Do-it-yourself adjustment of the carburetor of the Partner 351 chainsaw

Basic malfunctions and their elimination

One of the most common complaints is that the Partner 351 chainsaw will not start. This may be due to an overfilled engine, an empty fuel tank, lack of spark at the spark plugs, or the fact that the fuel mixture is not entering the carburetor . To troubleshoot, check the presence and level of gasoline, as well as the cleanliness of the fuel filter. If it is dirty, clean it or replace it.

If the engine is not running at full power or stalls when the load increases, it is recommended that you clean or replace the air filter, spark plug, or disable the chain brake. If none of these steps changes the performance of Partner 351, contact the service center for qualified assistance.

Excessive smoke emission during sawing indicates a large proportion of oil in the fuel mixture. Drain the old fuel, mix new fuel and fill it into the tank. And if the engine does not idle correctly, then the reason lies in the carburetor. Try adjusting the carburetor as indicated above.

Chainsaws Partner - features

Many sources claim that it was this Swedish company that produced the first mass-produced household chainsaws in Europe. And this happened in 1949.

Symptoms of incorrect carburetor settings

If the saw idles or the maximum speed is not reached, incorrect carburetor settings are often responsible for this behavior. In today's article we explain how to properly adjust a carburetor. The most common phenomena are. Before changing carburetor settings, some adjustments must be made in advance. First of all, you need to ensure that the fuel filter and air filter are spotless and, above all, clean. This includes checking the spark plugs.

We generally believe that these are good Chinese saws, and this is partly true - most of the Partner chainsaws sold on our market are assembled in China, as is honestly written on their nameplates. But besides China, saws of this brand are also produced in America, Italy, Norway and England, and they can also be purchased in Russia.

Ignition system malfunction

Seals should also be checked. These components may cause this behavior. The device must be in technically perfect condition. Some manufacturers also have other deviations here. This screw is used to regulate the speed and therefore the acceleration phase. This screw is used to regulate the reserve gas. On some devices, this screw may be missing or labeled differently. For this reason, instructions should always be used.

Before adjusting the carburetor, you must complete basic settings. This must be done with feeling. Then unscrew one turn again. In the instructions. Basic settings are used for safe commissioning. Slowly increase engine speed until the chain or rotor stops working and the engine idles. Check the settings again and again.

Also, check the transition between full throttle and idle. This needs to be done carefully in small steps.

Carburetor settings may damage the machine.

For more than 10 years, this brand has belonged to the Husqvarna concern, one of the leading manufacturers in this segment, which affects not only the design features of the saw, but also the widest network of service centers capable of quickly and efficiently servicing it.

Few people know, but for the first time the chain brake of chainsaws and the heated handle system were used on Partner chainsaws, so they should not be underestimated.

Therefore, always work with caution. Manufacturers have provided specifications for the operating parameters. This information should be considered

Since it is not possible to provide exact instructions for all devices, we do not guarantee damage caused by carburetor settings. Fine tuning can only be done using the speedometer

This information should be considered. Since it is not possible to provide exact instructions for all devices, we do not guarantee damage caused by carburetor settings. Fine adjustments can only be made using the speedometer.

This means that the minimum we should have is 8 parts of air for each part of fuel and no more than 18 parts of air for 1 part of fuel. Here we can observe that we need a lot of air to burn 1 part of the fuel. What is a stoichiometric ratio? The stoichiometric ratio is discussed for complete combustion. This ratio will depend on the type of fuel used.

There are about 30 modifications of chainsaws of this brand. From the lowest-power saw Partner 340S produced today, with 1.44 kW of power at 13,500 rpm, to the most powerful Partner 842, with its 1.6 kW at 12 thousand rpm.

But, perhaps, the 350th model remains the most purchased in Russia.

As a fact, we will tell you that to burn 1 liter of fuel we need about 000 liters of air. What are Rich Mix and Poor Mix? We will talk about a rich mixture or a poor mixture in relation to fuel, that is, rich due to the presence of excess fuel and getting rid of us, or poor due to a lack of fuel.

What kind of damage may occur?

Rich mixture: Contains more gasoline than necessary. We remove parts of the air stoichiometrically, so we have an excess of fuel or, what is the same, we do not have enough air. Bad combination: Contains less gasoline than stoichiometric. In this case we have excess air.

Carburetor design

The purpose of the Partner 351 chainsaw carburetor is to prepare and supply the correct fuel-air mixture to the engine.

The carburetor power supply system for a chainsaw engine is designed according to a standard design and includes a fuel pump, a main mixing chamber with a membrane, a throttle and air damper and three adjusting screws (needles). The aluminum body provides technological channels for the movement of the air-fuel mixture.

The throttle valve is a brass plate that controls the amount and speed of air entering through the variable air intake. Tapering towards the center and expanding towards the opposite edge, as in a Venturi, creates a vacuum that traps fuel on its way to the engine.

The pressure in the main chamber of the carburetor is close to atmospheric, but when the engine starts, a vacuum occurs in the air channels. Opening the damper increases the intensity of the air supply, and at the same time the fuel suction force and the number of operating revolutions of the internal combustion engine.

If the chainsaw is difficult to start and stalls, does not produce full power, picks up sluggishly and consumes an excessive amount of gasoline, the carburetor needs to be adjusted.

