Repair Partner 350: High speed, carburetor not adjustable

Carrying out disassembly

Before you begin adjusting the carburetor of the Partner-350 gasoline saw, it is necessary to study the design of the unit in detail. Since it is used almost unchanged in many models, the recommendations below are relevant for the vast majority of them.

When removing elements, you should be as careful as possible, laying them out in the same order in which they were dismantled. This will make the subsequent assembly easier. The top cover is held in place by three bolts, they need to be removed. After this, a layer of foam rubber will become visible, serving as an air filter element. To remove the drive rod, you need to get rid of the gasoline hose. It is impossible to adjust the carburetor of the Partner-350 chain saw without removing the cable tip; this must be done at the next stage. The fuel hose located on the left side of the fitting must be removed. After completing all the above procedures, you can disconnect the carburetor and begin adjusting it. This mechanism is very complex, for this reason, during subsequent disassembly, extreme care must be taken when removing parts. Without this, they are easy to lose due to their small size.

Ignition system malfunction

Checking the exhaust channel of the chainsaw.

One of the reasons why the chainsaw does not work perfectly is that the exhaust duct or its muffler may be clogged. With all this, a drop in power is noted during the process of sawing lumber and logs. In most cases, this is due to tarry deposits on the spark arrester or muffler, which are formed when burning gasoline and oil of poor consistency, preventing the removal of exhaust gases.

A resonator clogged with carbon deposits can lead to poor starting of the gasoline saw.

Remove the cause of the disgusting start of the chainsaw; in this case, you can remove the accumulated combustion products. To do this, do a number of manipulations:

• Pull out the muffler by unscrewing the screws;
• Remove the cooling panel and gasket;
• Remove the spark plug;
• Disassemble the resonator housing;
• Wash all elements from carbon deposits with detergent;
• Let them dry completely;
• Reassemble everything in reverse order;

Disassembly and cleaning

To work, we need a shaped screwdriver PH1 and a small, clean, flat surface. Unscrew the four screws to get to the membrane.

Unscrew it, remove the cover, underneath there will be a membrane, it is usually firmly glued to the intermediate gasket, carefully peel it off, the lower gasket is not always removed without deformation, so we do not touch it, lay everything out in the appropriate sequence.

Under the membrane we see a rocker arm that lifts the needle, the rocker arm sits on the rod, and the rod holds the screw and unscrew it, take everything out in place! We unfold the carburetor, and on the reverse side there will be a cover on which the idle speed adjustment screw is located, unscrew it too, and we get this picture.

On the carburetor body itself in the photo we see a large hole in the upper right corner, there is a metal mesh there, we take it out and blow it out, and also carefully insert it in place. Now we check the membrane itself, it should not be oak, when pressed it should freely return to its original state, and the central metal rod should sit dead on the membrane itself, if it rotates freely, then only replacement. But usually, if the carburetor is capricious, we immediately take a carburetor repair kit for Pratner 350-351.

We unscrew the adjusting screws L and H; before assembling them, it is not possible to confuse their different thread diameters. We blow out the carburetor under pressure and check all the mounting holes for wear, and also watch how the needle moves in its seat, it should not bite, and the end should be the same color.

If it is like in the picture, then this is wear on the intake needle due to the presence of dirt particles in the fuel. Such a needle will not provide a seal and fuel will leak, resulting in over-enrichment of the combustible mixture.

Application

In practice, this is a tool whose basic meaning is quite difficult to clearly define. The fact is that such equipment is universal and has a very wide scope of application. For example, it is very relevant when performing gardening, construction, and other types of work.

Many summer residents and gardeners purchase lightweight models for caring for fruit trees in their country plots. That is, today the chainsaw has undoubtedly become a high-performance alternative to a handsaw or an ax. And almost every craftsman is familiar with the features of its operation and adjustment of the spark plug gap.

But do all owners of summer cottages know how to repair such equipment in case of any malfunctions in its operation? Let's discuss further what to do if your chainsaw won't start and the spark plug is flooding. We’ll also talk about why this happens.

Why problems happen

Why does the spark plug on a STIHL chainsaw flood? The answer is simple: this happens when the unit is started by an inexperienced user who does not follow the correct sequence of starting the equipment when cold.

Because of this, the spark plug tip may fail. To verify the presence of such a problem, unscrew the spark plug and insert it into the tip. Then place the part on the block and pull the trigger cord several times. If there is a spark, you don’t have to worry about the electrics and the condition of the spark plug.

Be sure to check that the chainsaw's spark plug gap is adjusted correctly.

In order for the chainsaw to work properly, it is necessary to carefully monitor the condition of the spark plugs, and also to ensure that the gap in the chainsaw spark plug is correctly adjusted. An incorrectly adjusted gap will cause damage. Carry out regular maintenance of equipment of this kind, and there will be as few problems with it as possible.

The following is a useful video on the proper use of a chainsaw.

to the post “Pouring a candle on a chainsaw: what to do?”

So much verbal diarrhea... A chainsaw is, of course, a necessary, important, irreplaceable thing! He never said what the gap in the spark plug should be. DEMAGOGY!

I need a description of spark plugs for a lawn mower

The gap in the spark plug is 0.5 mm). Both in the saw and in the trimmer)

The engine is 2-stroke - there should not be a large gap)

Resetting and starting correctly

Remove the top cover, disconnect the cap and unscrew the spark plug from the socket (the air damper must be closed).

