home » Style » Chainsaw partner 350 is not gaining momentum. Why does the chainsaw stall when I press the gas: causes and solutions

Chainsaw partner 350 is not gaining momentum. Why does the chainsaw stall when I press the gas: causes and solutions

There are frequent cases when owners of chainsaws are faced with their breakdown and it does not matter at all what model of this kind of equipment, since the nature of the breakdowns is almost the same for everyone. Well, the chainsaw has stalled, and what's next? Undoubtedly, you can take the equipment to specialized services that will fix your "iron friend" for a fee. But as they say: why pay more?

After all, you can personally disassemble the tool and repair it, since the breakdown can be insignificant, and in the service you will pay a lot for this. But naturally, in order to bring the instrument back to life, you need to be able to understand the causes of its breakdown and how to troubleshoot it. So let's learn! In this article, you can find answers to questions regarding situations where the tool simply stalls after directly pressing the gas. So let's get started.

The main elements of chainsaws

Before starting to delve into the issues of breakdowns and repair of the tool, let's first figure out what the actual chainsaw consists of. First of all, I would like to note that this tool belongs to the category of equipment, the operation of which directly depends directly on the internal combustion engine.

Just as important is that chainsaws are equipped with a single-cylinder engine, and the work of which is carried out on such a fuel as gasoline. It is worth noting that, despite the similarity with other tools, it does not have a gearbox. And it is replaced by a kind of single-stage chain transmission, through which the movement of the chain itself (saw) is performed.

In fact, a chainsaw is a fairly simple design, but this does not prevent it from being reliable, practical and capable of fully ensuring immediate uninterrupted and cyclical operation even in rather difficult conditions. This tool consists of a huge range of certain elements "vital" for its correct and productive work. This is a carburetor, a direct chain tensioner, a tire equipped with a chain and other elements.

Characteristics and possible causes of failure. Fixing the problem with your own hands

Chainsaws are fairly reliable and simple designs. Therefore, if you properly care for them and handle them based on the manufacturer's recommendations, then they fail very rarely and various kinds of breakdowns are quickly eliminated. But if you are faced with this situation and want to repair your instrument yourself without resorting to the help of professionals, then delve into the information below.

In fact, it is impossible to unambiguously and accurately determine the reason why or stalls when you press the gas, as there are a lot of factors affecting this. But do not forget that, starting from the fact that the chainsaw is equipped with a simple two-stroke engine, conditions such as lubrication, fuel, spark and air are important for its effective performance.

Consequently, the carburetor is directly involved in the preparation of the fuel-air mixture, the filter cleans the air from dust, the ignition unit and the candle create a spark, and there is lubricant in gasoline.

It is also important that for the trouble-free operation of the tool, it is necessary to pay close attention directly to the fuel. Since if this kind of mixture is not prepared correctly, then most chainsaws simply will not start. Consequently, not every owner will guess to look for the cause of the breakdown in the fuel. That is why, in order for your tool to always work correctly, you need to use only high-quality gasoline for the mixture.
And also use only the oil that is made by the manufacturer of your tool. In addition, it is important to prepare this kind of mixture in the amount that you definitely use in one or two weeks, but not more (see).

Otherwise, overexposure of the mixture directly in the canister will cause it to lose all its octane properties and this will lead to significant problems with the tool.
Also, the cause of the breakdown can be a direct filling the mixture with a candle at the moment when the mechanism is started. In order to solve this problem, it is necessary to turn out and dry the candle, but remember that it should not be ignited in any case. Excess fuel must be drained through the hole (candle), wait 20-30 minutes, then install it in place and try to start the tool again.
The chainsaw stalls when you press the gas due to the fact that no spark. This can happen when there is no good contact between the tip of the spark plug and the wire (high voltage). However, if this kind of connection works correctly, but there is still no spark, then the ignition unit (electronic) is the cause. It is important to note that these types of spare parts cannot be repaired, so they can only be replaced.

