How to remove the muffler of a Kraftsman chainsaw

Chainsaw repair with your own hands. How to Clean a Chainsaw Muffler How to Wash a Chainsaw

The problem when working on the dacha site during construction or repair can become a chainsaw malfunction.

After extended use, any chainsaw will have certain malfunctions that can be repaired with your own hands.

Despite the fact that the chainsaw is not a very complex, fairly reliable and accessible tool, breakdowns, its failure or interruptions in operation lead to unjustified time and expenses for repair or replacement of the tool.

Do-it-yourself chainsaw repair: malfunctions and troubleshooting

A chainsaw is a simple device that, with proper care, will last a long time. A saw is a tool that is exposed to different stresses and consequently breakdowns do occur. About what caused a particular malfunction and how to fix it, you will learn from this article.

Required skills and tools for repair

Most of the faults of gasoline chain saws can be eliminated with their own hands. However, this requires an understanding of the chainsaw structure and how the nodes function together. As for the tool, most often necessary:

To repair it yourself or to send it to a service center

It is worth understanding that not every problem can be solved by yourself. Not every chainsaw owner has a compressometer at home or a special device that allows you to create a vacuum and the right pressure, for example, to check the crankcase for leaks. In such a case, you cannot do without calling in professionals.

Troubleshooting Algorithm

If you’re sure you can reassemble the chainsaw after disassembly, a screwdriver is in your hands. To determine the true cause of the problem it is necessary to analyze the condition and the behavior of the saw.


In most cases the following problems are found in the operation of the engine:

  • The engine stops starting;
  • The engine starts, but after a while it stalls;
  • The engine is not able to develop the necessary power;
  • the engine is extremely unstable.

How to check the crankshaft oil seals

You can only check for leaking oil seals by getting to the crankshaft itself, and carefully examining it for leaks. For information on how to do this properly, see

How to check compression on a chainsaw

If the compression level is below 8 atmospheres, the engine will not have enough power, and therefore the chainsaw will not be able to function properly.

  • Remove the protective cap and unscrew the spark plug.
  • Insert the tip of the compressometer in the hole where the spark plug is to be located.
  • Use a starter cord to rotate the piston and memorize the maximum reading of the gauge.

How to correctly put the piston on the chainsaw

Work on the replacement of the piston for most models of modern chainsaws is carried out according to the following algorithm:

  • Remove the top and side covers.
  • The spark plug is unscrewed.
  • Stoppers are removed from the shock absorbers and the handle is detached from the body.
  • Remove the drive sprocket and starter motor.
  • put the piston stopper in the spark plug hole and undo the nut that fixes the flywheel and clutch.
  • The flywheel, clutch, and worm drive of the oil pump, located immediately behind the clutch mechanism, are removed.
  • The screws that secure the carburetor and air filter are loosened and the units are removed along with the engine control lever.
  • The ignition coil is removed, as well as the muffler.
  • Turn the saw over with the base plate upside down and remove the screws that fix it to the body and disconnect the engine.
  • Unscrew the drip tray and remove the piston.
  • As the piston can only be removed together with the crankshaft, the circlips must be removed in order to undo the piston.
  • Replace the old piston with a new one, but as carefully as possible. This is caused by the high brittleness of the compression rings.
  • The crankcase is put back in place and a sealant is used instead of the gasket.

All of the following actions are performed according to the algorithm, the reverse of disassembly.

Fuel system

Fuel system malfunctions are also often the main reason why a chainsaw doesn’t operate at its best. The first thing to do is check the quality of the fuel mixture.

Some owners prefer to use an alcohol-based solution instead of the recommended brand of gasoline, or add more oil than required.

Gasoline is leaking from the chainsaw

If gasoline drips periodically appear on the body of the chainsaw, it is necessary to check the tightness of the fuel tank. Over time, it may have dried out. Or the gasket is “swollen” and can no longer perform its direct function.

If full-fledged gasoline streams appeared, then there is a high probability that you will have to change the burst hose that connects the carburetor and the fuel tank.