Carefully wipe the spark plug contacts with a clean rag and set aside to ventilate.

Place the chainsaw in a vertical position, handle down, and pull the starter 10-15 times until the fuel leaves the combustion chamber.

After visually checking that there is no fuel, we install the spark plug back, put on the cap and assemble the housing.

We repeat starting the engine “cold” with the air damper closed, making no more than 3 pulls of the starter (otherwise you will flood again).

After setting and the characteristic engine stroke, open the valve and start the tool in operating mode.

Carburetor operation

When starting the internal combustion engine, the air damper closes. This mode produces a rich mixture. The engine gradually warms up:

1. The cylinder walls heat up.
2. Heat is transferred to the fuel chamber, the fuel temperature rises, which improves its evaporation during external mixture formation.

The filter elements do not allow abrasive particles contained in the surrounding air to enter the cylinder.

• After warming up, you can open the air damper. Correct idle speed control is responsible for stable operation.
• During operation in a converging diffuser, the air flow moves at high speed. Fuel is sucked into the diffuser, it evaporates, and a working mixture is formed.
• When the throttle valve is opened, the amount of charge supplied increases.
• The turnover is increasing. Power and torque are also higher.
• By closing the throttle, the flow of charge is reduced. Power is reduced.

To regulate the carburetor, there are adjusting screws; they are located on the control panel. The operating mode is set by the position of the levers associated with the damper and throttle. For ease of control, cables are attached to them.

What to do if the spark plug is flooded on the chainsaw

If you suspect a flooded spark plug, you need to inspect it. Using a spark plug wrench, it is unscrewed and carefully examined. If the spark plug is wet, but there is a spark, then it has definitely been flooded.

Many experienced owners are able to determine with a high degree of probability the current condition of a candle by its color. It is recommended to carry out this procedure regularly.

1. Light brown soot is exactly what all owners want to see. In this case, the functionality of the chainsaw is not impaired.
2. Black carbon deposits indicate an unbalanced mixture, namely a lack of oxygen in the fuel chamber. If the situation does not improve, there is a high probability that the chainsaw spark plug will flood again.
3. If corrosion is detected on the fork or the distance between the electrodes is too large, then most likely a lean fuel mixture is used.

Chainsaw Partner 350 – malfunctions and their elimination

Most owners of this Partner model encounter problems that can be considered typical for this configuration of the tool. To be able to eliminate them, you should understand the causes of breakdowns and study the most effective methods of repairing them.

Chainsaw Partner 350 starts and stalls - how to solve the problem?

The most common cause of this breakdown is a clogged air filter. Due to dust, debris and insects, it is not able to pass the amount of air that is necessary for the normal operation of the Partner 350 chainsaw. In this case, you will need to remove the filter and wash it with clean gasoline. If this does not help, then the filter element should be replaced completely.

Another common cause is a faulty spark plug. To check, you will need to unscrew the part and inspect it. If there are small light spots on the spark plug, it means the part is working properly. However, if the ceramic walls of the candle are covered with a thick layer of soot and oil, then it needs to be cleaned. To do this, you need to heat the candle with a lighter and carefully scrape off the carbon deposits. If this does not help, the spark plug will need to be replaced.

What to do if the Partner 350 chainsaw does not start?

In this case, you need to carefully check the ignition system of the tool. Most often, the saw will not start if the gap between the magneto and the ignition coil is broken. In this case, you will need to disassemble the saw and adjust the distance between these parts. If you don’t have a sample on hand, you can use a pocket calendar or a paper business card instead.

Also, the Partner 350 chainsaw may not start due to a clogged fuel filter. If a lot of debris has accumulated in it, then it will not allow the amount of fuel the engine needs to pass through. In this case, the filter will need to be replaced.

The chain on the Partner 350 chainsaw is not lubricated - troubleshooting

The main reason for this malfunction is a loss of tightness or a break in the hose through which oil circulates for the chainsaw chain. In this case, you need to remove the top and side shields of the chainsaw body, and also inspect them for stains. To solve the problem you need to replace the worn hose. When installing, sealant will need to be applied where it is attached to the pump.

If the cause of the breakdown does not lie in the hose, then you need to inspect the oil pump. It may be clogged or broken. If you cannot wash the part, then it is best to replace it with a new one.

Filling a spark plug on a Partner 350 chainsaw - troubleshooting

Often the spark plug on a chainsaw begins to flood due to prolonged use of an incorrectly prepared fuel mixture. If you mix a large amount of oil in gasoline, this will cause the fuel pump to malfunction. Oil will flow from it into the housing, including onto the spark plug of the chainsaw.

Another common problem is a broken fuel pump. To check its operation, you should remove the tool body and start the engine. Next you need to press the gas trigger several times. If oil flows out of the pump, it means it is faulty.

As a rule, chainsaw fuel pumps cannot be repaired. It's best to replace it completely. To extend the life of the new pump, in the future you need to use only high-quality fuel and motor oil to refuel the Partner 350 chainsaw.

Related Posts

What to do if the chainsaw does not start

Have a nice day, dear readers and subscribers of my blog! At one inopportune moment, you may find that your chainsaw will not start. Why does the spark plug on the chainsaw light up? The answer is simple: this happens when the unit starts. But don’t rush to immediately hand over the tool for repair, maybe you can fix this damage yourself. I will tell you what to do when the chainsaw does not start, and how to find the right solution to this problem.