Need for adjustment

Adjusting the carburetor of the Partner-350 chainsaw is sometimes required; problems often arise, expressed in the incorrect supply of fuel or wear of the engine.
However, there are now signs that the mechanism needs to be adjusted, here are some. When I managed to start the engine, it immediately stalls. Sometimes users have no reason to start it at all, and the reason lies in a lack of fuel or an excess of oxygen. A problem arises if fuel consumption increases, resulting in an increase in the volume of exhaust gases. This sometimes occurs due to the mixture being oversaturated with fuel.

In order to understand how to adjust the Partner-350 chainsaw, it is best to familiarize yourself in more detail with the structure of this unit at the first stage. If you understand the operating principle and components, you will be able to independently determine the cause of the breakdown. The carburetor acts as one of the main parts of the engine, which is necessary for the preparation and subsequent supply of fuel, the latter consisting of fuel and oxygen. If the ratio of these ingredients is violated, the motor may begin to work incorrectly and subsequently fail.

Adjusting the carburetor of the Partner-350 chainsaw is required in the rarest cases; more often, problems arise, expressed in the incorrect supply of fuel or wear of the engine. But there are signs that the mechanism needs to be adjusted, here are some of them. After starting the engine, it immediately stalls.

If you have a Partner-350 saw, you can adjust the carburetor yourself, without the involvement of specialists. Having assessed your capabilities and experience, proceed to disassembly, recommendations for which were presented above. You can then make adjustments and subsequent adjustments.

It is necessary to distinguish between three screws; this is the number of them that the Partner saw has, but in some models the screw is installed in a single copy. The manufacturer designated each with its own letter, which will allow you to understand what the element is intended for. Therefore, the screw under the letter L must be engaged when setting the low speed.

Adjusting the carburetor of the Partner-350 chainsaw is required in the rarest cases; more often, problems arise, expressed in the incorrect supply of fuel or wear of the engine. But there are signs that the mechanism needs to be adjusted, here are some of them. After starting the engine, it immediately stalls.

When it is necessary to adjust the carburetor if the chainsaw is suddenly partner 350, though. In some cases, users cannot start it at all, and the reason lies in a lack of fuel or an excess of oxygen. A problem may appear if fuel consumption increases, resulting in an increase in the volume of exhaust gases. This may occur due to the mixture being oversaturated with fuel.

If you have a Partner-350 saw, you can adjust the carburetor yourself, without the involvement of specialists. Having assessed your capabilities and experience, proceed to disassembly, recommendations for which were presented above. You can then make adjustments and subsequent adjustments.

It is necessary to distinguish between three screws; this is the number of them that the Partner saw has, but in some models the screw is installed in a single copy. adjusting the carburetor on a chainsaw partner (partner) chainsaw partner p350s and. The manufacturer designated each with its own letter, which will allow you to understand what the element is intended for.

The carburetor acts as one of the main parts of the engine, which is necessary for the preparation and subsequent supply of fuel, the latter consisting of fuel and oxygen. If the ratio of these ingredients is violated, the motor may begin to work incorrectly and subsequently fail.

Adjusting the carburetor of the Partner-350 chainsaw is required in the rarest cases; more often, difficulties arise, expressed in the incorrect supply of fuel or wear of the engine. But there are signs that the mechanism needs to be adjusted, here are some of them. After starting the engine, it immediately stalls.

Malfunctions of the “Partner” 351 chainsaw and repair features

neglect of the manufacturer’s recommendations for operation, care and storage of the saw;
purchase of low-quality consumables and spare parts;
unqualified technical support, incl. by users who are servicing the saw for the first time.

The main breakdowns that can occur when using a chainsaw are:

clogging of the muffler - the saw does not work well under load, smokes during operation. Repairs begin with dismantling the muffler, after which it is washed, dried and reinstalled;
problems of the cylinder-piston group - it will be difficult to fix them yourself: special equipment and new spare parts will be required;
gas contamination of the crankcase, which was the result of wear of the piston ring - a spare part that should always be in stock;
fuel supply failure is the result of a dirty fuel filter, which can be washed at home;
the carburetor is clogged or the factory settings are reset - to stabilize the operation, you will need to reconfigure and clean it.

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:

Do not allow the engine to overheat, take breaks in operation so that it can rest and cool down. 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. Check the chain brake daily (this is done at maximum acceleration). Follow the manufacturer's requirements regarding the quality and composition of the fuel mixture. Check the condition of the spark plug weekly and clean the electrodes if necessary. 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. A properly tensioned chain does not sag, but can be moved by hand

Never do this with a hot chain! Sharpen and/or tighten it after replacement. 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

The well-known brand Partner has been producing chainsaws of the highest quality for many years, which can compete with well-known leaders Stihl and Husqvarna, but the prices for Patriot products are much more affordable. One of the best household non-professional models is the Partner 351 chainsaw, the characteristics of which allow the tool to be widely used in various fields. The Model 351 is ideal for the following applications:

pruning;
construction works;
felling of small diameter trees;
procurement work;
formation of tree crowns.

Oil and fuel mixture

For proper and smooth operation of the chainsaw, it must be lubricated. This process occurs automatically, so carefully monitor the presence and level of oil in the tank. If there is not enough lubricating fluid, the guide bar and chain overheat, and, consequently, they wear out quickly.

The American Briggs Stratton engine guarantees long and stable operation when fueled with high-quality fuel. To do this, use a mixture of unleaded gasoline and special oil for two-stroke engines and air cooling in a ratio of 40:1. That is 5 liters. gasoline is mixed with 125 ml. oils It is very important to maintain proportions to ensure the tool is in good condition and performs well. Avoid automobile and marine oil.

