How to check the nozzle valve of a chainsaw carburetor

Chainsaw carburetor repair. Chainsaw carburetor. the device, adjustment and washing with their own hands

The carburetor. it is an essential element of a chainsaw, the function of which is to mix the fuel mixture with air and further supply the finished fuel to the engine of the tool. Despite the high reliability of modern carburetors, they are often subject to various breakdowns, which leads to a complete stoppage of the chainsaw engine. Let’s consider the design of this important unit and ways to troubleshoot it independently.

How to rebuild a chainsaw carburetor. simple and straightforward

As with other chainsaw assemblies, before you repair the carburetor, you should study its construction in detail. This will help determine the true failure and fix it quickly. The design of the chainsaw carburetor consists of such elements:

  • The pipe. it is equipped with a transverse flap, regulating the air inflow into the system;
  • Diffuser. located near the fuel inlet. When the diffuser narrows, the rate of air flow into the system increases;
  • Fuel needle. serves to distribute fuel;
  • Float chamber. regulates the fuel level at the point of entry into the channel.

For a better understanding of the construction of the node will need a diagram of the chainsaw carburetor. It clearly demonstrates the location and method of connection of the main elements of the node.

The principle of operation of the chainsaw carburetor is quite simple. The needle sprays fuel into the float chamber, and then the fuel mixes with the air. Then the ready mixture enters the cylinder of the engine. The more fuel is fed to the engine, the higher the amount of motor turnover.

Regardless of the manufacturer and model of the chainsaw, each of the modern tools is equipped with carburetors, which have an almost identical design and work on the same, and the same principle. The main differences lie in the materials of the parts and their location in the carburetor.

Chainsaw carburetor adjustment. when the procedure is required?

  • The engine does not start or stops right after it is started. the reason for this may be a shortage of fuel paired with an overabundance of air;
  • Increased fuel consumption. in this case, the amount of exhaust gases increases rapidly. The cause in this situation should be sought in the increase in the amount of fuel and decrease in the amount of air;

There are also a number of mechanical reasons that lead to the need to adjust the carburetor. These include:

  • Strong vibration. it leads to damage to the protective cap, which will result in the loss of fixation of all three adjustment screws;
  • Wear of the piston part of the motor. in such a situation, the adjustment of the carburetor will only temporarily extend the work of the tool. For a complete elimination of the malfunction it will be necessary to completely replace the piston group;
  • Formation of clogs. they appear as a result of using low-quality gasoline, damage to the filter or scale. In such cases, it will be necessary to dismantle, disassemble and clean the carburetor.

In any of the above cases, it is better not to delay the procedure of adjusting or flushing the unit. Otherwise it will lead to the failure of other, no less important elements of the chainsaw.

How to properly adjust the carburetor on a chainsaw?

Before adjusting the carburetor on the chainsaw, you will need to learn the value of the three screws required for adjustment. These screws have certain markings and names:

  • The screw “L” is necessary for adjustment of low revolutions;
  • The “H” screw is needed when adjusting the engine for high RPM;
  • The “T” screw is needed to adjust the idle speed.

It is worth noting that some chainsaws are equipped with only one “T” screw, so the adjustment of carburetors of such models is performed by manipulating only with this screw.

No matter how many screws you have on your chainsaw, the factory carburetor settings are best for your chainsaw. The screws themselves are initially used in order to adjust the chainsaw for work in certain weather conditions.

Chainsaw carburetors with three screws should be adjusted with the “L” and “H” screws. They must be turned clockwise to increase the RPM. In order to decrease the RPM the screws are turned against it. To adjust the carburetor you will need a special screwdriver for adjustment. it will not slip off the screws and damage the threads on their “caps”.