No gasoline in chainsaw cylinder

There are several reasons why the fuel mixture stopped flowing into the cylinder:

  • The air filter is clogged.
  • The carburetor’s operating settings are off.
  • The carburetor membrane is no longer intact.
  • The ducts through which the gasoline is transported are clogged.

The chain saw does not hold idle speed

In this case, you should start looking for a malfunction with the filter elements. Most of the time it is the loss of air and gasoline filter capacity that causes the idle speed to “float.

Fixing your chainsaw by following the instructions. all you need to know

A chainsaw is an indispensable and reliable assistant in every household. The ease of use of the tool makes it even more popular, but you can never rule out the occurrence of various types of malfunctions.

When chainsaws have all sorts of faults, you need to have them repaired. It is possible to carry out chainsaw repair with your own hands, but first it is necessary to determine the fault.

The material will consider not only all kinds of faults, but also the peculiarities of their elimination.

Engine repair

The construction of all chainsaw models is similar. The main unit of any chainsaw is a two-stroke internal combustion engine, the operation of which powers the cutting element. the saw chain.

A starter is used to start the engine, and a carburetor is used to regulate the fuel and mix it with the air. In order to improve the efficiency and productivity of the tool, the chain and bar are lubricated when the tool is in operation. This is a separate system, the malfunction of which can lead to a number of negative consequences.

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Any element can fail, which will result in the inability to continue to use the tool to work.

When malfunctions occur, questions often arise such as how to repair a chainsaw, and what is needed to do so? First determine the cause of the malfunction and only then make the proper decision as to what to do.

If the chainsaw will not start, it is most often caused by a faulty carburetor. Rarely the cause may be a faulty starter motor or inexperience on the part of the person trying to start it.

Consider the main types of malfunctions of various systems, as well as features of their self-troubleshooting.

Chainsaw starter repair

What is the purpose of the starter, every 10-year-old boy knows, so it makes no sense to consider the purpose of this device.

it is necessary to tell that on petrol saws the simplest kind of a hand starter is used, which allows to start up the two-stroke engine by pulling the crank, connected by means of a cable to the clutch drum. A number of malfunctions of the starter can include:

remove, muffler, chainsaw

If the pulley is damaged it should be replaced with a new one.

If the spring is damaged in the place of its engagement with the slot of the drum, you can try to repair it, although in most cases it is not worth it, it is relevant only if you are far from civilization.

If the cable is broken, it must be replaced by removing the starter cover and carefully replacing. It is inexpedient to surrender the chainsaw for repair when the starter is malfunctioning, as it would be much cheaper to perform an independent repair or replacement.

Fuel system

The following types of malfunctions are distinguished in the fuel supply system:


You can also troubleshoot these problems yourself. The first thing to do is to disconnect the fuel hose and make sure that fuel is coming from it. If fuel does not come out, clean the hole in the cap with a needle. You should also change the fuel filter, which is recommended every 3 months.

If insufficient amount of fuel comes from the carburetor to the cylinder, the cause may be a bad ratio of fuel to air in the carburetor. It will be necessary to adjust the carburetor, which can also be done independently.

If fuel mixture comes out of the carburetor in large quantities, the carburetor needs to be cleaned and adjusted.

Important to know! Carburetor repair should be entrusted to specialists or resort to such work only if you have the appropriate experience.

Repair of the ignition block of a chainsaw

If the ignition system malfunctions, the unit can be repaired with your own hands. Failure of this system should begin to look directly from the inspection of the spark plug. The presence of moisture on the contact group indicates an overabundance of fuel. Then the carburetor needs adjustment.

Important to know! Dampness in the spark plug can occur due to prolonged starting the tool.

If there is fouling, it is necessary to clean the electrodes with a fine sandpaper (nulling). The cause of the fouling is often a faulty petrol/oil ratio. Spark check is required.

If the spark does not appear, then the spark plug must be replaced. Depending on the technical requirements it is a good idea to replace the spark plug.

