wet, but there is a spark, then it was definitely flooded.

Many experienced owners are able to determine the current state of a candle with a high degree of probability by its color. This procedure is recommended to be carried out regularly.

  • Light brown carbon deposits are exactly what all owners want to see. In this case, the functionality of the chainsaw is not impaired.
  • Black carbon deposits indicate an imbalanced mixture, namely a lack of oxygen in the fuel chamber. If the situation does not improve, there is a high probability of re-filling the chainsaw plug.
  • If corrosion is detected on the plug or the distance between the electrodes is too large, then most likely a lean mixture is used.

Clogged filter

Due to the heavy contamination of the paper filter of the chainsaw, sufficient oxygen does not enter the fuel chamber. The fuel mixture has no time to ignite and gasoline fills the spark plug. If the filter has already exhausted its resource (this will be noticeable by its appearance), then it must be replaced. If you don’t have a new filter at hand, but you still need to work, then you can try to blow the filter with a reverse air flow.

Chainsaws from different brands and models differ from each other. To clean or change the filter, it will be superfluous to first look at the instruction manual. Well, or look there if you cannot remove the filter without prompts.

What to do when pouring a candle on a chainsaw

Before heading to the service center, it will be useful to try to fix the current malfunction of filling the spark plug on the chainsaw on your own. Of course, this is only relevant in the presence of “straight” hands, since, otherwise, there is a high probability of increasing the cost of repair work.

Wrong clearance

For the most part, the gap on the chainsaw spark plug should be within 0.5. 1.2 millimeters (more accurate data should be reflected in the user manual). In order to check whether this is so, you must perform the following steps:

  • Using a screwdriver or special keys, unscrew the bolts that fix the chainsaw cover.
  • Having gained access to the flywheel and magnetic circuit, the clearance level is checked.
  • If it does not correspond to the characteristics declared by the manufacturers, then using a special gasket or improvised means (a regular A4 sheet folded several times is perfect), the required distance is set.

Low-quality fuel

The chemical composition of low-octane gasoline includes various alcohol components. For their complete combustion, it takes more time than when using high-quality fuel, respectively, this becomes the main reason for the failure of the chainsaw plug.

Unfortunately, many citizens naively believe that fuel with the inclusion of alcohol has a positive effect on gasoline consumption and purchase fuel surrogates. In a number of cases, efficiency really takes place, however, such fuel negatively affects the chainsaw engine, shortening its service life.

Troubleshooting Algorithm

In all other cases, the search for ignition faults begins from the end and in order. Check the spark after each step.

  • Change the old candle for a guaranteed working one.
  • If the model has a removable candle cap, it is removed, the bare candle wire is shorted to ground with a gap, approximately like a candle. Pull on the starter. If there is a spark, the problem is in the cap. It is eliminated.
  • Change the spark plug wire where it is possible to dismantle it from the source.
  • Visually inspect the wires from the switch. Vibration, in case of contact with metal, can damage them. If there are places of friction, the wire is changed, even if there is no external damage to the insulation. You can use a tester or multimeter to check the wire.

This is where minor and easily fixable problems end. If the problem is not resolved, then the cause is more serious.

Modern coils and ignition systems on most chainsaws are very reliable. They are designed to last even longer than the entire chainsaw. They do not have mechanical moving parts like the old cam systems. They are sufficiently insulated from clogging and moisture.

If, due to an accidental factory defect, an interturn short circuit occurs in the coil or the electronics fail, these parts cannot be repaired. Replacement with new ones will be required.

There is not an uncommon breakdown of mechanical properties. Due to wear or destruction of the crankshaft bearing, play appears on it. And then the magnetic rotor begins to touch the housing of the ignition system, inside which it rotates. This is a serious breakdown. You will need to “halve” (disassemble) the entire engine, replace the bearing, and put everything in place.

What to do?

It is important that the spark on the chainsaw may not be due to a malfunction of the fuel system. In order not to look for a problem in a working ignition, this issue must be dealt with immediately.

The carburetor of the chainsaw can “overflow”, that is, throw too much fuel into the combustion chamber. Inside the candle there is a porcelain insulator from which a metal core emerges. On it, under the plate, they contact the “mass” (minus) and a spark arises. We also recommend reading an article about setting up a carburetor on a chainsaw with your own hands. If a gasoline saw starts and stalls, read here. If it does not start at all, then here.

