Partner Gasoline-Powered Saw Stops When Pressing the Gas

Why chainsaws don’t rev up and how to fix it

Stable operation of an internal combustion engine depends not only on the condition of the internal components of the cylinder head, but also on the external devices with which it interacts. Rhythm disturbance entails various problems, one of which is manifested in a complete stop of the mechanism when you try to increase the revolutions. Cause such a malfunction, can reduce the efficiency of some nodes. How to determine the defective element and fix the problem is explained and shown in this article.

Impressive system design, includes many indispensable components, defect of each of which has a direct impact on the behavior of the tool. Unintentional stopping of the engine when trying to increase the shaft speed is most likely due to an insufficient supply of combustibles. Air and fuel passages become clogged with use and the chain saw does not develop its full power because the engine does not get enough “nutrients.

In addition to a continuous supply of fuel and air, the engine needs an open venting duct. Caustic substances form soot, gradually reducing the size of the holes in the tubes, and as a result the chain saw doesn’t revolve. The cause is in the muffler and may not be visible upon superficial inspection. The similar problem becomes actual after several tens of hours of running the tool (time depends on the quality of fuel).

If the valve (breather) in the fuel tank is clogged, negative pressure will be created in it until the pump stops pumping at all, interrupting engine operation. This problem is characteristic not only at high revs but it occurs more quickly just at gas pushes. Also, with a clogged breather, the chainsaw will not hold idle speed and will shut down within seconds after starting. To check the capacity of the valve, just unscrew the fuel tank cap, immediately after an unintentional stop. If when unscrewing it, air is sucked in sharply, it means that there is a vacuum and the breather plug needs cleaning.

The carburetor and its hoses play a major role in pumping fuel. You should first perform a simpler inspection of the hoses for leaks and cracks. If the fuel line is fine, the carburetor can be adjusted or the filter can be cleaned. All steps of this process, are visually described below.

A decrease in engine compression, due to compression ring failure or scoring, disrupts the operating stroke and muffles the system as the rpm rises. A quick visual check of this assumption can be made by removing the muffler from the exhaust port. Ideally use a compressometer by screwing it into the spark plug hole and pulling the starter grip a few times. Depending on engine displacement, the compression varies from 160 to 180 PSI. To be sure, it is better to get this value from the technical documentation, from the seller or the manufacturer of your saw model.

Lack of timely ignition, causes the chain chamber to replenish the fuel load. To overfill, 3 or 4 “idle feeds” are enough, so the plug contacts will be flooded and the tool will not work anymore (until they are dried out). The same problem often occurs with overheating when the resistance of the faulty coil increases and at high rpm the chance of flooding increases. Also, it could be caused by dirt or improper gap on the spark plug contacts.

Check the serviceability of the ignition module should be immediately after an unexpected stop “hot”, and after a complete cool down. Simply unscrew the spark plug from the socket, connect the cap with a high-voltage wire, touch the contacts on the metal surface of the engine and pull the starter. If the frequency of spark formation of hot and cold systems are fundamentally different, then the coil is defective and needs to be replaced.


After examining possible causes and finding out why the chainsaw won’t pick up speed, you can move on to the procedure for restoring performance. The following manuals are laid out in order of difficulty of repair: from filter elements, to the carburetor.

Air and Fuel Filter

The first and easiest manipulation, boils down to the replacement or cleaning of clogged filter elements. To access the air filter, simply remove the upper housing cover. After conducting a visual assessment and determining a high degree of contamination, the element is removed from the hole in the carburetor. The nylon filter only needs to be washed in water and soap to remove the clogged oil pores, then dried thoroughly and reinstalled. Felt is inefficient to clean, and is best replaced with a new one (although you can wash it too).

The fuel filter dangles in the gas tank, attached to the end of the hose of the same name. Determine the end of life can be determined by the gray or yellow color, and if the chainsaw does not pull, it is most likely the problem. You can pull it out with a hook made of a thin (2-3 mm) metal rod, or with nimble fingers. No matter what material (nylon or felt) the fuel filter can’t be cleaned and needs to be replaced. It is better to use ceramic-metal or felt ones, which will protect the carburetor from dirt and additives much better than nylon ones.


Prolonged use of the saw without maintenance, not only affects the filters, but also the exhaust system, gradually clogging the holes. If the fumes come out of the muffler suddenly, as if under pressure, and the chainsaw does not pick up when loaded and stops, then this element needs to be checked. To remove the muffler, just unscrew the 2 fixing nuts and (maybe) a couple of screws, then loosen slightly and remove from the studs.

If it can be disassembled, it is easy to get to the components. Separate, soak everything in kerosene, Kavisan-Carbon S or similar products to clean parts (for one hour), then clean with a metal sponge, brush or sandpaper. Non-disassembled mufflers are either replaced or burned until all the soot turns into ash, which is then simply shaken out.

