Do-it-yourself adjustment of the carburetor of the Poulan 2150 chainsaw

Who produces

The Poulan chainsaw is a development of the famous American brand, which was founded back in 1944 by K. Poulan with the goal of making people’s work easier, primarily associated with gardening. The garden tool invented by the American company quickly became popular at home and abroad. Poulan chainsaws and other units are still manufactured by this well-known company in the USA, they are a quality product whose reliability has been proven for decades.

Important! When choosing a Poulan saw, you need to pay attention to the marking with the country of origin.

Chainsaws of this brand are produced using original technology only in the USA. However, you can find such saws in stores that are made in China (which is no longer strange today) or in Europe. The quality of the instrument largely depends on the country of origin.

Malfunctions in the cylinder-piston group

Wear of the cylinder and piston, the appearance of scratches and scuffs on their surface, wear of piston rings or crankshaft bearings - all this is very serious damage. As a result, they lead to a drop in pressure in the cylinder. In this case, it will be very difficult to start the engine.

Without disassembling, you can check the condition of the CPG as follows. Remove the muffler and look out the window that opens. Part of the surface of the cylinder will be visible. To obtain information about the condition of the CPG, compression in the engine is measured using a compression meter, which must be installed in the spark plug hole. By turning the crankshaft (you can use the starter), measure the readings of the device. The compression meter readings should be no lower than 8-9 kgf/sq.cm (or 0.8-0.9 MPa).

If you don’t have a compression gauge, you can eyeball the presence of compression by simply plugging the hole in the spark plug socket with your finger and pulling the starter, as shown in the photo below:

If there is compression, you will feel your finger being sucked inward.

The cause of low compression may be coked piston rings or their wear.

Features of Poulan chainsaws

The production of gasoline saws is considered the first production established in the company founded by Poulan. For their technical characteristics, these American saws have received due recognition from their owners in our country.

Among the features of Poulan brand chainsaws are the following:

• the use of relatively inexpensive, but high-quality and reliable material in the design of the tool;
• high guarantee of safety when working with the tool;
• availability of a reliable and high-quality engine;
• sufficiently high power, but at the same time light weight of the tool;
• ease and convenience of work due to mobility;
• multifunctionality.

Review of popular Poulan chainsaw models

Let's get acquainted with some popular representatives of the Poulan brand and their characteristics in more detail.

Poulan 2150

The Poulan 2150 chainsaw is one of the most purchased representatives of the entire model range of the American brand in our country. Refers to household saws. However, with a power of 1.3 kW, it can be used for work beyond simple construction and renovation.

Poulan 2150 is characterized by a structure typical for a number of chain saws. The internal contents, protected by a durable plastic case, consist of a carburetor, a two-stroke engine, an ignition system including a coil and a spark plug, a starter - starting device, a fuel pump designed to pump gasoline into the carburetor.

The Poulan 2150 chainsaw, like all other modern chainsaws, has two tanks: fuel for the engine and oil for lubricating the chain. The fuel oil-gasoline mixture is prepared in a ratio of 1/50. The chain and bar are automatically lubricated, which increases the service life of the cutting set.

This model has the following features:

1. The high-strength plastic from which the saw body is made can withstand any damaging impact.
2. The material of the side part is aluminum alloy.
3. The handles have a convenient location for working with the saw.
4. The durability of the motor is ensured by an additional protective layer that covers the cylinder-piston group.
5. The anti-vibration system, made of steel springs, successfully dampens all unnecessary vibrations.
6. The oil pump required to supply oil to the chain has no manual adjustment.
7. The presence of a primer that serves for instant start-up at any operating temperature.
8. Nylon filter, easy to maintain and replace.

Poulan 2150 also has a tire length of 40 cm, a crankcase and gas tank volume of 0.2 l and 0.35 l, respectively, and a weight of 4.7 kg.

Poulan 2250

The Poulan 2250 chainsaw has many useful functions in everyday life. Great for gardening. But in order to perform more complex work, it is better to purchase a professional model.

Has the following features:

1. To protect the cylinder-piston group from corrosion, chrome plating is used.
2. Chain brake that can be activated either by inertial force or manually.
3. Automatic oil supply for lubrication of the cutting set (manual adjustment is not provided).
4. Primer is a pump that pumps fuel for cold engine starting.

In addition, this model has a power of 1.3 kW, a tire length of 40 cm, crankcase and fuel tank volumes of 210 ml and 360 ml, respectively, and a tool weight of 4.7 kg.

Poulan 1950

This tool has an average price. Poulan 1950 is popular among people who are just starting to work with gasoline saws, and among professionals who have been working with wood for a long time.

This model also has a carburetor engine with a nominal displacement of 36 cm 3 . Power is 1.3 kW.

