Stihl 180 Won’T Start

Stihl 180 chainsaw will not start: reasons and repairs

Stihl 180 Won'T Start

And the world-famous Stihl company produces a huge range of high-quality chainsaws. For domestic purposes and simple work, the Stihl 180 chainsaw was created, which showed excellent performance and reliability. All the best practices of the German company were used here, with a weight of 3.9 kg, the chainsaw easily performed work in the garden. It is easy to cut small trees, branches with it, you can even prepare firewood. But any even the highest-quality equipment tends to break down, and it so happens that the Stihl 180 chainsaw does not start or start with great difficulty. We tried to collect all the reasons and methods of repairing the German Stihl 180.

No spark

If the chainsaw does not start, while you have not experienced any special difficulties before, the first thing to do is check the spark plug. There may simply not be a spark between its electrodes; this can be determined only after removing the candle. We check its performance, for this we stick the candle into the cap of the high-voltage wire, put the candle on the metal side of the cylinder (or other metal object). Now we do several manipulations of the starter, and if during them a spark is not observed, the problem is specifically in the spark plug.

Attention: be sure to make sure that the ignition is on, otherwise the spark plug will not spark in any case. Also, to make sure that the plug is faulty and not the ignition coil, take a similar plug and test the spark on it. If there is one, the problem is solved by a simple replacement.

Ignition coil defective. Fuel supply to the chainsaw

If the Stihl 180 does not start, there is a spark, then first of all we check the presence of fuel in the chainsaw tank. Of course, the problem is funny, but quite common. Next, we check if fuel is entering the carburetor; for this, you can disconnect the gasoline hose from the carburetor and pump in gasoline. After several manipulations, gasoline should flow from the hose, but not in a large stream, but in small jerks. If gasoline is not running or running poorly, the problem may be as follows:

Clogged fuel supply channel;

Directly connect the fuel filter.

As unusual as it may sound, even a too full fuel tank can cause it. If the pressure is high, the fuel hose may squeeze out or the required vacuum may not be created. Be sure to monitor the quality of the fuel used; for proper operation, never leave the chainsaw with gasoline for more than 2 weeks. Long storage of fuel in the tank contributes to the formation of resins and the process of polymerisation of components.

Fills the spark plug

In some cases, the Stihl 180 will start and stall or not start at all. Then we check the condition of the candle, it can be flooded. There can be two reasons for this “overflow”. Improper starting of the engine on a cold one and a malfunction of the carburetor. We try to solve the problem with the following actions:

Remove the spark plug;

We turn the chainsaw over the other side and wait until excess fuel flows out;

For better confidence, we jerk the starter several times, so gasoline will surely come out of the cylinder;

We return the candle to its place, install the cap and try to start the engine again with a starter.

Defective crankshaft bearings

If the Stihl 180 does not start and the fuel flows correctly, you will have to look further, namely into the crankshaft. Its bearings tend to wear out, which causes backlash and attempts to shake the flywheel. The fact is that in the presence of play, the flywheel magnets are attracted to the ignition coil, or rather to its contacts.

To repair and replace bearings, it is required to disassemble the motor, so this work is performed only by craftsmen or people with experience. Do not disassemble the engine if this is your first time.

No spark

Spark plug test is performed. Various factors affect the functioning of an element. When testing the mechanism, the reasons are revealed:

  • Insufficient adjustment of the carburetor;
  • Large oil in gasoline;
  • Clogged fuel and air filters.

Due to work in such conditions, carbon deposits accumulate on the plug contacts. Subsequent corrosion of the conductors causes no spark in half of the fault cases. This is because the gap between the modular contacts changes. To test the spark, do the following:

  • The tip of the high-voltage cable is removed;
  • Unscrew the candle;
  • The tip is put in place;
  • The candle is leaned against the cylinder with its wide end;
  • Start the starter.

If, at start-up, a bright spark resembling lightning appears between the electrodes, then the ignition unit is operational. In the absence of a flash, clean the entire element and expose a gap between the conductors. Sometimes there is no clearance between the flywheel and the ignition coil. When rubbing the flywheel, scratches are visible on its exterior.

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At full speed

Sometimes the engine will stall after normal operation. To establish the cause, pay attention to the accompanying circumstances:

  1. Motor stalls in the middle of operation for no apparent reason. The starter is stationary and does not turn. It means that the tool is jammed and requires urgent repair.
  2. During normal operation, power is reduced in a short time and the engine stops, the cylinders are overheated. The situation indicates the occurrence of air suction under the rubber pipe between the carburetor cylinder, possibly due to a rupture. Air depletes fuel, nozzle replacement required.

How to properly start a Stihl chainsaw: instructions

The tool manufacturer has taken all measures and developed a manual that makes the mechanism easy to start. The user will protect himself from injury if he fulfills the proposed frequency of actions:

  1. The ignition is turned on and the engine handle is in the down position. The intake of atmosphere from the air filter is blocked by the carburetor flap. To properly start the chainsaw, the throttle membrane must be open to enrich the combustible mixture.
  2. The lever is set to the start throttle position. The starter jerks several times before the first spark appears. If the flash passes, the instrument is ready to run. The mechanism runs at high speeds due to the closed throttle diaphragm. To transfer it to the idle speed, the gas trigger is pressed and the rhinestone is released. The number of revolutions quickly returns to normal.
  3. On the Stihl MC unit of the standard configuration, additional devices are not provided to start the chainsaw in a lightweight version.