Fuel tank valve

A less unambiguous, but quite popular reason for the engine stopping abruptly (especially abruptly, when pressing on the gas). How to determine a clogged breather, described above, and the process of fixing the problem we will show here. First of all, the element should be removed from the gas tank. The breather valve is located under the carburetor (usually on the left, but on Husqvarna 236. On the right side) and for easy access, it is better to remove the cylinder cover, unscrew 2 shock absorbers and lift the crankcase. The valve is tightly jammed into the gas tank opening and can be removed by squeezing it out from the inside with a screwdriver or a strong metal bar.

The most popular types of valves are cone-shaped and float-shaped. It is better to replace these elements with new ones, but if there is no possibility, you can gently clean them with a needle and kerosene. For ease of installing the breather plug in its native place, it is better to use tweezers or narrow pliers.


The main mechanism responsible for an even flow of air-fuel mixture into the combustion chamber. If it is the carburetor that is causing the chainsaw to lose power and stop working at high RPM, then the carburetor is not giving you the correct ratio of fuel to air and may need adjustment or service. Better to start with the adjustment screws, because they are freely accessible and quite often go astray, causing problems.

Most modern carburetors have 3 adjusting screws: L (Low). for adjusting fuel quality at low revs, H (Hight). for high revs (when throttle trigger is held down), and T (TAS) for idle. Throttle Adjustment Screw). to change the amount of fuel delivered at idle. We just need H, L, and a long slotted screwdriver. For convenience and clarity, it is better to adjust on a running saw, remembering the number of revolutions, so you should be very careful and especially attentive.

Chainsaw stalls when idling

The situation when the engine stops at idle rpm can be divided into 2 types: immediately after starting and after sawing. The second option involves shutting off “on hot” and is described below. For now, let’s consider the first situation, when the chainsaw does not develop revolutions and stops almost immediately after starting.

A sudden stop of the engine after ignition may be caused by the carburetor misadjustment that does not supply enough or, on the contrary, excessive amount of fuel, flooding the spark plug pins. In the case of a shortage of mixture, pay attention to the fuel hose, which should be fixed tightly on the carburetor and primer. A dirty filter attached to the end of the hose located in the tank can reduce the fuel supply.

Regarding adjustment screws. On a carburetor there are 3 options: H (High). high) for the high speed setting, L (Low. Set the throttle trigger to L (low) for low RPM and T (may be marked LA or S) for idle speed. We need the L screw, which should be turned half a turn clockwise. If this does not help, try turning the same screw 1 turn counterclockwise and turn it clockwise. In most cases this calibration will solve the problem if the chain saw fails to idle. This problem is usually caused by an imbalance in the air-fuel mixture.

Chainsaw stalls when throttle is depressed

One of the most common problems, resulting from tool contamination or incorrect oil proportions in the fuel. The situation where the chainsaw starts fine but shuts down when you add gas is usually due to a low flow of fuel, air or exhaust ducts. The system simply can not provide a sufficient supply or output of substances, as a consequence of which the working rhythm is violated and the engine stops. Let’s look at each potentially problematic component separately.

the air filter is the closest you can get, under the top cover of the housing. The filter fixed on the carburetor may be made of nylon or ferrite. Products in the first group, it is sufficient to wash in soapy water and dry. If the felt filters get dirty, it is recommended that they be replaced with new ones, as this material is not easy to clean. Determine the need for maintenance, you can visually determine the abundance of contamination.

The fuel filter is mounted on a hose of the same name that is loose in the fuel tank. To remove this element, it is better to use a metal hook, which is convenient to catch on the fuel hose. The level of contamination of the filter cannot always be determined visually, and if there are no obvious signs, you should estimate how long it has been in service. At medium intensity of work, the filter lasts about 100 hours, after which it is replaced with a new one. When choosing this part, it is better to give priority to products made of felt or polymers.

The exhaust system, with a heavy accumulation of soot, reduces its capacity to remove combusted substances. In this case, the engine starts to choke and choke at high rpm. To remove, clean or replace the element, simply unscrew a couple of nuts that press the muffler to the engine. To clean the element, a metal brush or sandpaper will do. Muffler maintenance frequency depends on frequency of use and fuel quality. With an average, domestic use, it is recommended to check the exhaust system annually.

One of the most serious causes of chainsaw mufflers stalling at high engine speeds is the scoring of the piston. Such a defect occurs with a lack of oil in the fuel mixture, which increases the friction of engine components. To check the theory of the piston wear and tear is possible by simply filling up the saw with a quality mixture prepared in the correct proportions of the recommended gasoline and oil (the proportions and brands are specified for each model of chainsaw in the individual documentation). Once the engine is running, it’s time to focus on fuel quality. Otherwise, scoring will get worse and a complete overhaul with piston group replacement will be necessary.

Partner 350 Benzosaws. Repair and Adjustment, video

Popular with gardeners, the Partner 350 chain saw successfully combines durability, ability to handle the toughest of household tasks, and economy. It performs well in harsh weather conditions, so you can use it in both summer and winter without risk of unexpected failure

Design of the Partner 350 Chainsaw

The Partner 350 stands out with its quality components and premium build quality. The basis of the garden tool. 2-stroke 1-cylinder engine that runs on a mixture of gasoline AI-92 and engine oil.

Engine piston group is forged and chromium-plated to prolong engine life.

