Chinese Chainsaw Carburetor

The chainsaw does not cut well

1. In this situation, the problem is most likely a dull saw chain. It is necessary to replace it with a new one or sharpen it.
2. Check the supply of lubricant to the saw bar, if it is absent, diagnose the lubrication system and eliminate the malfunctions.

The tire is pulled to the side

1. It is necessary to inspect the tire, if an increased wear is found, replace it with a new one.
2. The chain teeth on one side are much higher than the teeth on the other side, it is necessary to sharpen the chain correctly and adjust the cutting depth.

Tire driven sprocket rotates stuck

The problem is that debris gets into the sprocket bearing, it is necessary to wash the tire in gasoline and re-check, if such actions do not help, then the reason is the wear of the bearings and the tire must be replaced.

The chain is spinning at idle

The main reasons why the chain can turn at idle speed is incorrect idle speed adjustment on the carburetor and a broken spring in the tool clutch mechanism. You must first inspect the clutch for faults and eliminate them if any, and then, if necessary, adjust the idle speed on the carburetor.

Brief review of the Chinese chainsaw Husqvarna 5200

Non-original chainsaw "Husqvarna" 5200 is intended for home use: sawing wood, gardening, preparing firewood. The product weighs 5.3 kg. The power of the two-stroke power plant is 3.4 liters. with. The chainsaw is started with a manual starter. Contactless ignition system. Built-in vibration protection. The chain tensioner is located on the side of the machine and the chain lubrication is automatic. The bars are 52 cm long and the chains are 72 links, which makes it possible to cut fairly large logs. The chain brake will instantly stop a running chainsaw. Hand guard and case not included.

Huskvarna 5200 - China

Peculiarities

• low price;
• automatic supply of grease;
• vibration protection;
• chain brake;
• power 3.4 liters. with.;
• long tire;
• side chain tensioner.

First start-up and further maintenance

Chainsaw Champion 240 arrives in shops already assembled, with the exception of the saw part, you must install it yourself. By adhering to the assembly instructions, you can complete this task yourself.

When starting the engine for the first time, the fuel tank must be filled with a ratio of 1:25 oil to gasoline. For further use, the saw must be filled with a mixture of 1:50.

When used in the future, it is necessary to periodically check the chain tension. Typically, this action is performed at every refueling and before starting work. Automatic fueling and chain emergency stop systems also require regular checks for proper operation. It is forbidden to use the saw if any of the systems fails.

The toothed bumper is sold with the Champion chainsaw and needs to be installed by yourself. The stop improves grip on the tree trunk when cutting.

To do this, unscrew the fastening nuts and remove the protective cover, then put on saw chain the bar so that the cutting edges are in the direction of the chain travel. Install the bar, slide the chain onto the drive sprocket and install the metal sprocket. Finally, adjust the chain tension.

Carburetor Champion 240

Running in a new saw Druzhba

For refueling, a special oil for two-stroke engines and AI-92, AI-95 gasoline are used. Prepare the fuel mixture at the ratio of oil / gasoline 1: 15.The chainsaw should be run in, in accordance with the instruction manual for the Druzhba saw, in two stages. At the first stage of running idling should be at least four fuel tanks have been used up. After that, you can start working without overloading the tool.

In the second stage, the saw should work 25 hours in a gentle mode. Only then can you remove the retaining ring and start full operation.

Chain tension and lubrication

Saw performance and service life are highly dependent on proper chain tension and lubrication.

1. Slide the chain onto the bar.
2. Place the tire on the gearbox.
3. Tighten the mounting bolts, then loosen them.
4. In this position, the chain should slack by 7-10mm.
5. Tighten the mounting bolts.

Chainsaw Friendship 4 has automatic lubrication system chains. Fill the reservoir with oil, at idle, check the evenness of the oil spraying.

It is also important to be able to replace the asterisk. This process consists of the following stages:

1. Dismantling the chainsaw headset, unscrewing the tire cover nuts. Removing the bar and chain.
2. Removing the air filter.
3. Unscrewing the spark plug with the universal wrench, replacing it with the piston stopper.
4. The clutch is removed using a clutch puller that fits into a universal wrench.
5. Replacing the sprocket.
6. Collect in reverse order.

Carburetor adjustment

Often the Friendship chainsaw starts and stalls, does not start at all, or consumes too much gasoline. Improperly adjusted carburetor is one of the reasons for increased fuel consumption and uneven engine performance. Its adjustment does not require special skills and can be done at home.