Do not forget that by examining the candle, you can get significant information regarding the breakdown of the chainsaw. Since if its surface is dry, then the reason for this is a cylinder into which fuel is not supplied directly. That is why you will have to step by step check the entire range of its supply. If the candle is all black soot, then this means that the carburetor is not working properly, that is, it either supplies a lot of fuel or pours oil directly into gasoline.
If the chainsaw stalls when adding gas, then this means that fuel is supplied in insufficient quantities for the full operation of the chainsaw. This can be caused by both clogging of the carburetor (its jet) and contamination of the filter itself (fuel). Remember that the first node should only be checked by professionals, but you can clean the second one yourself.
In addition, the cause of failure can be filter (air) if it is contaminated with dust. But do not forget that each model has its own easily eliminated and characteristic features. For this reason, do not hastily start disassembling and repairing the instrument, but it is best to “walk” through the forums, where reviews of various owners are indicated in large numbers, so as not to make things worse.
Since, for example, a chainsaw stalls when you press the gas for a simple reason, namely, a simple clogging of the direct breather.

In order to solve this kind of problem, all you have to do is disconnect the (fuel) hose from the carburetor and pay attention to whether fuel is leaking from it. Since if the mixture flows in a full stream, this means that the breather is not contaminated, and if vice versa, then the cause of the breakdown has been found.
Here is another reason why the chainsaw stalls when you press the gas - muffler. It is this part that can interfere with the full operation of the tool in cases where it is directly contaminated with exhaust resinous deposits. To do this, you just simply need to clean it.
Quite often, the chainsaw partner stalls when pressed and the reason for this is cylinder-piston group. Since by examining them, namely the piston and cylinder, you can easily determine the cause of a tool malfunction, directly by replacing them. You can also make a direct bore of the cylinder itself relative to the dimensions of the new piston.

But if after inspection you find that both the piston and the cylinder do not have any damage, in this case the reason may lie directly in the rings (piston). For this kind of check, it is necessary to insert the piston into the cylinder and gently begin to swing it through the connecting rod. If suddenly you feel a backlash, then the rings need to be replaced, as they have already worn out.
Many people ask: why does the chainsaw stall when I press the gas? The answer may also lie in insufficient chain lubrication(see), as the oil line may leak, or the direct channels may simply be clogged. That is why pay attention to the chain, because if it is dry, then, without delay, begin to clean the channels that supply oil directly to the tool bus. After that, inspect in detail the parts where the oil pump fittings are connected to the pipes. But if you notice that the oil is leaking at the joints, or you find cracks on the tubes themselves, then in the first case, seal the leaks with sealant, and the tubes will have to be replaced.

First of all, what you should remember when purchasing this kind of tool is that certain saw parts must be replaced with new ones after their service life (passport) has ended. It is for this reason that the instruction should always be at your fingertips, since everything is described in detail there.

Such details include: sprocket (drive), tire, part of the system (anti-vibration), as well as the chain. Since you should not forget that if this “stuffing” is not replaced with a new one at the right time, then these worn parts will negatively affect the rest of the chainsaw. For this reason, check the depth of the direct tooth development quite often. Remember that it should not be higher than a week of 0.5 mm.

Summing up…

Definitely, every thing we buy has its own expiration date and sooner or later it breaks down, and it becomes a shame when the degree of its breakdown is so great that it cannot be repaired. But you must admit that quite often we are simply negligent about technology (see about proper operation and about that), and when it stops working, then we try to find ways to fix breakdowns, while turning to a huge number of services.

But remember that even though the equipment breaks down, we can extend its “life”. All that is needed is to simply take care of it, do a break-in after replacing parts (read how it happens here) and keep its parts clean and tidy. And then, of course, it will last for many more years. It is also important to use exclusively high-quality spare parts and "additives" (see). Then your equipment will work smoothly, and you will simply forget what repair is.

If the chainsaw does not start well and stalls, the productivity of the simplest sawing work is out of the question. Spontaneous failures are subject not only to budget-class instruments, but also to fairly prestigious models from leading manufacturers.

poor quality of component parts and entire assemblies;
unskilled care;
the use of low-quality fuel and oil surrogates;
illiterate operation.

Remoteness from maintenance services and the high cost of the provided repair services force the owners of failed tools to restore their performance on their own.

This option is possible only after the end of the warranty period. The difficulty lies in the fact that traces of dismantling of individual components and assemblies noticed by service specialists can become the reason for refusing to repair free of charge more complex and expensive parts.

The benefits of self-repair

Experts offer several search options - the causes of poor engine start or if the power unit stalls during operation. The recommendations are equally valid for household and professional grade chainsaws.

Owners with experience in operating chainsaw equipment use simple, time-tested intuitive troubleshooting algorithms, which allows you to quickly eliminate many failures and breakdowns directly in the process.