The engine is equipped with a proprietary CCS filter that traps even the tiniest foreign particles and keeps them out of the fuel supply.

The Partner 350 chain saw has easier starting than its competitors because of its improved self-cleaning reel starter motor, professional-grade fuel pump, and long-lasting electronic ignition. The model is equipped with a primer to pre-pump the fuel used in the cylinder.

For operator safety during chain saw operation, Partner equipped the garden tool with a quality inertia brake that triggers immediately if the saw headset hits a nail or any other foreign object.

Metal bar and chain on the Partner saw. They can be tightened using two wrenches, without having to remove the protective cap of the plastic housing.

One of the big advantages of the Partner 350 is the control layout. The throttle trigger, recoil switch, and recoil starter cord are located on the rear of the machine, making it easy to operate in confined spaces.

Partner 350 Chain Saw Oil. How to Choose?

To extend the life of the engine and other working mechanisms of the garden tool, it is necessary to use quality engine oil for the fuel mixture. When it burns in the cylinder it should produce as little ash as possible, which can deposit on the walls of the muffler and on the spark plug.

Used engine oil should dissolve quickly in gasoline and be thoroughly cleaned of harmful impurities that tend to settle in the narrow channels of the Partner carburetor.

Your Partner 350 chain saw oil also needs to have good lubrication and corrosion-resistant properties and be able to stand up to wear and tear.

STIHL and Husqvarna 2-stroke engine oils are best used for fuel mixture. They keep the Partner garden tool well lubricated and do not produce much ash when burned.

Partner 350 chainsaw. model specifications

The Partner chain saw achieves high performance in the garden area thanks to its good factory settings.

Specifications for the garden tool include:

  • factory engine power. 1.8 L. с./1.3 kW;
  • Standard forged cylinder capacity. 36 cm3;
  • Engine idle speed. 4000 rpm;
  • fuel tank capacity. 400 ml;
  • oil reservoir capacity. 200 ml;
  • Recommended bar length. 40 cm;
  • Saw chain pitch is 3/8″;
  • weight 4.7 kg.

Partner chain saw makes very little noise and vibration during use. Sound pressure to the operator at maximum engine speeds is less than 108 dB.

Adjusting the carburetor on your Partner 350 with your hands

Before you start adjusting your Partner carburetor you have to clean it thoroughly from dust, dirt, and soot accumulated on the walls of the carburetor. In addition to the carburetor you need to wash and dry the fuel and air filter. Otherwise the operator will not be able to accurately set the desired engine speed.

On the upper left side of the protective plastic body of your Partner there are holes in which the manufacturer has screws for adjusting the carburetor. Once you have found it, you can begin the basic tuning of the unit.

To do this, the left and right screws, which are responsible for the number and quality of revolutions, respectively, should be set in a fully screwed position. Immediately after that it is necessary to loosen them by 1/5 of a turn.

The third adjusting bolt marked with the letter T should be left in the position in which it is set.

To fine tune the carburetor on your Partner 350, follow this procedure:

  • First you must start the chain saw and run it through the engine to get it fully warmed up;
  • After about 5 minutes you can adjust the mixture. first turn the left adjusting screw in the direction of the clock hand until the motor reaches maximum rpm. Then turn the left hand bolt back 1.4 turns. After performing these steps, your Partner chain saw should be running solidly at idle speed;
  • If after the manipulation of the left adjusting screw the chain on the bar starts to rotate, it must be stopped by alternately turning the bolt T;
  • Then you will need to adjust the quality of the fuel mixture. Turn the right adjusting screw in the direction of the clock. As soon as the engine reaches the maximum allowable revolutions, the screw should be turned back by 1/4 turn.

When adjusting the maximum engine speed of the Partner 350 saw, it is best to use a tachometer connected to the motor in advance. As soon as the instrument shows the same rpm as the model’s instruction manual says, it means that you must stop turning the propeller.

Reasons why a chainsaw starts and stops

The chainsaw has long been not a luxury, but a necessary tool for those who have a dacha plot or homeownership. But like any other equipment, this tool tends to fail, despite the uncomplicated device.

The classification of basic faults includes:

  • No engine starts
  • The engine starts and stops
  • Unstable operation of the tool
  • Stopping working under load
  • power loss.

If your chain saw won’t start at all, it could be because

  • Manufacturing defects
  • Lack of fuel
  • Problems with starting the ignition system
  • Lack of spark from the spark plugs
  • Poor fuel mixture
  • Clogged carburetor
  • Problems with the high-voltage wire
  • Lack of compression.

Why the chainsaw starts and stops, what to do in such a case? It is necessary to consider in detail the reasons for this.

Chainsaw starts and stops: cause, video

The reason why a chain saw stops right after it is started is because a certain piece of equipment is malfunctioning.