Fills the spark plug

In this case, the spark is not able to ignite the fuel, which enters the furnace in large quantities to burn the combustible mixture. If it floods a candle, then the carburetor is faulty or a cold engine does not start correctly. The engine is purged, the procedure is performed with the ignition off and away from an open flame. To ensure that the fuel ignites at the time of start-up, the mechanism is cleaned:

  • Unscrew the candle, wipe it dry, dry it for half an hour;
  • A large layer of carbon is removed with a file;
  • Adjust the gap between the contacts;
  • The tool is turned upside down and the gasoline is drained;
  • In this position, pull the starter several times (to remove fuel residues);
  • Reassemble in reverse order.

Fuel supply

After unscrewing the candle, a wet bloom is found on its surface. This indicates an excessive supply of gasoline into the combustion chamber. For this reason, the tool does not work or stalls, since the fuel does not ignite.

Another inhibiting factor is a clogged breather. A small hole in the gas tank cap. It is cleaned with a needle, otherwise the Stihl MS 180 chainsaw will not start. To determine the incorrect fuel supply, follow the sequence:

  • Remove the candle;
  • 2 cubes of gasoline are poured into the hole of the candle with a syringe;
  • Put the ignition device in place and put on the cap of the high-voltage wire;
  • The lever is moved to the hot start position;
  • Pull the starter handle a couple of times.

If the tool starts up and immediately stalls, then the fuel line is tested further. Check the gasoline filter, splash from the crankcase, the integrity of the baffle in the pump when unscrewing the cover.

What to do

The power tool is operated according to the manufacturer’s instructions. Only after checking the chain tension does the unit start. At the same time, the filling of the tanks with a combustible mixture and oil is controlled, the device is securely fixed in the hands. If, when all the rules are followed, the mechanism refuses to work, then the Stihl chainsaw is repaired.

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Why does the Stihl 180 carburetor overflow and a few typical faults

After we have examined the carburetor device, it will not be difficult to determine the reason why fuel enters the combustion chamber in a larger volume. This is due to the wear of the gasket between the compensator cover and the carburetor body. You ask how this might affect?

The answer is simple, by shrinking, the gasket releases the diaphragm on top of it a fraction of a millimeter down. She, in turn, will press harder on the rocker arm of the needle valve, it will open more than it should be and the fuel will flow in excess (it will start to overflow).

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Another reason is the stretching of the diaphragm itself, this happens as a result of natural wear and tear. It is impossible to prevent this process, but you can solve the problem by periodically changing all the gaskets, carburetor diaphragms, and the fuel pump. There is a repair kit for this.

When cleaning the chainsaw with compressed air, never blow into the fuel pipe, as this can stretch the diaphragm.

Air damper

The carburetor choke is installed on the opposite side of the throttle and is responsible for starting a cold engine, it is controlled by the engine control lever. For a cold start, the air damper is completely closed, for normal operation, open.


The fuel injector is mounted in the carburetor body in such a way that it is a connecting link between the distribution chamber and the cavity in which the throttle valve is installed. Simultaneously with the fuel, air is supplied to the nozzle and an air mixture is formed. The injector has a check valve that blocks the flow of air in the reverse sequence, that is, from the throttle chamber to the distribution chamber.

Frequent breakdown of the Stihl carburetor and how to avoid it

A common reason for the failure of the carburetor on the Stihl chainsaw is a sticking valve in the nozzle. The reason for sticking is a violation of the storage of the chainsaw, or rather the instructions of the manufacturer Stihl 180 for proper preparation for storage.

As follows from the instructions, before long-term storage, it is necessary to drain the fuel from the tank, then start the saw and burn the gasoline from the carburetor. Failure to comply with this elementary rule entails the following consequences. The forsknui valve, being in direct contact with the fuel, sticks to the body, since the gasoline evaporates little by little and only sticky oil remains. It is impossible to replace the nozzle, because they are not in the repair kit, you can only try to knock it out and rinse it, which is not always possible to do without damaging the nozzle.

Major malfunctions and ways to eliminate them

The operation of the tool must be carried out in accordance with the instructions attached to it. Include start button only after the chain tension, the presence of a fuel mixture and oil have been checked. Having securely fixed the chainsaw in your hands, you can get to work.

If the tool refuses to work, then first of all it is necessary to identify the cause of the malfunction. And the most common tools for repairing a chainsaw are suitable: various screwdrivers, socket and wrenches, hexagons.

Do-it-yourself repair of the Stihl 180 chainsaw: instruction

The Stihl 180 chainsaw has proven itself well in the construction market. This portable device has a power of 1400 W and a motor volume of 31 cc. See The length of the saw chain is 350 mm, at idle it makes more than 2 thousand revolutions. Its popularity among consumers is also explained by the acceptable cost of the tool. However, when using a chainsaw, malfunctions occur from time to time. In the service, repairing a tool is not cheap, so those who understand at least a little technical issues fix breakdowns with their own hands.