Features of the Poulan 1950 saw:

1. Characterized by good structural balancing.
2. High quality saw set. The bar length is 40 cm, the chain pitch is 3/8 inch.
3. Adjusting the oil supply for chain lubrication. The amount of lubricant supplied corresponds to the load of the gasoline engine.
4. Easy to clean nylon filter.
5. The presence of a primer that makes it easier to start a cold engine.

At the end of the review of three chainsaw models from the Poulan tool range, a few words need to be said about how these saws can be repaired and maintained. When searching on the Internet for a Poulan 2150 chainsaw instruction manual or a Poulan 2250 chainsaw instruction manual, etc., you may come across some difficulties. They are connected, first of all, with the fact that if the chainsaw is original, i.e. made in the USA, you cannot find instructions in Russian. If you encounter problems working with these saws, you can use the articles of our compatriots, based on personal experience in using Poulan chainsaws. Many useful articles on chainsaw repair can be found on our website in the Maintenance and Repair section. Most chainsaws from all manufacturers are not very structurally different from each other (Poulan is no exception), so the algorithm for troubleshooting carburetor faults will be the same on both the Poulan and Partner saws. We'll talk about the features of the Poulan carburetor below.

Engine

In most cases, the following problems occur in engine operation:

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

How to check crankshaft seals

The presence of oil seal leaks can only be checked by getting to the crankshaft itself and carefully examining it for leaks. You can see how to do this correctly in the video:

How to check compression on a chainsaw

At a compression level below 8 atmospheres, the engine will not have enough power, which means the chainsaw will not be able to fully function.

To measure compression you need:

1. Remove the protective cover and unscrew the spark plug.
2. Insert the tip of the compression gauge into the hole where the spark plug should be located.
3. Using the starting cord, rotate the piston and remember the maximum readings of the measuring device.

How to properly install a piston on a chainsaw

The work of replacing the piston for most models of modern chainsaws is carried out according to the following algorithm:

1. The top and side covers are removed.
2. The candle is unscrewed.
3. The stoppers are removed from the shock absorbers and the handle is disconnected from the body.
4. The drive sprocket and starter are removed.
5. A piston stopper is installed in the spark plug hole and the nut securing the flywheel and clutch is unscrewed.
6. The flywheel, clutch, and worm drive of the oil pump, located immediately behind the clutch mechanism, are removed.
7. The screws securing the carburetor and air filter are unscrewed, after which these components are removed along with the engine control lever.
8. The ignition coil is removed, as well as the muffler.
9. The saw is turned upside down and, by unscrewing the screws securing it to the body, the engine is disconnected.
10. The pan is unscrewed and the piston is removed.
11. Since the piston is removed only together with the crankshaft, to disconnect it it is necessary to remove the retaining rings.
12. The old piston is replaced with a new one, but as carefully as possible. This is caused by the high fragility of compression rings.
13. The crankcase is put in place, and sealant is used instead of a gasket.

All subsequent actions are carried out according to the reverse algorithm of disassembly.

Carburetor adjustment

The operation of power units is based on a fuel-oil mixture produced by a carburetor in a volumetric ratio of 16/1.

Note! A mixture that is too lean or too rich has a negative impact on drive traction and economic and operating resources.

During production, carburetor adjustment is carried out standardly according to average parameters; the totality of external factors is not taken into account. The sequence of actions when setting up the fuel systems of chainsaws of different representatives of Poulan differs slightly.

Ensuring good throttle response and stable idle speed is achieved by bringing the composition of the gasoline-oil mixture to a given ratio by rotating the quality screw and the quantity screw.

The carburetor adjustment of the Poulan saw and step-by-step instructions are described in great detail, clearly and clearly in the following video

Fuel system

Malfunctions of the fuel system are also quite often the main reason that prevents a chainsaw from working as efficiently as possible. First of all, you need to check the quality of the fuel mixture.

Some owners prefer to use alcohol-containing solutions rather than the recommended brand of gasoline, or add more oil than required.

Gasoline leaks from a chainsaw

If gasoline drops periodically appear on the body of the chainsaw, then it is necessary to check the tightness of the fuel tank. Over time, it may dry out. Or the gasket has become “stiff” and it can no longer perform its direct function.

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

Gasoline does not enter the chainsaw cylinder

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

• The air filter is clogged.
• The carburetor settings have been lost.
• The carburetor membrane is no longer intact.
• The channels through which gasoline is transported are clogged.

Chainsaw won't idle

In this case, you should start looking for a problem with the filter elements. For the most part, it is precisely because of the reduced capacity of the air and gasoline filters that the idle speed begins to “float”.

If everything is in order with the filters, then you need to check the components of the gas supply system, and also make sure that there are no spontaneous changes in the carburetor settings.

Reviews

Reviews that can be found on the Internet:

I do part-time work in forestry. The workers there use, of course, professional saws, and they gave me a Poulan chainsaw. I liked the unit, it is easy to start and convenient. Vibrates to a minimum, works for a long time without cooling, even when it’s hot outside. (Dmitriy).

