A chain saw doesn’t start on an open fire.

Why doesn’t the chainsaw start?

Let’s look at each cause in detail.

Fuel and air filter

Dirty main filter elements in a chainsaw have a negative impact on its operation.

For example, a dirty air filter will not provide a full amount of air into the carburetor, which will affect the quality of the fuel-air mixture and normal engine starting. Contamination of the fuel filter, will make it difficult or even block the flow of gasoline to the carburetor and make it impossible to run the engine.

Reduced compression

One of the most common causes of chain saw malfunctions is the wearing of the cylinder block (piston group).

As it is known, to have a normal chain saw’s engine starting, it needs to have compression. It is necessary for the normal compression of the fuel mixture in the engine cylinder, and it also affects the work of the gasoline pump.

When the tool is running, the compression value will drop, and the chainsaw will not start properly.

Reasons for the lack of compression, or its decrease, can be natural, t.к. Engine wear and tear in the course of operation. Also, problems may be caused by serious damage, such as scoring of the cylinder block, or piston ring failure.

A sign of low compression is that the starter does not have enough resistance to start. Because the chainsaw has less compression, it will have less power, which could negatively affect performance. The problem can be solved by replacing the piston rings or the cylinder block.

Adjusting the carburetor

Improper carburetor adjustment will cause the chainsaw not to develop full power. Will not start well or will not start at all. The carburetor setting directly affects the quality of the fuel-air mixture, which is necessary for normal starting and further engine operation.

If the carburetor is not properly adjusted, there will be more or less gasoline in the mixture of fuel and air than required, and the mixture will not ignite even with normal spark formation.

chain, doesn, start, open, fire

Excessive gasoline in the mixture is called overflow. A characteristic sign of overfilling is a wet spark plug, after several fruitless attempts to start the chainsaw.

Spark Plug

The spark plug is one of the main components of the ignition system. On its electrodes, spark formation occurs, and if this element fails, it will be difficult or impossible to start the saw.

The spark plug may fail completely, or work intermittently or give a weak spark. Check the plug is simple enough, you need to unscrew it from the engine, connect it to the cap of the high voltage wire and, putting it on the cylinder, pull the starter. If the spark plug is good, the spark is strong and bluish. Weak spark with a reddish tint, a sign of a problem. A defective spark plug needs to be replaced.

Ignition coil

The cause of the fact that the new chainsaw does not start, or starts poorly, can be the ignition coil. Modern chainsaws, are equipped with electronic ignition coils. It is not repairable, and it is often completely replaced if defective.

Gap between ignition coil and flywheel

Improperly set clearance between the flywheel and the ignition coil contacts affects the quality of the spark formation, which in turn is responsible for a normal start and stable engine operation.

Switching system design

The key role in any chainsaw is played by a carburetor power unit of two-stroke type. Its power depends directly on the chosen model and purpose. The second important mechanical component in the device is the saw part, which consists of the bar, the cutting chain and the chain wheel. The parameters of these components can vary.

Treatment with lubricating compounds is carried out with a special oil, which is poured into a specialized tank, it is located on the hand unit. The volumes of oil and fuel tank are calculated in such a way that their contents are usually depleted at the same time.

What to do and what to do about it

Regardless of the brand of chain saw. Champion, Husqvarna 236 or Patriot. the causes of poor performance are identical. There are lots of different solutions to why a STIHL chain saw does not start, but some of the more common ones are.

Chainsaw does not start well in cold conditions

If the saw does not start in the cold, it means that it has no compression. It is caused by ring wear and tear from continuous use. It turns out that when the user is trying to start the Champion 137 when it is cold, there will not be enough compression to perform this manipulation.

In this case it is not recommended to systematically jerk the knob. In the end, the unit will still start, but it may break other mechanical components. In this situation it is necessary to replace the worn rings with new ones.