The process of adjusting the carburetor consists of two stages: the initial and the main. The adjustment procedure is as follows:

  • During the first step, the screws “L” and “H” must be turned clockwise all the way in;
  • After that these screws should be turned for 1.5 turns in the opposite direction;
  • At the second stage, it is necessary to start the chainsaw and leave it for 10 minutes for complete warm-up;
  • Then start to turn the screw “T” until the chainsaw motor begins to run steadily and the chain on the bar does not rotate.

How to check the carburetor of a chainsaw?

After the adjustment you need to check the acceleration, the maximum rpm and the engine idling. In the process of checking the first parameter, you should sharply press the gas trigger. If the motor does not start to gain revolutions, then you need to turn the screw “L” counterclockwise. A single turn should not exceed 1/8 of a full turn of the propeller.

To measure the maximum RPM you need to use the “H” screw. In order to increase the maximum RPM the screw is turned clockwise. To decrease the RPM, turn the screw in the opposite direction. In doing so, remember that the maximum RPM should not exceed 15,000 rpm.

For a final check when the chainsaw is idling you should start it up and put it on a flat surface. Allow the motor to warm up and pay attention to the following elements of the chainsaw:

  • The chain should not move;
  • Motor. when you pull the trigger, it should confidently gain speed until it reaches the set maximum limit.

Repairing a Makita chain saw carburetor. Adjusting the carburetor of a Makita chainsaw

Adjusting the carburetor of a Makita chainsaw affects the performance of the device, the quality of work. For the correct adjustment of the working unit of the equipment, it is important to: understand the principle of its operation, have the necessary tools, treat with care the fasteners, as well as closely located elements responsible for the functioning of the chainsaw.

Features of Makita carburetor adjustment

A Makita chainsaw carburetor works on the same principle as carburetors made by other manufacturers. This important part is responsible for mixing fuel with air. In order to avoid problems with the operation of the device, the Makita chainsaw is adjusted. This will help protect the engine of the equipment.

  • eliminate the risk of the carburetor creating a “lean” mixture;
  • minimize the risk of creating an oversaturated mixture, which negatively affects the performance of the engine, provoking rapid wear.

If you need a new carburetor on a Makita chainsaw ( you will adjust it, guided by the standard manual), choose one that is identical in structure to the original.

  • The basis of the basics is the air passage tube, which is connected to the choke (in the middle). The location of this part affects the amount of air that enters the engine when running.
  • Diffuser. It is not difficult to identify it, if you look carefully at the carburetor components. This part looks like a narrow tube whose main function is to adjust airflow rate.
  • Fuel line from float chamber (connected to nozzle).
  • A separate design that stands out from the others is the float chamber, which looks like a standard tank for fuel fluids.

adjustment screws

Adjustment of the carburetor of a Makita chainsaw is carried out with a set of adjusting screws, which are in the body of this design:

  • The screw marked L. corrects the low revolutions;
  • The screw marked H, it is used to adjust the high revolutions;
  • T screw for adjusting carburetor idle speed.
  • The engine is left to warm up (run the chainsaw for 10 minutes).
  • Checking the air filter and cleaning this part.
  • Stop the chain by turning the screw marked T (turn clockwise as far as it will go).

Use a tachometer to diagnose carburetor problems.

Important! Masters advise to listen to the sound that the screws make when turning. A “squealing” sound may indicate oversaturation of the mixture.

Algorithm for tuning

Carry out the adjustment of the chainsaw carburetor in two steps:

Important ! Some tuning steps need to be adjusted, depending on the Makita chainsaw model. To do this correctly, see the instruction manual.

  • Turn the high and low adjustment screws all the way in (turn clockwise).
  • At the moment of encountering resistance, make a turn and a half back.
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Screw marked T, move in clockwise direction. Release it only when the engine is stable. Keep in mind that the chain should not move at this stage.

What to do if the engine shuts off when idling during tuning? In that case it is important to turn the screw quickly until it stops (turn it clockwise). If the manipulation causes the chain to move, turn the adjusting screw slowly back to the previous position.

How to check if the carburettor is set correctly?

