STIHL chainsaw stalls at idle

The chainsaw starts and stalls. Why?

There are several simple rules for operating and maintaining a chainsaw, compliance with which will maximize its service life. Preparing the correct fuel mixture, regularly cleaning filters and periodically replacing parts will save you from the need to repair your tool for a long time. If it was not possible to avoid a breakdown, then you can figure out its cause completely on your own. This applies to all brands of chainsaws, from the more complex Husqvarna and STIHL to the simplest Makita and Patriot models.

Chainsaw stalls at idle

There are common cases when a chainsaw stalls at idle. First of all, you need to check the muffler, and, if it is dirty, clean it from exhaust tar deposits. Also on carburetors of some models and others there are bolts marked H and L - coarse and fine adjustment, respectively. By adjusting the bolt L while the chainsaw is running so that its speed increases (turning the bolt only half a turn is enough), it is possible to eliminate this problem. Adjusting the carburetor requires an electronic tachometer and is a rather labor-intensive process. That is why in such cases it is better to turn to professionals.

Chainsaw stalls under load

If the chainsaw stalls under load, the cause may be the fuel system or a dirty air filter. Changing the fuel while maintaining the correct gasoline/oil ratio or cleaning the air filter are universal solutions to this problem. An incorrectly prepared mixture of low-quality gasoline and, for example, machine oil is the main reason for the malfunction of a chainsaw, including when it heats up and stalls.

Chainsaw stalls when tilted

When the chainsaw is in a horizontal position, the fuel tube lies at the bottom of the gas tank, but when the tool is tilted, the tube is above the fuel mixture, i.e. in the airspace. This is precisely the reason why a chainsaw stalls on its side.

The chainsaw immediately stalls

What to do if the chainsaw stalls immediately after starting? First you need to check the presence of fuel in the gas tank. If its level is not sufficient, then you need to prepare the fuel mixture in strict accordance with the ratio of gasoline and oil prescribed in the operating instructions. Gasoline must have the highest possible octane number, and the required brand of oil is usually indicated in the chainsaw’s data sheet.

Next, we check the spark plug, as well as the contact of its tip with the high-voltage wire. The gap between them should be no more than 0.5 mm. If necessary, the candle is cleaned of carbon deposits and dried. It is recommended to occasionally change the spark plug to a completely new one. The reasons why the tool stalls when you press the gas lie in the fuel filter or carburetor jet. Cleaning the gas filter will not take much time and effort, but it is better to entrust the disassembly and cleaning of the carburetor to the service center specialists.

Chainsaw stalls at high speeds

If the tool stalls at high speeds, you need to check three parts: the air filter, the fuel pump and the gasoline filter. The air filter needs to be cleaned, you can even wash it under water and dry it thoroughly. Then just disconnect the fuel hose from the carburetor and see whether fuel flows out of it or not. If it flows in a full stream, the gasoline filter does not need to be checked. If on the contrary, then a fault has been found. The breather can be cleaned with a regular needle, and the filter can be carefully disconnected from the suction hose, cleaned, or replaced with a new one. The gasoline pump is checked for wear: if fuel does not leak through it, then everything is fine with it. If the problem that your tool stalls at full speed is due to some damage to the pump, then this part simply needs to be replaced with a new one.

Repair and service of garden equipment.

Specialized service. comprehensive warranty and post-warranty service for gardening and municipal equipment from global manufacturers! We sell spare parts with delivery throughout Russia!

Cleaning the fuel filter

If there is insufficient fuel supply, the chainsaw stalls when accelerating. The reason may be a clogged fuel filter and improper carburetor operation. How to check if the filter is at fault? To do this, you need to partially disassemble the tool body to gain access to the carburetor. Disconnect the fuel hose from it and press the fuel pump several times. On modern saws, this is a transparent rubber hemisphere that is pressed before starting the engine.

If gasoline begins to splash out of the hose vigorously, then the filter is in order. If fuel flows reluctantly, then you need to change or clean the filter.

It is located inside the gas tank, and to get it out, you need to remove the plastic protection, then use a flat screwdriver to pry off the rubber cuff through which the fuel line passes. You must remove it carefully so as not to damage the rubber. Otherwise, it will leak after installation. In some chainsaws, the filter is removed through the neck of the gas tank.

There is a fuel filter at the end of the fuel line installed in the tank. Usually it becomes clogged with tarry deposits found in gasoline and oil. The filter is pressed into the hose and can be removed by simply pulling it out. It must be washed in hot water with cleaning agents or replaced with a new one.