Acceleration

Pulling the gas trigger of the chainsaw should increase engine speed from idle to maximum power smoothly and quickly. If the set of revolutions is delayed, screw L must be unscrewed counterclockwise no more than 45 degrees around the circumference.

After setting the acceleration and maximum speed, you should double-check the operation of the chainsaw at idle.

The Partner 351 chainsaw has a serious flaw in the power system, which leads to interruptions in operation. This drawback lies in the adapter installed between the engine and the carburetor (we already talked about this above, we also noted the location of the adapter in the photo).

Over time, play appears at the connection point and the chainsaw begins to suck in air. This malfunction manifests itself as a failure at startup (the saw simply does not start), or during operation in the form of instability of revolutions, they spontaneously rise and fall.

Checking the spark plug

If the chainsaw still does not start, and the reasons and solutions could not be identified, then this is a reason to visit the service center. But if it is not nearby, then you can try to perform a number of other actions, all at your own peril and risk.

Sometimes the only way out is to contact a service center for help.

What other causes of malfunctions could be:

Compression is measured using a device of the same name (compression gauge). It is screwed in instead of a spark plug, after which you need to try to “start” the engine. The reading that appears on the dial will be the actual compression value. The nominal value will have to be found in the engine documentation.

The finger should retract quite tightly, which means that everything is more or less normal with compression. If there is no vacuum, you will have to carry out a major overhaul.

Another problem may be a damaged gasket between the engine crankcase and the cylinder. This can be determined experimentally. Need to:

The combustible mixture may or may not be drawn into the cylinder. In the first case, there are no problems. In the second, there is no compression in the crankcase, so the gasket needs to be changed.

When replacing, be sure to use a sealant to ensure better tightness.

The Partner gasoline saw cannot be called unreliable. For many users it works without problems in winter and summer, for many years. But others complain about the same typical problems:

READ How to Adjust Ignition Partner 350

We invite you to familiarize yourself with Cauliflower at home

All these problems have internal causes in the parts and components of the tool. This means that in order to get to the bottom of it and fix the breakdown, you will have to disassemble the electric saw. This is not as difficult as it may seem, because manufacturers always take this possibility into account.

To independently diagnose problems at home, you need to understand that common chainsaw problems in the vast majority of cases are caused by the same reasons. Therefore, just by the symptoms, you can guess where the source of the problem is.

For example, if a chainsaw does not start, then the reason most likely lies in the ignition system, namely the spark plug. If air leaks into the cylinder, then you need to look for a defect in the fuel system. A dirty filter causes the engine to stall and smoke, and so on. Let's look at these cases in detail so that you feel confident when repairing your Partner chainsaw yourself.

Now that you know what caused the breakdown, it's time to get down to business. A faulty ignition system can only be repaired after disassembly. To do this, remove any remaining fuel from the tank. Then carefully disconnect the wire and remove the spark plug (a special key is provided to remove it).

In addition, in any case, it doesn’t hurt to make sure that the chainsaw’s carburetor is adjusted correctly. Do not begin adjustments until you have cleaned the air and fuel filters. If the filters are ok, use the adjustment screws.

One of them (S) is intended for idling, the other two are for maximum (H) and minimum (L) speeds, respectively. Gradually turn the screws clockwise. After stopping, make two turns in the opposite direction.

A common situation: chainsaw stalls at high speeds, although before that it starts and runs without problems at medium gas. Sometimes at medium it also works intermittently - but at full throttle it immediately stalls. This problem is faced by many users who save on quality fuel.

Low-quality gasoline easily contaminates parts with soot. In this case, checking the filters (air and fuel) will not hurt. Moreover, the muffler suffers from poor fuel and the carbon deposits it creates.

The combustion products of dirty fuel simply clog it, forming an impenetrable plug of soot. This plug greatly reduces engine power. In this case, gasoline is consumed in large quantities, but there is no result in power. Check and clean the muffler:

After following the recommendations for troubleshooting, install the muffler in place, fill the saw with high-quality (!) fuel and start it.

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.

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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.

Chainsaw Partner. Carburetor repair, adjustment.

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 the oil scraper rings. A worn surface of the cylinder on the muffler side is a sign of critical overheating of the chainsaw during operation.

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

Filters

If the chainsaw has been running for a long time, it is possible that the air or fuel filters may become clogged. In the first case, the required portion of air will not enter the cylinders, and combustion of the fuel mixture will not occur. If the fuel system is clogged, the supply of gasoline mixture will stop.

The air-cleaning element should be removed carefully; dust should not get into the carburetor. The element needs to be blown out, washed with soap and water, dried and then reinstalled.

To check the condition of the fuel filter, you need to remove the hose from the carburetor and try to pump fuel manually. If the stream is too weak or completely absent, the filter needs to be replaced or washed. You can purchase a new one from a dealer, or go to a power tool repair shop.

Video

The author of the video explains in detail what caused this problem on the Partner 351 chainsaw and how to fix it with your own hands.

Causes of chainsaw malfunction

A chainsaw, like any device powered by an internal combustion engine, has an ignition system. It is responsible for igniting the fuel-air mixture in the engine cylinder. This occurs through the application of an electrical discharge, which pierces the space between the spark plug electrodes.

Chainsaw trigger

It is clear that without igniting the fuel, not a single engine will start or operate. However, this is not the only problem: the quality of the chainsaw’s operation depends on how accurately the ignition is set. In other words, whether the fuel ignites on time or at the wrong time. Therefore, a chainsaw with lost settings needs repair. You can entrust the troubleshooting to an experienced mechanic, but you can repair the chainsaw ignition yourself.