Repairing the fuel system of a chainsaw

When the fuel supply is interrupted, it is not surprising that the chainsaw does not work. Moreover, in this case there is only one problem: no fuel enters the cylinder. And there may be several reasons for this problem, and you have to find that very reason.

First, try disconnecting the fuel hose and observing the fuel pressure. A weak, intermittent flow indicates a clogged filter. Take it out, rinse and dry it, and if possible, replace it with a new filter. Also clear the breather (valve) of any blockages.

Check the condition of the carburetor filter and, if necessary, rinse it thoroughly, dry it and reinstall it. We described in detail about setting up the carburetor above, and these actions in this case will also not be superfluous.

If the reason is not in the breather or in the carburetor, then everything may turn out to be trivial. Make sure there is enough fuel in the tank.

There may also be problems with the cylinder-piston group (abbreviated CPG) of the Partner chainsaw. This failure can be considered serious because the cylinder and piston are the basis of the engine. Therefore, the CPG is an expensive component, the cost of which reaches half the cost of the entire tool.

The power of a chainsaw directly depends on the coordinated operation of the cylinder and piston. During operation, especially if operating rules are not followed, the cylinder, piston and rings may wear out. In this case, only replacing parts will help.

CPG parts may be damaged mechanically. These defects can be diagnosed independently. Remove the muffler. You can see the CPG in the hole. Scratches and scuffs on the surface of the cylinder, located randomly, occur when debris, fragments, or solid foreign particles enter.

If the cylinder is darkened, and this defect is observed over its entire surface, then, in all likelihood, you filled the chainsaw with low-quality fuel. Bad gasoline also affects oil scraper rings. A worn surface of the cylinder on the muffler side is a sign of critical overheating of the chainsaw during operation. Minor mechanical damage can be corrected by replacing bearings, rings, etc. But in case of deep scuffing, the CPG will have to be completely replaced by contacting a partner chainsaw repair shop.

How to prevent chainsaw damage

Repairing a chainsaw can be very expensive in some cases. This can be avoided if you pay enough attention to the prevention and control of the condition of the instrument and all its parts. Moreover, it is not difficult to fulfill this condition - just use the operating instructions and adhere to rational accuracy:

To keep it in working order, you just need to strictly follow the instructions and follow some general rules:

1. Do not allow the engine to overheat, take breaks in operation so that it can rest and cool down.
2. Do not load the chainsaw beyond the capabilities of its class. For example, if you are using a household grade Partner 350 saw, then it is simply not designed to work for more than 40 minutes a day.
3. Check the chain brake daily (this is done at maximum acceleration).
4. Follow the manufacturer's requirements regarding the quality and composition of the fuel mixture.
5. Check the condition of the spark plug weekly and clean the electrodes if necessary.
6. Before using the saw, make sure the chain is sharp and installed correctly. Pay attention to the wear of the cutting links and sharpen them in a timely manner. Watch for cracks and breaks in the rivets.
7. A properly tensioned chain does not sag, but it can be moved by hand. Never do this with a hot chain! Sharpen and/or tighten it after replacement.
8. When refueling the chainsaw, make sure that dirt and other foreign particles do not get into the tank along with the fuel. Fill oil and gasoline carefully, do not spill them.

Often, when contacting a service center, it turns out that the Partner chainsaw broke down due to improper starting of the tool. Therefore, there is only one universal solution when a saw breaks down: handle it correctly, and most problems can be avoided.

And if you are interested in the reasons for breakdowns of the Stihl chainsaw, the second popular brand together with Partner, then the next article is about exactly that.

And for those who like to know more, we suggest you watch the video about chainsaw repair Partner

One of the most popular household chainsaws in Russia is the 350th saw model from Partner. This can be explained by a number of advantages of this model.

The most important qualities of such saws, which characterize them on the positive side:

• compactness and light weight with sufficient power;
• relatively affordable price;
• durability;
• excellent repair base.

DIY chainsaw carburetor repair Partner 350

The carburetor parts of the Partner 350 chainsaw do not experience strong mechanical and thermal loads during operation, unlike, for example, a piston system. Therefore, in theory, there is nothing to break in it. In practice, after many years of operation, gaskets most often depressurize and the elastic membrane fails. Over time it can become tough.

In addition to breakdowns, the carburetor of the Partner 350 chainsaw may fail due to contamination. For repairs and cleaning, the carburetor is removed and disassembled.

It is worth noting that the accelerator pump of the Partner 350 carburetor is its weak point.

How to remove and disassemble: step-by-step algorithm

Before removing, the carburetor of the Partner 350 chainsaw and the space around it must be cleaned with a brush so that dirt does not get inside the engine. After which they remove:

• Air filter.
• Fuel hose.
• Throttle linkage.
• Then the screws securing the carburetor to the engine body are unscrewed.

After removal, place the carburetor on a clean surface and unscrew the screws securing the cover to the body. Remove the cover and gasket. Parts and fasteners are laid out sequentially. Disassembly is carried out slowly, remembering well which part was removed from where

It is extremely important not to confuse screws H and L when assembling. They are the same in shape, but different lengths

After the operations have been completed, the Partner 350 carburetor is available for cleaning.