The success of the work is facilitated by knowledge of the design of the tool and the interaction of all its components, the availability of locksmith and repair skills and operational experience. These same abilities allow owners to use their chainsaw equipment with high efficiency.

Self-repair provides an opportunity for significant savings in material resources and reduction of downtime.

Determination of the nature of the malfunction

The main part of chainsaw failures of any class falls on fuel equipment. For the ignition system, this figure is an order of magnitude smaller. Stopping a chainsaw due to mechanical failures in the practice of domestic and professional sawing is even less common.

electrical equipment

Malfunctions of the ignition system are determined quite simply by checking the spark plug and adjusting the gap in the contacts. After checking the integrity of the wiring, the causes of failure should be sought in the operation of the electronic unit.

The absence of a spark on the contacts may be due to a breakdown of the noise suppression resistor located in the candlestick housing. To check its integrity, it is enough to connect the high-voltage wire to the candle directly.

Mechanical failures

The sudden stop of the chainsaw can be caused by a piston jamming in the cylinder or the destruction of the crankshaft bearing due to oil starvation or poor quality.

In the first case, the operability of the tool can be restored by pouring a few drops of engine oil into the candle hole. Repairing damage to the crank mechanism involves complete disassembly in a well-equipped workshop.

Elimination of fuel equipment failures

A simple analysis of failures and malfunctions shows that more than half of them are due to unskilled fuel system tuning. Upon closer examination, it turns out that the reasons for the situation when the engine does not start, does not gain momentum and stalls are almost the same.

In most cases, these are:

air leakage due to loosening of screw fasteners or destruction of the crankshaft gland seal;
jet pollution;
float valve leakage;
lift pump seal wear.

Signs of characteristic failures

If the saw engine does not pick up speed and stalls, does not develop power and stalls under load, there is most likely a lack of fuel or improper carburetor adjustment.

The list of possible causes includes contamination of the fuel filter or air intake filter element, too rich or lean gasoline-air mixture.

Signs of a rich engine running:

slow set of revolutions;
smoke from the muffler;
reduction in traction characteristics and excessive fuel consumption.

The chainsaw stalls when you press the gas - most likely the mixture is too lean.

A simple way to determine the quality of the mixture

The easiest and most affordable way to check the quality of the mixture is the central insulator of the spark plug. Brown color of any intensity indicates the correct adjustment of the carburetor.

The result of working on a rich mixture is the formation of black soot on the insulator, a poor mixture manifests itself as a pure white or light gray insulator.

If, after a normal start-up and warm-up, a fueled saw intermittently stalls during operation, it is recommended to eliminate the vacuum in the gas tank by cleaning the breather. The reason for the unstable operation of the engine may be condensate water that has entered the float chamber of the carburetor.

Shutdown of the engine in the operating mode

Alternatively, if the chainsaw heats up and stalls, troubleshooting should be sought in the carburetor settings or in the high-voltage circuit of the ignition unit.

When it overheats, the spark disappears or becomes so weak that its power is not enough to fully ignite the fuel-air mixture.

The engine also stalls when hot if there is a malfunction in the anti-interference resistance, which is located in the tip of the spark plug.

Engine stalls when going to idle

The malfunction is manifested by unstable operation in the operating mode and stalls at idle. The reason for this phenomenon, most likely in the suction of air between the carburetor and the intake pipe of the cylinder. The failure is eliminated by tightening the screw fastener.

The chainsaw engine turns off after reaching the maximum speed mode

The power unit stalls at high speeds due to non-compliance with the declared performance requirements of the electronic unit. Failure is more typical for Chinese-made budget chainsaws.

Reason for rejection may be:

lack of fuel mixture in the float chamber due to valve sticking;
clogged fuel filter or breather located in the fuel tank cap.

The power unit also stalls at high speeds due to a dirty air intake filter. The same signs are typical for a situation where the chainsaw started up in standard mode and stalled during the warm-up stage.

Fuel system setting

Qualified allows you to bring the power unit to a combination of maximum traction parameters and economical fuel consumption.

The success of the work is facilitated by pre-cleaning the air intake filter, warming up the engine to operating temperature, and performing adjustments in the sequence specified by the instructions.

The result of the correct adjustment of the carburetor is:

a quick set of revolutions without the “failure” characteristic of a lean mixture during a sharp gas supply;
no increased smoke from the muffler;
stable idle speed.