Some Chinese chainsaws come with low-quality spark plugs - perhaps it makes sense to have several spark plugs in the kit. In our review, we will introduce you to the design and operating principle of the ignition system, its main problems and how to fix them.

Most often, we think about repairs after the chainsaw stops starting, or visual signs of serious damage appear.

If the chainsaw does not start, then you need to carry out step-by-step diagnostics. It is recommended to go from simple to complex and do everything in order. Although devices from different manufacturers differ from each other, they have the same operating principle and layout: they are based on a two-stroke gasoline engine, which rotates a tensioned cutting chain through a gearbox.

Diagnostics must be carried out sequentially:

Each of the four stages must be considered separately.

It is recommended to use a compressor to blow through engine parts. The use of technical gases (especially oxygen) is prohibited.

Checking the spark plug

Perhaps you need to install new spark plugs

READ Stihl 180 Chainsaw Starts Poorly

The operation is similar to that carried out by all motorists with gasoline engines. If you have a new and 100% working spark plug in stock, then the easiest way is to install it and try to start the chainsaw. The old one should be inspected: heavy carbon deposits indicate that the engine is not working properly.

The spark must be bright. A dim one indicates that either the wire itself does not conduct a sufficient amount of current, or it is time to throw away the spark plug, or the ignition unit - the magneto, which distributes charges among the cylinders in accordance with the engine strokes - is faulty.

You can try to disassemble the ignition unit, clean the contacts, dry it, reassemble it and try again. A number of faults cannot be eliminated, so in some cases the unit will require replacement, but this is a last resort.

First you need to prepare your workplace:

The chainsaw itself needs to be cleaned and blown with compressed air. Now you can start diagnosing.

After assembly, you need to check: if, as a result of manual pumping with the supply tube removed from the carburetor, the gasoline mixture flows in a dense stream with jerks, then the system is working. If the chainsaw still does not start, then the carburetor .

In this case, you need to pay attention to the quality of the mixture. It is not recommended to leave gasoline in the tank for a long time after work; it is better to drain it into a separate container and then dilute it with fresh fuel. Otherwise, when using an old (14 days or more) mixture, harmful substances will be released, which will be deposited on the surfaces of the elements of the engine piston system.

Failure of the cylinder-piston group

Most of them lead to the inability to start the engine, as the pressure in the cylinder drops. There are several options for repairing and checking the condition of the cylinder-piston group (CPG).

For example, you can measure compression in the engine. For this operation, a compression gauge is used, which is mounted in the spark plug hole. In this way, you can check the condition of the CPG parts.

To look at the side surface of the cylinder, you need to remove the muffler and look into the opened gap. Although the view is limited, the general condition of the CPG can be seen.

To accurately assess the performance of the cylinder-piston group, you will have to completely disassemble the chainsaw engine. First, the crankcase is disconnected from the cylinder, after which the piston is pulled out. If it has chips, burrs and large scratches, then it needs to be replaced.

Low compression most often occurs when the piston ring is coked and damaged. Be sure to check that there is no carbon deposits on it. In addition, it must sit freely in the piston groove and be pressed against the cylinder surface.

In general, you should always keep the chainsaw and its various holes clean. This is the only way to avoid many breakdowns and further repairs. Be sure to watch the video on how to do it correctly.

https://youtube.com/watch?v=1il-477Qcns

Repair of the Partner 351 chainsaw carburetor (main faults and their elimination)

Even a very careful and correct adjustment of the carburetor may not solve some of its malfunctions and the problems they cause in the operation of the Partner 351 chain saw. If the adjustment fails to restore the normal performance of the internal combustion engine power unit, it will need to be dismantled, disassembled and repaired.

In some cases, interruptions in the operation of the carburetor are associated with clogging of jets, fuel and air filters and, as a result, “underfilling” of fuel. The main symptoms of this problem are loss of power and unstable engine operation. The cause may be trapped dust, small debris and even water drops, and frozen water in the carburetor completely blocks the fuel supply channels.

If there is a compressor, all carburetor channels are purged with compressed air, and if the procedure does not help, wash it in an ultrasonic bath (suitable for jewelry or for washing optics) using a special carburetor fluid. During the cleaning process, the use of metal needles, wire, fleecy or “loose” cloth is prohibited.

Along with “underfilling” of fuel, its “overfilling” is also considered a malfunction.

There are often cases when a chainsaw begins to operate unstably due to a leak in the seal, which is formed due to a burst spacer between the carburetor and the chainsaw engine (pictured below). The only way to solve the problem is to replace it with a working one.

Adapter between engine and carburetor of Partner 351 chainsaw

Types of carburetors for Partner 351 XT

The Partner 351 and Partner 351 XT chainsaws with a slightly more powerful engine are equipped with identical WT 391 carburetors, interchangeable with the Walbro WT 891, W 20, WT 89, WT 324, WT 600, WT 624, WT 637, WT 662, and Zama models C1U-W8 and C1U-W14.

The carburetor of the Partner 351 chainsaw, with proper adjustment and timely maintenance, ensures high performance of the tool, turning it into an indispensable assistant in the garden, in the garden or at a construction site. By learning to properly regulate the operation and eliminate the most likely malfunctions of the “heart” of the internal combustion engine, you can extend the life of the chainsaw and avoid downtime when working with it.

Advantages and disadvantages

The main task of the engines of power tools, in particular chainsaws, is stable and confident operation in any position in relation to gravity. This feature, provided by a diaphragm carburetor with a built-in pump, along with its design simplicity, is a significant advantage of the Partner 351 internal combustion engine power unit.

