Stihl Chainsaw Will Not Start

When you hit the gas

The sawing units are idling, but the saw stalls when the gas is pressed, because the load increases. Before use, the tool is warmed up by running the engine at idle for a minute. If this is neglected, the motor will stop after pressing the pedal. Other reasons could be:

  • Clogged or unregulated combustible fuel mixing assembly;
  • A clogged air filter does not provide the required air flow when the load increases;
  • A dirty gasoline filter does not allow the required amount of mixture to pass through;
  • Cylinder and piston wall rubbing.

Low octane fuel becomes the reason for brakes, because this circumstance does not allow the engine to reach the required power when the load increases.

Faulty plug: troubleshooting methods

  • Stihl Chainsaw Will Not Start

    Sometimes during the check it is possible to find out that the problem lies in a faulty spark plug. In this case, it is removed, then allowed to dry. Some owners may try to ignite it, but this should not be done, because otherwise this element will be damaged and after that it will only be necessary to throw it away. During troubleshooting, you will have to remove excess fuel by draining it through a special hole.

  • You also need to keep in mind that the drying time should be at least half an hour. After completing a similar operation, you can return it to its place, and then test it in action.
  • In some cases, the candle may fail due to the depletion of its resource. Usually, when this is confirmed, the only option is to find a replacement for this problem. In this case, it does not hurt to have a spare candle, or even better, when you have a whole set of such elements at hand. In this case, you can always put a new candle instead of the existing one and make sure whether the broken candle is the cause of the breakdown.
  • At the same time, the inability to start the chainsaw can be caused by a weak contact provided by the high-voltage wire and the end of the candle. The problem with starting the chainsaw may be due to the failure of the ignition unit. In such situations, the only solution to the problem is to replace the faulty unit, since it is not repairable.

There is no spark on the Stihl 180 chainsaw

The main malfunction due to which the stihl ms 180 chainsaw does not start may be the absence of a spark between the electrodes on the spark plug. Symptoms of this malfunction can be detected by unscrewing the plug and inspecting. Having discovered during inspection that the spark plug is wet, it is necessary to start looking for the reason for the absence of a spark on the spark plug.

Broken crankshaft bearings

In case of bearing defects, a slight backlash is felt. To detect it, the flywheel of the Stihl MS 180 saw is swinging from one side to the other. The movement indicates that the flywheel is being pulled towards the electrodes by its own magnets, resulting in no spark. To remove the mechanism, dismantle the cutting element, remove the filter and clutch cover. For the crankshaft stopper, remove the manual starter cover and tighten the two bolts.

The clutch is unscrewed with a wrench clockwise. Remove the drum with an asterisk, change the old clutch and tighten it all the way. The crankshaft is locked so as not to break the starter. The mechanism is assembled in the reverse order. To tighten, the brake handle is tilted forward, the tool is started, then removed from the brake.

Bearings with defects are less often detected (the diameter of the holes in the cage is increased). For determination, disassemble and measure with a micrometer. Broken bearings are indicated by regular knocking. In this case, urgent repair is required, since K. If the integrity of the crankshaft is violated, the piston group and cylinder will fail.

Ignition setting

Gasoline engines are equipped with an ignition system that ignites the fuel. The timing of the flash will affect the motor performance. In mass production at the factory, the ignition of the chainsaw is not adjusted. Marks are placed on the corresponding rotating elements, which are aligned during adjustment. Incorrect adjustment leads to the fact that the mechanism starts and stalls.

Before adjusting, check the dryness of the spark plug and the performance of the ignition circuit. The voltage supply cable to the candle is brought to the cylinder with a small gap and the starter is started. If there is no flash, test the cable with a probe. Then check the serviceability of the wire to the disconnecting button.

If the cables are intact, then check the ignition coil. This is done with a special tester to ring the device. In this case, the indicators on the device must coincide with the technical characteristics of the coil, which are prescribed in the instructions for use. If inconsistencies are found, then the ignition unit changes to a workable device.

The coil can be damaged by vibration when dropped or bumped, so work with caution.

Fuel system malfunctions Stihl 180

In some cases, as a rule, if there is a spark on the spark plug, when examining it, you can notice that it has a wet coating, this indicates an excessive supply of fuel to the combustion chamber and, as a consequence, the impossibility of igniting the fuel mixture.

The lawn mower will not start, or will start but stalls. What is the reason?

To understand this, you need to know the principle of operation of the unit as a whole. It also happens that, just bought, the new saw does not start, and the running around the service centers begins, in such cases it is recommended:

Read the instruction manual carefully; study in detail the method of first starting and running in lawn mowers; try to understand how the product works; how gasoline is pumped and so on.

Causes of malfunctioning lawn mowers:

The quality of the gasoline is poor; incorrect proportion of gasoline and oil; clogging of the fine filter; the spark was gone.

The lawn mower will not start, the spark is gone

The loss of a spark entails checking the contacts and the correctness of the gap between them, the conducting wires to the candle and the candle itself. The way to check the spark is to unscrew the candle, connect a wire to it, put the candle sideways to the motor casing and pull the starter several times as if starting the lawn mower, while looking at the coal and the contact of the candle, a spark should run between them. If there is no spark, take a new candle, follow the same procedure, if the spark cannot be traced, then there is a problem in the wire or contacts, it is better to replace them.

The lawn mower will not start in a cold

When starting a cold engine, it is not recommended to press the gas. Tilting the mower so that the air filter is on top, press the fuel suction button 5-6 times, set the function switch lever to the “start” position, pull the starter cord several times until the engine starts. After a few seconds of running the motor, turn off the starting system.

The lawn mower starts up and stalls. What to do?