Troubleshooting the ignition system does not require special skills, so you can resort to removing them yourself.

Repair of piston group

At suspicion of failure of cylinder-piston group (CPG), it is necessary to carry out inspection of its condition. To not disassemble the mechanism, it is enough to unscrew the muffler and look through its window. To check the performance of the piston and crank mechanism can be checked by measuring the compression.

The compression meter is installed in the spark plug hole, and then you need to crank the crankshaft with the starter. The optimum value of compression for normal engine operation is not less than 0.8-0.9 MPa.

Measuring the compression allows you to determine the wear of piston rings, and then if necessary to carry out their replacement.

How to clean a chainsaw muffler

Everyone who is not an aversion to their own chain saw, should understand once and for all that oil is only in the Russian proverbs, and in chainsaws, there is a suitable oil and not suitable. Everyone wants to save, but saving a few hundred on engine oil (by buying not the usual company synthetic for 500, and some Chinese junk for 200), you can for a couple of hours of work to destroy the piston, the price of 80% of the price of chain saw.

The same goes for chain and bar oil. The real savings with bad oils are less than the lost profits after a chain and bar failure.

In addition, for domestic use, even the most precious oil is not an item for meaningful savings.

Running in a chainsaw

The real running-in at idling speed is needed only for ugly chainsaws, for ordinary chainsaws, for example for STIHL chainsaws, during the first few filling fuel is recommended to gas only under load, and in the manual to the chainsaw Husqvarna is stupid advice “Avoid running at very high speed during the first 10 hours” (where the rpm controller remains a mystery) and no way to work out a few tanks at idling speed is not involved.

It is also better to avoid buying chain saws, which openly indicate the need for a long (more than an hour) running-in at idle speed, because it is apparently a condition for the lead to refuse warranty service, they say: Do you run-in?? No? Well, that’s a violation of operating conditions.

Storing a chain saw

  • After work, any chainsaw should be cleaned of sawdust, especially the area where the bar is attached, so that water does not accumulate and corrosive substances do not create
  • Chain oil is better drained when storing for more than a few days, because the tank is not airtight and the oil can leak out. It is not unsafe and there is no need to plug the holes, and it does not affect the chainsaw’s performance.
  • In the case of prolonged storage you need to empty the fuel tank completely, put the saw into gear and wait until the fuel runs out. The oil in the fuel system decomposes and carbonises and if the saw is parked for more than a month, the carburettor channels and / or diaphragms can get caked and then the carburettor can get burnt.

STIHL ms 180 chain saw repair, muffler cleaning

Fouling in the muffler may be one of the reasons why a chainsaw stops. In the case of a muffler not disassembled.

Partner no power. Chainsaw repair.

It’s a pretty common problem that the chainsaw has no power. What do I do if my chainsaw has no power?? Of course, the reason why the muffler.

Tire Care

Every few hours of operation the tire needs to be rotated 180° so that both sides are working out, about the same.

Also, every time you fill up the tank, it is necessary to lubricate the sprocket bar to make it serve long and normal, for which almost all stores sell special syringes to lubricate the sprocket. The only manufacturer to solve this problem is STIHL with its Ematic

Very often you hear the advice to level out the “indented groove” on the guide rails with a file, however, if the tire is from a normal manufacturer, then “finishing with a file” will not work. What’s more, if you don’t keep a perfect right angle between the file and the bar, the “fixed” bar will last even less because the chain will wobble in the bars and break them even more during operation.

Cleaning chainsaw after use

Every time after work it is necessary to clean chain saw from sawdust, clean and, preferably, wash the oil pump. It should be done immediately after use, because if a dirty chainsaw is left for a couple of weeks, it will be a real hassle to clean it off.

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Muffler cleaning

If a chainsaw starts to cut off at engine rpm, usually after several years of operation, one of the reasons may be a clogged muffler. It is easy enough to remove and wash it, and you can use the appropriate chemicals.