The disadvantages of the carburetor include the relative complexity of adjustment, a narrow range of the amount of mixture at the outlet, and slow transitions between steady-state modes. In addition, it is sensitive to accelerations directed perpendicular to the membranes.

Additional recommendations

If you purchased a Partner-350 saw, the carburetor can be adjusted during operation. Before carrying out this work, you must remember that the factory settings are optimal. Using the screws described above, you can adjust the operation of the motor in special situations, including different climatic conditions. When adjusting, use the screws marked L and H. To increase the speed, turn them clockwise.

To lower the speed, the screws are turned in the opposite direction. It is also important to take into account the sequence of use of the elements, which looks like this: L – H – T. If during the adjustment you encounter difficulties, then it would be best to contact a specialist, because incorrect adjustment can damage the motor.

Advantages and disadvantages

Acceleration

After setting the acceleration and maximum speed, you should double-check the operation of the chainsaw at idle.

Advantages

Economical maintenance – inexpensive spare parts and consumables.
Stable performance characteristics throughout the declared resource.
Rational combination of weight, size and saw power.
High degree of ergonomics – well-balanced design and ease of use.
Reasonable arrangement of internal components and mechanisms + optimal access to making the necessary settings.
High maintainability - owners can fix most of the faults themselves, without the help of specialists.

Weak trigger mechanism.
Inability to visually control the amount of fuel and lubricants.
High demands on fuel quality.
Insufficient level of vibration damping system.

Carburetor design

The purpose of the Partner 351 chainsaw carburetor is to prepare and supply the correct fuel-air mixture to the engine.

If the chainsaw is difficult to start and stalls, does not produce full power, picks up sluggishly and consumes an excessive amount of gasoline, the carburetor needs to be adjusted.

Principle of operation

The carburetor is needed to prepare the air-fuel mixture to power the engine. If the proportions in this consistency are incorrect, the operation of the motor is disrupted. If the proportion is not observed in the direction of increasing the amount of fuel, the mixture is called oversaturated, but if there is not a lot of fuel, it is called lean. Both this and this do not have the best effect on the operation of the engine.

In different models of chainsaws, carburetors differ in design, but in terms of their operating principle they are identical. The air flow moves at high speed along the air channel. The damper that blocks the channel allows you to change the speed of the air stream. Fuel is supplied through a sprayer into the channel, where it is mixed with incoming air, forming an air-fuel mixture. The purchased mixture enters the engine.

The pressure in the float chamber, where the fuel is located before mixing, is actually equal to atmospheric pressure. But a vacuum is created in the air channel, so fuel is drawn into the air flow. The more the damper opens, the faster the air moves, and the amount of fuel also increases - the engine speed increases. This is how you can imagine in a simplified way the principle of operation of a carburetor.

If you purchased a Partner-350 chain saw, adjusting the carburetor may be useful during use. In order to carry out these actions correctly, you also need to become familiar with the mechanism of operation of this piece of equipment. The fuel is sprayed into the diffuser by a stream of air, which allows you to create a mixture that is pumped into the cylinder.

Settings

Procedure for adjusting the carburetor:

Carefully unscrew the cap of the tank created for fuel water.
Drain the remaining working fluid and completely dry the container.
Run the engine at idle speed to get rid of all remaining fuel.
Allow the engine to cool for 5 minutes.
Unscrew the idle speed screw.
Using a special wrench, unscrew the spark plug of the engine starting system.
Pour 10 ml of clean motor oil into the ignition chamber, which is used for two-stroke engines.
Pull the starter cord.
Replace the spark plug.
Adjust the screws in the following order: T, L, H. Screw T is adjusted with the engine turned on counterclockwise until the chain mechanism stops completely. Screw L is turned a quarter turn, screw H is also turned a quarter turn counterclockwise.

What carburetor is used on the Partner 351 chainsaw

The original Chinese-assembled Swedish chainsaw Partner 351 is equipped with a Japanese two-stroke carburetor with a built-in Walbro WT391 diaphragm fuel pump. If the internal combustion engine power supply unit has been replaced with a Chinese analogue, it means that the chainsaw has already been repaired.

Why the carburetor floods: causes and solutions

In the vast majority of cases, the cause of fuel overflow is a rough or worn membrane that puts pressure on the rocker arm connected to the needle. But the problem may also lie in damage to the needle, valves and levers involved in the operation of the unit. In these cases, it is necessary to completely disassemble the carburetor to determine the cause of the malfunction, and then replace unsuitable consumables.

Before disassembling the carburetor, it is recommended to wash the outside of it with gasoline; reassembly is carried out only after thorough cleaning, drying and treatment with compressed air.

Partner P350 carburetor adjustment

To troubleshoot problems associated with fuel overflow, a repair kit for the Partner 351 chainsaw carburetor will be useful, which includes all the necessary spare parts and consumables.

Idling

Smoothly turning screw L in one direction or the other, find the position at which the speed is maximum.
Turn screw L a quarter circle counterclockwise.
When the chain rotates at idle, turn screw T to the left until it stops.
If after adjustment the engine starts poorly or stalls quickly, you need to unscrew screw L another half turn and adjust screw T again.

Setting up the carburetor of a Chinese chainsaw

For the break-in mode, so that the parts receive sufficient lubrication, the Husqvarna chainsaw carburetor is adjusted in such a way that the highest speed is at 600–700 rpm. below working. If it is not possible to set the highest operating frequency using the tachometer, it is not worth changing the preparatory options with screw H.