To do this you need to speed up the chainsaw. Run the engine at maximum rpm to be able to judge its performance objectively. When you hit the gas pedal, the engine should rev up to about 15,000 rpm. This indicator indicates that the carburetor adjustment was successful.

If you can not achieve this indicator at high revolutions and acceleration is slow, you need to re-adjust the carburetor, working only with the screw, which has the marking L. Turn it counterclockwise. Turn the screw slowly so that the turn does not exceed 1/8 of a full turn.

If the problem is the opposite and you need to reduce the maximum rotation to 15 thousand, you need to turn the screw marked H. Rotate it gradually, slowly in the opposite direction to the clockwise direction.

by reducing the RPM to its optimum value, the risk of engine wear is reduced.

STIHL STIHL 180 chain saw carburetor repair with your own hands

From the main chamber, through special channels and through the nozzle valve, into the cylinder. By adjusting the throttle valve position, the operator increases the amount of fuel going into the cylinder.

Closing the choke means more fuel is getting into the cylinder and that will have a positive effect on starting a cold chain saw. Adjusting screws of quality and quantity, work on the principle of gate valves, reducing the flow capacity of the channels through which the fuel enters the cylinder.

The nozzle valve has a fixed flow rate and conveys fuel in one direction only. The following video shows a detailed adjustment of the carburetor of a STIHL chainsaw with an electronic tachometer.

How to adjust the carburetor on a Partner 350 chain saw

STIHL chain saw carburetor repair The main problems with STIHL chain saw carburetors include. A common problem that causes STIHL to be unstable is the loss of the retaining ring on the throttle linkage, which causes it to wobble and play, resulting in erratic operation. How to disassemble a STIHL chain saw carburetor. then everything is simple.

It is enough to change all the necessary components in the repair kit. After disassembly, the carburetor should be washed in gasoline, and the channels and jets blown with compressed air.

In no way can you blow out the carburetor under high pressure and in assembled condition. You might otherwise cause a rupture in the diaphragm or the diaphragm. The carburetor will no longer work properly. In order to evaluate the condition of the strainer and diaphragm, the following sequence of actions should be performed. We check a condition of a grid-filter on presence of dirt, if available we clean it. We put everything back and dismantle the carburetor from the other side. After unscrewing 4 screws remove the lid, remove the diaphragm and assess the condition of the insides.

You need to unscrew 4 screws in total To check the correctness of the fuel supply, putting the hose on the nozzle. Blow into it with your mouth and open the needle valve with your fingers. Blow 2 holes in the nozzles, the same hose, they should quietly blow, without excessive force.

If necessary, it is enough to clean it with usual WD cleaner. We remove the nozzle-jet nozzle located on the right side and clean it with a thin wire from the opposite side. Clean and assemble everything. The adjusting screw on the carburetor only one. idle RPM happens, twist it, and the chainsaw again earned. Replacement of the aluminum plug of the bypass channels of the carburetor Walbro China.

The fuel nozzle is built into the carburettor body in such a manner that it serves as a connecting link.- carburetor should be adjusted with the other components of the system unchanged. If you repair the nozzle valve in the carburetor chainsaw repair carburetor chainsaw nozzle valve nozzle for fuel is built into the carburetor so that is the connecting link between the distribution chamber and the cavity, which is installed throttle.

Carburetor Honda Dio 35 that where To do this, remove it from the valve and move the retaining ring on the grooves. Learn quality Lifan motorcycle carburetor Price is for a motorcycle in its original packaging in a partially disassembled state.

Assembly service and Parts of the carburetor moped alfa Judging by the ignition system you have everything in order and the fuel comes, Adjusting the carburetor chain saw Poulan with their own hands Many useful articles on the repair of chainsaws can be found on our website in the section Maintenance No excessive mechanical or chemical stresses it does not carry.