This is what a half disassembled carburetor looks like

Cleaning the carburetor: basic points, how to clean it correctly

Whether the carburetor is clean or not is usually determined immediately, visually.

First of all, the smallest holes become contaminated - in the nozzle, diffuser, channels. There may be dirty sludge in the chambers. The disassembled carburetor body and parts are washed in a bath of gasoline or kerosene. Then the channels and holes are blown out with a car pump or air compressor. It is best to use a special nozzle with a thin channel at the end. Wash again.

During assembly, if necessary, replace the gaskets and membrane with new ones from the repair kit.

When cleaning the carburetor, be sure to clean the hole in the cover under which the membrane is located. Marked in the photo with a red square

Repair kit: what is included in it and where to buy

Repair kits are sold with two sets of configurations.

The first includes gaskets and a membrane, that is, non-metallic spare parts. The second one additionally comes with a crosspiece with a needle valve.

Repair kits cost approximately from 300 to 370 rubles. and are sold in specialized stores and on many online platforms.

Oil pump repair and drive sprocket replacement

Repair of the oil pump on the Partner 350 chainsaw is necessary if the oil supply has completely or partially stopped. The oil pump mechanism includes the pump itself and a gear with a worm gear, which is driven by a sprocket connected to the clutch.

The most common problem with an oil pump is missing threads and splines on the gear or splines on the worm gear. The situation can be corrected by replacing the parts with new ones.

Chainsaw Partner 350 with Malfunctions and their elimination. Malfunctions and their elimination

Chainsaw Partner 350 malfunctions mainly due to violation of operating rules. Eliminating most problems requires experience working with gas-powered tools and knowledge of the operating principles of two-stroke engines.

But, as practice shows, repairing a chainsaw with your own hands is possible even in the field. The main thing is that before repairing, correctly diagnose the cause of the breakdown, so as not to do unnecessary work and not aggravate the situation.

Breakdowns of a new tool are most often associated with the fuel system, and a saw that has already worked for a long time, having worn parts, can make troubleshooting very difficult.

Therefore, it is important to carry out timely adjustments and preventive maintenance, so that later you do not have to carry out repairs yourself in inappropriate conditions.

Why won't it start

If the chainsaw does not start, there may be several main reasons; they are listed in order of frequency of occurrence:

• lack of fuel in the gas tank;
• the stop toggle switch is not moved to the working position;
• the safety brake is engaged;
• the carburetor is clogged or not adjusted;
• The ignition system is faulty.

The first three reasons for device failure occur among inexperienced users, and the last two require immediate intervention.

It is easy to determine if the ignition system is faulty. You need to unscrew the spark plug and, if it looks good, lean its threaded part against the metal surface of the tool, then pull the starter. A spark jumping indicates that the ignition is working properly.

Fuel system malfunctions are caused by:

• clogged carburetor jets;
• fuel filter clogged;
• violation of the integrity of fuel hoses;
• incorrect setting;
• loss of crankcase tightness (failure of crankshaft seals or crankcase gaskets).

If the saw starts and stalls, first you need to adjust the idle speed, since this adjustment most often goes wrong.

The engine stalls when you press the gas in the following cases:

• incorrect adjustment or clogged jets;
• automatic brake activation;
• excessive chain tension.

The chainsaw stalls under load, mainly only when the carburetor malfunctions. With a light load, the saw may work normally, but it does not reach maximum power and stalls.

How to adjust a chainsaw

Do-it-yourself carburetor adjustment may be required during operation of the saw and after repairing the fuel system. Adjusting the carburetor of a chainsaw is a responsible matter.

Incorrect carburetor settings will, at best, lead to increased fuel consumption, and at worst, to engine failure.

To adjust the carburetor there are 3 screws:

• T - idle speed adjustment;
• L — fuel quantity screw for adjusting power at low and medium speeds;
• H - quality screw for adjusting maximum speed.

If the carburetor has been repaired or cleaned, adjust the chainsaw using the following procedure:

1. Fully tighten the quantity and quality screws and then loosen them 1/5 of a turn.
2. Start the chainsaw and let it warm up for 10-15 minutes.
3. Tighten the quantity screw L until the speed reaches maximum. From the found position, turn it back a quarter turn.
4. Use screw T to adjust the idle speed. It is necessary to set the value when the engine runs steadily and without interruption, and the saw chain does not rotate.
5. Use the quality screw H to adjust the maximum speed on the tachometer. If there is no tachometer, then adjust until the sound of the engine begins to resemble the sound of a four-stroke engine. Exceeding the permissible number of maximum revolutions is fraught with damage to the cylinder-piston group.

The ignition system, with the exception of spark plugs, rarely fails.

If the chain is not lubricated

Chain lubrication is important to reduce link friction in the guide bar grooves. To adjust the lubrication system, an oil supply screw is provided. The chain is lubricated only while it is moving. You can check the operation of the oil pump by pointing the toe of the tire towards a light-colored surface. When you press the throttle, oil splashes should appear on the surface.

Why else might a chainsaw stall when you press the gas?

If after adjusting the chainsaw carburetor the problem remains, then you should resort to checking a number of other factors. There are enough such factors, and they must be checked sequentially, moving from easier to more complex. It is in this order that we will consider all the reasons why the chainsaw does not develop high speeds and stalls. It should be noted that in this case the tool starts and works properly at idle speed.