If the space inside the plug between the round insulator and the ground is filled with excess fuel, especially together with conductive pollution, a short (spark) can slip inside the plug. There will be no spark where it is needed.

However, if there is no spark on the chainsaw, the fuel does not burn, and the spark plug must simply be wet with fuel when the carburetor is running. It is almost impossible to determine visually whether the candle is overly flooded and therefore there is no spark, or not excessively. Therefore, for an accurate diagnosis of this “nodal moment” (the carburetor or ignition is faulty), you need to have 2-3 guaranteed working candles.

  • A working candle is put.
  • Spark is tested.

If there is a spark, it means one of two things:

  • the old candle was defective;
  • the old spark plug is working, but it was filled with fuel.

The working candle is screwed into place, the engine is tried to start. If it started working normally, the problem has been resolved. If not, turn the candle inside out again and watch the spark. There is no spark. put the next dry working candle.

Chainsaw with weak spark

There is a spark, they put the candle in place, try to start it. If it does not start again, turn the candle inside out, watch the spark. If the spark on the chainsaw disappears again, and the spark plug is flooded, there is almost a 100% chance that the cause is fuel overflow. If you are faced with such a situation, then we recommend reading the article, which describes in detail for what reasons he pours a candle on a chainsaw and what to do.

Reasons for the absence of a spark

The engine of each chainsaw is, in fact, a miniature power plant. She receives the primary impulse for the spark on the candle from the pull of the starter cord, from muscle energy.

Further, energy is generated due to the rotation of the magnetic rotor when the engine is running due to the combustion of fuel.

For reference! In theory, spark problems can be found throughout the entire mowing line of a system, from generating power to transferring it through wires and converting it to a spark on the chainsaw‘s spark plug. In practice, there are fewer weak points.

How to make sure there is really no spark?

To make sure there is a spark on the chainsaw or not, you need to follow a simple procedure:

  • Removing the top cover on the case.
  • Carefully, with a grip at the very bottom, so as not to tear off the candle wire, the cap is removed from the candle.
  • With a 19 socket wrench included in the kit, the candle is unscrewed counterclockwise.
  • The cap is put on in place, on the candle.
  • The thread or nut of the candle is “shorted to ground”, that is, pressed against the metal cylinder head.

To ensure reliable contact, the candle is pressed against the cylinder with electric pliers, a screwdriver with insulated handles, or with a hand with dielectric gloves. You should not do this with your bare hand. If the cap breaks down, you can get a painful shock from a high-voltage discharge (up to 40,000 V at a low current strength of up to 80 milliamperes).

Place the chainsaw on the ground, press it with your foot on the ground, and lightly pull on the starter cord. At this time, it will be seen whether there is a spark or not.

Weak spark reasons

A weak spark on a chainsaw is a relative concept. Most often, a spark is either present and the ignition is working properly, or it is not there at all. In modern chainsaws with electronic ignition, the spark visually seems to be weak.

On older models with a mechanical cam interrupter, the spark was large, with a strong blue color. On modern models with electronics, it is noticeably smaller and paler, more often yellowish. Therefore, when you need to make sure of its presence, it is better to do it in the shade. In direct sunlight, it is almost invisible.

A spark plug malfunction is not uncommon, but chainsaw owners also face other malfunctions, read an overview of the most common ones in this article.

Why there is no spark on a chainsaw and what to do

If there is no spark on the chainsaw, then you should not be upset, the malfunction is diagnosed and eliminated on its own very simply. The correctness of the ignition system and the fuel system are equally important for the trouble-free operation of the chainsaw engine.

The symptoms of both ignition and carburetor malfunctions are often very similar at first glance. To correctly find and eliminate the cause in the ignition system, in particular the absence of a spark, you need to know the principle of its operation, device and diagnostics.

  • Reasons for the absence of a spark
  • Weak spark reasons
  • How to make sure there is really no spark?
  • What to do?
  • Troubleshooting Algorithm
  • Troubleshooting Tips

Troubleshooting Tips

Overflowing fuel and filling the chainsaw candle can be one-time and accidental. For example, “overshooting” with a pump cap (primer): the engine did not start immediately, the operator presses the cap again and again with his finger, tries to start, pumps up again.