So a simple change may be a good way to extend the life of a chainsaw for a long time, even if it costs a pretty penny. What carburetor is used on the STIHL chain saw The STIHL chain saw is equipped with a Japanese Zama membrane-type carburetor. How does STIHL carburetor work. design, principle of work The basic components of STIHL chain saw carburetor include: fuel pump with internal diaphragm; main diaphragm chamber; diffuser; throttle and air valves; needle valve; fuel injectors; nozzle with valve; idle speed adjustment screw.

STIHL chain saw carburetor adjustment Normally, for the amount and quality of fuel entering the diffuser are responsible for special screws, by adjusting which we change the cross-section of the fuel channel. The adjustment procedure is as follows: Check the air filter. If necessary, replace the filter element. Screw the LD screw all the way in counterclockwise and then unscrew it 2 turns. Warning, left-hand thread!

There is a screwdriver hole on the body of the saw for accessing the screw. Start the engine and warm it up for minutes. Turn the LD screw slowly clockwise and adjust the idle speed at random. There are 2 possible situations: The engine idle speed is very low.

Engine won’t hold idle. The saw spins at idle. STIHL chain saw carburetor repair The main problems with STIHL chain saw carburetors are. No petrol in the carburettor. The banal reason is the fuel pump failure.

The STIHL chainsaw, aka STIHL MS, is the German brand’s most popular and recognizable model. This chainsaw is simple and reliable to operate. The only part that needs a lot of attention is the carburettor. This article will discuss carburetor adjustment, repair and maintenance.

The diaphragm has lost its elasticity or is leaking. It happens because of material fatigue from prolonged use. As a result, when there is a vacuum in the engine, the diaphragm doesn’t lift up and open the fuel channel with the valve. It can be replaced with a spare one from the repair kit by disassembling the carburetor. It is also possible that fuel is not pumped because of a clogged filter element in the pipe between the fuel pump and the needle valve. This can also be fixed by replacing the kit.

Carburetor overflows. It is not difficult to guess that the problem is in the main chamber. Dirt particles get in the cavity between the needle and the channel, i.e. the valve does not close the channel completely when it is necessary and the chamber is flooded.

Very often the diaphragm stops functioning because of stretching or natural wear and tear. As a result, when lowered, the diaphragm does not lift the needle fully and the fuel continues to flow. The main diaphragm is also a part of the repair kit. It is easy to replace. STIHL chain saw owners often have trouble starting after winter storage. In this case there is a sticking of the valve in the nozzle. Before putting the chain saw into storage, the manufacturer recommends burning off the remaining gasoline in the carburetor.

Gasoline tends to evaporate and if stored for a long time, engine oil remains in the carburetor, in contact with which the nozzle valve begins to stick to the body.

How to adjust the carburetor on a Partner 350 chain saw

STIHL chain saw carburetor repair The main problems with STIHL chain saw carburetors include. A common problem that makes STIHL unstable is the loss of the retaining ring on the throttle linkage, as a result it starts to chatter and play, which in turn leads to a malfunction in the. How to disassemble the carburetor on a STIHL chain saw. here everything is simple.

It is enough to change all the necessary components of the repair kit. After disassembly, the carburetor should be washed in gasoline, and the channels and jets blown with compressed air.

In no case you should not blow out the carburetor under high pressure and in assembled condition. Otherwise you may strain the diaphragm or the diaphragm. The carburetor will stop working properly. In order to assess the condition of the mesh-filter and diaphragm, you need to perform the following sequence of actions:. Check the mesh-filter for dirt and clean it if it is dirty. Put everything back together and disassemble the carburetor from the other side. After unscrewing the 4 screws remove the cover, remove the diaphragm and assess the condition of the insides.

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A total of 4 screws need to be unscrewed To check the correctness of the fuel supply, putting the hose on the nozzle. Blow into it with your mouth and open the needle valve with your fingers. Blow 2 holes in the nozzles, the same hose, they should quietly blow, without excessive force.