1. Check the chain tension - if you tighten the cutting element too much, this will create a strong load on the engine. In this case, it will be difficult for the high-speed engine to turn the chain, as a result of which we get it to stop working. The problem can be corrected if the chain tension is adjusted correctly. The chain should rotate easily by hand, but also keep in mind that it should not move at XX. If the chain moves at idle, then you need to adjust the upper XX screw

2. The quality of the fuel mixture and the correctness of its preparation. It is recommended to use AI-92 gasoline for chainsaws. It is mixed with two-stroke oil in appropriate proportions. Although the mixing proportions are indicated on the label of the oil container, you must use the data provided by the tool manufacturer. The optimal mixture of gasoline and oil is 40/1, that is, for 1 liter of gasoline you need to add 25 ml of oil. The proportion means that for 40 liters of gasoline you need to add 1 liter of oil. If you do not adhere to the manufacturer’s recommendations, this will ultimately negatively affect the operation of the carburetor and the serviceability of the CPG
3. Muffler - very often sawmills do not pay due attention to the exhaust system of the tool. If the muffler becomes clogged, and this inevitably happens over time, this will negatively affect the operation of the engine. Mufflers on chainsaws are either collapsible or non-dismountable. In non-separable devices, the connections are flared, so in case of clogging, you need to either replace the part or flare it for cleaning. A clogged muffler affects the operation of the tool, so you should not wait until the chainsaw stops starting

4. Air leakage - parts and mechanisms of the chainsaw are connected to the cylinder through sealing gaskets. As a result, such connections are sealed, which is important for the operation of the internal combustion engine. You can verify this malfunction by tightening the bolts and nuts that secure the carburetor and muffler. Leaking can also occur due to deterioration of the gaskets, which should be replaced on the tool
5. Fuel and air filters are elements responsible for filtering the air and fuel mixture. If the air filter is clogged, then when the throttle opening is increased, sufficient air will not flow into the carburetor, which will lead to flooding of the spark plug. As a result, the engine will stall when trying to develop maximum speed. If the fuel filter is faulty, the required amount of fuel does not enter the carburetor. Its deficiency leads to the fact that the tool cannot develop speed and immediately begins to stall

6. Availability of a fuel filter. This element can not only become clogged, but also become disconnected from the fuel hose. As a result, it will turn out that contaminants will get into the carburetor, which will very quickly damage the mechanism
7. A breather is a hole through which air enters the chainsaw tank, thereby preventing the creation of a vacuum inside the sealed container. The breather is located on the gas tank cap or can be built into the wall of the tank. The principle of its operation is such that as the gasoline in the tank is consumed, the container is filled with air. If the breather is faulty, a vacuum is created in the tank, which prevents fuel from being pumped into the carburetor. The breather allows air to flow in one direction and eliminates the possibility of fuel leaking out of the tank. You can repair the part using a thin needle, which makes a hole

8. CPG malfunction - the chainsaw does not pick up speed even if the cylinder-piston group is worn out. To identify this reason, there is no need to disassemble the engine to look inside. You should use a compression meter to check the amount of compression. The normal value should be at least 12 atmospheres, and if the value is lower, then the CPG must be replaced

9. Ignition System - If the engine starts, it is unlikely that the problem is an electrical problem. However, it would not be superfluous to unscrew the spark plug and perform a visual inspection of it. The presence of black carbon deposits indicates the need to check the ignition. The first thing you need to check is the gap between the ignition module and the flywheel, the value of which should be 0.25 mm. The integrity of the armored wire is also checked, and if it is damaged, it must be replaced along with the module. Spark plugs have a corresponding resource, so they need to be changed, first setting the gap to 0.5-0.7 mm (indicated in the technical description for each tool model)

If checking all the reasons does not allow you to achieve a positive result, then you should remove and clean the chainsaw carburetor.

This is interesting!
Make sure fuel is entering the carburetor. To do this, you need to disconnect the hose from the carburetor and look at the activity of the stream. If the fuel flows quickly, then everything is in order, and this factor can be eliminated.

Chainsaw does not idle - repair sequence

There are actually quite a few reasons for this common problem.

These include:

• poor condition of the filters, as a result of which their throughput was impaired;
• breakdown or regular malfunctions of the ignition system;
• arbitrary deviations in the operation of the carburetor caused by shocks or other mechanical influences;
• failure of fixation or formation of a hole in the fuel hose;
• formation of carbon deposits inside the exhaust system;
• the appearance of defects on the surface of the piston, valve or working cylinder.

Before inspecting the internal structure of the chainsaw, you need to inspect the condition of its body. If a dent appears in one of its parts, then it is quite possible that you need to look for the real reason for the loss of speed precisely under the damaged housing wall.

Repairing a chainsaw whose engine randomly loses speed at idle is carried out in the following sequence:

1. The first step is for the operator to remove and inspect the filter. After this, you need to install them in place, remove the fuel supply hose from the carburetor fitting and direct the tube into the container. Then you need to press the hand pump several times to pre-prime the fuel. If gasoline flows into the container evenly, without jerking, then the filter elements are working properly. If this does not happen and fuel enters the container intermittently, the filter will need to be replaced;
2. Then you need to inspect the ignition system. First of all, you need to inspect the standard spark plug. If it is filled with oil and a thick layer of carbon deposits has formed on its walls, then the part will not be able to support the gradual combustion of fuel - as a result, the internal combustion engine of the chainsaw will quickly lose speed. If the spark plug is clean, then you need to check the condition of the ignition coil, namely the distance between it and the flywheel. If it exceeds 0.2 mm, then the gap will need to be adjusted. To do this, you will need to insert a special adjusting shim between the elements and bring the flywheel closer to the coil by turning the 2 upper screws;
3. The third stage is checking the carburetor. In most cases, violating its factory settings leads to a loss of speed in the chainsaw engine. Re-tuning the fuel unit will help solve this problem.