The chainsaw does not start on hot

The causes here are the engine flooding and the spark plugs getting wet. Here’s what to do in such a situation:

  • move the air damper to the middle position;
  • Blow out the constituent parts well;
  • Start the machine for 10 seconds;
  • Set the engine to idle;
  • On a Kalibr or other model of chainsaw, to open the choke completely.

Next, simply start the engine while idling, pulling the handle. If the engine is not overheated, it will start with ease.

In case this variant of troubleshooting did not help, it means that the engine has already cooled down a lot. Fix the half throttle according to the recommendations in the manual and repeat the operation.

See also  Cultivator with their own hands from a chainsaw with their own hands

You should also try cranking the cold start screw in the direction of clockwise motion. The higher the rotational speed of the equipment, the easier it is to start. You should know that the chain should remain in a stationary position when idling.

Chainsaw does not start well and shuts down right away

This is usually caused by a mix of gasoline in the spark plugs when the user is trying to start the machine. A small amount of fuel is trapped under the spark plug electrodes, and that is why there is no spark in the equipment.

The problem may be solved by removing the spark plug and drying it thoroughly. In addition to these actions, you can additionally carry out glowing. But this manipulation should only be performed with a gas burner. Otherwise, a small amount of soot may form in the area of the electrodes. After complete drying of the plugs, you need to drain the excess fuel and leave the equipment itself to dry.

The Chinese chainsaw will not start

It should be noted at once that the Chinese machines have no distinctive features from other analogs. They are just as reliable and productive, and cost less. The only thing that is necessary individually for this unit is to use only branded oil and fuel.

Most units do not work well on domestic fuel, gasoline clogs the channels and as a result the fuel does not flow to the engine. Use only high-quality fuel or fuel from the manufacturer of the saw.

Why the new saw does not work

New equipment should not have problems with the wear and tear of functioning mechanical parts, because the model has just come out of the assembly line. This indiscretion may occur in the case of purchase of demonstration equipment, which has been used more than once to advertise the company. It may also be caused by improper operation of the unit, which does not comply with the recommendations of the manual.

The first thing to do is to check if all the parts and components are in place. Also, for example, the Husqvarna will not start if it is filled with a fuel mixture that was not prepared in the correct proportions.

But if all the recommendations are observed, every detail is carefully fixed in its place, and the equipment was not purchased from the stand, the buyer probably got a defective device.

The fuel in the tank is not sufficient or of poor quality

This is one of the most common causes. Gasoline equipment users, in order to save money, often use a budget fuel. The first time the unit will do its job properly, but the problem is bound to arise after a few months of operation.

You should also remember that fuel has an expiration date, it should not be kept in the tank for more than three weeks. Such fluid quickly loses its octane rating when in contact with oxygen. This renders the gasoline completely unsuitable for use.

Filter problems

Contaminated filters are some of the main factors that prevent the chainsaw from starting. Check that the air filter is clean and is located under the cover. The fuel cleaner is directly in the fuel tank.

Location of air filter and spark plug

The breather plug in the gas tank should also be checked. For diagnosis, remove any possibly clogged parts for a while, start the unit without them.

How to “run in” a chainsaw correctly

In order for new equipment to work properly, it is necessary to run it in properly.

  • First you need to prepare a fuel mixture, the proportions of which depend on the power:

Your chain saw does not start well when cold

Bad starting sequence in cold conditions

If the new chainsaw does not start in the cold, the reason may be in the wrong sequence of starting the engine. As a rule, every manufacturer specifies in the instruction to the chainsaw, the procedure to follow when starting the chainsaw in cold conditions. It is basically the same for all two-stroke internal combustion engines that are installed on chainsaws, and is as follows.

  • Closing the choke (necessary to enrich the fuel when starting).
  • Sucking the fuel using a special primer (some chain saw models do not have this primer, and therefore this point is absent).
  • Switching on the ignition (if this is forgotten, the tool could be mistakenly considered faulty).
  • Make several movements of the starter, until the first “flash” of the engine (it is important not to miss this moment, otherwise you can “flood” the engine).
  • Set the choke to the open position.
  • Start the chain saw engine.