Cleaning chainsaw engine

All custom cleaning of the engine should be limited to cleaning the radiator from any impurities, if by cleaning the engine means taking apart the engine and cleaning the internals, it is better without experience not to get into it, because to kill a lot easier than to repair.

Malfunction of the carburetor

If all the above actions were not successful, the chainsaw malfunction may be due to a faulty carburetor.In this case it is checked and corrected. However, if you don’t have experience doing this kind of work, you should seek it out a friend or a professional who knows how to do it. Otherwise, you run the risk of losing your saw. Carburetor. this is a device made up of many very small parts that could fall out and get lost if not operated properly.STIHL MS 250 carbide saw repair video, below (click on the triangle to play):

Chainsaw muffler malfunction

Often during continuous operation, the walls of the exhaust pipe are covered with soot, which prevents the exhaust gases from escaping freely.In this case, remove the muffler (if possible) and wash it with detergents, then dry it thoroughly with a hair dryer.WARNING! The soot contains carcinogens. It can get into your lungs during chemical cleaning, endangering your health.The cause of soot is usually the wrong ratio of gasoline oil or the use of low-quality and incompatible oils.Read the chainsaw’s instruction manual carefully to prevent this from happening again.

Faults in the cylinder-piston group

Deterioration of the cylinder and piston, scratches and clogging of their surfaces, wear of piston rings or crankshaft bearings. All this is very serious damage. These cause the cylinder pressure to drop. In this case it will be very difficult to start the engine.Without understanding, check the CPG status as follows. Remove the muffler and look at the open window. Part of the cylinder surface will be visible. To obtain CPG status, the compression in the engine is measured with a compressor, which must be installed in the spark plug hole. Turn the crankshaft (can be run) to measure the gauge. Compressor reading should be at least 8-9 kgf/m2. (or 0.8-0.9 MPa).If there is no compressor, you can assess the presence of compression simply by sliding the hole in the socket and pulling the starter as shown in the photo below:If compression occurs, you will feel a finger being sucked in.Low compression may be caused by coke piston rings or wear and tear.

Chain lubrication system malfunctions

Every owner’s manual points out the need to check the condition of the chain lubrication system.The system usually malfunctions due to clogged passages through which oil flows. If there is a small oil leak, the operation can continue. But if the oil leak is big enough, you need to check the piping for leaks in the pump fittings. You can fix the leak by sealing or replacing the pipe.You should also look at the condition of the oil pump. If there are cracks in its housing, it must be replaced.A video on repairing the oil pump is shown below:

Brake circuit malfunction

If the brake does not work, the brake band may be contaminated with grease, sawdust, or resin.You can fix the problem by cleaning out the dirt and replacing the brake band.As you can see, chainsaws can be caused by a variety of reasons. During operation, try to follow the instructions in the instruction manual and carry out periodic maintenance to keep the chainsaw in good condition.

Check ignition system

The first thing to do if the chain saw breaks is to inspect the spark plug by disconnecting the wire and carefully turning it out with a spark plug wrench.

  • dry. The fuel mixture is most likely not getting into the cylinder. It’s not the ignition system, so screw the spark plug back on;
  • Very heavily spattered with fuel. the reason for the excessive fuel mixture is either a misfiring or improper carburetor adjustment. Wipe the spark plug thoroughly, turn off the fuel and turn on the starter to remove the excess fuel and air out the combustion chamber. Then the spark plug is put back in place and the machine is restarted;
  • is covered with black carbon deposits. This could indicate the use of low-quality oil, a misadjusted carburetor, or an incorrectly calculated ratio of gasoline to oil. Clean off carbon deposits with a sharp object (an awl or a needle), rub the electrodes with a sandpaper and replace.

To be absolutely sure, you should also check the presence of the spark. To do this, put the ignition cable on the spark plug, use pliers to connect the spark plug nut and the cylinder, start the starter and watch for sparks. If it’s missing. the spark plug needs to be replaced. If the new spark plug also does not produce a spark. the problem is in the high-voltage wire or a violation of the connection with the spark plug.