For precise adjustment, the saw must be warmed up for more than 10 minutes and placed on a level surface. The tire should be oriented away from the person doing the adjustment. At the initial step, you should find the highest value of the idle speed. To do this, turn screw L smoothly, first from left to right, then opposite. When the highest speeds have been experimentally found, screw L should be unscrewed counterclockwise by a value from 1/8 to a quarter of a full turn.

The standard position for “Chinese” carburetors is the position of the screw L, at which it is loosened by one and a half turns from the one hundred percent clamped position. For screw H - one revolution from the same state. On many, screw L is called adjusting the consistency property, and screw H is its quantity. The idle speed is adjusted in the same way as described above, on a warm engine.

On the Russian market you can find not very high-quality counterfeits of the Partner 350 chainsaw, which is not only additional evidence of its popularity, but also harms the brand as a whole. Well, other models of this brand are a success among summer residents and farmers.

Not a very high-quality vibration damping system, as a result of which the hands get tired quite quickly. But, taking into account the fact that this is a household tool that requires 15 - 20 minutes of rest every 20 - 25 minutes of work, you can put up with this drawback.

Oil leakage from the chain lubrication system, which, in general, plagues most chainsaws equipped with it, including the more famous relative of Partner chainsaws - Husqvarna. (link)

Lack of visual control over the oil level, which is not very comfortable to work with, and operating the saw without lubrication will lead to rapid stretching, overheating and wear of the chain.

Dear readers, if you have any questions, ask them using the form below. We will be glad to communicate with you;)

Sources:

https://benzopilok.ru/brend/partner/351-benzopila.html https://vseopilah.ru/sabelnye-pily/regulirovka-pily-partner/

Do-it-yourself adjustment of the carburetor of the Partner 351 chainsaw

You can adjust the carburetor of the Partner 351 chainsaw yourself. Its adjustment is made with three screws, marked in Latin letters L, H and T. The letter T indicates the idle speed adjustment screw, H for high speed, L for low speed.

The adjustment process involves two stages: basic and final. The exact value of the rotation angles should be indicated in the detailed operating instructions for the Partner 351 chainsaw.

To access the carburetor you need to remove the top cover of the chainsaw Adjusting screws L and H

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.

Setting up the carburetor

The Partner 351 chainsaw has several operating mechanisms that require periodic inspection and maintenance. One of them is a carburetor.

It is not recommended to repair the carburetor of the Partner 351 chainsaw with your own hands, but it is possible to make minor adjustments. There are two main breakdowns that can be fixed by adjusting the carburetor yourself:

The chain spins while the engine is idling. To correct the problem, use the adjusting screw. First, turn it completely clockwise. Then make 4.5 turns counterclockwise. The fault should disappear.
Incorrect supply of fuel mixture. There may be several reasons. From unbalancing adjusting screws to breaking carburetor parts. In any case, the adjustment follows the same pattern.

To adjust the carburetor, there are three adjusting screws: L – for high speeds, H – for low speeds, T – idle speed of the Partner 351 chainsaw.

“PARTNER 350” Correct carburetor adjustment.

The adjustment begins with screw T. To do this, start the saw and turn the adjusting screw counterclockwise until the chain stops.
Then turn screw L a quarter turn counterclockwise. During adjustment, the idle speed should have the largest turns.
Screw H is turned a quarter turn counterclockwise.

After these manipulations, a tachometer is taken and the revolutions are checked. They should correspond as much as possible to the speeds indicated in the passport of the Partner 351 chainsaw. If you still decide to adjust the carburetor of the Partner 351 chainsaw with your own hands, we recommend reading the article about adjusting the carburetor on a chainsaw. This general article contains all the necessary information and will greatly help you in this difficult process.

Carburetor adjustment screws

Checking and adjusting the carburetor

New chainsaws come with a factory carburetor adjustment, but for them to work properly you will need to lower the maximum engine speed. This is necessary in order to achieve maximum efficiency of the tool.

The reason for checking and adjusting the carburetor of a chainsaw may be increased fuel consumption. But problems in the operation of a tool do not always lie in the carburetor. Before you start setting it up, you need to make sure that there are no problems with the air filter being clogged, that the exhaust system, as well as the ignition system, is working correctly. If there are no problems and the engine is running stably, then we can say with confidence that the chainsaw carburetor needs to be cleaned and adjusted.

Chainsaw carburetor adjustment diagram:

Preparing a carburetor adjustment kit. To perform the adjustment perfectly, it is best to use a special tool - a tachometer, which will accurately determine the maximum number of engine revolutions. You will also need to use a slotted screwdriver.
Almost every carburetor model has 3 adjusting screws (L, H, T). Do-it-yourself adjustment of the chainsaw carburetor begins with screw L (low speed). It is necessary to turn on the chainsaw and begin adjusting low speeds. Once the required parameters have been achieved, the screw must be turned counterclockwise 1/4 turn.
Then you need to adjust the idle speed of the chainsaw carburetor (using screw T).
After this, it is necessary to adjust the maximum engine speed; to do this, tighten screw H. The throttle handle is pressed all the way, after which the screw is tightened to maximum speed, after which it is turned ¼ clockwise. It is best to carry out this procedure using the tachometer. It is also worth remembering that such manipulation must be carried out as quickly as possible, since maximum speed is very dangerous for the engine.

After completing the steps, you need to let the tool cool, then start it again and check how the chainsaw will work at idle. If, after adjustment, insufficient power is detected, screw H will need to be adjusted again.