Before proceeding with the disassembly of the carburetor, make sure that the spark plugs are not filled with a fuel mixture - this quite often happens in units of this type.

Then you should pay attention to the gas valve and bend it slightly inward. This operation reduces the amount of fuel supplied.

If the engine still runs unevenly, proceed to carburetor adjustment:

1. Tighten the fuel screw as far as it will go.
2. Unscrew it back three full turns.
3. Screw in the propeller all the way.
4. Unscrew the propeller two turns.
5. Check the seals for leaks.

Maintenance

Daily maintenance is carried out before and after work: the operability of the Druzhba chainsaw is checked, and it is cleaned of contamination. Routine inspections are carried out in case of malfunctions, minor malfunctions, in order to adjust the chainsaw carburetor, chain sharpening, etc.

The main nodes of the chainsaw Friendship

After the end of active work, it is necessary to mothball the unit. Clean it from dirt, dry it, lubricate working parts so that corrosion does not form, cover and put in a dry place.

De-preservation of the chainsaw Friendship

Thoroughly clean the outer surfaces of the housing from factory grease

Pay special attention to the starter.
Unscrew the spark plug, rinse it in gasoline, wipe with a clean cloth, dry and reinsert.
Wipe the ignition wire with a clean cloth.

Operation, maintenance and repair

To ensure smooth operation of the saw, it must be adjusted periodically. The instruction manual attached to the technique describes the features of setting up the model. Incorrect tuning will lead to imbalance in the operation of the units.

How to adjust the carburetor

Failures occur when not enough or too much fuel is supplied, as well as if the proportions are violated when mixing fuel with air.

Carburetor adjustment is carried out as follows:

1. The fuel regulating screw is first turned all the way, and then back (counterclockwise) by 1.5-2 turns.
2. Start the engine, warm it up for 1-2 minutes and turn the screw T in one direction or another to achieve its stable operation at maximum speed.The idle chain must not travel on the tire.
3. Check and, if necessary, seal the connection of the carburetor to the cylinder.

It is easier to adjust the carburetor using a tachometer, but at home, the engine is usually tuned by ear in most cases. When both quantitative and qualitative fuel supply is normal, the engine does not overheat, does not choke, it runs smoothly, without harsh sounds. When adjusting, the screws turn slowly, without jerking.

How to set the ignition

Correctly adjusted ignition ensures stable engine operation - the Druzhba 4 chainsaw in this case will consume a minimum amount of fuel. The saw is ignited thanks to the magneto using a spark plug and a special wire.

To track the quality of the spark for the ignition of a chainsaw, a candle is placed on the cylinder body and the starter is pulled. If the candle is in working order, a spark will jump between the electrodes. A weak spark will not ignite the fuel; such a spark plug must be replaced.

It is better to replace the contact ignition of a chainsaw with an electronic one. This will save you from constant problems with its regulation. Make sure that the screws securing the ignition coil do not loosen.

Major malfunctions and their elimination

If you know why the tool malfunctions, you can repair it yourself at home.

When the engine of the Druzhba 4 chainsaw starts up and stalls, the reasons may be as follows:

1. There is not enough fuel in the gas tank. It is necessary to add the mixture according to the instructions attached to the tool.
2. The spark plug has been splashed with fuel. This prevents a spark from forming. The candle must be removed, dried, ignited on a gas burner.
3. Poor contact between spark plugs and wire. This is due to the increased gap (more than 0.5 mm) between the spark plug tip and the wire. Candles must be cleaned of carbon deposits with a wire brush, blowing air. They need to be changed periodically.

If the engine malfunctions at idle, the repair of the Druzhba 4 chainsaw is as follows:

• replacing the fuel mixture with a decrease in the amount of oil;
• cleaning the air filter and muffler (due to its clogging, the engine runs, but does not develop speed);
• checking the fuel line and replacing the tube if necessary.

If the cutting speed has decreased, the tire "drives", pay attention to the sharpness of the saw teeth. A well-sharpened chain is more important than a strong engine

It is best to hand it over to the master for sharpening or use a machine with a rotary sharpening disc. The Bevel of the Friendship saw blade on the lower edge is 45 °, and on the side edge - 60 °. The height of the stop lugs relative to the teeth of the chain should be the same and checked after 3-4 sharpening of the chain.