I have been using a Poulan saw for almost 5 years, the experience is positive, I am satisfied with the reliability of the plastic parts. (Fedor).

Of course, there are reviews pointing out some shortcomings of these saws. For example, owners talk about the lack of visible control of the amount of fuel and oil in filling containers.

Advantages and disadvantages

Speaking about technical characteristics and parameters, ergonomics and efficiency, reliability of materials, mechanism and parts, the American Poulan saw has a lot of advantages.

• reasonable price for tools, spare parts, repairs and maintenance;
• reliability and excellent quality, which guarantee a long service life without frequent and serious breakdowns;
• economical consumption of fuel and lubrication oil;
• ergonomic design, convenient design of the body and position of the handle, so that the operator does not get tired;
• good vibration absorption system.

Speaking about shortcomings in the design and operation of the Poulan 2150 chainsaw, relying on reviews and the manual for the tool, it is difficult to identify them even after several years of active use.

TOP 2 reliable and convenient models of American Poulan chainsaws

A chainsaw is a tool that many residents have in their workshop. The Poulan chainsaw is in great demand. This device is a good helper in the garden and during repair work, when creating carpentry. The model is affordable and easy to use. Over the decades of existence of the product, its shortcomings have been corrected, leaving only good indicators. American saws are often found among Russian owners and are distinguished by high quality and reliable operation.

Poulan chainsaw device

The Poulan chainsaw is manufactured in the USA using original technology. In stores you can find models made in China and Europe. The quality of the instrument depends on the country of origin.

The chainsaw is an American invention. Its features:

• Inexpensive but reliable materials of high quality are used in the design;
• the tool ensures work safety;
• a well-assembled engine operates reliably and for a long time;
• with a low weight the saw develops more power;
• the device is lightweight and easy to use;
• The tool is multifunctional.

Chainsaws are available in several types. They are slightly different from each other, but the basic principles of operation are similar for all models. The tank is filled with gasoline, and lubricating fluid is poured into the oil container. Power units work and force the chain with teeth to move. Let's look at some models.

The design and principle of operation of the carburetor

The main purpose of a carburetor in any internal combustion engine is to mix fuel with air in certain proportions. If they are violated, the engine starts to work incorrectly or stops completely.

Chainsaw carburetors of different brands have some differences in design, but the main components of this part, as well as the principle of their operation, are approximately the same:

• The base (body) is a wind tube with an air damper located across it. Its purpose is to regulate the air supply to the inner chamber.
• The float chamber is a container that holds the fuel mixture in a stable state.

• The atomizer is the area where air and fuel come into contact. Fuel enters the atomizer from the float chamber through a nozzle.
• A diffuser is a part that increases the speed of air flow, with the help of which the required pressure is maintained. The diffuser is located in the narrowed part of the tube.

The operating principle of the carburetor is as follows:

1. After the engine starts, the damper opens and air enters the channel.
2. The flow rate and the level of the float in the chamber are regulated by the position of the damper, due to the difference in pressure in the float chamber and the air channel.
3. Fuel from the float chamber is sucked into the nozzle and then into the diffuser. Moving through it, the air captures the incoming fuel.
4. The resulting mixture is fed into the cylinder cavities through the intake channels.

Poulan 2150

This type of device is the most purchased in Russia. The unit belongs to the category of household saws. The power of 1.3 kW allows it to be used not only in everyday life. The structure of the product is typical for saws from many manufacturers. The Poulan 2150 chainsaw has a durable plastic body, a two-stroke gasoline engine, carburetor, ignition system, starter and pump. The ignition system consists of a coil and a spark plug. The starter is used to start the device, the pump pumps fuel from the tank to the carburetor.

The unit cuts wood in natural conditions and indoors. You can use the saw for felling wood, creating blanks used in construction work, and cutting firewood.

The saw is equipped with two tanks: fuel and oil. The first one is filled with gasoline to run the engine. In oil - lubricating oil for the chain. To operate the Poulan 2150 engine, a mixture of gasoline and oil is prepared in a ratio of 1/50. The chain and bar are automatically lubricated. The model has some features:

• The high quality plastic body can withstand impacts;
• the side part is made of durable aluminum alloy;
• the handles are located in a convenient position for work;
• the cylinder-piston group is covered with a protective layer;
• vibrations are damped by a special system;
• the oil pump for lubrication of the chain is deprived of manual adjustment;
• for quick start in any conditions there is a primer;
• The nylon filter is easy to maintain and easy to replace;
• tire length - 40 cm, crankcase capacity - 0.2 l, fuel tank capacity - 0.35 l, product weight - 4.7 kg.

These are the main characteristics of the saw.

Poulan 2250

The Poulan 2250 chainsaw is equipped with many useful functions. She performed well in the garden. It is not suitable for more complex work. Peculiarities:

• the piston group is chrome plated;
• the chain is stopped by a special brake;
• the cutting set is automatically lubricated;
• there is a primer for starting the engine in the cold season;
• tire length - 40 cm, engine power - 1.3 kW, crankcase volume - 210 ml, gas tank - 360 ml, total weight - 4.7 kg.