If necessary, it is enough to clean the usual cleaner WD Remove the nozzle nozzle, located on the right, and clean the thin wire, from the back. Clean and Reassemble Everything. The adjusting screw on the carburetor only one. idle rpm happens, twist it, and the chainsaw worked again. Replace the aluminum plug of the bypass channels Walbro carburetor china.

The fuel nozzle is built into the carburetor body so that it is the connecting link Take.- the carburetor should be adjusted with the other components of the system unchanged. If you repair the nozzle valve in the carburetor chainsaw repair carburetor chainsaw nozzle valve nozzle for fuel is built into the carburetor so that is the connecting link between the distribution chamber and the cavity, which installed the throttle valve.

check, nozzle, valve, chainsaw, carburetor

Honda Dio 35 carburetor that where To do this, remove it from the slide and move the retaining ring on the grooves. Learn Quality Lifan motorcycle carburetor Price is for a motorcycle in its original packaging in a partially disassembled state.

Assembly service and Parts of the carburetor moped alfa Judging by the ignition system you have everything in order and the fuel comes, Adjusting the carburetor chain saw Poulan with his hands Many useful articles on chain saw repair can be found on our website in the Service No excessive mechanical or chemical stresses he is not.

So a simple change might be a good way to extend the life of a chainsaw for a long time even though it costs a pretty penny. Which carburetor is used on a STIHL chain saw STIHL chain saw has a Japanese Zama membrane-type carburetor. How does the carburetor STIHL device, principle of work To the main components of the carburetor chain saw STIHL include the following components: fuel pump with internal diaphragm; main diaphragm chamber; diffuser; throttle and air valves; needle valve; fuel nozzles, nozzle and valve; speed adjustment screw at idle.

STIHL chain saw carburetor adjustment Normally, special screws are responsible for the quantity and quality of fuel entering the nozzle. The adjustment procedure is as follows: Check air filter. Replace the filter element if necessary. Screw the LD screw all the way in counterclockwise direction and then unscrew 2 turns. Note left-hand thread!

A screwdriver hole is provided on the body of the saw for access to the screw. Start the engine and warm it up for a few minutes. turn the LD screw slowly clockwise to adjust the idle speed. There are 2 possible situations: Idle RPM is very low.

Engine won’t hold at idle speed. Saw spins at idle speed. STIHL chain saw carburetor repair The following are some of the basic carburetor problems with STIHL chain saws. No petrol in the carburettor. The banal reason is the failure of the fuel pump.

The STIHL chainsaw, aka STIHL MS, is the German brand’s most popular and best-recognized model. This chainsaw is simple and reliable. The only assembly that requires close attention is the carburetor. This article takes a look at carburetor adjustment, repair and maintenance.

Diaphragm no longer elastic or burst. This is caused by material fatigue from prolonged use. As a result, when there is vacuum in the engine, the diaphragm does not lift and open the fuel channel with the valve. You can replace the diaphragm with a spare one from the repair kit by disassembling the carburettor. You can also have a blocked filter element in the pipe between the fuel pump and the needle valve. Can also be replaced with a repair kit.

Carburetor overflows. It’s not hard to guess that the problem is in the main chamber. Dirt particles get in the cavity between the needle and the channel, that is, the valve does not fully close the channel when needed and the chamber is flooded.

Very often the diaphragm stops working as a result of stretching from normal wear and tear. As a result, when you lower the diaphragm, the needle doesn’t lift all the way up and fuel keeps coming in. The main diaphragm is also in the repair kit. It is very easy to replace. STIHL chain saw owners often find it hard to start after winter storage. If this happens, the valve in the nozzle is stuck. The manufacturer recommends firing up the remaining gasoline in the carburetor before putting the chain saw into storage.

Gasoline tends to evaporate and if it is stored for a long time, engine oil remains in the carburetor and the nozzle valve starts to stick to the body.