In this case, the cause is not at all in the carburetor. It is necessary to unscrew the spark plug and blow out the combustion chamber by pulling the starter cord several times, as when starting. Wipe the candle, dry it on a gas burner or burner flame, or use another. They check the spark, put the candle in place. Try to start without sucking first.

If it does not start after 3-4 jerks, press the pump cap 2-3 times. Try again. That is, after the overflow, it is better not to pump fuel at first, but to pump it up incrementally. Until the engine starts.

Candles sometimes require their own maintenance and care.

One of the reasons for the absence of a spark in a chainsaw is described in the following video, which also says how to fix a breakdown:

Modern chainsaw ignition systems are quite compact and reliable. You just need to protect them from direct moisture, shock, exposure to extreme temperatures. And then there will be no problem with the lack of spark during launch. Also, knowingly serviceable 1-2 spare candles will not be superfluous.

Troubleshooting Tips

Overfilling and flooding the chainsaw plug can be one-time and accidental. For example, “overshooting” with a pump cap (primer): the engine did not start immediately, the operator presses the cap again and again, tries to start, pumps up again.

In this case, the cause is not at all in the carburetor. It is necessary to unscrew the spark plug and blow out the combustion chamber by pulling the starter cord several times, as when starting. Wipe the candle, dry it on a gas burner or burner flame, or use another. They check the spark, put the candle in place. Try to start without sucking first.

If it does not start after 3-4 jerks, press the pump cap 2-3 times. Try again. That is, after the overflow, it is better not to pump fuel at first, but to pump it up incrementally. Until the engine starts.

Candles sometimes require their own maintenance and care.

One of the reasons for the absence of a spark in a chainsaw is described in the following video, where they also say how to fix a breakdown:

Modern chainsaw ignition systems are quite compact and reliable. You just need to protect them from direct moisture, shock, exposure to extreme temperatures. And then there will be no problem with the lack of spark during launch. Also, knowingly serviceable 1-2 spare candles will not be superfluous.

Every year, the technique is becoming more perfect and smarter, more complex in design and easier to operate. Manufacturers of chainsaws cannot but keep up with the times: special vibration damping systems, easy starting, automatic chain lubrication, toolless chain tension. But whatever additional functions the model is endowed with, it is not immune from malfunctions. For a chainsaw of any price range, the vast majority of breakdowns can be avoided with proper care and use of equipment.

Idling

In situations where the chainsaw stalls at idle, it is required to inspect the condition of the muffler. If the part is dirty, exhaust gases are poorly discharged, the engine cannot continue to work, it stops.

The saw stalls at idle speed and in cases where the carburetor is incorrectly set. For beginners, it is better to entrust the repair to specialists, as there is the possibility of incorrect settings, due to which the tool will not be able to work. A tachometer is required to adjust the carburetor.

Chainsaw output check.

One of the reasons for poor performance of the chainsaw may be a clogged exhaust duct or its muffler. A drop in power is observed in the process of sawing sawn timber and logs. This is most often due to a build-up of tar on the spark plug or muffler, which forms when a poor mixture of gasoline and oil is burned, which interferes with the exhaust fumes.

A clogged resonator can lead to poor starting of the chainsaw.

To eliminate the cause of the poor start of the chainsaw, in this case, the accumulated combustion products can be removed. 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 carbon deposits with detergent;
  • Let them dry completely;
  • Collect everything in reverse order;

Spark plug problem

Spark plug problem is one of the most common causes of chainsaw breakage.!

This is one of the most common reasons an engine stalls when cold. As a rule, its electrodes are covered with a layer of corrosion and carbon deposits, as a result of which there is a decrease in the distance between their ends. and there is no place for a spark to slip in the end.

Samoilov Vladimir Alekseevich

Experienced gardener and a great specialist in gardening technology

Each manufacturer has its own distance between the electrodes, therefore, before inspecting the spark plug, you must carefully study the operating instructions and technical characteristics of the tool.

The reason for the appearance of corrosion and carbon deposits on the electrodes is an uneven fuel supply, which is already a problem with the carburetor, which is solved separately. The spark plug does not have to have carbon deposits. the spark may be absent also for the reason that the fuel completely fills it on a hot one, which also indicates problems with the carburetor.

The candle itself must be removed, dried and checked how the spark passes through it:

  • First of all, remove the wire and unscrew the spark plug.
  • Return the wire end to its original position.
  • Place the spark plug on the cylinder with the skirt.
  • Check for spark by starting with starter.