It remains to get acquainted with the less common models.

Less popular modifications

There are varieties that are not in demand in our country, for example Paulan 1950. This chainsaw is characterized by the following qualities:

• has good balancing;
• the saw set is of high quality;
• bar length - 40 cm, chain pitch - 3/8″;
• the amount of chain oil is adjusted automatically depending on the engine load;
• There is a nylon filter and primer.

Poulan 2550 is the company’s most powerful saw. The engine has a volume of 40 cm³, engine power is 2.4 liters. With. Designed for felling and bucking dead wood up to 40 cm in diameter. You can prepare timber for construction, build log structures in the form of log houses. The main advantage of the saw unit is long-term operation of the engine without loss of quality.

Filter

A “rich” or “lean” fuel mixture will sooner or later cause a breakdown. Perhaps even expensive. To prevent this from happening, it would be a good idea to regularly check the filter for abrasions, as well as for breaks in the filter fabric itself.

How to check the fuel filter and replace it

To check the current condition of the fuel filter, you must perform the following steps:

1. Remove the fuel hose from the carburetor fitting and direct it into a working container.
2. Press the so-called “paging” button several times.

If gasoline flows unevenly and jerkily, then it’s time to install a new filter element. This is done quite simply:

1. The fuel tank cap is unscrewed.
2. Using tweezers or any other device, the filter itself is removed.
3. After disconnecting the old filter, you need to install a new one and lower it into the fuel tank.

How to clean the air filter

If a sufficient amount of air is not supplied, the fuel mixture becomes too rich, which leads to disruption of normal engine operation. Regular purging of the air filter, and in particularly advanced cases, washing in a soapy solution will help avoid such problems.

Please note that washing in acetone, gasoline or other aggressive solutions is not allowed. This may lead to damage to the integrity of the filter element.

User manual

Owners often face a problem: it is difficult to find instructions written in Russian. Let's compose it ourselves. Operating instructions for the Poulan chainsaw:

1. A saw is a tool that can do both good and harm. It must be handled with care.
2. It is necessary to periodically clean the unit, adjust the main systems and replace consumables.
3. Use chains for Oregon 91VJ or 91VG models.
4. The tool has a comfortable grip and good balancing.
5. Has high performance.
6. It is recommended to run-in the unit without load before using it. To do this, you need to burn about 3 tanks of gasoline (about 1 liter).
7. To assemble the tool, you must use a combination wrench.
8. Install the bar, put the saw chain on it and tighten it with two nuts.
9. A-92 gasoline mixed with oil in a ratio of 50/1 is poured into the gas tank.
10. The work area must be prepared: children and pets must be removed.

The requirements of the manual are mandatory.

Carburetor adjustment

The engine operates based on a mixture of gasoline and oil. A rich or lean mixture negatively affects traction and reduces the life of the unit. At the factory, the chainsaw carburetor is adjusted according to average values. When adjusting with your own hands, you should remember that the composition of the mixture can be changed by rotating the screw for the quantity and quality of the mixture.

To properly adjust the carburetor, you need to know its structure and the purpose of each part well. Only in this case can the setup be done by hand.

If you have no knowledge, it is better to contact a service center where specialists work and have the necessary equipment.

On the carburetor, some adjusting elements cannot be unscrewed. They have heads with special slots that our screwdrivers do not fit into.

Repair work

If there are problems with operation, you can repair the chainsaw yourself. This device has a high level of maintainability. Spare parts are sold in special stores and are easily replaced. The advantages of the Poulan model range include:

• affordable prices for spare parts;
• economical consumption of oils and fuel;
• easy access to all product systems;
• use of oil from European manufacturers.

The package includes instructions with a list of recommendations, which includes:

• preparing the saw for work;
• systems maintenance;
• starting the engine in winter.

In case of malfunctions, the culprits may be:

• low quality fuel and lubricants;
• poor cleaning of the air filter;
• debris or drops of water getting into the carburetor;
• faulty spark plug;
• short circuit in the wiring;
• excessive chain tension;
• Incorrect carburetor setting.

The saw's ignition system is electronic. It does not require care or maintenance. You just need to monitor the quality of the spark plug and wires.

DIY chainsaw repair

A chainsaw, even if one wants to, cannot be classified as a complex device. Moreover, the simplicity of the design is its distinguishing feature. Nevertheless, repairing a chainsaw can take a lot of time. The difficulty lies not in the repair itself, but in accurately diagnosing the malfunction. The same symptom of inoperability can be caused by many reasons. Therefore, before you immediately begin disassembling the carburetor or engine, you need to think carefully and analyze the symptoms of the malfunction. No chainsaw repair manual can replace simple logic.