1. There is a spark, and everything seems to be normal, but the mower will not start, in such cases you should check the air inlet valve to the fuel tank. A clogged valve leads to the creation of a vacuum in the tank, in which the carburetor does not receive enough gasoline, so the lawn mower will start, but then stall. To eliminate this cause, you need to clean the valve and try to start the lawn mower with the tank cap not completely twisted. 2. If this does not start the mower, remove and clean the fuel filter, and check all carburetor parts and then try to start. The lawn mower does not start again, the air filter is disconnected, try to start without it, if the lawn mower starts up, the reason is in the air filter, replace it.

The lawn mower won’t start after winter

In such cases, the unit must be serviced. Remove the fuel system, including filters (air, fuel), disassemble the carburetor, clean and rinse each unit. Blow out the filters with air. Pay attention to fuel quality and octane number.

It should be borne in mind that the products of such well-known companies as STIHL, Husgvarna and other brands will not run on cheap, low-octane gasoline. Suitable fuel for them is from the AI ​​grade. 92 and higher from car gas stations and then from well-recommended ones, since there is also bad gasoline at gas stations. The use of high-octane and high-quality gasoline will determine how long the lawn mower will be used and how long it will last.

It is necessary to take into account one more fact that with a long storage of a diluted fuel mixture, its working qualities drop, which also leads to consequences in which the lawn mower does not start. Therefore, it should be diluted in portions, that is, the amount of the mixture that is produced at a time. The operating instructions clearly describe and explain the mixing ratio of gasoline and oil. Strict observance of the correct proportions will at least save you from several questions, why the lawn mower does not start and what to do in such cases.

The lawn mower will not start when hot

If the lawn mower was recently in operation and has not yet had time to cool down but does not want to start. press the gas trigger, pull the starter cord sharply several times until the engine starts and only then the gas trigger is released. If enough time has passed and the lawn mower has cooled down, then start it up as if it were cold. If the above methods did not help, the lawn mower did not start, then you should contact the service center.

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Checking the fuel mixture

Before starting the engine of the gasoline streamer, check the presence and quality of the fuel mixture. Do not save, do not be greedy and "do not be clever" in this matter. Repair or replacement of the piston group will cost you too much (sometimes up to 70% of the cost of a new tool). Prepare the oil-fuel mixture strictly according to the instructions. Calculate its amount based on real needs. Excess gasoline left over after work loses its quality over time.

Breather and exhaust port

Often, "gentle" branded lawn mowers do not start and stall due to a dirty breather. The main function of this element is to equalize the pressure in the gas tank. When this unit becomes clogged, a vacuum is created in the tank, preventing the supply of fuel. You can eliminate the malfunction by cleaning the breather. You can use a regular needle for cleaning.

Normal operation of streamers with internal combustion engines may be impaired due to dirt entering the exhaust duct or clogging of the muffler mesh. There is such a problem on older generation models. The issue can be resolved by traditional cleaning and removal of the anti-spark grid.

We carry out diagnostics of a candle and a candle channel

If the quality of the fuel mixture is not in doubt, and the lawn mower stalls when started, then a flooded spark plug may be the cause. Here, for repairs, an ordinary candle wrench is suitable (every motorist probably has) and a spare candle.

  • We unscrew the candle and wipe it;
  • Dry it thoroughly (do not ignite);
  • We drain the excess fuel in the chamber through the spark plug hole and dry it;
  • We clean the old candle from carbon deposits using a file or a lady’s file;
  • We set a gap with a distance of 1 mm (you can check with any coin);
  • We put everything back in place and try to start the trimmer.

If the candle is working, the socket where it is located is completely dry, and the lawn mower does not want to start, lubricate the threaded connection with gasoline. It should be slightly damp. No matter how wonderful a spark the candle gives out, there is simply nothing to light up in a dry chamber.

If the trimmer motor still does not start, a reason such as the absence of a spark due to poor contact between the spark plugs and the high-voltage wire should be ruled out. If the connection is of good quality, but there is still no spark, most likely your ignition unit has "flown". Here it will not be possible to do without a master, since the part is not repaired, but is sold as a single unit.

Why the lawn mower won’t start. troubleshooting

Caring for the backyard plot, summer residents periodically encounter the fact that the lawn mower does not start. There are many reasons for tool failure. To correctly diagnose the problem, the owner of a useful unit in the country needs to know the device and the principle of operation of its individual parts.

  • How to start diagnosing lawn mowers
  • Checking the fuel mixture
  • We carry out diagnostics of a candle and a candle channel
  • Filter diagnostics for lawn mowers
  • Breather and exhaust port
  • complex reasons for lawn mowers failure
  • Rules for the operation and storage of lawn mowers

How to start diagnosing lawn mowers

If the lawn mower does not start or immediately stalls after starting, it is necessary to sequentially check all the main components and assemblies. The verification algorithm is as follows:

  • Fuel tank (fuel quality);
  • Candle and candle channel;
  • Air filter;
  • Fuel filter;
  • Breather;
  • Exhaust channel.

These nodes are most often the source of major problems that can be eliminated after a thorough inspection.

Filter diagnostics for lawn mowers

Another reason why the gasoline scythe stalls is the air filter. To eliminate it, try removing the filter and starting the trimmer without it. If possible, then you will have to change the air filter to a new one, or at least blow through and thoroughly clean the old one.

The petrol trimmer may not start due to a dirty fuel filter. This is the next step in our algorithm. Here we check the condition of the filter element and, if necessary, replace it with a new one. When replacing, try not to leave the suction inlet without a filter at all, this is prohibited by any operating instructions. Haste can turn into repair of the engine piston group.

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