Non-standard failures

If a normally working chainsaw engine stalls when the tool is tilted to one side, you should open the gas tank cap and eliminate the hanging of the flexible fuel receiver.

Almost the entire range of Chinese chainsaws is more or less copied from popular models of European origin, so the design differences are insignificant. The above recommendations can be used if the Chinese chainsaw has failed.

The maintainability of Chinese chainsaw equipment has been improved due to the unification of the repair fund and the interchangeability of many components and parts with the same models.

Using a chainsaw makes hard work easier. But sometimes the chainsaw starts and stalls, the reason for this can be any. What to do? You have to choose: take it to the workshop to specialists or try to repair it on your own. We will try to help the reader understand the causes of failure, ways to troubleshoot breakdowns and give advice on the operation of chainsaws. In turn, it will be useful for the owner to familiarize himself with the factory instruction manual and the design features of his chainsaw. This information will help him correctly use and professionally repair the tool.

Characteristics of the internal combustion engine of chainsaws

The main malfunctions of chainsaws are associated with engine failures. As a chain drive, domestic and foreign manufacturers use single-cylinder two-stroke internal combustion engines. The design of the motor is simple. The ignition is normal, without the installation of capricious electronics. Chainsaw engines operate reliably in various climatic conditions. Fuel for a carburetor engine is obtained by mixing AI-92 gasoline and special oil. Since there is no oil pump in the design, the piston and cylinder are lubricated with a mixture of gasoline and oil. The saw engine develops power from 2 to 5 kW, and the crankshaft speed reaches 14,000 rpm. At such high speeds and loads, the requirements for oil are special. Use the oil specified in the instructions. When replacing oil with a conventional motor tool, the resource of the tool is sharply reduced. Remember that it is strictly forbidden to fill the tank with gasoline without adding oil.

Tools and materials

The design of the mechanical components of chainsaws is characterized by good reliability and maintainability. Almost all units and parts have free access. With the necessary equipment, they can be easily removed for repair or replacement. To disassemble and check the life support systems of the chainsaw engine, stock up on the following tools and materials:

a set of fitting and assembly tools;
socket wrench;
tester;
pressure gauge for measuring compression;
probes for measuring gaps;
needle;
sandpaper;
fuel mixture (gasoline + oil);
rag.

Classification of engine malfunctions

Before starting the chainsaw, it is necessary to check the condition of the saw part, fill the fuel and oil tanks. After checking, start running. If there are deviations or malfunctions in the drive, it is necessary to carefully inspect the saw motor. As a result of an external examination, make sure that all components are complete and intact, that there are no mechanical damages, gasoline and oil leaks. We point out the main malfunctions associated with poor engine performance:

Engine won't start.
It starts, but soon the chainsaw stalls.
Works unstable.
Stops working under load.
Loses its power.

Engine troubleshooting is carried out in the following main areas:

failure of the ignition system;
failures in the fuel supply system;
piston group failure.

Saw mechanisms need constant care, prevention and repairs.

Knowledge of the principle of operation of a two-stroke gasoline engine will help the operator independently determine the cause of the failure and quickly restore the operation of the chainsaw.

Troubleshooting on your own

If it is impossible to start the engine, it is necessary, observing the order, to perform the following actions:

Check for fuel in the tank.
Change the fuel if it has been stored for more than a month.
Check fuel filter. Disconnect the hose from the carburetor and observe the flowing stream. If gasoline flows freely, the fuel filter is not clogged. In case of insufficient flow, clean the opening in the tank cap or the filter.
Clean the air filter. The air filter can be removed for a test run.
Inspect and clean the muffler from burning.
Check the performance of the launcher. If necessary, repair the starter (replace the pulley, spring or cable).
Disassemble and clean the clogged carburetor.
Ring the high-voltage wire with a tester for the absence of a break.
Measure the gap between the flywheel magnets and the ignition module (should be 0.2 mm).
Remove the spark plug and inspect it. Measure the gap between the electrodes with a feeler gauge (normally 0.5-0.6 mm). By the appearance of the electrodes, we determine the nature of the malfunction. If the spark plug is dry, there is no fuel mixture flow. A working part flooded with gasoline indicates a poor-quality adjustment of the carburetor or the absence of a spark. To check for spark, connect the high voltage tip to the spark plug, place the skirt on the cylinder radiator and pull the starter cord. If there is no discharge between the electrodes, the spark plug must be replaced. The formation of deposits on the electrodes indicates a poor quality of the fuel mixture. The central and side electrodes should be cleaned with sandpaper.
No compression. The reason is the failure of the piston group. Measure compression. First you need to unscrew the candle. Then insert a pressure gauge into the bore of the cylinder and move the piston with the starter cord. The state of the cylinder-piston group (CPG) is judged by the pressure in the cylinder. It must be at least 8 atm. Low performance is caused by wear of the cylinder, piston, piston rings.