The reasons why the Friendship saw will not start may be as follows:

1. The fuel mixture does not correspond to the repair and operating instructions for the model.
2. Manufacturing defects. Repairs are carried out in a warranty workshop.

When assembling, even if the parts sit with a stretch, you cannot use force, for example, knock on them with a hammer. By replacing worn out elements, you can restore the performance of the chainsaw or extend its service life.

Chainsaws Comfort

In recent years, the previously unknown Comfort brand has been gaining popularity in the post-Soviet space. The network has repeatedly reported that the company is of American origin, however, this information has not been confirmed. The information about the Chinese registration of the brand looks more believable, which is confirmed by the marking on some parts of the Comfort chainsaws.

Like all young companies, the manufacturer tries to create a good reputation for himself, and therefore carefully monitors the quality of the products. In their reviews, the owners of Comfort chain saws talk about their high performance and reliability.Chainsaws of this company are successfully used in the construction and repair of houses, sheds, garages, and other residential and utility buildings. Also, Comfort chain saws can be used for landscaping, garden pruning, harvesting and sawing firewood.

Features of chainsaws Comfort

• Good balance of the body is combined with modern design;
• Reliable, unpretentious engine;
• Easy to maintain and operate;
• Vibration and rebound protection;
• Low price, with high reliability of the unit;
• Ergonomic handles and convenient positioning of control tools.

Main characteristics

Despite the popularity of electric chain saws, "Druzhba" is in good demand. This tool is characterized by excellent design and affordability. Its basis is the power of a two-stroke single-cylinder engine. The saw has an air cooling system, increased service life, good endurance. The engine is lubricated with oil diluted with gasoline.

Adjusting the carburetor of your electric saw is fairly straightforward. The air that enters the element is cleaned with a foam air filter. The motor starts up efficiently, for this there is a starter in the design, which is characterized by reliability and durability. The saw fittings and the motor are connected by flange connections, they are fixed with clamps.

The unusual arrangement of the operator makes it possible to rotate the device at different angles. The carburetor has two chambers, as well as a spark plug and electronic ignition. The chainsaw has a standard silencer, it is necessary to reduce the noise level during operation. Saws "Friendship" are characterized by good technical characteristics, the power indicator is the last figure indicated in the model name.

The above tool is capable of making everyday homework faster and easier. Chainsaws are pretty practical and pay off quickly. Thanks to the thoughtful development of the functionality, the saw is safe to use, therefore it is not capable of causing burns. The purchase of this product will facilitate the performance of tasks in summer cottages, with Druzhba it is easy to saw, prepare firewood, and also deal with branches and twigs.

Modifications

For the entire time of the production of the chainsaw, Friendship 4 has not undergone any serious design changes. Let's see what minor changes took place in the design of the chainsaw:

1. 1950 - 1960 The first constructive modification concerned a change in the variant of fastening the handles, they began to be attached to the fan cover, and subsequently the fastening was transferred to the clamp that connected the engine and the gearbox.
2. 1960 - 1980 At this time, a modification of the chainsaw called Druzhba - 4A, which had two main advantages: a contact magneto and the well-known KMP-100 carburetor, entered the conveyor and was produced for 20 years. At the end of the 80s, the modification of the Druzhba -4A chainsaw was discontinued.
3. End of the 1980s. Release of the Druzhba-4M Electron modification. Electronic ignition is used for the first time.
4. 1990s. Equipping the chainsaw with a modern (at that time) KMP-100U carburetor. Changes to the saw headset - use of modern type chains.

Many people confuse and say that a number of other changes were made on the Druzhba 4 chainsaw, such as a removable starter, a split crankcase and a removable cylinder, but they are deeply mistaken. All these changes were made on the Ural chainsaw, which was based on Friendship.

What other carburetors were put on the Ural 2t Electron chainsaw

The Ural 2t Electron chainsaw was often installed, and are being installed today, carburetors from other two-stroke engines with the following engine parameters:

• power 5.5 HP
• combustion chamber volume 90.4 cc,
• piston diameter 55 mm.

Sometimes carburettors were installed from much more powerful engines. For example, from motorcycles "Minsk", "Voskhod".True, there is a drawback, the supply of the fuel-air mixture significantly increases. It was lowered by adjusting the screws. The engine was running, but the overconsumption of fuel was significant.