Checking and repairing filters

The engine may run rough or stall if there is not enough fuel or air. Causes: clogged air or fuel filter. To check the fuel filter, you need to remove the fuel line hose from the carburetor fitting and direct it into a container. Then press the fuel pump several times. If the fuel is pumped normally, in clearly defined doses, without dirt, then the fuel filter is working properly. If the stream is weak or fuel is not pumped at all, the filter needs to be replaced or, if possible, cleaned.

Clogging of the fuel filter with sawdust is one of the reasons for chainsaw breakdowns.

The device must be removed from the fuel tank (after draining all the fuel from it). On most models, the fuel filter can be pulled out with a wire hook through the neck. If the filter design is dismountable and can be cleaned, it must be disassembled and washed in accordance with the manufacturer’s recommendations. Otherwise, replace it with a new filter.

Similar problems can arise when the air filter is clogged with dust, sawdust, or dirt. If there is insufficient air, the fuel mixture will be enriched and the fuel combustion process will be difficult.

To check, remove the filter. During operation, precautions must be taken to prevent dust from entering the carburetor. The device must be cleaned and rinsed in warm water with added detergent. After drying, if possible, blow with low-pressure compressed air and reinstall. If the chainsaw works normally, then the cause has been eliminated; if not, you need to look further.

If the tool is used continuously, it is recommended to replace the filters of the fuel and air systems after 3 months.

One of the reasons why a chainsaw does not develop speed when you press the gas, but rather stalls , is a malfunction of the carburetor. Let’s say the STIHL 180 saw worked properly, and then it was installed for a long time and was not even used. After starting it, it works fine at idle, but when you press the gas it can stall. Why does it stall? The reason is a stuck carburetor valve nozzle. This is not 100%, unfortunately the possibility of such a malfunction is extremely high. We recommend reading the article about the design and repair of the STIHL 180 carburetor.

In order to check the nozzle, you need to remove the carburetor and disassemble it. To remove, you need to unscrew the two nuts securing the air filter and the carburetor, then remove the air filter and the engine control lever, in this case disconnecting the air damper control rod from the carburetor. Next, you need to slightly pull the carburetor towards you only and disconnect the fuel supply hose.

READ Braid STIHL fs 55 carburetor adjustment

It is necessary to very carefully remove the fuel hose, and prepare a plug here in advance, since with its use fuel must flow.

Having removed the carburetor, it must be blown out and cleaned of dirt, only after a while the carburetor must be untwisted.

You need to unscrew the cover of the main chamber of the carburetor; this is the one on which the compensator is installed on top. Next, use an 8 mm bolt and a length of more than 50 mm. We knock out the valve.

You need to knock out the valve by placing the carburetor on a wooden stand, this will protect it from damage to the body.

If the nozzle is removed, of course, blow it out with a compressor. The valve must allow air to flow exclusively in one direction; if, of course, the valve is free to blow in both directions, it means it is faulty and needs to be replaced with a new one. If the valve has been repaired, you must reassemble the chainsaw in the reverse order of disassembly.

To see clearly how a carburetor is repaired, or more precisely, how to correctly knock out the injector valve from the carburetor body, of course, watch the video.

The next common reason why a saw may stall when the speed increases is air leaking into the carburetor. You can check this only with a special tool, but it is worth seeing that if preventative work on the carburetor has not been carried out for more than one year, then you can install a new set of gaskets in the carburetor. Sometimes this helps solve the problem of its depressurization.

When disassembling the carburetor to change the gaskets, you need to closely examine its needle valve, press on the rocker arm and check its lifting. From time to time, especially when the STIHL chainsaw has been standing for a long period with fuel in the carburetor, the needle may burn to the carburetor body and not even do its intended purpose. Simply put, the needle valve will not allow the fuel mixture to pass through. Then the saw doesn't work.

Stihl ms180 chainsaw stalls at idle (eliminating the cause)

The first and most common cause of this malfunction is incorrect carburetor adjustment. You can adjust the idle speed yourself; for this purpose you need to have a STIHL adjusting screwdriver, which is supplied with the unit. The adjustment hole is located on the right side of the STIHL 180 saw on the handle and is marked with “-” and “”.

If chainsaw does not maintain speed and stalls at idle, you can be virtually 90% sure that it has a malfunction in the fuel pump operating system, usually this is air leaking into the crankcase through the pan gasket, as it is also called, which is much more often, through the seals crankshaft. The air suction reduces, as it is also called, and generally completely stops the impulse, which is supplied through special channels to the fuel pump of the chainsaw. Upon completion of this, the STIHL 180 chainsaw does not receive the required amount of fuel and stalls at idle.

help. When the chainsaw works under load for 10 seconds, then the speed drops sharply for a second and then it runs again for 2-5 seconds and then the speed drops again. I disassembled the carburetor, blew everything clean, the filter is also clean, both air and fuel. When cold, it starts normally.