Problems with the fuel

As in the case of difficult to start when hot, problems in the fuel system can affect the start or not be able to make it and in the cold. Adjusting the carburetor, contaminated fuel filter and line, these are all causes of trouble starting the engine.

Carry out the diagnostics of the fuel system, it is the first thing to do when you have a problem with cold starting.

The fuel quality is also worth looking at.к. the mixture of petrol and oil, which contains small quantities of water, can make starting very difficult or even impossible.

The mixture should be used fresh enough, because.к. Storing gasoline diluted with oil for more than a month will cause the gasoline’s properties to deteriorate, making it harder to start the engine when it is cold or hot. The engine is not running so hot and the engine is not running so hot.

Engine malfunctions

Scoring of the cylinder block, stuck rings, wear of the cylinder block, air drainage through gaskets and seals, compression decrease, all these problems can make starting a chainsaw impossible or make it much more difficult. For example, when there is not much wear on the cylinder head, the compression in the engine is reduced. In this case, a cold start will be very difficult or the chain saw may not start and a hot start will start fine.

Accurately diagnosing engine problems associated with starting problems is difficult, and it is best to consult an expert in the field.

Service of the chainsaw

Maintenance of your chainsaw includes:

  • Monitor the quality of the gasoline and oil you use to make the fuel mixture. Maintain the correct proportions when doing this;
  • Do not use fuel that is more than two weeks old. Regularly check and clean the gasoline and oil tanks, otherwise the engine will stall or the saw will not start at all;
  • Clean the air filter regularly. It has an uncomplicated device and this operation will not require much effort from you;
  • Turn the bar over every time you sharpen the chain again. this will extend the life of your saw headset;
  • Regularly check and thoroughly clean the oil inlet and outlet ports, the oil channel, and the groove on the saw bar. Remember that if the automatic lubrication system is malfunctioning, your saw will start or stall;
See also  What a chain saw disassembled looks like

Chainsaw does not start well in the cold

Wrong starting sequence during cold start

If your new chain saw won’t start in the cold, it may be because the starting sequence is not correct. As a rule, every manufacturer specifies in the chainsaw manual the procedure to follow when starting a chainsaw in the cold. It is basically the same for all two-stroke internal combustion engines that are installed on chainsaws, and is as follows.

  • Closing the choke (necessary to enrich the fuel when starting).
  • Suction of fuel by using a special primer (on some models of chainsaws, primer is not provided by design, and therefore for them, this item is absent).
  • Switch on ignition (if this is forgotten, you could erroneously assume the tool is faulty).
  • Spend some movements of the starter, before the first “flash” of the engine (it is important not to miss this moment, otherwise you can “flood” the engine).
  • Set the air damper in an open position.
  • Start the chain saw engine.

Problems with the fuel

As in the case of difficult hot starting, problems in the fuel system may affect the start or not be able to make it and in the cold. Adjusting the carburetor, contamination of the fuel filter and line, these are all reasons that cause difficulty starting.

Carry out a diagnostic of the fuel system, this is the first thing to do when you have trouble starting in the cold.

You should also pay attention to the quality of the fuel, t.к. when using a mixture of petrol and oil with a small amount of water, it may be very difficult or impossible to start.

It is necessary to use a fairly fresh mixture, i.e.к. If you store petrol diluted with oil for more than a month, its properties are lost and complicates the start, both on a cold and a hot engine. Gasoline can burn poorly for this reason.

Trouble in the engine

Scoring of the cylinder-head, stuck rings, wear of the cylinder-head, air drainage through seals and gaskets, reduced compression, all these problems can make starting a chainsaw impossible or significantly impede it. For example, when there is not much wear of the cylinder head, the compression in the engine is reduced. In this case, a “cold” start will be much more difficult, or the saw can cease to start, but on a “hot”, the tool will start fine.

To accurately diagnose engine problems related to starting problems is quite difficult and it is better to consult an expert in the field.