If the chainsaw won’t start

If you believe the experts, then with such a problem, first of all, you just need to open and close the lid on the gas tank. After that you need to make combustion chamber ventilation, and remove and dry the candles. These actions are enough for the tool to start up and work. If the malfunction remains, then the cause should be looked for in another.

  1. The fuel supply is affected by the breather. Therefore, if it becomes clogged, then a vacuum forms in the fuel tank and the saw will not start. The breather is repaired very simply. It should be cleaned with a needle.
  2. Chainsaw “Stihl 180” may not work due to a broken cylinder. If there are chips or irregularities on the cylinder, then the reason is in it.
  3. If the tool does not start, holds power for a short time, or stalls immediately after switching on, then the cause of the breakdown may be in the muffler. It can be clogged by any deposits that occur during operation during the exhaust process.
  4. The saw may start poorly due to a malfunctioning starter. To see it, remove the cover from the carburetor and twist the special screen located behind the chainsaw drum. If the contact wire has moved away from the starter, then it must be attached with a blowtorch. If the problem lies in oil leakage, then the starter is simply wiped with a cloth.

Chain oil leaking

Sooner or later, every tool owner will face this problem. The cause of this malfunction is a leakage at the junction of the oil pump and the hose from the oil tank.

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To eliminate this problem, you will have to practically completely disassemble the chainsaw.

  1. If the hose is damaged, it is best to replace it with a new one. You can try to fill it with sealant, after degreasing and rinsing.
  2. Oil can leak if the saw oil filter is clogged or broken. It should be checked and cleaned or replaced.

Chainsaw engine runs intermittently

The reason for such a malfunction may be breakage of the cylinder-piston group, which is easy enough to repair with your own hands.

To remove the cylinder from the tank, four bolts must be unscrewed on its head. Then carefully check the piston, on which there should be no scoring, scratches, chips. If present, the piston will need to be replaced.

Optimum pressure in the combustion chamber is ensured by the piston and piston rings, which must sit tightly enough on the piston body. If the piston inserted into the cylinder during rocking has a free stroke, this indicates its wear.

You can eliminate this defect by cylinder bore and installation of repair parts. However, the easiest way is to simply replace the entire CPG set.

Chainsaw carburetor malfunctions and repairs

What to do if the instrument stops winding up, starts to stall, loses power, does not keep idling? Quite often, the cause of such breakdowns lies in the carburetor, which could become clogged with dust, dirt or sawdust. You can deal with this problem with your own hands.

All carburetors are cleaned the same way, the main thing is not to be afraid and not to lose anything. For repairs you will need to prepare:

  • Any brush;
  • Phillips screwdriver
  • Head 8;
  • Some gasoline.

First of all, using a brush, dirt and dust are cleaned. Then the cover and filter are removed. The two nuts of the air filter are unscrewed, and the air collector housing is removed. You can now see the carburetor and throttle and throttle rods. Lowering the throttle with your finger down, you will need to remove the accelerator lever.

To move the carburetor out of the seat, first remove the choke lever and completely close it. Now you need to remove and pull on the engine stop wire. It is also necessary to remove the plastic arm to which the wire is attached. On the right, it is inserted into the hole, and on the left, it can be lifted.

The carburetor is released and can be removed and cleaned. It is best to do this with a compressor, but if there is none, then the details can be rinse in clean gasoline.

Do not forget about the fuel filter, which must also be removed and the fuel hose blown out. Everything goes in reverse order.

If, after assembling the carburetor, the saw does not start well, and smoke comes out of the muffler, then most likely the spring under the needle lever has been lost. Due to the absence of this spring, the needle does not shut off the fuel supply, therefore, the spark plug “fills” with gasoline. Of course, to eliminate this malfunction, you should find the spring and put it in place.

When repairing a carburetor, remember that it is a rather complex assembly, which consists of various small rings and parts. Therefore, it must be cleaned and repaired with extreme care and attention.

If the chainsaw does not start or stalls, then in addition to the carburetor itself, you should check spark plug performance. If it is faulty, then it should be unscrewed and dried. Also, excess fuel must be drained from the candle through a special hole.

It must be remembered that drying must be carried out for at least thirty minutes, after which the candle is installed in place and the tool starts.

The cause of the malfunction may be a weak contact between the end of the spark plug and the high-voltage wire. If you don’t like the work of the candle at all, then it is better to replace it with a new one.

Such parts of the Stihl 180 chainsaw as anti-vibration elements, chain, tire, drive sprocket wear out faster than others. Therefore, it is recommended to keep spare parts in the workshop for quick replacement.

Eliminating the causes of chainsaw malfunctions with your own hands will, in any case, be cheaper than repairing a tool in a service workshop. In order not to puzzle over why the tool stopped working, you can see the instructions for eliminating various breakdowns of the Stihl 180 chainsaw. However, in case of serious breakdowns, it is better not to do the repair yourself, and entrust the work to a specialist.