What to do if the engine stalls after starting?

We often observe a short operation of the saw after starting - the chainsaw stalls almost immediately. This malfunction has characteristic symptoms. The list shows the probable causes of the malfunction and how to eliminate it:

No or little fuel. If the failure occurs when sawing in an inclined position, then this indicates a rise in the intake tube above the fuel level. Check for fuel in the tank. Fill with gasoline to the required level.
Poor fuel mixture. Prepare fuel in strict accordance with the saw manufacturer's instructions. Completely replace the mixture.
Breather clogged. Low fuel consumption to the engine. A breather is a breathing hole in the tank lid. Clear the blockage with a needle.
Poor contact of the spark plug with the cap of the high-voltage wire. In this case, the porcelain insulator of the candle is very hot. Strip the contact and put the "cradle" tightly on the spark plug.
Faulty spark plug. Replace with a new one or a known good one.
Clogged muffler with combustion products (exhaust gas). The muffler needs to be cleaned.
Carburetor out of adjustment. To adjust the quality of the mixture, the carburetor has 3 screws: "L" - fine adjustment, "H" - coarse adjustment of high speeds and "T" - adjustment at idle. By observing the sequence of adjusting the screws, we achieve higher crankshaft speeds.
Air filter clogged. Air enters the carburetor in a small amount - we get an enriched mixture. The saw stalls with increasing load when sawing hardwood and large diameter trunks. Rinse the filter in warm water and dry.
Failure of the piston group. Replace defective parts.

Although the chainsaw is a simple device, from time to time malfunctions occur in its operation, which can only be eliminated by disassembling. The following faults are examples:

the chainsaw is not gaining momentum;
the chainsaw stops functioning in the cut;
the chainsaw starts and stalls;
the chainsaw loses its power;
chainsaw stalls when pressed.

Most often, malfunctions are associated with interruptions in the functioning of the motor, as well as with malfunctions of other systems and components. Proper handling of this technique is of great importance. When all the rules of use are followed, the problems with a high probability lie in the most obvious. When looking for the causes of problems, it is advisable to start by checking the simplest part of the chainsaw and end with the most difficult one.

Checking the main chainsaw systems

If the chainsaw refuses to work normally, you need to make sure that all the conditions required for its normal operation are provided:

fuel;
spark;
lubricant;
air.

Then it is necessary to sequentially check the functioning of all its elements. First you need to check the fuel tank. If the cause is not the volume or quality of the fuel, then spark plugs may be the likely cause of the malfunction. The gap at the candle should not exceed 0.5 mm. If it is too small, it means that soot has been deposited on the candles. In this case, you should remove the candles, clean them, then put them in place and try to start the chainsaw. In addition, it is advisable to completely replace the candles with new ones from time to time, even if they are in good condition.

Then you need to check the condition of the fuel filter and carburetor. Self-cleaning the fuel filter is a simple task, but carburetor repair is best left to specialists.

The chainsaw starts and stalls - the reason

If the chainsaw starts and stalls the first time you try to do the job, the cause may be a problem with the chain brake or the chain is jammed due to lack of lubrication. In this case, measure the oil level. If the volume of lubricant is sufficient, then the cause may be in the tube that leads it to the lubricating mechanism.

Another reason may be a broken carburetor. If he only needs adjustment, it can be done independently in accordance with the instructions. If the carburetor needs cleaning or repair, then you can not do without the help of professionals.

Another possible cause of this malfunction is the low level of fuel in the tank. In this case, the chainsaw stalls when tilted, because the rest of the fuel mixture is in the part of the tank opposite to where the suction tube is located.