Jpeg wrote: I ask for advice. STIHL ms 180 stalls at idle. When you release the gas lever, it first smoothly drops the speed, then it starts to work unstably with twitching, and then after an indefinite amount of time it stalls. After this it is difficult to start. If you give it gas, it's better! If you put the saw on its side (on any side), the idle speed increases almost to the point at which the chain begins to spin along the bar and the saw does not stall. What can give such an effect? What I have already done: replaced the spark plug, cleaned the air filter to perfection, installed a new gas filter. I went through the entire saw, looked at all the areas where there could be air leaks, checked the gas hose for leaks, disassembled the carburetor and blew air from the compressor, and checked the condition of the membranes. They are intact, slightly stretched. Changed the crankshaft seals. I installed them on Permatex sealant. I tried to start it without the top cover, bypassing the air filter completely. Opened the gas tank while the saw was running. Nothing helps. What points attracted attention: there are burrs on the cylinder and piston, but not very deep. The mounting hole of the air damper axis is broken because someone before me lost the lock washer. There is about half a millimeter of play. The throttle valve sits rigidly. The spark plug quickly becomes clogged with soot when idling. And in general, compared to the Husqwarna 137, gasoline is consumed two times faster. It seems like the carb is getting rich. Where else can you go, what can you see? Or, after all, the whole problem is in bullies.

you need to look for what causes the bullies - they appear in this device for a reason

The chainsaw stalls at idle speed: many owners of this tool face this problem. In terms of its design, the saw is a fairly simple tool. But there are times when it fails. The main problem in troubleshooting is determining the correct cause of abnormal operation. Once the cause is identified, eliminating the defect is usually quite simple.

Checking the spark plug and ignition system

According to manufacturers' recommendations, the spark plug should be changed annually, regardless of the intensity of use of the tool. Failure to follow these tips leads to a completely natural result: failures at idle speed and subsequent failure.

Typical ignition system defects are as follows:

The spark plug was filled with fuel at the time of start-up. It is necessary to remove it from the socket, dry it, and, if possible, blow it with compressed air. Drain the remaining fuel from the cylinder through the installation hole and blow it out with compressed air. Then install the spark plug, connect the high-voltage wire, and start it.
No spark at the spark plug electrodes. You need to disconnect the high-voltage wire and check for a spark on it. If the spark is normal, check the connection and eliminate any defects found. The absence of a spark on the high-voltage wire indicates a malfunction of the ignition unit. This device cannot be repaired; it must be replaced with a new one.
The gap between the spark plug electrodes is broken. This parameter for different types of devices can range from 0.2 to 0.5 mm. Checking and adjustments must be performed using a special probe or caliper. The required value can be found in the operating instructions for the tool.
By the appearance of the candle, you can determine the direction of the search. If the spark plug turns out to be dry after several attempts to start the engine, it means that gasoline is not entering the cylinder. It is necessary to check the fuel supply system and carburetor.
The presence of black soot or carbon deposits on the electrodes indicates incorrect carburetor adjustment or a clogged air filter. Possibly, low-quality fuel with a large amount of oil is used. During normal operation of the ignition system, the electrodes have a uniform gray color and a brown coating on the insulators.

Carburetor depressurization and nozzle blockage

Sometimes, when the screws securing the carburetor cover are loose or the gaskets have become unusable, the chainsaw may also experience a loss of power. To eliminate the possibility of this malfunction, it is necessary to check the integrity of the gaskets and the tightness of the screws on the carburetor covers.
To do this, you need to remove it from the engine (the algorithm is described above) and disassemble it. Defective gaskets must be replaced using spare ones from the repair kit for the Shtil MS 180 carburetor. In the case where a full check of the fuel supply and exhaust gas system has been carried out, but there are no results. The main fuel injector valve needs to be checked. To check, you need to knock it out of the carburetor body. All work should proceed according to the following algorithm:

The carburetor is removed from the chainsaw.
The four screws securing the cover with the compensator are unscrewed, after which the cover can be removed.
The carburetor is installed on a wooden lining, after which, using a bolt with a diameter of no more than eight millimeters and a length of 50, it is knocked out into the internal cavity of the carburetor.
Next, you need to select a small hose, the inner diameter of which matches or is slightly smaller than the outer diameter of the nozzle and put it on the nozzle.
The next step is to blow inside the hose. If it only blows in one direction, the nozzle is working properly; if it blows in both directions or does not blow at all, then the valve needs to be replaced.