If there was a spark in this way, then you must immediately go to the problem with the carburetor. If not, then the candle must either be cleaned of rust and carbon deposits, or replaced. It is also possible that the adjustment of the distance between the contacts of the electrodes will help.

Other reasons for the absence of a spark include:

Generator unit malfunction. If the reason is in it, then the problem can only be solved by completely replacing it.

Poor or interrupted contact between spark plug tip and high voltage electrically conductive cradle. Here can be a simple adjustment using a tester.

The final check for spark plug problems can be completed with a series of simple procedures, after which the chainsaw should start:

  • Unscrew the plug and carry out a complete inspection.
  • Clean it from rust and deposits, dry
  • Place the ends of the electrodes at the correct distance.
  • Drain all excess fuel from the tool engine to prevent the ignition compartment from flooding.
  • Put the spark plug back in and try ignition again.

If these procedures helped and the saw began to work, and the chain began to move, then you can work this way for about 5-30 minutes until the candle is flooded again

It is important to understand that this decision is temporary and just indicative. The main problem lies in the carburetor.

With him, the question is ambiguous: in any case, it is necessary to adjust the fuel supply, but how to do this. independently or with the help of a mechanic. you decide.

When setting up the carburetor, it is imperative to use a tachometer, which will allow you to find out with greater accuracy the number of engine revolutions.

Based on them, you can already adjust the mode of its operation by adjusting the tightening of the screws on the carburetor block in several scenarios:

Setting continuous operation at low rpm.

Building the correct fuel supply at maximum speed.

Setting up idle operation.

Samoilov Vladimir Alekseevich

Experienced gardener and a great specialist in gardening technology

It is possible that the carburetor sucks in a lot of air from the outside, which is why the saw at idle starts to behave strangely, and the number of revolutions changes on its own. This is solved by using ordinary gaskets on the carburetor, with which it is necessary to achieve its tightness.

A complete revision of the carburetor is necessary in the event that it was not possible to determine the specific problem, but there is confidence that the cutting off of the saw is associated with this particular part.

The audit is carried out as follows:

  • It is necessary to remove all communications (wires and hoses) from the device;
  • Carry out cleaning and purging. It is better to do this without removing the carburetor;
  • Remove the product and clean it a second time so that no traces of fuel and oil remain inside;
  • Gradually disassemble the device, guided by a drawing in the documentation or independently drawing up a diagram;
  • All channels must be blown out with compressed air, and the parts must be rinsed in an industrial solvent;
  • Allow the parts to dry for at least 2 hours;
  • Assemble the carburetor back, strictly following the instructions in the documents and diagram;
  • Connect back.

What to do if a candle is flooded on a chainsaw

If you suspect a flooded candle, you must inspect it. With the help of a candle wrench, it is unscrewed and carefully examined. If the candle is wet, but there is a spark, then it was definitely flooded.

Many experienced owners are able to determine the current state of a candle with a high degree of probability by its color. This procedure is recommended to be carried out regularly.

  • Light brown carbon deposits are exactly what all owners want to see. In this case, the functionality of the chainsaw is not impaired.
  • Black carbon deposits indicate an imbalanced mixture, namely a lack of oxygen in the fuel chamber. If the situation does not improve, there is a high probability of re-filling the chainsaw plug.
  • If corrosion is detected on the plug or the distance between the electrodes is too large, then most likely a lean mixture is used.

Why there is no spark on a chainsaw and what to do

Saw refueling algorithm

The gasoline / oil mixture is best prepared in a 2.5 liter plastic bottle if you have to refuel the tool frequently. If you need to prepare fuel for just a few fillings, then it is better to use a smaller container. It is definitely recommended to acquire measuring containers, this will allow you to maintain the exact proportions of both liquids. Most oil manufacturers offer such measuring devices.

Initially, fuel is poured into the container, and then oil is added. It is imperative to take into account that there must be enough space in the container to thoroughly mix the fuel mixture.

It is important to know! It is categorically contraindicated to prepare the fuel mixture directly in the tool’s gas tank.

After preparation, it is recommended to store this mixture for no more than 2 weeks. It is recommended to shake the mixture thoroughly with each refueling. If you are not sure that all the fuel will be used up, then it is better not to cook it in large quantities.