Chainsaw repair

All malfunctions of chainsaws can be divided into two main groups: malfunctions of the engine with all its components and systems (ignition, fuel supply system, cylinder-piston group, exhaust system) and malfunctions of other components (chain brake, lubrication system, clutch, tire, etc. .).

Engine malfunctions

Malfunctions in the operation of chainsaw engines occur quite often, and it is their detection and correction that takes the most time from users. Basically they come down to the following manifestations:

• The engine will not start;
• starts but stalls;
• works unsteadily;
• does not develop power, i.e. It runs fine at idle, but stalls under load.

When repairing a chainsaw with your own hands, you need to use the method of elimination - check one by one all possible causes of the malfunction, starting with those that take less time to check and eliminate (see here about the design and operation of a two-stroke engine).

. Almost all types of engine problems listed above can be caused by ignition system failures. Therefore, when they occur, it makes sense to start troubleshooting with a spark plug. This is all the more justified since the state of the latter can provide useful information about the operation of the fuel system. So, if a problem occurs, you need to unscrew the spark plug and inspect it.

Chainsaw ignition system: 1 - flywheel with built-in magnets, 2 - ignition module, 3 - spark plug, 4 - high voltage wire.

The wire is disconnected and the spark plug is unscrewed with a special wrench.

Unscrewing the spark plug

If the spark plug is dry, this means that the problem is most likely not in the ignition system, but in the fuel mixture not entering the cylinder. You can wrap the spark plug back and get to work on the fuel system. If the spark plug is heavily splashed with fuel mixture, it means there is an excess of it. This may occur due to carburetor misadjustment or violation of starting rules. The spark plug is wiped and dried, the cylinder is dried by turning off the fuel supply and operating the starter to ventilate the combustion chamber and remove excess fuel. Then install the spark plug in place and repeat the start.

The presence of a large amount of black carbon also indicates a malfunction in the fuel system.

Candle with black soot

The ratio between oil and gasoline in the mixture may be incorrect, the carburetor may not be adjusted, or low-quality oil may be used. The spark plug is washed in gasoline, cleaned of carbon deposits with a needle or awl, the electrodes are cleaned with fine sandpaper and replaced.

In all these cases, it would be a good idea to check the gap between the spark plug electrodes. Depending on its brand, it should be in the range of 0.5-0.65 mm. You also need to check the spark plug seal. If it is worn out or damaged, the tightness of the combustion chamber may not be ensured, which leads to a decrease in compression in the cylinder and problems in engine operation.

Even if, when checking the spark plug, there is good reason to believe that the fault is in the fuel system, you need to check the spark plug for the presence of a spark. At least to be sure that everything is in order. For this:

• put the ignition cable on the spark plug;
• using pliers with insulated handles, apply the thread or nut of the spark plug to the cylinder;
• pull the starter handle and see whether there is a spark or not.

If there is no spark, you just need to replace the spark plug. If the new spark plug does not have a spark, you need to check the condition of the high-voltage wire for a break and contact with the spark plug.

The reason for the lack of a spark may also be a faulty ignition module or a violation of the gap between it and the flywheel magnetic circuit. It should be 0.2 mm. Violation of the gap becomes especially likely if the saw was previously disassembled and the flywheel and ignition module were removed. The gap is set using a 0.2 mm thick gasket placed between the flywheel boss and the ignition module. A faulty ignition module must be replaced.

Having checked the ignition system in this way and not finding a malfunction, you can move on to the fuel mixture supply system.

Fuel supply system

. If by inspection of the spark plug it is determined that fuel is not entering the cylinder, all possible reasons for this need to be considered. It could be:

• failure of fuel to flow from the tank due to a clogged hole in its lid (breather), while a vacuum is created in the tank, preventing fuel from leaking out;
• contamination of the fuel filter installed in the tank;
• no or insufficient supply of fuel mixture from the carburetor to the cylinder.

To diagnose the first two reasons, it is enough to disconnect the fuel hose from the carburetor and see whether fuel flows out of it or not. If it flows in full stream, the breather and filter do not need to be checked; if it does not flow or flows weakly, we can assume that the cause of the malfunction has been found. The breather is cleaned with a needle. The fuel filter is removed through the filler hole of the empty fuel tank using a wire hook, along with a suction hose, from which the filter is disconnected and cleaned or replaced with a new one. Chainsaw manufacturers recommend changing the fuel filter every 3 months.

Fuel filter

Insufficient supply of the fuel mixture from the carburetor to the cylinder or a violation of the correct ratio between fuel and air mixed in the carburetor can occur for several reasons: due to a clogged air filter, unadjusted carburetor, clogged channels or filter mesh.

As a rule, repairing chainsaws is not complete without cleaning the air filter, since it gets dirty quite quickly. When this happens, the flow of air into the carburetor is reduced, and the fuel mixture leaving it becomes too rich, which disrupts the normal operation of the engine. You need to carefully remove a dirty filter for cleaning so that dirt does not get into the carburetor. The filter should be cleaned or washed in water with some detergent, dried and installed back.