All of the above actions should help in eliminating the problem associated with the fact that the chainsaw does not pick up speed, otherwise, a full diagnosis at the manufacturer’s service center will help.

Probable reasons for failure

The power unit of all chainsaws is a single-cylinder internal combustion engine. Devices of this type are characterized by such malfunctions as violations of intra-cylinder compression, changes in the fuel mixture ratio, incorrect ignition operation, and low-quality fuels and lubricants. The main problems in the operation of the power unit are the following:

the engine runs stably at minimum speeds, but stalls when the speed increases;
the start-up occurs normally, but the idle speed is unstable and stalls quickly;
won't start.

Electronic ignition circuit for a chainsaw.

Abnormal idle operation can be caused by various reasons. They can be divided into several positions:

reduced filter capacity (gasoline and air);
abnormal operation of the ignition system:
the carburetor settings changed spontaneously;
malfunction of fuel line elements;
exhaust channels and muffler are clogged;
defects of the piston, cylinder, valves.

READ Chainsaw Chain Partner 350 How many Links

Repairs should begin with an external inspection and checking the presence of fuel in the tank.

STIHL 180 chainsaw stalls at idle

Any tool can break and chainsaw is no exception. Now let’s try to understand questions such as: why does the chainsaw stall when the speed increases, also at full idle. Let's look at options for diagnosing and eliminating defects associated with this behavior of the STIHL 180 chainsaw.

Let's say the chainsaw operates normally at idle, but when you press the gas sharply it stalls. What is the possible reason? It’s immediately clear that the problem is not the ignition (lack of spark), because if the ignition was faulty and there was no spark, the tool simply would not start. This means the fuel system remains.

There are enough defects in the fuel complex of accounting programs, and in order to determine a clear reason why STIHL 180 chainsaw We advise you to read about common malfunctions of the STIHL 180 chainsaw and the elimination of these defects.

The first thing you need to check is the fuel filter.

Sometimes, a filter clogged with dirt is unable to pass through the fuel mixture in sufficient quantities. Accordingly, a lack of fuel appears in the system, which leads to the fact that when you press the gas of the chainsaw, the fuel burns out, and new fuel does not yet have time to arrive and, as a result, the STIHL chainsaw stalls. Also, if the fuel filter is clogged, there may be a noticeable drop in the power of the chainsaw at high speeds, but this is only with minor contamination.

On the Internet, you can find information that chainsaw may stall due to severe contamination of the air filter. I would like to refute this incorrect information and say that the STIHL MC 180 carburetor is equipped with a compensator, which is designed and installed to take in the air necessary for the normal operation of the STIHL 180 chainsaw, bypassing the dirty air filter. Naturally, the power with a clogged air filter will drop a little, but it certainly won’t stall The power may also drop due to piston wear; here the STIHL MS 180 piston chainsaw will need to be repaired.

Characteristics and possible causes of failure. Fixing the problem yourself

Chainsaws are quite reliable and lightweight in design. Therefore, if you properly care for them and treat them based on the manufacturer’s advice, then they fail very periodically and various types of breakdowns are quickly eliminated. But if you are facing this situation and want to repair your own instrument yourself without taking help from experts, then let’s dive into the information provided below.

In fact, it is impossible to clearly and accurately determine the reason why the tool does not start or it stops when you press the gas, because there are quite a lot of reasons for this. But we should not forget that, since the chainsaw is equipped with a conventional two-stroke engine, conditions such as lubricants, fuel, sparks and air are important for its efficient operation.

Chainsaw fuel tank

It follows that the carburetor is specially engaged in making the consistency of the fuel and air filter, the filter removes dust from the air, the ignition unit and spark plug make the spark, and gasoline contains the lubricant.

That is why it is necessary to look for the circumstances of such a disorder one by one, starting from the mild ones and gradually moving to the complex ones. And this is a fundamental factor in proper repair, because a person who, without thinking, begins to analyze a carburetor, is putting it at risk. Because this kind of
unit must be repaired or adjusted directly in special workshops (Read about carburetor adjustment).

It is important that for trouble-free operation of the tool you need to be quite careful with the fuel itself . Because if this mixture is not prepared correctly, most chainsaws simply will not start. Therefore, every owner will guess to look for the cause of fuel failure. That is why, in order for your tool to always work correctly, you need to use only high-quality gasoline for the mixture.

READ The Better Way to Cut Plastic Skirting Boards

Muffler inspection and repair

Clogged mufflers should be left to soak in warm water and detergent, then wiped thoroughly and dried.