Why chainsaw stalls when heated

It often happens that the chainsaw starts up cold, but stalls during the heating process. This tool behavior can be caused by the following reasons:

Carburetor not set correctly. You can identify this problem by how the device is started on a cold one. If it is done without closing the air damper, and the engine is started without a preliminary flash, then this means that after the engine has warmed up, the fuel fills the candle. The solution to this problem is to adjust the carburetor. Details about
Coil failure(ignition module). You can identify this problem by sequentially checking the spark, first on a cold and then on a hot engine. If there is no spark on a hot engine, then the ignition coil must be replaced.
Spark plug failure. In this situation, as with a malfunction of the ignition module, the spark disappears when the engine heats up. It is necessary to replace the spark plug with a new one, and if this does not lead to a solution to the problem, then the ignition module and the distance between it and the flywheel should be checked.

Why chainsaw stalls under load

Sometimes the chainsaw is unable to function properly under load. Most often this is caused by incorrect adjustment or leakage of the carburetor. In addition, the cause of this problem may be air leakage through the carburetor gasket or crankshaft oil seals. A tool that is unable to function under load also cannot confidently hold idle speed.

Diagnostics begins with checking the carburetor and crankcase for leaks. If air leakage through the crankshaft seals is detected, they must be replaced. If air leakage is detected in the carburetor, a gasket repair kit must be installed to solve the problem.

If these actions did not lead to the desired result and the crankcase with the carburetor is tight, then you need to adjust the carburetor.

If the Husqvarna chainsaw stalls under load, then for any deviations in the functioning of the motor, first of all, check the impulse hose, as this is the most common cause of failure of chainsaws of this brand.

What to do if the chainsaw stalls when you press the gas

One of the most common questions regarding the operation of this device: why chainsaw stalls when you press the gas and what needs to be done to solve this problem? In such a situation, you must do the following:

check the fuel filter;
inspect the fuel hoses for tightness;
check the muffler;
try to increase the speed a little;
check the condition of the rubber seals on the crankshaft.

Why the chainsaw does not gain momentum and stalls

If the saw cannot pick up speed or stalls when you press the gas, then this is most likely caused by a leak in the carburetor or crankcase. This problem is corrected by checking for leaks and adjusting the carburetor.

In addition, this malfunction may be associated with a defective fuel tank breather. Due to the formation of a vacuum in the fuel tank during the operation of the chainsaw, the required volume of the fuel mixture does not enter the engine, as a result of which it cannot gain momentum or stalls. If you stop the chain saw, open and close the fuel tank and turn it on again, it will run normally for about five minutes, and then again stop gaining momentum or stall.

Another possible reason that the chainsaw is not able to pick up speed may be an excess of carbon deposits in the muffler, which makes it difficult for exhaust gases to escape, which reduces the power and speed of the engine.

The Stihl 180 chainsaw does not develop speed, or after you release the gas trigger, it continues to work without dropping speed. These problems are quite common. Let's try to understand the reasons for the occurrence of such malfunctions. Also in this article we will consider how to diagnose if the chainsaw does not pull.

There can be several reasons for the lack of traction and a poor set of revolutions with a chainsaw. Therefore, you should not immediately start disassembling and repairing the carburetor, because the reason may not be hidden in it.

On the Stihl ms 180 chainsaw, a reliable carburetor is installed, on which the manufacturer has limited the ability to adjust the power and maximum engine speed, so when the chainsaw drops in thrust, the carburetor is the last place to look for problems.

Muffler

What is the first one, you ask? The answer is a muffler. The muffler is responsible for exhausting the exhaust gases and extinguishing the flame in them. All combustion products pass through it, which over time can clog it. The situation with a muffler clogged with soot is far from uncommon, but it occurs due to the wrong fuel mixture.

With a normal ratio of gasoline to oil, the combustion products are not so saturated with soot as to clog the muffler. In the event that the amount of oil is more than normal, excessive soot is formed during its combustion. Further, soot accumulates under the piston rings and in the muffler of the Stihl 180 chainsaw. Thus, a coked muffler is the most harmless thing that can happen, the maximum damage from excessive soot is the need to replace the piston.

How to check the muffler

To check the muffler, it must be removed from the chainsaw. To do this, using an 8 mm head, two fastening nuts are unscrewed and the part is removed.

Important: after the muffler is removed, it is necessary to check the integrity of the gaskets between it and the cylinder, since very often they stick and break when the muffler is removed.