Instructions for starting a chainsaw

The Partner 351 chainsaw works on the same principles and has a similar design as other gas-powered tools:

Before turning on for the first time, all components of the Partner 351 chainsaw are securely screwed on, and the integrity of the body is checked.
Before each start, the chain tension is checked. If necessary, the chain is tightened or relaxed using the adjusting screw.
Before each start, the oil quantity is checked.
The chainsaw can only be started from a hard surface. The foot should press the instrument firmly to the ground.
Before starting, the damper is set to the “open” position.
The start button is moved to the “on” position. after which you need to press the primer 5 times and start pulling the starter cord. The main thing is to start the chainsaw smoothly, without jerking.
After starting, the engine should idle for 60 seconds. Then you can get to work adjusting the power using the throttle.

Launch of the Partner 351 XT chainsaw

Instructions, operation and maintenance

If you purchase a new chainsaw or start the device after a long period of inactivity, you must:

screw all components or check the tightness of connections;
adjust the chain tension with a screw on the side of the housing;
check the oil level and fill the saw with freshly prepared fuel mixture;
place the device on a flat horizontal plane and press it with your foot;
open the damper;
move the control lever to the on position;
Pump up the gasoline 5 times with primer and pull the starter;
Let the saw warm up for a minute and start working.

Chainsaw device:

housing with fuel tank, oil tank;
handle holders - front, rear;
saw blade - bar, chain.

Chainsaw Partner 351 XT

assemble the chainsaw according to the instructions for the tool;
adjust the carburetor using the idle speed screw, remember that the carburetor is adjusted at the factory during assembly of the saw, the recommended number of revolutions at working speed is 9000 per minute;
check the condition of the muffler every time before starting work;
storage duration of the fuel mixture is 4 weeks;
Clean the air filter every 50 hours of operation;
The spark plug is replaced every 30 days.

The fuel mixture is represented by a combination of one liter of AI-95 or AI-92 gasoline with 20 grams of oil for two-stroke engines. It is recommended to use high quality oil, as otherwise a large layer of soot will form, which will lead to operational problems.

The chainsaw is designed for 30-40 minutes of operation with a full fuel tank. The rate of fuel consumption depends on the operating mode, the number of engine revolutions, the load on the tool and the frequency of turning the engine on and off during the cutting process.

Operating rules

Working with the Partner 351 chainsaw can be much more convenient and safer if you adhere to the following rules:

The saw should be as close to the body as possible - this way, the hands get tired less, and balance is maintained much easier.
When changing position, you must turn off the chainsaw motor using the chain braking activator.
Before starting work, it is necessary to determine the direction in which the tree will fall. In this case, it is necessary to take into account the slope of the soil, the tree itself, and the direction of the wind. There should be no people or animals nearby.

Like any saw, Partner 351 is also prone to problems. The most common ones include:

Lack of engine starting: due to flooding of the combustion chamber or spark plug with fuel, their clogging. In the latter case, it is necessary to clean the clogged components. When flooding, remove the spark plug and dry the chamber using idle winding.
Muffler malfunctions: caused by using the wrong fuel mixture or low-quality oil. The muffler should be cleaned.
Interruptions in chain lubrication: seal failure. Clean the lubricant pumping tubes or replace them.

Do-it-yourself repairs and basic faults

During operation of the Partner 351 chainsaw, various breakdowns and malfunctions may occur. Some of them can be fixed with your own hands, without contacting service centers and repair shops.

When the engine is running, a lot of black smoke is emitted, does the chainsaw stall at high speeds? Most likely the muffler is clogged. To fix the problem, you need to remove it and remove all debris and carbon deposits. Over many years of operation, the muffler of the Partner 351 chainsaw, and not only that, becomes heavily clogged with carbon deposits. After wet cleaning, the muffler should dry. During repairs, the inlet from the muffler is covered with a piece of cloth.
No fuel supply? There may be several reasons:

The fuel filter or opening in the fuel tank is clogged. To fix it, you need to remove and clean the fuel hose or breather.
Problems with carburetor adjustment, including clogging of its channels and membranes. The carburetor of the Partner 351 chainsaw consists of many small parts. For repairs, it is better to contact a service center.
Lack of fuel in the tank. To fix it, you need to pump up the fuel and fill the tank.

Problems in the cylinder-piston group, namely loss of engine power or crankcase gas contamination? Such malfunctions are extremely rare; accurate diagnosis and elimination may require special equipment or a complete replacement of the cylinder block with the piston. You can try to visually assess the condition of the system; to do this, you need to remove the muffler:
If there is a loss of engine power, then most likely there is a compression problem. To diagnose, you need to use a pressure gauge to measure the pressure in the cylinder. If it is significantly less than the standard indicator of 8-9 atmospheres, then a complete replacement of the cylinder-piston unit will be required.
If there is intense formation of gases in the crankcase, then you need to carefully examine the condition of the piston ring. Any microcrack or chip on its surface violates the tightness of the system. The ring must be removed and replaced. To do this, it is better to contact a repair shop.

Cylinder - piston group Partner 351

You can learn more about solving problems with idle speed and engine starting in the Partner 351 saw repair video.

In the segment of non-professional chainsaws, Partner 351 (Partner 351) occupies a worthy place. Lightweight, productive and reliable, the saw allows you to perform a wide range of wood sawing tasks at the household level.

The chainsaw is ideal for working in a summer cottage. It copes well with felling small fruit and berry trees and trimming branches. With its help you can work in the forest with small diameter trunks. Partner 351 is suitable for construction work.