A malfunction of the muffler leads to a drop in the power of the tool during operation and stops in idle mode. Despite the apparent simplicity of this detail, it is also important to keep an eye on it. Quite often the muffler becomes clogged. During operation, it is possible that wood dust, sawdust, and resin particles may get on the grate. High temperatures cause them to stick and accumulate; exhaust gases also form deposits on the surfaces of the spark arrestor and other parts. The layer that increases over time reduces the throughput of the muffler and interferes with the normal removal of exhaust gases. The engine, figuratively speaking, is choking.

Repairing this unit is not difficult and is within the capabilities of many tool owners. The device should be removed from the engine, the holes should be covered with a rag or other material. If the resulting layer is too hard, all parts can be left to soak in warm water and detergent. After the plaque has softened, the parts should be washed with a rag or soft brush and wiped thoroughly. Inaccessible areas can be blown with compressed air or dried with a hairdryer. The use of mechanical means of removal is not advisable.

For normal operation of the muffler over a long period of operation, you should use lubricants recommended by the manufacturer, monitoring their expiration dates. The mixture must be prepared immediately before work and consumed completely.

The chainsaw stalls when you press the gas: why and what to do?

Any equipment that uses an internal combustion engine running on gasoline as a power unit will sooner or later have operational problems. There can be many reasons for this: from low-quality fuel to breakdowns of “tired” parts. And today we’ll talk about what to do if the chainsaw stalls.

Stalls when you press the gas

If the engine stalls when gas is added, this may be due to the following factors:

clogging or incorrect carburetor settings;
air filter contamination, due to which the engine does not have enough air to gain speed;
clogging of the fuel filter, which contributes to the supply of insufficient fuel mixture;
malfunction of the cylinder-piston group. If there is insufficient amount of oil in the fuel mixture, excessive friction of the piston against the cylinder walls occurs, which leads to overheating and the formation of scoring.

In case of overheating due to insufficient oil in the fuel mixture, the engine will need to be overhauled, which is one of the most unpleasant consequences. To properly adjust or clean the carburetor, you should take it to a specialist, since lack of experience working with small parts can lead to damage to the mechanism. You can check the air and fuel filters yourself.

It is important to know! The fuel filter must be replaced every 3 months during daily use of the tool.

If the chainsaw does not allow you to develop speed when you press the gas, then it is advisable to try replacing the fuel mixture in the tank, especially if it has been in the tool for a long time.

Basic malfunctions and ways to eliminate them

The tool must be used in accordance with the instructions supplied with it. The start button should be turned on only after the chain tension and the presence of the fuel mixture and oil have been checked. Having secured the chainsaw securely in your hands, you can begin 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 equipment for repairing a chainsaw is suitable: various screwdrivers, socket and wrenches, hexagons.

Chain oil leaking

Every tool owner will face this problem sooner or later. The cause of this malfunction is a violation of the tightness at the junction of the oil pump and the hose from the oil tank.

To fix this problem, you will have to almost completely disassemble the chainsaw.

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

If the chainsaw does not start

If you believe the experts, then in case of such a problem, the first thing you need to do is simply open and close the cap on the gas tank. After this, you need to ventilate the combustion chamber, and also remove and dry the spark plugs. These actions are often enough to get the tool started and working. If the malfunction remains, then the cause should be sought elsewhere.

The fuel supply is affected by the breather. Therefore, if it becomes clogged, a vacuum forms in the fuel tank and the saw does not start. Repairing the breather is very simple - it should be cleaned with a needle.
The Shtil 180 chainsaw may not work due to a broken cylinder. If there are chips or unevenness on the cylinder, then this is the reason.
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 may be clogged with any deposits that occur during operation during the exhaust process.
The saw may not start well due to a faulty starter. To look at it, you should remove the cover from the carburetor and twist the special screen located behind the chainsaw drum. If the contact wire has come off the starter, it must be attached using a blowtorch. If the problem lies in an oil leak, then simply wipe the starter with a cloth.

The chainsaw engine runs intermittently

The cause of such a malfunction may be a breakdown of the cylinder-piston group, which can be easily repaired with your own hands.

To remove the cylinder from the tank, you need to unscrew the four bolts on its head. Then carefully check the piston, which should not have any burrs, scratches, or chips. If any are present, the piston will need to be replaced.

The optimal pressure in the combustion chamber is ensured by the piston and piston rings, which must fit fairly tightly on the piston body. If the piston inserted into the cylinder has free movement when rocking, this indicates its wear.

This defect can be eliminated by boring the cylinder and installing repair parts. However, the easiest way is to simply replace the entire set of CPGs.