  • The most trivial reason why a chainsaw starts and stalls can be a low fuel level in the tank. This can be evidenced by the tool stopping when tilting, when fuel residue accumulates in a particular area of the fuel tank. With low-quality fuel can also cause problems with the work of the chainsaw, in which case you need to replace it completely.
  • A clogged breather that greatly reduces fuel flow to the engine.
  • Insufficient contact of the wire cap with the spark plug, which leads to high heating of the spark plug insulator. Deterioration in contact can be caused by mechanical shear or carbon buildup.
  • Spark plug failure.
  • A clogged muffler that impairs exhaust emission, causing the engine to stall. This can cause the chainsaw to start and stop when idling. Sludge in the muffler can also be a result of poor fuel quality or improper use of the tool.
  • Poor carburetor adjustment.
  • Piston rod failure
  • Problems with the fuel filter or pump. Gasoline may leak through the pump or flow poorly through the fuel filter to the carburetor. As a result, the chainsaw may start and shut down at higher engine speeds.
  • Contamination of the air filter. Problems with this piece of equipment lead to the fact that, with increased loads on the engine, it simply can not cope with them due to clogging and stops. Similar results are also obtained at higher rpm.
  • Chain shorting due to lack or insufficient lubrication, as well as problems with the chain brake.

Why chain saw fails to start and stops

If the equipment fails to start “when cold” the problem may be a lack of compression, i.e.е. the rings are worn due to a long period of use, they need to be replaced. sometimes the reason that the engine does not start well when not warmed up is a problem with the muffler, and poor contact between the spark plug and the wire.

Also causes for poor starting may be wear or damage of the gasket, rubber collar in the booster pump of the carburetor, which causes additional air flow, resulting in higher saw speeds.


The equipment should be operated correctly, with periodic inspection of component parts to prevent breakage. To fix the problem, you need to check all the components of the equipment for their function.

If the chainsaw starts and stops, the cause can be corrected by your own efforts. If it is a shortage or an improperly mixed fuel mixture, it must be corrected. Always drain off the remaining fuel when the chainsaw is not in use as a preventive measure.

Spark plugs should be checked periodically. Clean up the soot that clogs the gap, and check the tips for fuel. Another cause of problems with spark plugs may be that they are wet with gasoline. To do this, they must be removed, wiped down with a rag and left to dry. Replace defective spark plugs.

If there is no spark between the spark plug and the high-voltage wire, but if they are well connected, it is necessary to replace the ignition unit.

A clogged muffler is a common cause of malfunctions that cause the chain saw to start and then stop immediately. To correct the problem remove the muffler and clean the soot deposits with emery cloth or a special chemical solution. If the model of the chainsaw is not dismantled, chemicals are poured into the system and stay there for several hours, then it is blown out.

The carburetor must be adjusted if the chainsaw stalls at idle. Fine-tuning is a rather time-consuming process, so it is usually done at service centers.

But, on some models there are elements for its adjustment, it is enough to turn a bolt half a turn to increase the revolutions of the chainsaw, the problems will be eliminated. If the jets, nozzles, channels and filters are clogged, it is necessary to disassemble and clean the entire carburetor.

If the seals, gaskets, sealing collars are worn, they must be replaced to prevent air drainage.

If there are problems with the fuel or air filter, the fuel pump must be replaced or the air filter cleaned.

If the breather is clogged, it is necessary to clean it with an ordinary needle.

When the chain saw starts and then shuts down, the chain may be malfunctioning. To correct problems, check oil availability in the chain lubricant reservoir and oil drain tube for lacerations or blockage.

When inspecting the piston group pay attention to the cylinder, replace it or the piston if necessary. The cylinder can be bored to fit a new piston. If the piston and cylinder are normal, attention should be paid to piston ring defects and the need for replacement.

Check and Repair Filters

The engine may run intermittently or stall with insufficient fuel or air. Causes. clogged air or fuel filter. To check the fuel filter, remove the gas line hose from the carburetor connector and direct it into some container. Then press several times to pump up the fuel. If the fuel is pumping normally, in well-defined doses, without dirt, the fuel filter is serviceable. If the jet is weak or the fuel is not pumping at all. the filter should be changed or if possible cleaned.

Fuel filter clogging by sawdust is one of the causes of chainsaw failure.

The unit should be removed from the fuel tank (before draining all fuel from the tank). Most models allow the fuel filter to be pulled out through the neck with a wire hook. If the filter is collapsible and allows cleaning it should be disassembled and washed according to the manufacturer’s recommendations. Otherwise change it for a new filter.

Similar problems can occur if the air filter is clogged with dust, sawdust, dirt. If there is not enough air, the fuel mixture will be enriched and the combustion process will be hindered.

To check it, remove the filter. Take precautions during work to prevent dust from getting into the carburetor. Clean and flush out the unit with warm water and detergent. After drying, if possible, blow out with compressed air at low pressure, put it back in place. If the chainsaw works properly, the cause is eliminated, if not. you need to look further.

If you use the tool regularly, it is a good idea to change the fuel and air filter every 3 months.

Checking spark plugs and ignition system

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

Typical defects in the ignition system are as follows:

Check the spark plugs on the chain saw if they are faulty.

