The spark plug on the STIHL 180 chain saw fills up

spark, plug, stihl, chain, fills

All intact, clean, working?

Try to adjust. Take a long screwdriver, find the idle speed adjustment bolt (it’s on the throttle), twist it a couple of turns so the throttle is ajar. Start. It runs smoothly? Then go on. Won’t start or stops? Tilting the choke until it starts steadily.

Then we adjust the mixture quality with the L screw. Reach maximum rpm at idle. The principle is reversed here, the more the bolt is unscrewed, the richer is the mixture. After that goes the adjustment of the mixture quality at maximum speed with the screw H.

If the adjustment of the carburetor didn’t yield results, it needs to be disassembled. Check diaphragm, clean nozzles and inner passages. It is necessary not only to have a repair kit, but preferably also a spare carburetor.

General information

The German manufacturer is proud of its performance. In this case, the unit is a tool that is designed to perform a small amount of work. The tool is positioned for domestic use, which confirms the intensity of its operation, which should not exceed 20 hours per month. With such a machine at your disposal, it will not be difficult to keep order in your garden, to make firewood for the winter, as well as to clear areas. At the same time, it can help you in solving other tasks, where there is no need to perform complex manipulations.

Main Features

This saw can be considered a compact version, because its weight is only 3.9 kg. At the same time it has a large oil and fuel tank. The two-stroke engine helps to perform its working functions, and its power is sufficient for simple tasks. In addition, this tool does not produce much noise during operation, which is not higher than 98 dB. To make it easy to understand, it is enough to say that human speech generates noise at the level of 76 dB.

  • The STIHL STIHL 180 chain saw has a power output of 2.6 watts. This is in principle sufficient, considering that we are talking about a tool for household use.
  • The oil tank capacity is 0.145 liters, the fuel tank capacity is 0.25 liters.
  • The bar is 350 mm wide and has a pitch of 0.325 in.

Stihl MS180c Chainsaw SparkPlug & Air Filter Replacement

spark, plug, stihl, chain, fills

winding device

As with other saws, the carburetor is the engine starter. Taking a closer look at the carburetor that the STIHL 180 chain saw is equipped with, it should be noted that it has a single tuning screw. In other words, it is a sort of idle speed regulation screw. In this case, the nozzle, which has the full load, is stationary at all times.

In other words, no adjustment is possible. In turn, there is no way to influence the full load. It is also necessary to pay attention to the factory settings, because of which the air-fuel mixture is fed directly to the engine. And this principle remains regardless of the conditions of use of the tool.

The saw does not start: causes and solutions

Faulty spark plug: troubleshooting methods

  • Sometimes a check can indicate that the problem is caused by a faulty spark plug. In this case, remove it, then let it dry. Some owners may try to ignite it, but you should not do so, because otherwise this element will be spoiled and after that you will have only to throw it away. During troubleshooting, you will have to remove excess fuel by draining it through a special hole.
  • You should also keep in mind that the drying time should be at least half an hour. Once you have done this, you can put it back in place and then try it out.
  • In some cases, the spark plug may fail due to the exhaustion of its life. Usually, when something like this is confirmed, the only option left to solve this problem is to find a replacement for it. In this case, it doesn’t hurt to have a spare spark plug, or better yet, if you have a whole set of them on hand. You can always put a new spark plug in place of the one you have and see if the fault is caused by a spark plug that is not working.
  • At the same time the inability to start the chainsaw may be caused by a weak contact provided by the high-voltage wire and the end of the spark plug. The problem with starting the chainsaw can be associated with the failure of the ignition unit. In such situations, the only solution to the problem is to replace the faulty unit, because it is not repairable.
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Other malfunctions

  • Relevant for many owners is the question regarding the correct idling after emptying the fuel from gasoline tanks. According to experts, you do not have to worry about it. However, if you have to deal with such a problem often, then it is enough to make manipulations with the carburetor, reducing engine speeds, to restore normal operation of the tool.
  • In some cases, the owner may need to clean the muffler, as this part may be the cause of the malfunction. To perform this operation is quite simple. It should be remembered that many owners are faced with problematic operation of the chainsaw because of a faulty carburetor.
  • Although in some cases it can be quite simple to eliminate the malfunction, but it is preferable if the repair of this technique will be specialists. After all, not all of us have the necessary knowledge and skills, and this is fraught with the fact that during independent troubleshooting there is a risk of completely disabling the tool.