Walbro carburetor for Ural chainsaw

On the Ural 2t Electron chainsaw, the German carburetor from the Stihl MS 660 chainsaw, which is close in power, has proven itself well. Its fuel mixture supply almost completely corresponds to the Ural 2t Electron engine. Perfect fit is achieved by adjusting the screws. Also, the seating dimensions are almost identical (between the holes on the carburetor and the studs on the engine). The difference of 1 mm is eliminated by undermining both holes with a file, each by 0.5 mm.

This is how the Walbro carburetor looks like, which is put on the Ural chainsaw

How to put a Chinese carburetor on a Ural chainsaw

The native ZiD plant in Perm no longer produces Ural 2t Electron chainsaws and spare parts for them. On sale there are Chinese-made KMP-100U carburetors worth about 1,500 rubles. They are not always of good quality. And users prefer to install not them, but carburetors from Chinese mopeds.

These are quality products that have the following advantages:

• designed for a long service life;
• economical;
• provide easy starting of the engine.

Progress does not stand still, therefore modern carburetors are much superior to the old KMP-100 in all respects. Carburettors are used from the following mopeds (scooters):

• Alpha;
• Delta;
• Assets;
• Harley.

The carburetors of these mopeds are almost the same, and the engine characteristics are similar to the engine of the Ural 2T Electron chainsaw.

In this video you can see how the Ural 2t Electron chainsaw really works with a carburetor from a Chinese moped:

The last modification of the Ural chainsaw - 2t Electron with the KMP-100U carburetor began to be produced more than 30 years ago. She is gradually disappearing into history. But it seems that it will not leave soon, due to its high maintainability.

Homemade chainsaw Friendship

Another reason for the great popularity of the Friendship chainsaw is the wide range of possible DIY homemade products from this tool. In Soviet times, it was used wherever possible. Let's take a look at the most common homemade device models with impressive refinement.

Snowmobile

The popularity of the Friendship chainsaw in the development of a snowmobile is due to the simplicity of the design and disassembly of the device.

The general drawing of the snowmobile is shown in the following photo:

The main thing in the manufacture of a snowmobile is the creation of a drawing in which the transmission, engine and skis should be connected.

The rack manufacturing scheme is shown in this photo:

And here is the drawing of the tracks:

The drive shaft can be manufactured as follows:

As a steering element, you can take the steering wheel from an ordinary scooter or bicycle, but the braking system is not provided here in any way, you just need to reset the throttle stick, because you will not develop high speeds on it.

How to adjust the carburetor on a Ural chainsaw

Adjustment of the KMP-100U is simple and accessible to every user. The carburetor has two adjusting screws (analogs of the H and L screws on some modern imported chainsaws) for setting the average and maximum speed. They are accessible from the outside; no need to disassemble the case for adjustment.

Above you can see 2 screws with springs, these are the adjusting screws

The Ural chainsaw carburetor is adjusted on a warm engine. Initial tuning should be carried out on a warm, but muffled engine.

1. Both screws are screwed in all the way, but without excessive force. The screws have sharp, fine points that can deform if overtightened.
2. Then the first screw, which is closer to the cylinder, is unscrewed by 1 turn. The second screw is unscrewed by 0.5 turns.
3. Start the chainsaw, give full speed. In case of a drop in revolutions, the screws can be unscrewed by another 1/3 or 1/4 turn, listening to the operation of the engine and finding the optimal mode.

It is impossible to know the exact number of revolutions. On each chainsaw, this is individual, depending on the characteristics of the carburetor, the state of the piston system, the quality of the fuel, the temperature outside, etc.

To adjust, it is enough to remove the cover, there is no need to remove the carburetor itself from the chainsaw

Idle speed adjustment

The idle speed of the carburetor on the Ural chainsaw is regulated by a screw located on the throttle handle. Its rotation changes the position of the throttle valve (opens it slightly) and, as a result, the idling parameters change.

This video shows the maintenance of the KMP-100U, and at the end - a simple and understandable adjustment algorithm.

Specifications

For 60 years of production, the design of the Druzhba chainsaw and its characteristics have changed insignificantly.

The general parameters are as follows:

• fully loaded weight - 12.5 kg;
• dimensions - 865x460x500 mm;
• saw bar length - 450 mm;
• fuel tank capacity is designed for 1.5 liters of fuel fluid;
• spark plug - any with a diameter of 17 mm.

The main difference between the modifications is in power. It is indicated by the number in horsepower at the end of the model name.

Friendship 2

The technical characteristics of this model are as follows:

• engine power - 2.2 kW;
• saw start type - manual;
• no slewing gear.