  • The spark plug is flooded with fuel at start-up. Take it out of the plug socket, dry it and if possible blow it out with compressed air. Drain fuel residue from the cylinder through the adjustment hole, blow it out with compressed air. Then install the spark plug, connect the high-voltage wire, start.
  • No spark on the electrodes. Need to disconnect the high voltage wire and check the spark on it. If the spark is normal, check the connection, fix the detected defects. Lack of spark on ignition cable indicates defective ignition unit. This unit is beyond repair and must be replaced with a new one.
  • The gap between the electrodes of the spark plug is disturbed. This parameter for different types of devices can be in the range from 0,2 to 0,5 mm. Check and correct with a special dipstick or caliper. Consult your tool operator’s manual for the correct value.
  • By the appearance of the spark plug you can determine the direction of the search. If the spark plug is dry after several attempts to start the engine, it means that there is no petrol in the cylinder. Check fuel system and carburetor.
  • The presence of black soot or carbon deposits on the electrodes indicates improper carburetor adjustment or clogging of the air filter. Maybe you are using bad quality fuel with a lot of oil. When the ignition system is operating normally, the electrodes have a uniform gray color and brown deposits on the insulators.

Good afternoon, dear readers and subscribers to my blog! At one inopportune moment you can easily find out that your chain saw

does not start. Alas do not rush to immediately surrender the tool for repair, you will not be difficult not to eliminate this breakage. I will tell you what to do, in cases when the chainsaw does not start, not how to find the right solution to this problem.

Let’s look at the possible causes of failure

To find out why the tool does not start of course in the manual itself. However, the manual is not necessarily there.

Although each model has its own characteristics, but in general, what remains to do. So I will tell you the possible reasons

Breakdowns not possible ways to fix them for different tools.

How the mechanism works

All tools, not foreign (Husqvarna, Makita, STIHL), Partner

350), not Chinese chainsaws, not domestic (Druzhba, Ural), are arranged the same. Therefore, it is very easy to find the reason why the machine does not start and does not shut down.

There are four elements where problems occur:

  • Fuel, for which the carburetor is responsible;
  • Lubrication;
  • The air coming in through the air filter;
  • The spark, what quality is involved depends on the ignition unit.

They depend on each other and do not interact with each other. If one element does not work properly, the saw stops working.

The first question that our customer has to do tools start differently. hot on cold. The chainsaw is not if there is no spark, it may be the cause of the malfunctioning chainsaw. Two commonly used mechanisms are responsible for this rumored process.

Always check what is written in the owner’s manual. It says that when you turn it on you need to make sure that the emergency stop brake is engaged. However, to start the saw with the brake is much more difficult, so it is better not to turn on the brake.

Most learn from the manual, inside the body are the fuel tank not the engine, and outside. the saw part (bar with chain), the handle not the starter.

First you need to figure out exactly how the tool does not start. Nettles, the saw starts, alas, immediately stops, or loses power of operation, the quality of the cut.

Basic configuration

Your Partner chain saw comes standard with the same accessories as the other models: a Partner saw bar, a Partner chain, a universal wrench, a carrying case, a container for mixing the fuel mixture, a protective boot, a saw blade, a warranty card from the manufacturer, and the instruction manual.

Partner P340S: basic equipment

Partner P340S chainsaw manufactured at Husqvarna factories in China, Sweden, USA, Italy. The cost of tools on the market varies quite a lot. from the budget version of the production of China 40 to 120 offers.

Chinese assembly sometimes causes a lot of complaints from owners. But recently it is possible to meet and positive reviews about the equipment made in China. Obviously, we can still sense the modern orientation of the Chinese economy toward quality versus quantity, which prevailed 10-15 years ago.

However, it should be taken into account that the original Partner P340S chainsaw is better in quality, handles heavy loads more effectively, but is also more expensive to maintain. If you plan to use it moderately, you can buy the Chinese assembly.

The chainsaw does not pick up speed. what to do? The main reason

And the chain saws of the past which apart from the fact that they could only cut a tree, making a horrible noise and vibration, audible almost for kilometers, have long ago become a thing of the past.

Practically silent, perfect tools, which are now a pleasure to hold in the hands, flood the market, giving users a feeling of complete happiness and technical freedom.

But, unfortunately, no matter how technically and visually advanced the equipment is, its failure is a frequent occurrence, and the manufacturers speak about it only “by default”.

Not an exception to this and chain saws, multifunctional working units that require a lot of attention from the user to recognize the “catch” in time and stop the problem in the earliest stages.

The main of these nuances are usually related to the moment of start, which should be treated with the utmost responsibility. Let’s look at the basic processes that can happen to a chainsaw when the motor is turned on.

The chainsaw does not pick up speed. what to do?

And this phenomenon may be accompanied by the fact that the motor occasionally does not start at all, loses speed, and the load can not withstand more than idle speed. If you do not pay attention to this problem in time, you can “lose” it because of severe overheating.

partner, stops, pressing

The main reason for this usually lies in the engine area, so it is worth taking a closer look there.

Other points that could lead to these consequences are:

The spark plug is visually diagnosable, so if it is too dry or, on the contrary, very wet and has a substantial buildup on top, it is necessary, if not replaced with a new one, just cleaned or dried and tried in operation outside the ignition system of the saw.