Why a chainsaw won’t start when hot? Why is the oil leaking

Many chainsaw owners encounter such a problem as oil leaking from under the machine. Oil leaks most often because the oil hose connected to the oil pump is damaged. The picture below shows exactly when the end of the hose has ruptured and is not seated tightly on the pump connector.

But to get to this place you need to remove the clutch mechanism from the shaft. Some chain saw models may leak oil where the oil pump is connected to the oil tank hose (arrow in the photo).

chain, doesn, start, open, fire

To fix the leaking oil you need to pull the hose out of the fitting. To do this, you can use pliers, pulling the outer part of it. At the end of the hose you will see a rubber plug. which is why the oil is leaking. This plug needs to be wiped down well to remove any oil residue and then its seating needs to be sealed with something. You can use automotive sealant or fum tape, as shown in the following photo.

assembled according to the manual. won’t start. Checked the spark on the plug. no”.Alexander Goncharov, Product Manager Ltd. answers the customer’s inquiry “Husqvarna”.

I give the following information “just in case”, for the future, which is relevant to the use of any tool, any manufacturer:

I do not know what methods were used to check the spark formation, but if the check “on spark” was done by grandfather’s methods, by unscrewing the candle and “examining”, There is a spark or not, while even pressing it against the body, creating ostensibly “masses”, it is strongly not recommended (read: strictly forbidden).Modern electronic ignition systems installed on modern gasoline tools don’t hold up “tear” the spark plug and cranking the starter with the ignition on can cause the entire ignition module to malfunction.However, the electronic system creates such a discharge on the electrodes that without a special device, which can be found at a trained service technician, “at a normal sight” you can not see.

Maybe in your case it’s not so unfortunate.It is possible that not having enough experience and having done a few “the wrong” the starting procedure, the engine’s just. “over-saturated” with fuel, which prevents starting.

To correct this you must:- turn off the ignition (with the red switch down) and make sure that the air damper lever (blue) “recessed” to the stop (“retracted” towards the engine),- remove the cylinder cap (by unscrewing the 3 screws),- unscrew the spark plug again,- with the ignition off, pull the starter a few times, and it is better to hold the saw with the cylinder “down”, to more effectively remove the excess fuel mixture. Usually there is enough of it, and it takes about a dozen jerks for the cylinder to “blow out”.- screw in the spark plug, put the high-voltage wire on it,- pull the blue choke lever. In this case the red electric switch itself “come up” up by turning on the ignition,- 5-6 times with the thumb pressed in the cylinder head on the fuel primer pump (primer) until the fuel mixture “fit” to the carburetor,- positioning the saw on the ground, rest your left hand on the front handle, stand with your right foot on the pad of the rear handle of the saw, yank on the stutterer handle several times until the saw “Burrrrrrrrrrrrrrrrrrrrrrrrrrr”,- after that “slide” the blue choke lever back, without touching the upper red switch and yank the starter knob again.- usually in a couple of “twitch” saw starts.

Causes and Cures

Undoubtedly, after reading this headline, you continue reading this paragraph, and it is not surprising.

Since most chainsaw owners, we can even say with some certainty that almost every owner, has faced the fact that the device either does not start at all, or “signs of life” is, but it immediately stalls.

In fact, there are many reasons for this kind of failure in the work of the tool, and now we will try to deal with the main ones. So, let’s proceed:

See also  How to cut the baguette correctly. Fire, water and brass partition.

The chain saw starts up and shuts down right away

The cause of this kind of failure may be the flooding of the spark plug at the exact moment when you are trying to start the chainsaw. Since a significant amount of gasoline collected precisely between the electrodes, it can not create a spark. This kind of failure you can fix yourself, and you do not have to go to a specialized service.

To do this, simply unscrew the spark plug itself, and dry it. You can also try to make a glow, it will not be superfluous, but remember that this kind of manipulation should be carried out only by means of a gas burner.

Otherwise, a specific fouling may occur on the surface of the immediate electrodes itself. In the meantime, while your spark plug is drying out, you need to drain the excess fuel directly by using the hole and leave it to dry out for about half an hour.