Why add oil

At the heart of any chainsaw is a two-stroke internal combustion engine. It is one of the simplest single-cylinder mechanisms and does not have a separate lubrication system. The technology is such that the lubricant must enter the cylinder along with the fuel mixture, settle there, and lubricate the cylinder walls, piston rings, etc. The simplicity of the design of the tool has many advantages, among which the main one is the ability to carry out repair work on the engine and component parts independently.

Diluting gasoline that is poured into the chainsaw is required in order to extend the life of the tool. It is imperative to dilute fuel with chainsaw oil, and if, for some reason, you forgot to do this, then the operation of the tool is absolutely contraindicated.

It is important to know! Chainsaws do not have a special tank for filling oil, which would be used to lubricate the rubbing engine parts, like on cars. This is due to the simplest design of a two-stroke motor. The present tank for oil in chainsaws is designed to lubricate the chain and bar during the operation of the tool.

The proportions of gasoline and oil for chainsaws: features of the preparation of the fuel mixture

The fact that it is forbidden to pour “clean” gasoline into chainsaws is warned by sellers of buyers at the time of purchasing the tool. Many buyers learn about this for the first time, wondering why it is necessary to dilute gasoline with oil. If you neglect this rule, then the consequences for the tool can be simply catastrophic. In most cases, even a major overhaul of the engine will no longer be able to help. In the material, we will find out what the proportions of gasoline and oil should be for refueling a chainsaw, and also what the risk of non-compliance with this rule.

Ratio of oil and gasoline for chainsaws

How much oil to add to gasoline for a chainsaw is indicated, first of all, in the operating instructions for the tool. If you have forgotten what the proportion of oil and gasoline should be, then you can always open the instructions and update your knowledge. If the instructions are lost, then this material will help you. To begin with, it should be noted that there are several options for mixing oil materials with fuel. Choosing any, it is worth noting that the main criterion for each is the correctness of measuring the components. Only the exact observance of the proportion of oil and gasoline will make it possible to achieve the fuel mixture of the required technical qualities.

One of the most common proportions is 1:50. This means that 1 liter of gasoline must be diluted with 20 ml of oil. Such a recipe for preparing a mixture is relevant for tools whose power exceeds 1.5 kW. This option is one of the most popular, so if you have forgotten the exact proportions for your instrument, then you can always focus on the first option.

The second option provides for a ratio of 1:25. Mixing 1 liter of gasoline with 10 ml of oil is recommended by Chinese manufacturers for their tools. For tools whose power does not exceed 1.5 kW, it is recommended to pour oil in the amount of 25 ml per 1 liter of gasoline. Each manufacturer’s chainsaws have their own restrictions, and recommendations for preparing a fuel mixture, which are recommended to be followed. The above are two main options that are universal.

It is important to know! An excessive amount of the oil mixture in the fuel is also negative, since this will lead to a reduction in the engine resource due to increased shock loads on the cylinder and piston, and will also entail the formation of carbon deposits.

Not everyone knows what kind of gasoline to pour into a chainsaw. This is also indicated in the technical documentation for the chainsaw. In modern saw models, it is recommended to pour fuel of a grade not lower than AI-90, that is, AI-92 or AI-95. And it doesn’t matter who the tool manufacturer is, China or Europe. Professionals recommend using AI-92 gasoline, since in Russia the 95th is in most cases produced from 92 by adding additives. If you know for sure that this is really pure 95, then it is better to use it.

Many craftsmen continue to pour gasoline of grades lower than AI-90 into modern models of chainsaws, as it was allowed to do this for outdated models of tools: “Friendship”, “Taiga” and others. This is not recommended.!

What kind of oil to use to lubricate the chainsaw chain depends directly on the model of the tool. Stihl branded saws and the like produce special lubricants that are intended only for use in such tools. Recommended oils can also be found in the technical documentation. When choosing a lubricant, you must pay attention that it is necessarily intended for two-stroke engines. Oils for mixing with gasoline and for lubricating chains differ in composition, quality and purpose. You cannot mix them, as this will accelerate the failure of the instrument. Recommended oil brands for two-stroke engines:

  • Stihl;
  • Kreissman;
  • Husquarna;
  • Sadko.