Air purification system: 1 - cover covering the fine filter, 2 - fine filter, 3 - cover covering the coarse filter, 4 - coarse filter (it may not be present).

Carburetor misalignment can be corrected by adjusting it. This is usually done using three screws - maximum and minimum speed and the idle screw. Adjustment must be carried out in strict accordance with the instructions, failure to comply with which may lead to engine damage. Some saw manufacturers leave only one adjusting screw (idle speed) to prevent unwanted interference by inexperienced users with the operation of the carburetor. For an example of adjusting a chainsaw carburetor, see the article Working with a chainsaw.

If adjusting the carburetor does not help, you need to clean its channels and filter mesh, and at the same time check the integrity of the membrane. The carburetor is one of the most complex devices in a chainsaw, so you need to start disassembling and cleaning it with a full understanding of the responsibility of this operation. It consists of many small parts that have the ability to unnoticeably jump out of their places and get lost irretrievably, so that after disassembling this capricious device, you may not be able to reassemble it.

Chainsaw carburetor. The top arrow is the fuel hose, the bottom arrow is the air damper drive. Chainsaw carburetor. Arrow—throttle valve lever cable. Chainsaw carburetor. Arrow - fuel hose. Disassembled chainsaw carburetor

Below is a diagram of another chainsaw carburetor.

Chainsaw carburetor diagram

If you do not have experience and self-confidence, it is better to entrust the repair of a chainsaw carburetor to a service center specialist. Sometimes, to properly clean the carburetor, it is necessary to use ultrasonic cleaning.

. Often the cause of engine malfunction, especially when the engine runs normally at low speeds and stalls under load, is clogging of the muffler spark arrester with combustion products, which prevents normal exhaust. Repair in this case consists of removing the muffler, disassembling it (if it is dismountable) and wet cleaning it from carbon deposits using detergents. The non-removable muffler is dried with a hairdryer after washing. Remember that carbon deposits contain substances that are carcinogens, and dry cleaning, which could result in their inhalation, is unacceptable. When removing the muffler, plug the engine exhaust hole with a clean rag.

Chainsaw muffler

Some of the reasons why the muffler may become clogged are the use of a fuel mixture with an excessive amount of oil (the amount of oil is more than the manufacturer recommends), and the use of either oil not intended for two-stroke engines or low-quality oil.

. Malfunctions of the cylinder-piston group are among the most serious. This is wear of the cylinder and piston, scratches and scuffs on their surface, wear or sinking in the grooves of the piston rings, wear of the crankshaft bearings. Most of these malfunctions lead to a drop in cylinder pressure and, as a result, the engine is unable to start, or is unable to produce full power. There are several ways to assess the condition of the cylinder-piston group (CPG).

Piston and crank mechanism

You can remove the muffler and look through the window that opens, in which part of the side surface of the cylinder is visible. Despite the limitations of the review, it is still possible to obtain a general idea of ​​the state of the CPG in this way.

It is useful to measure the compression in the engine, which is quite informative regarding the condition of the CPG parts. The operation is carried out using a compression gauge installed in the spark plug hole.

Measuring chainsaw engine compression

The crankshaft is turned using an electric motor (drill) with a flexible shaft or manually with a starter, while monitoring the pressure using a pressure gauge. The latter for a working chainsaw should be no lower than 8-9 atm (0.8-0.9 MPa). As it decreases, engine power also decreases. At a pressure of 5 atm, the engine may work, but only at idle.

It is possible to accurately assess the condition of the CPG only by completely disassembling the engine - by disconnecting the crankcase from the cylinder and removing the piston. If the latter has burrs, chips or deep scratches, it needs to be replaced. With regard to the cylinder, if the surface is worn out or damaged, it is possible to bore it to the repair size. Low compression may also be caused by wear or coking of the piston ring. A working ring should be clean of carbon deposits, sit freely in the piston groove and press tightly against the inner surface of the cylinder.

Chain lubrication system

It’s rare that a chainsaw repair manual goes without mentioning malfunctions of the chain lubrication system, which are quite common. They usually manifest themselves in the lack of or insufficient supply of lubricant to the chain and in oil leaks. If the chain turns out to be dry, first of all you need to inspect and clean the channels through which oil is supplied to the bar. Their clogging is a common occurrence.

Chainsaw oil pump Adjusting the oil pump. 1 - adjustment screw.

If there is a significant (small is considered normal) oil leakage, you need to check the tightness of connecting the tubes to the pump fittings. They may fall off or crack. Violation of the tightness of the oil line, in addition to drips, can also lead to insufficient lubrication of the chain. The pump begins to suck in air, which affects its performance. Violation of the tightness is eliminated by replacing the tubes or sealing them with sealant.

The most serious failure of the lubrication system is cracks in the oil pump housing. In this case, it will have to be replaced.