Poor cold start

The answer is no doubt: there is no compression. What happens is that the rings, most likely through long use, simply worn out, therefore, when you try to start the device in the cold state, there is not enough compression for a direct start.

But considering the fact that most people “competent” begin to systematically jerk the handle, at that time the rings produce friction against the liner, hence oil with gasoline gets on them, the degree of compression increases and the engine starts. And when the chainsaw is already warmed up, of course it will start.

But this kind of manipulation is bad enough for the device, because if you achieve the desired effect through such actions several times, but the time will come when the chain saw can finally break down. So the best thing you can do is to change the rings, which are already worn. This is not a difficult process, so you can fully cope with it yourself without the use of services.

Why doesn’t it start when it is hot

In order to eliminate this problem it is necessary first of all to put the choke (air) in the middle position. After that, blow a couple of times to start the chainsaw. After the process has gone, warm it up within ten seconds, then transfer to the stroke mode (idle). After these manipulations you can open the choke (air vent) fully.

After that it is worth noting that before you start to take direct action on the “prescribed recommendations” try to make a start of the device directly in the idle position. To do that, just pull on the “rope”. In that case, if the engine is not hot, then the winding will be made without any problems.

But if you can’t start it, that means it’s already cooled down enough. In that case, start the engine by adjusting the half throttle to the specifications in the instruction manual supplied with your chain saw.

But if this also does not help, in that case, it is necessary to make a direct scrolling of the screw of cold running, directly in a clockwise direction.

Remember that the higher the RPM in your unit, the easier it will be for you to start the unit. And remember that the chain relative to the cold run must be stationary.

The Chinese chainsaw does not work

First of all, what I would like to note is that the Chinese devices are quite reliable and powerful, at least as practice shows. And the causes of its failure are not much different from all other models of other manufacturers. But there is one feature that does not tolerate negligence regarding the chainsaws made in China, and that is the fuel that is poured directly into it.

It is the low quality of fuel and oil that are used to prepare the mixture that is the main and probably the only reason why you can’t start your Chinese-made chainsaw.

Because many “smart guys” think that the main thing is to put in, and what to put in does not matter, and it will do as it is. And then they are surprised why the device does not work.

That’s why you don’t need to put much effort in solving this problem, just use oil and gasoline of the manufacturer which “created” your chainsaw and everything will be fine. For more information, see

A new chainsaw won’t start

In fact, with the new chain saw in principle there should be no problems, because all the parts only from under the machine and not subject to wear. The only reason why it doesn’t work is either because it’s a factory defect or because you’re not doing something right about the way the manual specifies. In order to fix this kind of problem, make sure you have “plugged and unplugged” everything correctly. It can happen with any technique, with the Russian chainsaw Lesnik, not inferior to it in quality chainsaw patriot, as well as a powerful saw Partner 350,

In addition, an important factor in the malfunctioning of the tool can be that you have prepared a mixture of oil and gasoline in the wrong proportions. Either this kind of basic “additives” you have filled with a low quality, which certainly affects the performance of the chainsaw, or a completely different manufacturer which has released your tool.

Once again, read the manual carefully, and then check every action you take with your chainsaw to the millimeter. Read the instruction on how to run your chainsaw properly.

Separately about the breakdown of the most common model

Let’s consider the problems of STIHL 180 in detail:

  • Clogged carburetor or fuel filter. These are the most common problems and can be fixed very easily after you have cleaned it. Sometimes you have to change the filter;
  • Replacement of a spark plug;
  • Sometimes the cylinder or oil seals need replacing.

STIHL saws are rugged and hardy enough that you can often fix them yourself. In fact, the same goes for Partner, Ural, Makita and Husqvarna models.

If you discover a problem with your chainsaw, start looking for the cause, checking and fixing it little by little. It’s easy to fix these problems yourself. But if the breakdown is serious and you don’t have enough experience, it should be handled by a specialist.

Related Posts

| Denial of responsibility | Contacts |RSS