  • To begin with we need to drain away the rest of the fuel from the tank. Remove the chain saw cover by unscrewing the fasteners. How to dismantle chainsaw quickly and accurately? They should be cleaned with an emery cloth. Take out the filter and disassemble the housing, removing nuts and clamps as needed.
  • Take off the hose of fuel consistence from its holder, unscrew the fasteners of the upper cover of the carburetor. Then we remove the upper cover and the blue gasket. this is the diaphragm of the fuel pump. On the left side of the housing there are spring clips, remove them and then the screws. It is better to sign the parts and schematically fix the places from which they were removed, so as not to confuse anything at the time of assembly.
  • Take off carburettor bottom lid, unscrew screw and take out needle valve and spring under it. Then take off the choke and its axle by pulling it lengthwise.
  • Let’s remove throttle flap, throttle drive arm and throttle axle.
  • All removed carburetor parts are spread out on a smooth surface and examined for intactness. Do not know how to adjust and a clear example in the video chainsaw in. Parts with the highest degree of wear should be replaced with new ones.
  • Using a special cleaner wash the parts and dry them with a lint-free cloth. The tubes should be blown under pressure with a pump.
  • To merit the greatest effect to clean the carburetor on a STIHL chain saw, you can use a special tub cleaner, based on the cavitation effect. The bathtub is filled with diesel fuel, and carburetor parts are immersed in it for a couple of minutes. How to Clean a Partner Chainsaw. In this video I told you how to install a non-standard carburetor on chain saw Druzhba 4 ! Finally we dry the parts with a pump.

Troubleshooting your chainsaw

Unfortunately chainsaws, just like other machines, can also malfunction. At least a little understanding how the saw works, you can fix most of the problems with your own hands. The complexity of the repair is not so much in the work itself, as in the correct determination of the causes of failure.

A Quick Chainsaw Muffler Modification

For example, if a chain saw does not start, there can be several reasons for this, so you should not immediately start dismantling it. First, analyze the causes of failure, which are divided into 2 groups:

  • Malfunctions of engine nodes, ignition system, fuel supply or exhaust. This also includes malfunctions of the cylinder. piston group.
  • Failures in the lubrication system assembly, chain brake, clutch, or tire, as well as a number of other malfunctions.
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Indicators of engine trouble

Engine malfunction can be judged by the following problems that occur:

  • impossible to start the engine;
  • engine starts, but then immediately, stalls;
  • The engine runs erratically;
  • it operates normally at idle, but under load it loses power or stops.

All of these problems can indicate a malfunction in the ignition system.

remove, muffler, chainsaw

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Checking the ignition system

You should start checking the system by inspecting the spark plug. Dry, it indicates that the fuel mixture has not entered the cylinder and therefore the ignition in this case has nothing to do. If the spark plug is too flooded with fuel mixture, then the saw was not started correctly or the carburetor is not properly adjusted.

Wipe the plug thoroughly, then cut off the fuel supply, remove the fuel remnants, air out the chamber and start the starter. Then put the spark plug back in place and restart the engine. The black soot indicates that you have used low-quality oil or the fuel mixture has a bad oil to gasoline ratio. The cause may be a wrongly adjusted carburetor. The plug should be washed and cleaned of carbon deposits with a sharp needle or awl, ground with a fine cloth over the electrodes and screw the plug into place.

When checking the spark plug pay attention to the gap between the electrodes. The operating range is 0.5. 0.65 mm. If the gasket in the spark plug is worn or damaged, it can also cause problems with starting the engine. Check the spark plug for spark plugs as well. To do this, bring the ignition cable to it, then clamping it with pliers with insulated handles, the candle thread or nut put on the cylinder. Check with the starter rope to see if the spark is there. If there is no leakage, the spark plug is simply replaced. If a new spark plug does not give the spark, then the problem is in the high-voltage wire.