Regarding the carburetor, the source of malfunction can be:

  • wear and tear on the piston components;
  • Its clogging;
  • breakdown of the air filter;
  • the use of gasoline with a low octane number and of inadequate quality;
  • Damage due to the vibrating action of the tool itself.

Each individual model is usually based on a 3-screw method of adjustment, and reaching the maximum torque will help the “H” screw.

The first angle grinder for a private home is a chain saw. The minus thermometer is one of the factors that can “undermine” a chainsaw.

Many users note that in severe frosts, even pouring warmed up oil does not help and the grease involuntarily freezes on the tire. The ice on the carburetor and frost on it. also a fairly common thing.

To reduce exploitation of the tool before the onset of the body, or if the design allows, to change the damper mode from summer to winter, which is installed on some models under the aero filter cover.

What can cause the chainsaw’s failure to hold idle speed?

As the saying goes, it starts up, but then stalls and does not have time to move to the next power level. Many conditions may cause it:

  • clogging of the filter parts;
  • malfunctions of the ignition system;
  • The carburetor settings are out of alignment;
  • The gasoline drive has a defect or was damaged during operation;
  • The muffler is clogged or the exhaust ducts are clogged;
  • malfunction of the cylinder piston and installed valves.

Of course, it is difficult to make an independent diagnostics of everything at once, but walking through the proposed items you can still get an answer to your question. In half the cases it is enough to clean the carburetor, check the setting of jets. and the job is done, the chainsaw works as before.

What to do if the chainsaw won’t cut down??

The opposite of the previous situation is when the power tool goes to high output very quickly and does not reduce it.

In this case, it can be observed that neither a screw on the body, nor cleaning the carburetor it can not be eliminated in any way. You would think what else is needed, the saw is working, it produces power as per the instructions.

But the trouble is that the fuel in such a case needs dozens of times more than usual.

The following actions can help:

  • check the throttle cable;
  • inspection of the return spring, which could simply come off;
  • sealing of the rear choke, which must be very tightly closed.

Usually one of these activities can make a lot of sense.

Another technical problem is the situation when the chainsaw picks up on its own, the cause of which is usually more than one. In this case, as well as under load the saw could start to stall intermittently, not allowing you to fully use it for its intended purpose

The leading causes of this can be:

  • clogged carburetor or fuel and air filter;
  • A breach in the integrity of the hose that supplies the fuel;
  • Depressurizing the lead pipe from the carburetor to the engine cylinder;
  • And again, one of the screws (usually the H screw) of the carburetor system is not set correctly.

So the easiest thing to do at home is to clean the carburetor and filters, both air and fuel filters. It is important to keep the screw elements L and H properly adjusted at the same time.

Some advise to remove the fuel filter from the design at all, but it is not a solution, because the carburetor will not last so long.

So before you start just to look whether it falls, no kinks in the hose through which the fuel flows, and then already take more drastic action.

As you can see, there are many problems, but an excellent panacea for each of them is timely diagnosis, able to answer many questions about the technical failure of the device even before they appear.

Chainsaw stalls. looking for and solving problems

A chainsaw is a very useful tool, which is simply indispensable in the household. This is a relatively simple technical tool, but its mechanisms are characterized by failure. The chainsaw can stall, not pick up speed at the most important moment, not allowing to perform the planned work. We’ll look at the causes and solutions in this article.

To understand the causes of chainsaw failures, it is necessary to understand what such a device is.

It’s based on an ordinary two-stroke internal combustion engine, and its malfunction is the most common cause of chainsaw malfunctions.

The internal combustion engine can be capricious for a variety of reasons, but they all lead to the same consequences. The most common consequences of breakdowns are the following:

A working chainsaw is the key to quality success

The cause of such malfunctions can be a variety of malfunctions. The most common of them are the following:

  • clogged air or fuel filter;
  • malfunction of the spark plug
  • carburetor malfunctions due to strong vibration of the mechanism;
  • problems with the gasoline line;
  • poor-quality fuel mixture;
  • A contaminated muffler;
  • problems in the cylinder group.

Each of the possible problems should be analyzed in detail.

It is possible for your chain saw to stop when idling if the filters in the chain saw become clogged.

The first thing to check the fuel filter if there are problems with the tool: to do this, disconnect the fuel line and look at how the fuel flows to the carburetor.

If the fuel is delivered in normal doses, then there is nothing wrong with the filter and the problem must be looked for elsewhere. If not enough or no gasoline is coming in, you will have to clean or replace the filter.

In order to clean the fuel filter you need to drain the fuel from the tank and remove the filter element. to remove the filter through the filler opening of the tank hook, which can be made from an ordinary wire.

Disconnect the filter from the suction hose and take it out carefully.

partner, stops, pressing

Sometimes a clogged filter can be cleaned, but in most cases it is much easier and more expedient to purchase a new filter element and then install it the way the old one was removed.

The air filters get clogged with dirt and dust, as well as the fuel filters. Such problems often lead to malfunctions in the chainsaw. because of a clogged filter in the system air supply is obstructed, there is too much gasoline in the air-fuel mixture, which leads to malfunctioning of the device.