All actions to repair a chainsaw must be carried out very carefully. If the operator damages small parts of the tool during troubleshooting, this will lead to even more serious damage.

Malfunctions leading to improper operation of the chainsaw

There are a number of defects that need to be taken into account when making a diagnosis, as they can lead to interruptions in the operation of the saw.

• Worn crankshaft bearings. When the crankshaft bearings are worn, mileage is inevitable on the main shaft where the flywheel is mounted. In such a situation, it is impossible to adjust the gap between the flywheel and the ignition coil, which leads to interruptions in sparking and unstable operation of the chainsaw.
• Impulse channels are dirty. The pulse channel serves to ensure the operation of the fuel pump; accordingly, its contamination will lead to incorrect operation of the pump and will make the operation of the saw impossible (it will start and immediately stop).
• CPG wear Usually, with excessive CPG wear, there is a decrease in compression in the chainsaw engine, which will certainly affect its ability to develop speed.
• Dirty fuel and air filters.

READ How to Make Your Own Chainsaw

Main types of breakdowns and methods for eliminating them

Before starting work on diagnosing faults and eliminating them, you must prepare the necessary tools.

Due to the fact that a chainsaw is a relatively simple unit, the list of accessories includes the following items:

• a set of flat and Phillips screwdrivers;
• open-end locksmith's wrenches;
• spark plug key;
• socket set with wrench
• Stihl multi-tool.

Multifunctional tool

In order to qualitatively eliminate any breakdowns that occur and restore operational performance, it is necessary to determine as accurately as possible the malfunction that preceded the failure of the unit. Based on the fact that the chainsaw is equipped with an internal combustion engine (ICE), the main causes of breakdowns should first of all be looked for in the power unit.

The most common faults when repairing a Shtil 180 chainsaw include:

1. the engine does not start;
2. the engine runs intermittently, and when running for a short time, the chainsaw spontaneously stalls;
3. oil leaks near the chain lubrication mechanism;
4. the engine does not develop full power.

Frequent breakdowns of the transmission part of the saw include rupture of chain links. You can independently restore its integrity by riveting the links or replacing them with a new one.

Despite the relative simplicity of the design and the absence of complex mechanisms, experts recommend troubleshooting in a certain order. First of all, the presence of the mixture in the fuel tank is checked, and if everything is in order with the liquid level, you need to proceed to inspect the chainsaw starting unit. If this mechanism is also in normal condition, you need to check the functionality of the spark plug.

After performing the manipulations to diagnose the spark plug (determining the presence or absence of carbon deposits, the correct gap between the electrodes, the condition of the o-ring), we turn our attention to the carburetor. Due to small sawdust, dust and soil particles, the fuel system often becomes clogged.

If cleaning the carburetor of a stihl 180 chainsaw did not help restore the unit to its previous performance, the reason most likely lies in the cylinder-piston group (CPG). The power unit is one of the most complex mechanisms of the tool, the diagnosis of which requires almost complete disassembly.

Fuel system problems

The first stage of diagnosing the fuel supply system is checking the level of the fuel mixture in the tank.

The main components of the fuel system of the 180 Shtil chainsaw

Even if the owner is sure of the availability of gasoline, this makes it possible to eliminate the vacuum created as a result of a clogged bypass valve. It is designed to optimize pressure in the tank with fuel consumption. To make it easier to clean the chainsaw breather, use a regular medium-sized sewing needle.

When inspecting the fuel system, you should pay attention to the integrity of the pipes, the tightness of which may be compromised by mechanical damage or long-term operation of the unit. Sometimes the cause of mixture leakage and, as a result, incorrect engine operation, is wear of rubber gaskets and primer (choke button)

In this case, to repair the Shtil 180 chainsaw with your own hands, you need to purchase a repair kit for seals and replace them.

Problems with the starting and ignition mechanism

The cause of problems with a chainsaw of this model may be a malfunction of the ignition system and the engine starting unit.

General view of the 180 chainsaw ignition

If no deviations are detected when measuring the gap between the flywheel and the module, you need to pay attention to the spark plug. Shtil 180 chainsaw starter assembly

Shtil 180 chainsaw starter assembly

Having removed the spark plug from the shaft, we measure the gap of the chainsaw spark plug between the central and side electrodes. If its value is excessive (more than 0.7-1.5 mm), a spark may occur periodically, and if it is minimal (less than 0.7 mm), it may not be sufficient for optimal ignition of the fuel mixture.

If gasoline enters the combustion chamber, and no discrepancy in the ignition system has been identified, the likely cause of the breakdown may be the carburetor. This unit is designed to mix fuel with air and supply them to the cylinder. After dismantling the carburetor, we clean its channels and jets using universal products.