Switches off when under load

Often powerful chainsaws stall from the load. Most likely your fuel filter is clogged and needs to be replaced. If this does not help, then you need to check the quality of the fuel mixture and prepare a new one.

Carburetor not adjusted or clogged

Problems with the operation of this unit are indicated by the saw stopping at idle.

The carburetor malfunctions in the following cases:

clogged jets, nozzles, channels or filters;
wear of oil seals, cuffs, gaskets;
incorrect adjustment.

Filters are clogged

In this case, the saw runs idle, but when you press the gas it stalls. Most often this is caused by the use of low-quality gasoline. A clogged filter interferes with the flow of fuel to the engine, so the saw stops under load.

One of the important parts of the tool is the air filter. The performance of a chainsaw depends on its cleanliness and correct choice, which directly depends on the operating conditions of the tool:

Cotton filter - installed on tools that are used with a saw in the warm season in dry air.
The HD 2 filter is intended for use of the tool in winter or in dusty conditions (for example, during large-scale logging). Such parts are often equipped with professional tools.

Stalls at idle

If the chainsaw has difficulty starting and stalls at idle, then the first reason is a clogged muffler. The muffler should be dismantled and then wet cleaned. This is very important, since dry cleaning can cause dust to enter the lungs, which will lead to serious problems with the functioning of the respiratory system.

The second reason that the chainsaw stalls at idle is incorrect carburetor settings. To keep the chainsaw idling, tighten the screw called L on the carburetor. If the tool stalls at idle, then the screw should be turned 0.5 turns clockwise. To accurately adjust the carburetor, it is recommended to use a tachometer, and the adjustment technology is described in this article (link).

Check the filters

If the saw does not receive enough air or fuel, it will naturally stall when trying to increase the speed or even just at idle. Checking for filter contamination is done purely visually. If there is a suspicion of problems with dirt, the filters need to be changed.

Read also from the section

Agriculture of New Holland

New Holland Agriculture New Holland is a global brand of agricultural machinery manufactured by CNH Industrial. New Holland's agricultural products include tractors, combines, balers, forage harvesters, self-propelled sprayers, hay tools, seeding equipment, hobby tractors, trucks and implements, and grape harvesters. The original New Holland Machine Company was founded in 1895 in New Holland,

Carburetor repair, maintenance - setup guide

Your Briggs and Stratton carburetor is an integral part of your small engine, so keeping it running smoothly is important to the overall health of your lawn mower, snow blower and other outdoor power equipment. In this article, we'll give you carburetor maintenance and repair tips that will help keep your little engine running smoothly so you can use it without problems.

Ryobi RY253SS Review

Pros / This gas trimmer has an 18-inch cutting radius. Cons / This trimmer weighs just over twelve pounds. Verdict / Ryobi RY253SS. it is an affordable, versatile tool that can support multiple attachments. The wide cutting path makes it a good choice for most yards, but for longer jobs you may feel the strain due to the somewhat uneven weight distribution.

STIHL chainsaw stalls reasons

Crankshaft bearing failure

If the bearings are defective, a slight play is felt. To identify it, the flywheel of the STIHL MS 180 saw is swayed from one side to the other.

READ Grinder DVT 125 With Speed Control

The movement indicates that the flywheel is being moved towards the electrodes by its own magnets, as a result of which there is no spark. To remove the mechanism, dismantle the cutting element, remove the filter and clutch cover.

To lock the crankshaft, remove the recoil starter cover and tighten the two bolts.

The clutch is unscrewed clockwise using the key. Remove the drum with the sprocket, replace the old clutch and tighten it until it stops. 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 wound in, and then removed from the brake.

Bearings with defects are less often detected (the diameter of the holes in the cage is increased). To determine, disassemble and measure using a micrometer. Broken bearings are indicated by regular knocking noises. In this case, urgent repairs are required, because if the integrity of the crankshaft is damaged, the piston group and cylinder will fail.

Why does it stall at idle?

The first and most common cause of this malfunction is incorrect carburetor adjustment. There is an option to adjust the idle speed without the help of others; for this purpose you need to have a STIHL adjusting screwdriver, which is supplied with the unit. The adjustment hole is located on the right side of the STIHL 180 saw on the handle and is marked with “-” and “”.

If a STIHL chainsaw does not maintain speed and stalls at idle, there is, of course, 90% certainty that it has a malfunction in the fuel pump system, usually this is air leaking into the crankcase through the pan gasket, or, more often, through the crankshaft oil seals. The air intake reduces or completely stops the pulse, which is supplied through special channels to the fuel pump of the chainsaw. Upon completion of this, the STIHL 180 chainsaw does not receive the required amount of fuel and stalls at idle.