To clean the filter element it must be carefully removed from the chain saw so that the dust on it does not get into the carburetor. If it is not visibly damaged, it is simply cleaned thoroughly, then washed with the available detergents, dried and returned to its place.

The spark plug. the most important component of the ignition system, it is recommended to change it annually, but owners often forget about this simple rule. As a result, there are noticeable problems in idling operation. There are several malfunctions common to the ignition system, the most common being the following:

  • 1. When starting, petrol fills up the spark plug. It is necessary to remove the spark plug from the hole, dry it without burning and drain the socket of excessive gasoline. After half an hour you can reinsert the spark plug and try to start the mechanism again.
  • 2. Poor contact of the spark plug tip with the wire. Bad contact results in no spark and chain saw does not operate normally. In this case it is necessary to check the connection and fix the problem if it is present.
  • 3. Trouble in the electronic ignition module, causing a defective spark. If checking the tip-to-wire connection does not reveal the problem, but there is no spark, the ignition unit may be the cause. It is impossible to repair the block, if it is broken, it must be replaced with a new one.
  • 4. Incorrect gap between the electrodes. The distance between the electrodes is between 0,2 and 0,5 mm for each spark plug. the gap is set with a feeler gauge of suitable thickness.

If the faulty spark plug is not damaged, then the defect lies elsewhere. A completely dry spark plug indicates that the problem is not fuel. If that’s the case, you would have to inspect your chain saw’s entire fuel system to find the problem.

The presence of black sludge on the spark plug indicates poor carburetor adjustment, oil in the fuel or oversaturation of the fuel with air. In this case, you should take out and clean the spark plug, completely replace the fuel and re-adjust the carburetor.

If the inspection did not reveal problems with the filtration elements and spark plug, it is possible that the unit does not gain momentum due to substandard carburetor operation.

This assembly in the mechanism is responsible for supplying the engine with the right amount of air-fuel mixture, and if it is not properly adjusted, the chainsaw will not work properly.

There are three special screws on the carburetor that allow you to adjust it:

Some manufacturers are afraid of intervention in the device incompetent and inexperienced users, because they have only one screw on the carburetor. the one responsible for idling.

Regardless of the number of screws, adjustment of the device may be carried out only in full accordance with the manufacturer’s instructions.

If after adjusting according to the factory standards, the carburetor continues to malfunction, it is recommended to clean the air and fuel channels of the device, the grid and the filter jets. If you find faults with these parts, it is recommended that they be replaced with new ones.

When maintaining and repairing a chainsaw, you must remember that the carburetor is a complex unit consisting of many parts that are easy to damage. To prevent this from happening, dismantle the carburetor slowly and carefully.

Why chain saw stalls? Causes and troubleshooting

What to do if the chainsaw stalls? Many chainsaw owners know the weakest parts of their tool, but it can be a situation when the cause is not found at once.This manual is also very useful for those who have recently purchased a chainsaw.

WARNING! If you can not find your cause in the list below, you can ask your question in the Комментарии и мнения владельцев. So the chainsaw keeps stopping There can be many reasons, because although the saw is not a Formula 1 car, but it is a technical device. The main condition of successful repair is an exact diagnose of a malfunction.

It is not necessary to start immediately to disassemble the chainsaw, at first it is necessary to check the most simple possible causes of malfunction. Here’s a quick walkthrough of the possible causes.

(This is the second edition of this article, in which I will try to describe all possible causes in as much detail as possible.)

If your chainsaw won’t start. read more here:


If the chainsaw stalls for no apparent reason and you can’t identify even approximately possible malfunctions, then it is worth going through all the possible causes. There are of course standard, typical problems that we’ll talk about below, but for now, let’s go step by step!

1.Check the fuel mixture.

First, prepare it according to the manufacturer’s recommendations and using quality components. Second, empty the tank completely or drain the fuel mixture before long periods of idle time or between-season storage. Read more about fuel here:

2.Clean the air filter or change it.

A contaminated air filter does not allow the amount of air to be supplied in the amount that a chainsaw is designed to work normally.

That is if carburetor which mixes air and fuel mixture was adjusted with the same amount of air, then if air filter is dirty, amount of air decreases and adjustments remain the same and as a result we get enriched working mixture.

3.Check the spark plug

There may be several sub-items here as well. The first step is to unscrew the chainsaw plug and check if it got wet while trying to start. It often happens especially when the chain saw is started by inexperienced users who don’t follow the sequence of starting when the saw is cold.

In this case it is necessary to dry the spark plug or install a new one and retry according to the instructions. The spark plug tip can fail. To check this you can unscrew the plug and put it in the tip put on the block and pull the starter cord a couple of times.

If the spark is there, it means that the spark plug and other electrics are fine.

Another step in checking the plug is to check the gap on the plug and for fouling. See manufacturer’s recommendations for clearance. This is usually 0.5 to 0.65 millimeters.Clean the fouling from the plug by using fine sandpaper or a wire brush. Read more about spark plugs here:

Diagnosis of the chainsaw engine by the state of the plug

4.Check the fuel filter

As with the air filter, the situation with the fuel filter leads to a change in the composition of the working mixture. Only if the air filter is dirty does the mixture become richer, but if the fuel filter is dirty it becomes poorer.