Druzhba 2 differs from the first model in the presence of a chain braking device, which made it safer: the tool cannot accidentally injure the worker or those around him. The material from which the case is made is reliable and can withstand any temperature extremes.

Friendship 4

This model received a gold medal at the World Technical Fair in Brussels in 1958.

The technical characteristics of the chainsaw are as follows:

• power - 2.94 kW;
• engine oil tank volume - 150 ml;
• total shaft rotation speed - 5000-5400 rpm;

The petrol saw can cut a trunk up to 50 cm in diameter in 1 minute.

Friendship 4M electron

Chainsaw Friendship 4M electron differs in that this model is equipped with an electronic contactless ignition system, which significantly increases the reliability of the engine.

The technical characteristics of 4M are as follows:

• power - 3 kW;
• fuel consumption - 720 g / kWh;
• the distance between the electrodes of the spark plug is within 0.6-0.7 mm.

The inner walls of the aluminum cylinder liner are chrome plated for increased wear resistance. The model is equipped with rubber shock absorbers, which reduce the transmission of engine vibration to the handlebars. In the Druzhba-4M model, the KMP-100U carburetor was used, and with the Druzhba 4A modification, the use of forced lubrication of the chain began thanks to the installation of an oil pump. This greatly increased the service life of the chain and guide bar.

Specifications

The chainsaw is morally outdated today, after all, half a century has passed, so it is worth treating its characteristics with understanding.

On a note. Friendship 4, although a rarity, however, to this day, a large number of copies are in working order and are in demand among the population of the country and neighboring countries! This is due to the fact that very reliable chainsaws were produced in the 60s.

Let's go back to the technical characteristics of the Druzhba 4 chainsaw:

• weight: 12 kg (it is distributed as evenly as possible throughout the body, for comfortable work of the operator);
• tire: length 45 cm;
• chain pitch: 0.325 inches;
• fuel type: gasoline AI-92 + oil for 2T engines.
• fuel tank capacity: 550 ml.;
• oil tank capacity: 260 ml .;
• chain lubrication: only the Druzhba 4A chainsaw had automatic chain lubrication;

Engine characteristics:

• make and model: MP-1 (single-cylinder, carburetor, two-stroke, air-cooled);
• working volume: 94 cubic meters cm.;
• power: 4 HP (2.94 kW.);
• maximum crankshaft speed: 5200 rpm;
• lubrication system: gasoline with oil;
• saw connection system: flange connection fixed with a clamp.

The flange connection made it possible to replace a failed unit without any problems, and also provided the ability to rotate the saw head at an arbitrary angle.

Appointment

In the USSR, 2 models of chainsaws were mass-produced - these are Ural and Druzhba, there was also a Parma electric saw. The Druzhba model was planned for small farms, was a "national" product, and the Ural model was positioned as a professional-level tool for industrial logging.

Although in general these two saws are very similar, the Ural, as a more professional tool, has the ability to rotate the blade to a horizontal position in order to cut a tree trunk while standing and not load the operator's back so much.

The use of the Urals in everyday life or at work greatly facilitates the already physically hard work of loggers. This chainsaw can not only cut trees, but also use it as an assistant in construction and household work, dismantling, crosscutting, sawing firewood.

Chainsaw carburetor adjustment Partner 371

The quality of the main mechanisms of the Partner 371 chainsaw is not satisfactory - all parts and assemblies are made of reliable materials and are highly durable. Nevertheless, the owners of the model are often faced with the need to adjust the carburetor on the Partner 371 chainsaw. To do this, you need to use three screws marked H, L and T.

The setup procedure is as follows:

1. In order to find the highest idle speed of the engine, begin to turn the screw L gently clockwise or in the opposite direction. When the saw motor reaches maximum speed, unscrew this screw ¼ turn counterclockwise. If after that the chain continues to move along the bar, then turn the screw T counterclockwise until it stops completely;
2. Then press the gas trigger on the Partner 371 chainsaw and hold it for 10 seconds. Then turn screw H ¼ turn counterclockwise. Let the engine run in this mode, then check the maximum rpm using a tachometer. If the engine speed does not coincide with the passport indicators, then perform all the above procedures again;
3. To accurately calibrate the carburetor of the Partner 371 chainsaw at idle with the engine running, turn the screw T until the chain starts to rotate. Then immediately turn screw T until the saw chain comes to a complete stop.