Troubleshooting in the fuel system

Fuel cannot enter the cylinder for several reasons:

  • The fuel filter is clogged. To fix the problem remove the fuel hose and watch for fuel leakage. If the jetting is poor, clean the fuel filter. Take it out through the hole for fuel filling, clean the filter, and if it is very dirty replace it with a new one.
  • The breather, a small hole in the tank lid, is clogged. It is necessary to remove the hose and clean the blockage with a needle.
  • Fuel is out or not enough. The cause is a clogged air filter. The air is not supplied to the carburetor in the right volume, the fuel mixture is too enriched, which disturbs the normal operation of the engine. The filter has to be carefully removed, rinsed, dried and put back in place.
  • Improperly adjusted carburetor. Since it is one of the main engine components, it is better to entrust the carburetor adjustment to a specialist. Self-adjustment can permanently damage the engine.

Chainsaw muffler. Disassembling and cleaning

When the engine operates normally at idle speed and stops with an increase in load, the cause is probably the muffler. Spark arrester gets clogged with combustion products and prevents normal exhaust. In this case it is necessary to remove the muffler and clean it from soot with detergents and then thoroughly dry it. While the muffler is removed, the hole in the engine should be plugged with a clean rag. A clogged muffler can be caused by excessive oil in the fuel mixture, poor oil quality or unsuitable two-stroke oil.

Let’s check the operability of the cylinder. piston group

Sometimes the engine does not run at full power or does not start at all due to insufficient pressure in the cylinder. The cause may be cylinder wear, crankshaft bearing wear, or piston ring retention due to piston wear. To visually inspect the condition of the cylinder head when removing the muffler, look through the bore. Although the observation is rather limited, it is still possible to get an idea of the condition of the cylinder and piston system.

To determine more accurately the condition of the cylinder, you should install a compressometer in the spark plug hole, turn the crankshaft by hand with a starter or with an electric drill. The pressure of the bandsaw should be between 8 and 9 atmospheres. Lower pressure decreases engine power.

Get a complete picture of the failure of the cylinder piston group can be, if you completely dismantle the engine, removing the crankcase from the cylinder and inspect the piston. If it has chips or deep scratches, it needs to be replaced. If the cylinder surface is worn out, it can be bored.

Piston ring wear may be the cause of compression loss. When in service, the ring is not sooty, is located loosely in the piston groove, and is pressed tightly inside the cylinder.

How to check whether there is soot in a silencer?

Take it off and look inside. To do this on the STIHL 180 chain saw unscrew the muffler mounting nuts and remove the muffler, deflector and fins. Take care not to tear the threads on the mounting studs when doing this.

If there is soot inside the muffler, there are two ways to check, depending mainly on whether the muffler is collapsible or not.

If your chainsaw muffler is collapsible, then the most appropriate way is mechanical. Dismantle the muffler into its component parts and clean it with a metal brush. After removing the base coat you can sand down and wash with chemicals. Allow the parts to dry and reassemble.

In the case, if the muffler is not disassembled, the situation is somewhat more complicated. It’s impossible to get to all the possible places where the soot has accumulated. There are a lot of recommendations. from soaking in acetone to pouring the shot inside The most effective is still the use of special technical detergents such as SCAT-D, Kavisan-Carbon S, Nanotek TK-1 and others How to use them? Just soak the muffler in the product for a few hours and then blow it out with a compressor. However, as far as possible, the soot should be removed mechanically, because the deposits in the muffler can be so “cemented” that no SMS will take them away completely.

[note] If the muffler is clogged, be sure to check the cylinder-piston group. It’s quite possible that there may be soot accumulation there too[/note]

Cleaning the chainsaw muffler is one of the steps for proper chainsaw care.

Chain brake failure

If the chain brake doesn’t work, it could be because the brake band is contaminated by grease or sawdust and wood resin, or under the fenders.

You can solve the problem by cleaning the dirt and replacing the brake band.

You see, there are many factors that can cause malfunctions in a chainsaw. Try to follow the advice given in the Instruction Manual while working and also create routine maintenance from time to time to keep your chainsaw in good working order.

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