After diagnosing the ignition system of the Shtil 180 chainsaw and restoring it, we move on to finding problems in the power unit, namely in the cylinder-piston group of the saw.

Owner reviews and how much it costs

The popular chainsaw Partner 350 or 350S costs about seven thousand rubles, the reliability and durability of the tool are superior to cheap analogues.

The modification of the Partner P350 Chrome saw has an increased operating time of the motor, since among the features of this model is the shiny surface of the cylinder.

Nikolay, 40 5 years old, Rostov region

We accepted Partner after years of using a cheap Chinese saw. So, the cost is significantly higher, but with active use, the price of consumables (oil and gasoline) should cover everything, because fuel consumption is significantly lower.

Peter, 30 5 years old, Voronezh

I bought this on the advice of friends, and I don’t regret it. Over the course of three years of work, I changed the guide rail, and even the fault was 100% mine. There were no more breakdowns. Easy to start, quite powerful for home use.

Characteristics of the Partner 350 chainsaw

This model is in great demand among consumers, but most often it is purchased by summer residents for work on their own plots. The saw is used not only for preparing firewood, but also in construction.

In general, Partner 350 chainsaws are distinguished by their compact dimensions. They are equipped with a rather massive engine. Their main advantages are easy starting and reliable operation due to a well-made electric ignition system and fuel pump.

Using such a chainsaw is not at all dangerous. It has a built-in protective system that automatically activates the inertial brake for the chain. In the same mode, its lubrication is carried out.

There will be no problems starting the Partner chainsaw even in winter, since it has a fuel primer. The starter drum is equipped with an impeller that helps clear dirt. In addition, the manufacturers have equipped the tool with the CCS system. This design traps residual particles and is also used when using the air filter for a long time.

To increase the service life of the chainsaw, the developers made chrome-plated walls on the piston group cylinder. This model also has an ergonomically shaped handle and an anti-vibration system.

Device

the Partner three hundred chainsaw is no different from similar products from other manufacturers, except for the highest quality of assembly and devices. The design is based on a high-speed, two-stroke single-cylinder engine. A special feature of two-stroke engines is that they run on the consistency of gasoline with a special oil, with the help of which the pivot-piston group is lubricated.

Motor rotation is transmitted to the driven saw sprocket through an automatic clutch, which disconnects the motor crankshaft from the drive sprocket when idling.

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The chain is lubricated by an oil pump driven by the clutch, in other words, oil is supplied to the chain only during sawing.

The engine starts with a manual starter.

Features of adjusting carburetors of chainsaws of popular brands with your own hands

Despite the fact that, at first glance, all carburetors are the same, the adjustment of this unit may differ depending on the brand of the tool. The differences may be subtle, but they are there and worth mentioning.

Features of adjusting the carburetor of the Shtil 180 chainsaw with your own hands

The carburetor of the Shtil 180 chainsaw is quite interesting. Its peculiarity is that two of the usual three adjustment screws are missing. Therefore, adjusting the carburetor of the Shtil 180 chainsaw comes down to a simple idle adjustment using a single LD screw. But this cannot be said about another model of the Shtil 250 brand. Here the assembly is almost familiar, with three screws. The only difference is that the idle speed when adjusting the Shtil 250 carburetor is adjusted with screw H, not T.

PHOTO: shopozz.ru Quite a famous chainsaw in Russia – “Shtil 180”

The nuances of adjusting the carburetor of chainsaws, Ural brand

The adjustment is made according to the following algorithm. First, the idle speed is set (idle speed screw) so that the circuit is static. If there is strong smoke from the exhaust pipe, tighten the full throttle screw slightly. At the same time, there will be less smoke and the speed will increase. So, by aligning the screws one by one, you can achieve the optimal result.

PHOTO: your-home-and-garden.rfChainsaw “Ural” is already a classic

Then you should sharply press the gas lever. If the speed goes up quickly, then everything is normal, you can fix the idle screw. If they do not grow dynamically enough, it is worth turning the screw a little full throttle. And after running in, you can already adjust the maximum power.

By the way, a similar carburetor is installed on Taiga chainsaws, which means the adjustment will be identical.

PHOTO: grizzly-tool.com.ua The Taiga chainsaw is equipped with the same carburetor as the Ural one.

Chainsaw “Partner 350”: how to adjust the carburetor

Everything is simple here. The carburetor of the Partner 350 chainsaw is adjusted in accordance with the step-by-step instructions we presented today. But, if any of it remains unclear to the reader, we offer another option. Below is a video of adjusting the carburetor of the Partner 350 chainsaw, which will help you understand this issue.

Watch this video on YouTube

Husqvarna 142: how to adjust the carburetor of this chainsaw with your own hands

And this brand and model have no special features or differences. All adjustments to the carburetor of the Husqvarna 142 chainsaw (as well as 137 or 240 models) are made with your own hands according to a similar algorithm with step-by-step instructions. This is the most common setting option, which is why it was given in the above instructions. For example, the carburetor of the Carver chainsaw is adjusted in a similar way.

PHOTO: besplatka.uaHusqvarna 142 looks quite aggressive PHOTO: krsk.au.ru But the 240th model looks a little softer, but is not inferior in character PHOTO: zubilo-perm.ruCarver are trying to copy Husqvarna’s signature orange color

Starter

The starter mechanism consists of a drum (1) with a cable (2) and a handle (3) and a frame (4) with a return spring. When the handle is raised sharply, the drum ratchet engages the teeth on the engine shaft and turns the crankshaft. When the handle is released, the return spring returns it to its original position.