Chain brake

Failure of the chain brake to operate may occur due to contamination of the underframe space and the brake band with sawdust or grease. This also leads to tape wear. In the first case, you need to clean the under-axle space, in the second, you need to replace the brake band.

Chainsaw brake device

Replacement of wear parts

Some chainsaw parts that are subject to natural wear and tear must be replaced after a certain period of use. Their failure is not considered a malfunction. Wearing parts include a chain, tire, drive sprocket, anti-vibration system elements and some others. If you do not replace wearing parts in a timely manner, their excessive wear will negatively affect the remaining components of the chainsaw. In particular, if the tire and drive sprocket are not changed in time, increased vibration will negatively affect the crankshaft bearings. The maximum working depth of the sprocket teeth should be 0.5 mm. In practice, sprockets are often operated to a wear depth of 1 mm or more, without realizing that this leads to increased load on the crankshaft bearings and their accelerated failure. When 3-4 chains wear out, it is necessary to change the tire itself; by this time its wear reaches its maximum values.

The chainsaw bar wears especially badly in the area where cutting is done most frequently, usually the underside of the guide bar. To ensure uniform wear, each time the chain is replaced, the bar must be turned 180° relative to the horizontal axis.

When installing a new chain, a new drive sprocket should be installed. Since under normal load the service life of the drive sprocket is twice as long as the service life of the chain, it is advisable to use one sprocket for alternate operation of two chains. Thanks to this, the sprocket and chains wear out almost simultaneously. If a new chain is placed on a worn sprocket, the drive links of the chain will wear out much faster. For cost-effective operation of a chainsaw, always use together: one guide bar, two chain sprockets, four saw chains.

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Reviews and prices

Dmitry, Mozhga: “I work in the forest. I don’t have a professional saw yet, I work in Poulana. The unit is good, convenient, easy to start. Even in hot weather it can work for a long time without stopping.”

Fedor, Kanash: “I have had a Poulan saw for about 5 years. I work with it a lot. The plastic is good, the parts of the internal systems are reliable. I'm happy with the device."

Alexander, Ufa: “I’ve been using a Poulan chainsaw for 4 years. Its advantages: ease of maintenance, good balance. Disadvantages: some wear on parts. But it does not exceed the wear of other instruments.”

Evgeniy, Ildibaevo: “I’ve been using Poulan 2150 for a long time. I work on orders, harvest timber. I use the saw often. Recently the piston group flew. I couldn’t find any parts, so I contacted service. We installed parts from another saw. Works great".

The cost of Poulan products is about 5,200 rubles. Some models are sold for 4,700 rubles. Professional tools cost RUB 8,415. Prices in different regions of the country may vary.

Features of use and safety precautions

In order to avoid injury to the operator, before using the Poulan 2150 chainsaw, it is important to study the operating manual in detail, where special attention is paid to safety precautions. Only a rested person who is protected by special clothing can operate a Poulan chainsaw. It consists of safety glasses, earmuffs and gloves, fitted clothing that does not restrict movement and closed, tight boots.

The Poulan 2150 chainsaw runs on a gasoline engine, which means it produces exhaust gases that are harmful and poisonous to humans. It is for this reason that the chainsaw should not be used in closed and poorly ventilated areas, near sources of fire and sparks.

Do not forget that fuel is a flammable liquid and, in order to eliminate the possibility of fire, it is necessary to carefully check the Poulan saw for fuel or oil leaks.

Chainsaw Poulan 2150 – parameters and equipment

The factory equipment of this Poulan model includes a 2-stroke petrol engine with a potential power of 1.3 kW and a working cylinder volume of 36.3 cm3. The engine stands out for its reliability and efficiency. The engine does not tend to increase the amount of fuel consumed even after several years of intensive use.

The model's factory engine includes a 3-section forged crankshaft, which is distinguished by its durability and high wear resistance. The internal and external walls of the factory engine cylinder are coated with a dense chrome alloy, which protects the element from corrosion.

To start the internal combustion engine, the Poulan chainsaw is equipped with a reliable manual starter. In order to be able to work with the tool in winter, the manufacturer included a pump for manual pumping of fuel. A long-lasting forced air supply system is responsible for cooling the standard engine of the model.

The model includes large reservoirs for refilling with fuel and engine oil. This reduces the number of forced breaks when operating the saw. The manufacturer has provided free access to the tank necks, as well as to filters and main serviced mechanisms. This allows the operator to replace a worn part with one key.

The Poulan 2150 chainsaw stands out for its ergonomics and low weight. This makes the tool more convenient when working at heights. The lower, upper and side parts of the saw are equipped with durable protective plastic shields. They prevent damage to the internal parts of the tool and the ingress of dust and sawdust.

The standard bar and chain are responsible for cutting down wood. The saw chain is lubricated automatically. This makes it possible to save a large amount of oil during intensive work in large gardens and forests. An effective hand inertial brake is responsible for stopping the chain when the teeth hit metal objects.