Before going to the service center it will not be out of place to try to eliminate the current problem with the plug priming on the chainsaw yourself. Of course, this is relevant only in the presence of direct hands, because, otherwise, there is a high probability of increasing the cost of repair work.

Poor quality fuel

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

Unfortunately, many citizens naively believe that fuel with the inclusion of alcohol has a positive effect on gasoline consumption and buy fuel surrogates. In some cases the economy is true, but such fuel has a negative effect on the chainsaw engine, reducing its service life.

Improper starting

As a rule, during the first start of a chainsaw, inexperienced men miss a pop when the air damper is closed and keep pulling the starter. Because of it, a large amount of fuel is piled up in the combustion chamber, but the air is critically lacking. The spark plug is flooded with an excess of gasoline, and a spark is out of the question.

Clogged filter

Due to a heavy clogging of the chainsaw’s paper filter, the fuel chamber is not getting enough oxygen. The fuel mixture does not have time to ignite and the gasoline fills the spark plug. If the filter has already used up its resource (this will be noticeable by its appearance), it must be replaced. In case you do not have a new filter at hand and it is still necessary to work, you can try to blow out the filter with a reverse air stream.

Different makes and models of chainsaws differ from each other. To clean or change the filter, it’s a good idea to first look at the owner’s manual. Well, or take a look in there if you can’t remove the filter without prompting.

Failure of the ignition system

This is probably one of the most difficult problems that will need to be overcome in order to continue to use the chainsaw. There can be several reasons of malfunction occurrence.

Improper clearance

For the most part, the gap on a chainsaw spark plug should be between 0.5 and 1.2 millimeters (more exact data should be in the owner’s manual). In order to check whether this is the case, it is necessary to perform the following actions:

spark, plug, stihl, chain, fills
  • Use a screwdriver or special wrenches to loosen the screws that fix the chain saw cover.
  • After gaining access to the flywheel and the magnetic core, the gap is checked.
  • If it does not correspond to the characteristics declared by the producers, the necessary distance can be set with special spacer or improvised means (an ordinary sheet of A4 folded several times will do).
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The problem is in the ignition coil

To verify that the ignition coil is working properly, you need to know how to use a multimeter. This device allows you to measure the degree of resistance of the coil. A good coil will have a resistance. A burnt coil has a line breakage or short circuit.

If the coil is intact, the clearance between the coil and the flywheel is probably broken. To adjust it, it is necessary to perform a number of simple actions:

  • Disassembly of the body of the saw and loosening of the bolts that fix the ignition system. It is necessary to bring the magnet (magneto) of the handwheel to the coil itself.
  • The adjustment plate is inserted between the flywheel magneto and the coil itself. The gap should be within 0.2 mm.
  • After the bolts are tightened, the adjustment plate is removed.
  • It is necessary to crank the flywheel completely and several times (2-3 times will be enough). In doing so, it should not cling to the coil.
  • The final step is to assemble the chainsaw body.

Misalignment of the carburetor

The spark plug often fills up on a chainsaw because the carburetor is not working properly. For clarity we recommend to watch this video

If this is the first time you will be adjusting the carburetor yourself, pay attention to the following factors:

  • Built-in compensators and other automatic control elements make it impossible to make adjustments without special equipment. You would have to call in a professional service center.
  • In the absence of a proper effect from the adjustment of the carburetor, the cause of plugging will be, the float hangs or the lack of tightness of the valve.

STIHL 180 stalls at idle. Read also

A chainsaw can be shut off if the fuel filter is blocked.

The air filter also you will like more clogged with dirt as it is also called dust, which leads to malfunctions at idle speeds. keep in mind that clogging of this filter occurs at times, under the influence of which the flow of air into the system is hindered. In the fuel-air consistence increases a little bit of gasoline, and it comes out over-enriched. You can’t expect the motor to work normally under such circumstances.

For cleaning, the air filter is removed with special care so as not to shake the dust into the carburetor. Then it is cleaned and flushed thoroughly. A detergent is added to the flushing water. After drying, the air filter is returned to its proper place in the chainsaw.

For normal cutting tool operation, it is recommended that the fuel and air filters be changed every couple of months.