Basic malfunctions when using gasoline saws

You should start adjusting the carburetor only after making sure that the cause of the malfunction is due to a malfunction in its operation. Therefore, it is necessary to analyze the possible causes of failure in the operation of a gasoline engine. Table 1 shows the main malfunctions and causes of their occurrence in most models of gasoline tools.

Table 1: Main malfunctions in engine operation and solutions.

Users note the main signs when carburetor settings are violated:

The engine starts with great difficulty or cannot be started at all.
During operation, dips are observed when pressing the throttle control lever.
The engine cannot develop the required power; when the throttle is fully opened, a stop is possible.
Excessive level of smoke, increased noise during operation, accompanied by shots in the intake tract.
Unstable operation in different modes.
Low rotation speed of the chain drive when setting to automatic maintenance mode.
Increased gasoline consumption when performing work. The sign is very subjective, based on a comparison of indicators during different periods of operation.
Clogging of the intake system when removing the air cleaner. It is also possible that the material used for air purification may become clogged.
Wear of the cylinder-piston group. Carburetor adjustments will have a temporary effect.

Attention! If dirt gets into the power system, you will have to not only regulate it. There will be a need to wash individual components and parts

This video shows the simplest option for purging the intake system:

Specifications

The Partner 351 saw has good power and performance despite its compact size and weight of 4.7 kg:

motor power 1400 W (1.9 hp);

tire 35 cm. It is possible to install a tire 41 cm;

56 link chain with 3/8 inch pitch;

spark plug - Bosch WSR 6F;

fuel tank capacity 380 g;

oil tank 200 g;

noise level is just over 100 dB.

The air filter operating on the CCS system helps to significantly reduce fuel consumption. The double air purification system increases the service life of the Partner 351 chainsaw motor. The chain operates at high speeds.

Thoughtful ergonomics and a reliable vibration damping system allow you to use the tool for several hours without interruption.

The chain brake works instantly, which makes working with the chainsaw even more comfortable and safe.

Sources:

https://petsjoke.ru/kak-otremontirovat-svoimi-rukami-benzopilu-partner-351/ https://vsekarby.ru/benzoinstrument/benzopily/karbyurator-partner-351.html https://benzopilok.ru/brend /partner/351-benzopila.html

Chainsaw device Partner 351

The Partner 351 chainsaw has a standard design. The tool is equipped with a reliable 2-stroke gasoline engine with a cylinder capacity of 38 cm3 and a power of 1.4 kW. To start the engine, the manufacturer provided a trouble-free manual starter, the resistance of which was reduced by 30%. Modern assembly and layout of the starter makes it possible to start the Partner 351 chainsaw at any time of the year, placing minimal load on the engine and other mechanisms of the tool. An effective forced air supply system is responsible for cooling the engine.

The Partner 351 chainsaw includes a durable ignition system and a branded Bosch WSR 6F spark plug. A well-assembled ignition system and its optimal combination with the clutch makes the starting and operation of the tool more stable and efficient.

The working parts of the model are represented by a tire and a chain. A separate sprocket located on the side of the model is responsible for chain tension. Free access to the sprocket allows you to quickly adjust the chain tension without the use of tools.

All internal spare parts of the Partner 351 chainsaw are placed in a durable case. It is made of high-quality multi-layer polymer, which gives the case the ability to successfully withstand falls from low heights and accidental impacts on foreign objects.

The body of the model is designed in such a way as to give the operator free access to the main consumables of the model. Thanks to this, the feller can quickly repair the tool right in the field.

Model specifications

The Partner 351 chainsaw has good technical performance. Model specifications include:

power – 1.9 l. With.;
capacity of the tank for filling fuel – 380 ml;
capacity of the tank for filling oil – 200 ml;
the recommended length of the tire used is 35–40 cm;
chain pitch – 3/8 “;
number of saw chain links – 56;
ready-to-use weight – 4.7 kg.

The Partner 351 model stands out for its modest dimensions and light weight. This makes it possible to confidently use it at height without additional insurance for the operator

An important advantage of the tool is its low noise level. When the saw engine is running at maximum speed, this parameter is 106 dB

Problem: chainsaw stalls after starting

When a chainsaw starts and stalls, it is due to the carburetor or other parts. Causes of malfunction:

If the chainsaw stalls when you press the gas, then you need to inspect the gasoline and air filters, as well as the fuel pump.

In order for the chainsaw to start, you need to accurately determine the cause of its malfunction, and then try to fix it yourself. If the problem is not found or you cannot fix it yourself, then it is better to seek help from specialists.

Starter device

Often, chainsaw manufacturers equip their units with starters that work on almost the same principle, namely: in a groove in the saw body there is a handle through which the cord is passed. When the handle is suddenly lifted, the cord is also pulled out, which engages the ratchet drum. Thus, a drum with spokes, which is located on the shaft, is activated.

The design and principle of operation of a chainsaw starter

As the power of the chainsaw increases, the amount of fuel mixture increases, which must ignite when the chainsaw is started. In this case, to start the engine, it is necessary to increase the number of pulls on the starter cord. To speed up the return of the drum mechanism, manufacturers use a special steel starter return spring, which has excellent elasticity.

Chainsaw starter spring

If the spring breaks, you must: remove the mechanism cage, pull out the spring, fixing its upper part with your finger and slightly pulling the starter handle to the side. Then, wind the new part, while avoiding kinks and twisting of the new spring element, then carefully fix the clip.