STIHL 180 chain saw. Assembly and adjustment of the carburetor

If it is needed it is enough to clean it with usual WD cleaner. We remove nozzle on the right side and clean it with thin wire from the opposite side. Clean and assemble everything. When installing the cap, be sure to install it correctly. See photo below. Advantages and disadvantages Zama carburetors are very reliable and easy to use. How much does a new carburetor cost?

STIHL chain saw carburetor repair with your own hands Regulation of a chainsaw carburetor we recommend to do it in a service center. First: preparation for carburetor adjustment Before adjusting a chainsaw carburetor, make sure the air and fuel filters are clean.

Fifth: adjusting the maximum rpm Screw H in general is no better to adjust without help from others. STIHL saw repair with my hands carburetor. Useful with. STIHL ms band saw carburetor repair How to repair the carburetor on a STIHL ms chain saw Repair STIHL carburetor repair Cleaning STIHL carburetor Maybe someone can help with advice on how to run it properly.

There is an opinion that this procedure is a marketing ploy to lure customers to their service centers, but objectively, such factory settings can reduce the risk of overheating the saw during the running-in period, and if not adjusted later. it increases the service life, but at the expense of fuel economy and performance.

Check that all parts are working properly to ensure chain saw safety: Check the chain brake at full acceleration once a day Check the throttle and starting lever for proper functioning The chain should be tight, but still move freely by hand. Resharpen the chain after replacement and always when necessary. You should also pay attention to checking that the shape of the cutting tooth is not too irregular? Next, clean the air filter or replace it with a new one, and pay special attention to inconspicuous crevice, which should always be clean, otherwise the saw will start with great difficulty, I marked this place with an arrow Well, it is not superfluous to check the gasoline filter, which is in the tank, take it out of there and clean if it got dirty.

Check the air filter and replace it if necessary. Structure and principle of operation Before you start adjusting it is recommended to study the structure of a chainsaw carburetor in advance.

The main parts of the gasoline saw carburetor are: the tube. performs the function of air transmission, batch supply is possible due to the presence of the flap; diffuser. this detail is located directly at the inlet, through which the fuel is fed, is able to accelerate the air flow; atomizer is able to inject gasoline into the created air flow; float chamber is a cavity, serves to maintain fuel at the same level, from it through the nozzle gasoline is fed to the atomizer.

Troubleshooting The carburetor on a STIHL chain saw requires both initial and periodic adjustments. You can tell if it’s needed by the following signs: Engine problems, such as the engine not starting or immediately shutting down after starting. Most often the cause is the use of a poor quality fuel mixture.

Fuel consumption and increased exhaust. Exhaust emissions are higher due to incomplete combustion. This problem is often caused by too much fuel. How to remove the carburettor on a STIHL chain saw. To do this: Turn the safety catch to the left to remove the fuel cap. Remove the filter, for which unscrew the two nuts that hold it. For ease of operation it is recommended to use special screwdrivers with suitable tips. Remove all the rods, including the carburetor lever.

Remove the carburetor, and then disconnect the fuel hose. How to clean In the event that the chainsaw stalls at idle, you need to disassemble the part and clean it.

The STIHL chainsaw, aka STIHL MS, is the German brand’s most popular and best-recognized model. This chainsaw is easy and reliable to operate. The only assembly that requires close attention is the carburetor. This article will discuss the adjustment of the carburetor, its repair and maintenance.

To get to it you need to: Remove the biggest cover. Remove the diaphragm, which is located under the cover.

Clean the screen in the recess of the carburettor. It must be done very carefully, because the mesh can fall out.

Use a copper wire to clean it. Additionally it is necessary to flush and purge all channels. The last procedure is necessary if the carburetor does not receive gasoline. How to change the carburettor on a STIHL chain saw: Adjusting the carburettor helps to improve performance and fuel economy. To adjust with your own hands need: Clean the fuel system, including the tank, from the remains of the mixture of gasoline and oil.