It is common knowledge that the main component in the ignition system should be changed at least once a year. But it’s not uncommon for saw owners to forget about this rule. There is therefore no reason to be surprised that a machine that is maintained in a fragmented manner does not “hold” the idle speed very well in the end.

Chainsaw spark plug needs to be changed once a year.

Therefore it is necessary to find out on the subsequent malfunctions associated with the service of the given set of accounting programs:

  • Filling the spark plug with gasoline at the start. To fix the problem unscrew the spark plug and without even igniting, dry it. Excessive gasoline is being spliced out of the engine through the hole where the spark plug is screwed in. After a break of half an hour the spark plug is installed to the area, the mechanism is started.
  • Lack of spark because of the bad contact between the spark plug tip and the high voltage wire. The connection is checked, if there is a defect, the defect is eliminated.
  • No spark due to a malfunction in the electrical ignition unit. If you can be confident in the reliability of the connection with the tip of the high-voltage wire, alas, a spark when the starter is on and there is no before, the precondition for failure and perhaps a faulty ignition unit. Myth component cannot be restored, it can only be replaced with a new one.
  • Incorrect gap between the spark plug electrodes. In different types of candles This figure ranges from 0.2 to 0.5 mm. The correct gap is set by using a feeler gauge of suitable thickness. A larger or smaller gap is not allowed for this type of plug.
See also  Stihl 180 Chainsaw Chain Does Not Spin


Until some time ago, a chainsaw was considered quite powerful, and at the same time expensive and heavy professional equipment used for logging work. However, over time, manufacturers have significantly expanded the model range of such equipment, releasing many lightweight and compact products for work in the countryside.

Today machines like the one in the next photo are no longer exclusively professional machines for woodcutters. It is a tool, useful in construction, repair work, in cutting dry branches, when cutting firewood and the like. But to keep it running smoothly, you need to know what to do if a spark plug fills up on a chainsaw. Or how to repair such equipment in case of breakage of other constituent parts. This will be discussed further below.

Tips for fixing the problem

If the chainsaw spark plug is still wet and you don’t want to wait for the fuel to drain out, there is a fairly efficient and quick method of cleaning.

  • If the repair takes place in the field, the saw is installed on a flat surface (in the workshop everything is easier. a table to help), then pulls the BB wire from the plug and with a wrench pulls the plug, its electrodes are wiped dry. In this case, the circuit breaker system must be on.
  • Unscrew the air filter cover, which is cleaned of dirt.
  • The control lever is then set to the minimum throttle position, and the starter cord is jerked up to 10 times, but not less than 5. The combustion chamber is thereby cleared of excess fuel.
  • After putting back the air filter, installing the spark plug and connecting the wire, you should pull the starter cord a few more times. The throttle valve must remain open.

If these steps are performed correctly, the saw will come back to life.

Most chainsaw owners have been able to fill the spark plugs and they themselves have also been able to get the spark plugs working again and again. Do not be afraid of this problem: straight growing hands and the presence of the user manual will help without going to a specialized center to continue using the tool.

Algorithm for determining the causes of poor mixture formation

In any case, a wet spark plug on the chainsaw indicates a pronounced disproportion in the composition of the fuel-air emulsion. Already with a fuel to air ratio of 1:14 the spark formation conditions worsen, the lack of air impedes the normal combustion of the fuel-air emulsion compressed in the combustion chamber.

The main causes of mixture over-enrichment in most cases are standard:

  • the air intake filter is clogged;
  • improper carburetor adjustment;
  • ignition system malfunctions;
  • Also, poor gasoline quality and an improper starting sequence may be an issue.

How to check if the fuel is coming

If the spark plug is in good order and has a spark on it, the problem is probably a lack of fuel supply. You can verify this by performing the following actions:

STIHL chain saw repair if the fuel system is malfunctioning

  • unscrew spark plug;
  • fill a syringe with 1-2 ml of fuel and pour it into the spark plug hole;
  • Replace the spark plug and put the cap back on the spark plug wire;
  • set the control lever in the hot start position;
  • Pull the starter grip several times.

If these steps helped start the STIHL chainsaw engine but it stalls almost immediately, then the problem was really a lack of fuel supply. To fix it, you need to check the fuel system.