If there is not enough fuel in the mixture, the chainsaw engine will not run. Besides, a clogged fuel filter prevents a regular fuel supply to the carburetor and further to the combustion chamber.

This is especially noticeable when the chain saw stops when you accelerate.

The breather valve. check valve, which is located in the gasoline tank and prevents the vacuum in the tank. If it is clogged, air does not flow instead of the used fuel mixture and the fuel pump cannot cope with the fuel supply.

It often happens that the primer (a pump for pre-pumping fuel) pumped fuel into the carburetor and the chain saw started. After the carburetor’s fuel supply is used up, and because the breather is clogged, the fuel fails to come out. the chain saw stops.

6.Checking the carburetor

In half the cases, if not more, a faulty or out-of-order carburetor is the cause of a chain saw that stops working.

Read about carburetor tuning here: http://benzopilatut.The fuel filter often fails to perform its duty of cleaning the gasoline

What problems can be inside the carburetor??

    Clogged jets, nozzles, filter, channels. With the “quality” of home-made fuel the fuel filter often fails to cope with its duty of cleaning dirt, refuse, impurities from gasoline. In such a case jets get clogged, and fuel either flows in insufficient quantity, or is not supplied at all.

If the oil seal is cracked or damaged, e.g. when disassembling the pump, additional air supply is created (“blow-by”). This, in turn, will lead to an increase in rpm at first, and then the chainsaw will simply stall. It is only necessary to replace the seals.

One of the most common causes of chain saw malfunctions and does not start is air intake. The saw can suck air in many different places. Check in order:

    Fuel hoses. Often micro or not micro cracks can form in fuel hoses from time or when using low-quality materials. In most cases it is possible to find them by visual inspection. It is also worth checking the hose connections.

partner, stops, pressing

How to check chainsaw oil seals? There are two of these hoses, and they both fit on the crankshaft. To check for leaks at home I know of two ways to do this: 1. Check them with pressurized air.

It can be done with a compressor, preferably a stationary one, but a car one can be used too. All holes must be plugged. namely the outlet on the muffler side and the inlet on the carburetor side. Unscrew the plug and pressurise the air.

Where is the breather plug located?

Your Partner 350 chain saw has two breathers like any other chain saw. One is responsible for equalizing the pressure in the oil tank, the other in the fuel tank. The oil tank breather is installed next to its cover, and on top of the breather is a special disposable metal plug that allows air.

The fuel filler nozzle of the Partner 350 is located in the carburetor mounting area and is sealed with a stopper like the previous one.

Tip: The breathers must be replaced if there is a vacuum in the tanks and the fuel and oil supply is interrupted.

Oil Pump Repair and Drive Sprocket Replacement

The oil pump on your Partner 350 chain saw needs to be repaired if you can no longer get oil at all or just partially. Mechanism of the oil pump includes the pump itself and the pinion with worm gearing, which is driven by a sprocket mated to the clutch.

The most common problem with the oil pump is the lack of threads and splines on the pinion or splines on the worm gear. You can correct the situation by replacing parts with new ones.

To remove the oil pump on your Partner 350 you will need to remove the side cover and guide bar of the chain saw, fasten the piston and use a wrench or a home-made wrench from a 24″ socket to unscrew the clutch.

Clutch has a high moment of tension, that is why it is necessary to use a screwdriver and turn clockwise strictly. Do not use a hammer and chisel to open the clutch, it is very likely to fail and damage the bearings on the crankshaft.

To replace your Partner 350 drive sprocket, simply unscrew the clutch, remove the old part, and install the new one. Sprocket is mounted on the shaft through a needle bearing. If the sprocket is replaced, it must be inspected for defects and lubricated. For lubrication, you can use regular Lithol or any other high-torque sustaining grease.

The process of replacing the drive sprocket is shown in the video, after watching it, you can easily repeat what you saw on your chainsaw.

Reasons for stoppage at full throttle

Sometimes the chainsaw malfunctions when moving freely. If it was working well and suddenly stopped doing so, and the starter does not turn, you can suspect that the device is jammed. In this case you can’t do without major repair.

When the saw was running well, but gradually lost power and then stopped, you should suspect something else entirely. In this case, the cylinder is overheated, which can be explained by air suction under the rubber socket or by a rupture of the socket. To get rid of the problem, it is worth replacing this element.

The structure of the chainsaw cylinder piston group

Problems related to improper operation of the fuel system

The tool stalls if the integrity of the fuel line is compromised or the mixture ratio is incorrect. Such tube defects are especially common when the tool has been in a room with extreme temperature fluctuations for a long time. When refueling the appliance, you must follow the manufacturer’s recommendations for the gasoline to oil ratio precisely.

Oil and gasoline ratios for a chainsaw

Troubleshooting the Husqvarna 142 chain saw

What to do if STIHL 180 chain saw does not start. troubleshooting