Diagnostics can be carried out using a special device called a vacuum gauge.

Chainsaw Partner 350 Carburetor Settings

How to set up a Partner 350 carbureted chainsaw Repairs and country construction cannot be done without the use of a chainsaw, this is true even when caring for a garden. If the tool is faulty, it will cause all the work, so it is important to have self-testing and troubleshooting skills. If you have some experience, you can make adjustments to the carburetor, this procedure […]

Replacing the piston

Method of action for replacing and installing the piston:

Prepare a hammer, a wrench, a huge flat-head screwdriver, a set of sockets and wrenches, and a compressor to clean the accessories.
Remove the top protective cover.
Unscrew the spark plugs.
Remove the side cover.
Remove the plug from the shock absorbers.
We secure the crankshaft with a cord, unscrew the clutch and flywheel nut.
Removing the chain drive sprocket.
Removing the carburetor, ignition module and exhaust system.

After which you can dismantle the piston mechanism.

The chainsaw does not hold idle speed - search for causes and repairs

The serviceability and efficiency of household and professional chainsaws largely depend on the degree of wear of their main operating mechanisms.

Damage to the working components of a gas-powered tool is indicated by several factors, the main one of which is the speed of the running engine.

Their arbitrary increase or decrease can tell the operator about a carburetor breakdown, a violation of the clutch clearance and other malfunctions - this will allow any of the breakdowns to be identified in time and eliminated on their own.

Why does the chainsaw stall at idle? – Metals, equipment, instructions

The serviceability and efficiency of household and professional chainsaws largely depend on the degree of wear of their main operating mechanisms.

Damage to the working components of a gas-powered tool is indicated by several factors, the main one of which is the speed of the running engine.

Fuel supply

After unscrewing the spark plug, a wet coating is found on its surface. This indicates an excessive supply of gasoline to the combustion chamber. For this reason, the tool does not work or stalls, because the fuel does not ignite.

Another inhibitory 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, the following steps are carried out:

remove the candle;
pour 2 cubes of gasoline into the hole of the candle with a syringe;
put the ignition device in place and put on the high-voltage wire cap;
the lever is moved to the hot start position;
pull the starter handle a couple of times.

If the tool starts and immediately stalls, then the fuel line is tested further. Check the gasoline filter, splashes from the engine crankcase, and the integrity of the partition in the pump when unscrewing the cap.

Checking and repairing filters

The engine may run rough or stall if there is not enough fuel or air. Causes: clogged air or fuel filter.

To check the fuel filter, you need to remove the fuel line hose from the carburetor fitting and direct it into a container. Then press the fuel pump several times. If the fuel is pumped normally, in clearly defined doses, without dirt, then the fuel filter is working properly.

If the stream is weak or fuel is not pumped at all, the filter needs to be replaced or, if possible, cleaned.

Clogging of the fuel filter with sawdust is one of the reasons for chainsaw breakdowns.

The device must be removed from the fuel tank (after draining all the fuel from it). On most models, the fuel filter can be pulled out with a wire hook through the neck.

Why does the saw stall at idle? It is also possible that the saw chain is too tight. If the filter design is dismountable and can be cleaned, it must be disassembled and washed in accordance with the manufacturer’s recommendations.

Otherwise, replace it with a new filter.

Similar problems can arise when the air filter is clogged with dust, sawdust, or dirt. If the chainsaw stalls when the chainsaw stalls when idling. If there is insufficient air, the fuel mixture will be enriched and the fuel combustion process will be difficult.

To check, remove the filter. During operation, precautions must be taken to prevent dust from entering the carburetor. The device must be cleaned and rinsed in warm water with added detergent.

chainsaw STIHL 180 idling STIHL 180 running until chainsaw STIHL-ms180 not. After drying, if possible, blow with low-pressure compressed air and reinstall.

If the chainsaw works normally, then the cause has been eliminated; if not, you need to look further.

If the tool is used continuously, it is recommended to replace the filters of the fuel and air systems after 3 months.

Carburetor

One of the reasons why a chainsaw does not develop speed when you press the gas, but rather stalls, is a malfunction of the carburetor. Let’s say the STIHL 180 saw worked properly, but in the end it was installed for a long time and was not even used.

After starting it, it works fine at idle, but when you press the gas it can stall. Why does it stall? The reason is a stuck carburetor valve nozzle. This is not 100%, but the possibility of such a malfunction is extremely high.

We recommend reading the article about the design and repair of the STIHL 180 carburetor.