You can clean the part mechanically, using screwdrivers or knitting needles, and then blow it thoroughly with compressed air. The seat on the muffler can be cleaned with sandpaper to remove burnt parts of the gasket.

Install the muffler in reverse order.

Important: when tightening the muffler mounting nuts, do not overtighten the nuts, as the threads on the screws can be torn off.

The second reason why the Stihl chainsaw engine can reduce power and not develop speed is a blockage in the fuel system. As a rule, the first place to start looking for a blockage is the fuel filter.

Checking the fuel filter

The fuel filter is installed in the tank of the Stihl 180 chainsaw, and it is not very convenient to pull it out. To facilitate the process, you can take a small piece of aluminum wire and bend it at the end, then use it to hook the fuel hose and remove it, along with the filter, from the tank. To check the filter, it is necessary to blow into it, if the air does not pass, then the reason has been found, and the filter must be replaced.

If the filter is clean, check the fuel hose for clogging. To check, it is necessary to disconnect it from the carburetor and, with the air filter removed, blow into it. If a blockage is found, the hose can be mechanically cleaned with a wire, and then blown with compressed air.

Strainer in carburetor

The last likely place for blockage to form is the strainer in the carburetor. In the diagram below, it is indicated by the number 13.

In order to clean the strainer, it is necessary to remove the carburetor from the Stihl 180 chainsaw. Work begins by removing the top cover of the saw, after which, using an 8 mm head, two fastening nuts are unscrewed. Next, the filter housing is removed from the guides, after which the air damper rod and the engine control lever are disconnected. Lastly, the fuel hose and throttle rod are disconnected, after which the carburetor can be removed from the guides.

The carburetor strainer is installed in the fuel pump chamber, in order to get to it, one screw securing the pump cover is unscrewed and it, along with the gaskets, is removed.

The mesh filter can only be cleaned with compressed air. Any mechanical methods are strictly prohibited, because the mesh is very soft and easily changes shape. When you press it, it is easily crushed and bends form along the edge of the seat, through which unfiltered fuel can enter the carburetor.

In the process of cleaning, the seat with the filter installed in it must be half covered with a finger and only then blown with air, otherwise the mesh may fly away and it will no longer be possible to find it.

Depressurization of the carburetor and clogging of the nozzle

Sometimes, when the screws securing the carburetor cover are loose or the gaskets become unusable, the chainsaw can also experience a loss of power, in order 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 parts from the repair kit for the Stihl MS 180 carburetor.

In the case when a complete check of the fuel supply and exhaust system has been carried out, but there are no results. The main fuel injector needs to be checked. To check, you need to knock it out of the carburetor body. All work must proceed according to the following algorithm:

The carburetor is removed from the chainsaw.
Four screws securing the cover with a compensator are unscrewed, after which the cover can be removed.
The carburetor is mounted 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 pick up a small hose, the inner diameter of which corresponds to or slightly less than the outer diameter of the nozzle and put it on the nozzle.
The next step is to blow inside the hose. If it blows only in one direction, the nozzle is working, if it blows in both directions or not at all, then the valve must be replaced.

All of the above steps should help in troubleshooting the fact that the chainsaw is not gaining momentum, otherwise, a full diagnosis at the manufacturer's service center will help.

Why the chainsaw does not slow down

There can be several reasons why the chainsaw does not slow down:

broken throttle spring
wedging of the gas trigger;
throttle linkage bent;
the corkscrew of the throttle shaft is lost, as a result of which it wedges.

It is not difficult to solve all these problems, you need to conduct a thorough inspection and accurately determine the cause, and then change the faulty part. As a rule, if the chainsaw picks up speed well, idles and has normal power, then the problem with not slowing down is purely mechanical. And finding and fixing a mechanical problem is much easier than identifying and stopping air leaks in the crankcase of a chainsaw.

Video

Calm 180 does not develop momentum, the video of the most common reason can be viewed below. In it, the owner of the Stihl ms 180 chainsaw tells his story of solving the problem with loss of power.

Conclusion

When the first signs of power loss (reduction in speed) appear with the Stihl MS 180 chainsaw, in no case should you continue to work, but you should immediately contact a specialist or diagnose and fix the problem yourself. There are not so many reasons for power loss and you can cope with them even without certain skills. The main thing is to calmly analyze the behavior of the saw and find out the reasons why it stopped pulling (speed dropped), and fixing the problem is already a simple matter.

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