Risks of using fuel and oil surrogates

To avoid premature failure of the chainsaw, it is recommended to refuel the tool with exclusively high-quality and branded consumables. Finding such materials is not difficult, as they are usually sold in branded retail outlets. The use of low-quality gasoline can lead to engine failure, therefore, it is recommended to buy fuel at such filling stations where high quality fuel is guaranteed.

It is categorically contraindicated to mix gasoline with motor oil for cars, since it is not at all intended for such purposes. Compliance with the number of proportions, as well as the use of high-quality materials will extend the life of your tool for many years.

Chainsaw ignition adjustment

The device and principle of operation of the chainsaw ignition system

The standard ignition system for a carburetor engine consists of:

  • magneto;
  • spark plug;
  • an electrical cable connecting them to each other;
  • engine shutdown keys.

Ignition scheme of the Ural chainsaw

Magneto is a type of alternator that supplies electricity to spark plugs. It consists of a stationary winding of an inductor and a permanent magnet attached to a flywheel that rotates with the crankshaft of a gasoline engine. The moving magnetic field creates an electromotive force in the low-voltage winding, which is converted by the transformer into a voltage with a potential sufficient to generate a spark.

For contact magnets, the first terminal of the high-voltage winding is connected to the spark plug, and the second through a mechanical switch to ground. At a certain moment, a special structural element divides the contacts, which leads to a sharp increase in the voltage in the network and a spark slip in the interelectrode space of the candle.

To prevent overheating and oxidation of the breaker contacts, a capacitor is connected to the electrical circuit.

The ignition circuit of a chainsaw with a contactless magneto is based on the operation of a control coil, which plays the role of a voltage supply regulator. The electronic unit also includes a diode, a capacitor and a thyristor, which transmits a current with a voltage of a certain magnitude. When it is opened, the capacitor is intensively discharged, forming a current in the turns of the primary winding, which is inducted into a high voltage, giving a breakdown on the spark plug installed in the cylinder. The electrical network operates in a pulsed mode in time with the rotation of the crankshaft and the translational movement of the cylinders.

Ignition timing

The mechanical device and the factory setting of the magneto ensure that the discharge time of the spark plug coincides with the optimal position of the moving piston. For four-stroke gasoline engines, spark breakthrough must occur even before the piston reaches top dead center. this is due to the fact that the process of complete ignition of the air-fuel mixture takes a certain time. The speed of movement of engine parts is comparable to the speed of fuel ignition, so the piston has time to travel a certain distance from the moment the spark breaks through to the moment the burning gases create extremely high pressure.

There is an ignition timing for each engine. It is equal to the rotation of the crank, expressed in degrees, from the moment of breakdown in the interelectrode space of the spark plug until the moment when the piston is at top dead center. This indicator depends on many parameters, including the design features of the engine and the properties of the fuel mixture.

In practice, during the mass production of an engine at the factory, individual adjustment of the ignition of each product is not made, but the corresponding marks are set on the rotating parts, which must be aligned during installation.

When is the ignition setting required? There are the main symptoms of a system crash:

  • the engine will not start;
  • the motor works, but with noticeable interruptions;
  • there is a decrease in tool power.

In these cases, you should not rush to contact the service center. Try to adjust the ignition yourself first.

The procedure for checking and adjusting the correct operation of the engine

The most vulnerable element of a carburetor engine is the spark plug. It also allows you to judge the probable causes of malfunction of individual units of a gasoline engine. The following procedure is recommended.

    Dismantle the spark plug and inspect it. A dry candle with a slight brown tint of the electrodes can be considered serviceable.

Spark plug carbon deposits

Chainsaw ignition coil

When installing a new electrical module on the engine, the magneto gap must be adjusted. The optimal distance between the flywheel and the ignition coil is 0.2-0.4 mm for most chainsaws.

Clearance between magneto and flywheel

To be sure, it is recommended to carefully study the documentation for the purchased model and follow the manufacturer’s requirements.

With such a small gap, it will not be possible to use an available measuring tool for direct measurement. In practice, a Husqvarna saw uses a template in the form of a spacer cut from thin, flexible sheet material of the required thickness. It is clamped in the space between the flywheel and the coil when it is installed, and then pulled out.

In order not to have to resort to adjusting the ignition, operate the tool carefully, avoiding knocks. In particular, this applies to chainsaws with electronic chips in the ignition system, since they are very sensitive to mechanical damage.