To check the injector, you need to remove the carburetor and disassemble it. To remove, you need to unscrew the two nuts securing the air filter and the carburetor, then remove the air filter and the engine control lever, while disconnecting the air damper control rod from the carburetor. Next, you need to slightly pull the carburetor towards yourself and disconnect the fuel supply hose.

The STIHL MS 1800 chainsaw is idling. The chainsaw stalls and the speed cannot be adjusted

Sources:

https://booktube.ru/benzopila-shtil-180-glohnet-na-holostyh-oborotah/ https://yasenevo-flowers.ru/sadovaya-tehnika/benzopila-shtil-glohnet-prichiny.html https://metallob .ru/pochemu-gloxnet-benzopila-na-xolostyx-oborotax.html

Malfunctions of the Ural chainsaw and how to eliminate them

When repairing a Ural 2t chainsaw, it is possible to eliminate any faults, including replacing the crankshaft, piston system, etc. Let's skip major and medium-sized repairs, and consider minor ones, which any untrained user can do.

Starts and stalls: what is the reason

There can be many reasons. But they always start looking from the simplest:

The fuel tank is running low.
The air filter is clogged with dust. A mixture that is too rich enters the combustion chamber and there is not enough oxygen to burn it out completely.
The breather - a tiny hole in the gas tank cap - is clogged. A vacuum is created in the tank, and gasoline is not pumped into the carburetor. The breather is cleaned with a thin needle.
The fuel filter at the bottom of the tank is clogged. It is pulled out with a wire hook along with the fuel hose attached to its fitting. But before doing this, you should remove the fuel supply hose from the carburetor. If gasoline flows out of it in a full stream, then the breather, hose and filter are clean.
Carburetor misadjustment. The fuel supply adjustment screw (not idle speed) is unscrewed a quarter of a turn and changes in the operation of the internal combustion engine are checked. If it gets better, unscrew it another quarter turn. If it gets worse, they twist it back. In any case, you need to remember how much the screw was unscrewed or tightened. It is better to adjust with the engine running and warm.

Repair and adjustment of the carburetor from the Ural 2T Electron chainsaw are presented in the following video:

Further problems with fuel supply are more serious:

the carburetor holes, filters, and channels are clogged;
The carburetor membrane has become unusable.

Diagnosing these problems will require disassembling the carburetor.

For reference: the Ural 2t Electron has a KMP 100 carburetor. There is experience when instead of it they installed a carburetor from the Chinese Viper Activia moped and even from the IZH Planet motorcycle. The difference in the volume of fuel supplied to the combustion chamber is stopped by adjusting the fuel supply screw. According to reviews, the Ural 2t Electron works better than with the original carburetor. Non-original carburetors do not fit the mounting studs. They are installed through adapters made of thick gaskets.

Poor contact with the spark plug in the spark plug cap.
When the internal combustion engine is running, the cap heats up and contact deteriorates. The temperature of the cap is tested by touch only with the engine turned off.
With other problems with ignition, the internal combustion engine either does not start at all, or “fires” due to an adjustment failure.
The cylinder exhaust ports or muffler are clogged with carbon deposits.

At low speeds there are few exhaust gases; they only need to exit through a narrowed passage. When the speed increases, the passage is small and the engine chokes. For a visual inspection, remove the muffler or the entire cylinder head. Contaminated parts are soaked in gasoline or special complex solutions and cleaned.

Saw chain jammed

Poor lubrication can cause some or all of the chain links to become stuck. The gearbox or clutch may jam due to heavy blockage or mechanism failure. The internal combustion engine does not have enough power to turn the chain and it stalls. They try to reach it by hand, if it doesn’t reach out, they look for the reason.

Won't start, but there is a spark

If there is a spark, problems in the operation of the ignition system can only be due to misadjustment. Spark in the Urals 2t The electron should flash when the piston has not reached T.M.T. 3.66 mm. If the fastening of the ignition unit is loose and it turns, the ignition is interrupted. It is checked by matching the two factory marks on the block and the body. If there is a spark and the ignition is adjusted correctly, then the reason is the above problems with the fuel supply.

No spark on the Ural chainsaw

The prefix to the name of the Ural 2t Electron chainsaw indicates that this model uses non-contact electronic ignition. The previous Ural saw had a mechanical breaker. According to reviews, the electronic ignition unit is one of the weak points of this chainsaw. Its thyristors and transistors are filled with a monolithic compound and cannot be repaired.

The unit often fails due to overheating and when the engine suddenly stops at high speeds. Therefore, it is strictly forbidden to turn off the chainsaw with the “Stop” button or by removing the spark plug cap at high speeds.