Tool specifications include:

• The power of the standard internal combustion engine is 1.7 liters. With.;
• maximum speed when the engine is idling – 4000 rpm;
• the length of the standard tire used is 40 cm;
• the pitch of the chain provided in the package is 3/8 “;
• working weight – 5 kg.

The manufacturer supplies this Poulan model with everything necessary for assembling and starting to use the tool. The saw set includes repair and operating instructions, a branded bar and chain, a plastic vessel for preparing the fuel mixture, as well as a watering can and a set of keys.

What compression should be in a chainsaw

Today we’ll talk about what compression should be in a chainsaw, or rather about its minimum and maximum values ​​at which the tool remains operational.
Good afternoon, dear subscribers and guests of the channel. I apologize for the long absence of fresh posts. The beginning of winter is a difficult period, you are trying to finish all the unfinished projects from the summer, but as usual there is not enough time.

But let's return to the article. Compression is the pressure that is created in the tool cylinder when the piston is at top dead center. A good compression indicator largely depends on the condition of the internal parts of the engine, namely the cylinder walls, piston and compression rings.

With increased wear of these parts, the compression ratio drops, the engine begins to start worse, and traction disappears. With severe wear and loss of compression, the engine may stop starting altogether.

To check compression, a special device is used - a compression meter. The difference between a compression gauge for a car and a chainsaw is that the latter has a threaded part at the end, which is screwed into the cylinder instead of a spark plug.

To check, just unscrew the spark plug, screw the compression gauge into its place, fully press the gas trigger and pull the starter handle six or seven times. The arrow on the device will show the working pressure of the cylinder at the moment of compression, which will be an indicator of compression.

Based on my experience, I can say that the minimum compression value in a chainsaw is 4 atmospheres. If the indicator is below this value, then problems with starting the engine are observed and power characteristics are greatly reduced.

Source

Chainsaw Poulan P2250 – features and benefits

This reliable Paulan model is designed for intensive household use. Chainsaws are often also used by professional builders, utility workers, and fellers to clean the trunks of large trees before final cutting.

The Poulan 2250 chainsaw is equipped with a 2-stroke single-cylinder gasoline engine. The power of the internal combustion engine at maximum loads is 1.3 kW. The volume of the working standard cylinder is 38 cm3. The walls of the element are coated with a chrome alloy, which protects the cylinder from corrosion and mechanical damage.

The internal combustion engine of this Poulan chainsaw is distinguished by a solid reserve of torque. At maximum engine loads, this technical characteristic of the model is 12,000 rpm. This makes it possible to use the tool for occasional cutting of large trees, as well as longitudinal sawing of logs.

To start the tool, it comes standard with a fail-safe recoil starter. It is equipped with an enlarged drum with an impeller, which cleans the air as it enters the carburetor. The motor is cooled using an innovative forced air supply system.

The factory configuration of the Paulen saw includes large tanks for filling fuel and oil. The tanks have wide necks, which makes refilling faster and more convenient.

The working parts of the model are represented by a proprietary tire and chain. The headset does not require regular maintenance. The chain is lubricated automatically using a pump.

All internal spare parts of the Poulan chainsaw are placed under a durable plastic case. It is made of multi-layer polymers that can withstand shock when dropped from a small height. If necessary, elements of the protective case can be removed, which greatly simplifies the repair of the instrument.

Model specifications include:

• The power of the standard internal combustion engine is 1.8 liters. With.;
• maximum speed when the engine is idling – 3000 rpm;
• the length of the standard tire used is 40 cm;
• the pitch of the chain provided in the package is 3/8 “;
• working weight – 4.9 kg.

The standard delivery package of this Poulan chainsaw includes a key, a detailed instruction manual, as well as a branded bar and chain.

Related Posts

Compression in STIHL MS180 and POULAN 2250 chain saws.

Compression in STIHL MS180 and POULAN 2250 chain saws.

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Today we will measure compression. For this we need. electric drill with reverse function and maximum speed of about 2500-3000 rpm, car compressor, flexible shaft to transmit rotation from the drill to the crankshaft of the chainsaw

and, strictly speaking, experimental samples and Poulan 2250.

It is worth noting that Stihl. This is a completely working saw (for repairs, which they replaced with a starter cord), but a Poulan with a deliberately destroyed piston.

On both chainsaws, the carburetors are removed for measurement accuracy (suction resistance should be as low as possible), the starter covers are removed (to remove the flexible shaft with a “13” head on the nuts that secure the flywheels), the spark plugs and shutdown buttons are unscrewed in the “off” position »

The Shtil 180 chainsaw does not start. We measure the compression in the cylinder.

How to measure compression

in
a chainsaw
.

Compression measurement on 2-stroke engines

calm 180

measuring the compression ratio, how much bar (atmospheres) should be when measuring the working engine.

So. Our "gentleman's kit"