Troubleshooting STIHL 180 chain saw

Bolt H controls the nipple, provides maximum revolutions. L bolt performs the same function, but provides the minimum rpm. Screw S is responsible for the accuracy of the idling speed. Perform this procedure with the engine off. Adjust the carburetor on the chainsaw by setting the appropriate angles of rotation of the first two bolts.

You can set the basic values as follows. Turn the first two bolts slowly in a clockwise direction and go back two revolutions after the stop. Turn the engine on and adjust the ignition on the STIHL chain saw and its carburetor. To do this, find the highest idle speed by turning the screw L in different directions. Once this maximum has been reached, the bolt must be returned to a quarter turn. In case the chain starts to move, the engine must be stopped.

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Carry out a technical check. In particular, you need to determine the maximum number of revolutions, check the acceleration and stability of the engine at idle, as well as the compliance of these parameters with the basic values in the manual. Mixture quality for checking should be top notch. Before you rebuild your STIHL chain saw and change the carburetor it is best to leave this to the professionals.

What you need to have for adjustment

If you intend to adjust the carburetor on your Partner 350 or 350S you must have an electronic crank counter (tachometer).

You will also need a screwdriver. Adjusting screws in the carburetor WT-891 made under the usual slotted, which is available to every chainsaw owner.

Before making any adjustments you need to replace the air and fuel filters on the tool, i.e. к. This is one of the prerequisites for obtaining the best possible results. For this reason it is necessary to have a set of filters in stock.

check, nozzle, valve, chainsaw, carburetor

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The carburetor on a Partner 352 chain saw. About the carburetor structure

The carburetor serves to mix the combustible consistency with the air while respecting the proportions set in advance. If you do not keep exact measurements, your engine’s functionality is endangered. When during mixing the component receives a huge amount of air, and not enough fuel, then such a mixture is considered “lean”.

Do not allow oversaturation, because when a large amount of fuel compared to the air is also likely to malfunction or wear the engine. Adjusting the carburetor is necessary not only before the initial introduction, and when you identify any differences in his work. Before working with a chainsaw, don’t forget to run it in.

The components of the carburetor

A carburetor has a standard set of parts but this may vary slightly depending on the manufacturer. Components:

  • Basics. This is a special tube, which visually resembles an aerodynamic design. The air passes through it. There is a damper in the transverse direction in the middle of the pipe. Its position can be changed. The more it is extended into the aisle, the less air enters the engine.
  • Diffuser. It is the narrowed part of the tube. Adjusting the carburetor on a Partner 350 chain saw. It increases the airflow rate exactly in the segment where the fuel comes out.
  • Channels for fuel supply. Fuel mixture is in the float chamber, then goes to the nozzle, from which it flows to the atomizer.
  • Float chamber. Is a separate structural element, reminiscent of the shape of a tank. Designed to maintain an optimal fuel liquid level at all times before entering the channel from which the air enters.

Looking for cheaper models, but reliable and time-tested? Look for chainsaws made in Russia.

Or study foreign chainsaw makers, such as STIHL.

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Why an initial adjustment??

For the first few hours the 2-stroke chainsaw engine needs a running-in period, on which the quality of its future use depends. During the running-in period the initial adjustment of the carburetor is performed. the optimal parameters of fuel mixture preparation and supply are set.

The initial running-in of a chainsaw: thin material

Most modern chain saws come with settings. But it doesn’t hurt to check the factory settings. after all, you are the one who has to work with the machine.

At the first start-up the chain saw has to work sparingly. So for a few hours after starting it is recommended not to overload the engine and to cut only small branches and trunks up to 10 cm thick.

To insure against malfunctions in the chainsaw carburetor will help simple rules:

    Always mix gasoline and oil according to the manufacturer’s figures.