It takes a certain amount of force to tighten the crankshaft to the speed at which the engine starts. Starting the chainsaw with one jerk often fails, you have to jerk it several times. Various methods are used to make startup easier. enrich the fuel mixture with a carburetor valve or reduce the pressure in the cylinder using a decompression valve (to make cranking easier).

The main and most complex links in the chain are the cutting lines, which are divided into right and left. Upper edge of the tooth. the widest of all elements. It provides a wide cut, eliminating jamming of other links.

The starter mechanism consists of a drum (1) with a cable (2) and a handle (3), and a frame (4) with a return spring. fuel filter installed in the bottom cover and where the filter and numbers are located. When the handle is pulled sharply upward, the drum ratchet engages with the teeth on the engine shaft and turns the crankshaft. When the handle is released, the return spring returns it to its original position.

It takes a certain force to turn the crankshaft at the speed at which the engine starts. It is often impossible to start a chainsaw with one jerk; you have to pull it several times. To facilitate starting, various methods are used - enriching the fuel mixture using a carburetor damper, or reducing the pressure in the cylinder using a decompression valve (to facilitate cranking).

The main and most complex links of the chain are the cutting links, which are divided into right-handed and left-handed. The upper edge of the tooth is the widest of all elements. It provides a wide cut, eliminating the remaining links from getting stuck.

The starter quite often fails. In this case, repairing the “Partner 350” chainsaw with your own hands should begin with the following: unscrew the side cover, which is located next to the gearbox. The starter of the presented saw is located near the motor. In order to inspect this part, the air damper is first removed.

Currently reading: Stihl ms 660 chainsaw instructions

Next you will need to disconnect the carburetor. The starter in this model is connected to the throttle. To separate them, you need to use a screwdriver. If carbon deposits appear on the starter, this part will have to be completely replaced. In this case, an ordinary modification is installed, and finding it in the store will not be difficult.

Spark plug for a chainsaw: why the spark plug floods, gap

Another reason that the tool does not start well and stalls is poor contact between the spark plug and the high-voltage wire. If everything is in order here, but there is still no spark, the ignition unit itself may be broken. Such a breakdown can only be corrected by replacing it.

Air filters should be checked and cleaned from time to time. If you have not checked it since purchase, it could become clogged with dust and cause a malfunction.

In models such as STIHL 180, Ural or Partner 350, the breather becomes clogged, which often leads to breakdown. To clean it, you can use a sewing needle.

On the STIHL 180, Druzhba, Ural and Husqvarna 142 models, the muffler sometimes becomes clogged; it also needs to be checked and cleaned.

If the problem is in the carburetor, then without appropriate experience you should not try to fix it. It is best to turn to specialists.

If, after checking and eliminating the above problems, your saw still does not start, then most likely the breakdown is hidden in the cylinder group.

When, during inspection, you see damage and chips on the piston or cylinder assemblies, these elements will have to be replaced.

If the cause of a chainsaw malfunction is pipes that are leaking, then most likely there is not enough lubricant supplied to the chain. To fix the problem, just replace the tubes and seal the joints with sealant.

Mechanism parts cannot last forever, so they will have to be changed periodically. To find out how long each part lasts, you need to look at the instructions.

How the mechanism works

In fact, all tools, both foreign (Husqvarna, Makita, STIHL, Partner 350), and Chinese chainsaws, and Russian (Druzhba, Ural), are designed identically. Therefore, finding the reason why the device does not start and stalls will not be particularly difficult.

There are four elements where difficulties may arise:

They all depend on each other and interact with each other. If any element does not work correctly, the saw stops working.

Let's start with the fact that all tools start up differently - hot and cold. Two commonly used mechanisms are responsible for this process.

Be sure to look at what is written in the user manual. It states that when turning it on, you need to make sure that the emergency stop brake is engaged. But starting a saw with a brake is much more difficult, so sometimes it’s better not to turn on the brake.

As you can find out from the instructions, inside the body there is a fuel tank and an engine, and outside there is a saw part (bar with chain), a handle and a starter.

First you need to figure out exactly how the tool won’t start. For example, the saw starts up, but immediately stalls, or loses power and cutting quality.

Perhaps interruptions in operation occur due to problems in the engine. But I would not recommend disassembling it right away. It is better to look for the problem from the simplest option.

Signs of a flooded candle

The most striking, albeit obvious, marker of excessive filling of the combustion chamber is expressed in the banal refusal of the engine to start. This problem can be identified by analyzing the actions preceding the start of the saw and the storage conditions of the tool. Perhaps, during the first start with the air valve closed, a stroke was missed and the starter made several extra jerks. If this is the first start, after a long “vacation”, before which the saw worked normally, then it is likely that the fuel was not drained from the system, which has roughened the membrane or needle.

Cleaning the air filter

An extremely simple problem with a corresponding fix. It is quite difficult to miss such an event and usually it is not taken to extremes, however, if a clogged filter takes you by surprise, it is useful to know a couple of nuances. Nylon or felt can be used as a filter material. Nylon air filters can be easily cleaned in soapy water, after which they look like new. Felt elements are almost impossible to clean due to the thick layer of material that absorbs oils.