Fuel mix proportions for the chainsaw engine

The chainsaw should start correctly, have a consistent chainwheel speed and a smooth increase/decrease in power. No unusual knocking, squealing or noise from the engine.

A professional chainsaw at work

The most important thing during the first run-in is to make sure that the fuel consumption corresponds to the power used, i.e.е. In practice the saw should not go out, “sneeze”, smoke and jerk.

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How to flush a chainsaw carburetor?

It is best to use a cleaner that comes in a pressurized can to clean the unit from heavy dirt. The cleaner comes with a dispenser and a long thin tube, which allows you to spray the product in any hard-to-reach places.

It should be remembered that cleaning the carburetor on a chainsaw is performed using flammable chemicals. They should be operated with a special protective mask and only in well-ventilated rooms.

To clean the carburetor on a chainsaw, the assembly will need to be partially disassembled. Throttle, adjusting screws, carburetor body and other carburetor parts will need to be washed with a spray can and leave until completely dry. Once all components are dry, the assembly can be reassembled and put back on the chainsaw.

The nozzle valve in the chainsaw carburetor

This chainsaw carburetor diagram is as simple and effective as possible. In some models of garden tools, it can be supplemented with additional spigots, glands or filters.

  • aluminum housing with one-piece construction. Inside the housing there is an inlet fitting, a main screw, a pulse channel, and a bolt for adjusting the motor when idling;
  • throttle valve. it is responsible for adjusting the amount of air required to enrich the fuel mixture;
  • diffuser. located next to the chamber inlet;
  • atomizer. designed for supplying the fuel mixture directly into the carburetor chamber;
  • Float chamber. in it there is a float, which is triggered in case of insufficient amount of fuel;
  • nozzles. are valves that are responsible for adjusting the amount of fuel.

This chainsaw carburetor circuit is as simple and effective as possible. In some models of garden tools, it can be supplemented with additional spigots, glands or filters. The principle of operation of a chainsaw carburetor is quite simple. At the moment the engine is started, the air damper, located at the bottom of the body, opens. In this case, in the float and air chambers, a vacuum is formed, caused by the movement of the piston. As a result, the regular diffuser is triggered, which begins to suck in air. The amount of air intake depends on how open the choke is. When the piston is actuated, fuel begins to flow into the chamber through the inlet fitting. Its flow rate and quantity depend on the position of the nozzles.

Later on the fuel in the air chamber begins to mix with the air. The ready-to-use fuel-air mixture then flows through the intake valves into the combustion chamber of the saw’s engine.

How to check the fuel filter on a chainsaw

Decrease in the capacity of the main fuel channel, causes undesirable consequences expressed in the reduction of power or complete stopping of the tool at higher rpm. These problems are a clear indication that the fuel filter is dirty. The more pronounced such malfunctions are, the more clogged the channel is.

It is not always possible to tell by visual inspection if it is dirty. The filter may look clean, but the inside is clogged with tiny particles and suspended particles. The cause of the malfunction can be determined experimentally by removing the filter and running the tool without it. If the operation is normal, then a new element must be installed.

If your chain saw is used regularly, every 5 days or so every 3 months, change the fuel filter. If the tool burns ≈5 liters of fuel in 1 day, then in 60 days it would be 300. For domestic saws, this figure can be divided by 2, because they are equipped with less reliable filters. Bottom line, in home/hobby use, replace every 150 liters or once a year.

Disassembling the STIHL 180 carburettor

To blow, change gaskets or needle valve, the carburetor must be disassembled. To do this, unscrew the 4 screws on the compensator cover and one on the fuel pump.

Once the housing is opened, you must be extremely careful because of the hazards involved. к. If debris gets inside the carburetor, it will make it impossible to operate. Thickness of channels in it is comparable to the thickness of a thread or even a human hair.

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I’d like to reiterate that STIHL carburetors made by its subsidiary Zama are very reliable. With proper use and storage can last the whole life of the chainsaw without repair.

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