How to set up a carburetor on a Carver chainsaw
How to set up a carburetor on a chainsaw: recommendations
Chainsaw carburetor. this is one of the main components of this tool. He is responsible for the fuel supply. The efficiency and power of the equipment depends on how correctly this unit functions. Timely adjustments also ensure cost-effectiveness.
Before adjusting the carburetor on a chainsaw, you should know that adjustments to this part of the device are quite rare. As a rule, the factory setting is sufficient for normal operation. However, if more precise adjustment is required, then special screws can be used. Before starting such work, it is necessary to understand the subtleties and nuances of the process.
Basic adjustment step
First you need to use the rotational screws. They are wrapped clockwise all the way. Then turn it back one and a half turns.
Correction of the maximum number of revolutions
Before adjusting the carburetor on the Partner 350 chainsaw, you must find the “H” screw. It is required to adjust the maximum speed. It should be rotated clockwise, while if it is necessary to reduce the number, then the movement of the screw should be directed in the opposite direction.
The maximum frequency should be set between 11500 and 15000 rpm. If this value is exceeded, then the engine will work for wear, which will certainly lead to a violation during ignition. When turning the screw under the letter “H”, you need to take into account how the ignition occurs. If there are malfunctions, then the rotation should be stopped by turning the screw counterclockwise.
You should know how to adjust the carburetor on a Chinese chainsaw. In this case, another check is carried out at idle speed. Once the acceleration adjustment has been completed, it is necessary to bring the tool to idle. If you did everything correctly, the chain will remain stationary, and the motor will pick up speed in a short time when you press the accelerator.
You should also listen to the operation of the engine. The sound should be like a four-stroke unit. If you are thinking about how to properly tune the carburetor on a chainsaw, then you must make sure that the above conditions are met. If this is not the case, then the adjustment must be repeated, and the basic stage is omitted. You should not take to work if you do not have sufficient experience, because in this case, a misalignment of the unit may occur. When self-tuning is not possible, then stable work can be achieved by contacting professionals.
In order to get to the carburetor, the bolts on the tool cover are unscrewed. The case must be opened and the foam rubber, as well as the parts of the air filter must be removed. Only now can you start adjusting. Before setting up the carburetor on a chainsaw, you should find out that the main task of these works is to change the quantity and quality of the air-fuel mixture that is pumped into the engine combustion chamber.
While working, you must follow certain rules, among them:
- the chain must be directed to the side;
- the equipment should be laid on a flat surface;
- the cutting parts must be removed to a safe distance.
The first requirement is due to the need to avoid injury. If you are wondering how to set up a carburetor on a chainsaw, you should know that it is necessary to carry out these works using three screws. The first one controls the jet and is designated by the letter “H”. It is necessary to correct the maximum speed.
The second screw can be found under the letter “L”. This assembly is required to control the idle jet at low shaft speeds. Quite often, novice craftsmen ask themselves how to set up a carburetor on a Partner chainsaw. It denotes the third screw with the letter “T”. It is needed to correct the idle speed. The adjustment process is divided into stages:
The first is carried out with the engine off, while the second is carried out with a warm engine.
When carburetor adjustment is required
If it happens that the adjusting screws are loosened, then the carburetor should be adjusted. Other signs may indicate the need for these manipulations, among them:
- breakage of the protective cap;
- significant piston wear;
- interruptions in the operation of the motor;
- strong vibration;
- no response from the engine when trying to start the tool;
- increased fuel consumption;
- strong exhaust.
Specialist’s recommendations for working with the Druzhba chainsaw carburetor
Before adjusting the carburetor of the Druzhba chainsaw, you must carry out maintenance on the tool. It involves flushing the engine, cleaning the carburetor, replacing the spark plug, checking the chain tension, cleaning the air filter, warming up the engine and adjusting the idle speed. Once the screws “H” and “L” have been tightened all the way, they must be unscrewed one turn. This must be done when the chainsaw is muffled.
Then the tool is warmed up, full throttle is given, and the first of the mentioned screws rotates in such a way as to reach 14,000 revolutions per minute. The maximum speed should be held for 10 seconds or less.
By turning the last screw, ensure that the chain starts to move. Then the bolt is loosened a quarter turn counterclockwise. If after this the idle speed turned out to be not so stable, and the tool accelerates slowly, the screw under the designation “L” must be turned counterclockwise, only then the chainsaw will gain speed.
It is important to remember that the adjustment will not give results if air is sucked into the engine from the side. This can happen through:
- accelerating pump;
- a gasket under the carburetor;
- crankshaft oil seals.
After completing the procedure, the engine of the instrument can be started by warming it up for 10 minutes. In this case, you can set the average speed. Then you can do the idle screw.
Chainsaw Carburetor Adjustment. When Procedure Required?
- The engine does not start at all, or it stalls immediately after it starts up. the reason for this may be a lack of fuel paired with an excess of air;
- Increased fuel consumption. in this case, the amount of exhaust gases increases rapidly. The reason for this situation should be sought in an increase in the amount of fuel and a 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:
- Severe vibration. this will damage the protective cap, resulting in a loss of fixation of all three adjusting screws;
- Wear of the piston part of the engine. in such a situation, adjusting the carburetor will only temporarily prolong the operation of the tool. To completely eliminate the malfunction, you will have to completely replace the piston group;
- Blockages. they appear as a result of the use of low-quality gasoline, filter damage or scale. In such cases, it will be necessary to dismantle, disassemble and clean the carburetor.
In any of these cases, it is best not to overtighten with the adjustment or flushing procedure. Otherwise, this will lead to breakdown of other, no less important elements of the chainsaw.
Chainsaw carburetor. device, adjustment and flushing with your own hands
The carburetor is an integral part of the chainsaw, the function of which is to mix the fuel mixture with air and then 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 entails a complete stop of the chainsaw engine. Let’s look at the design of this important unit and how to troubleshoot it yourself.
How to remove a carburetor from a chainsaw?
Before cleaning the carburetor or repairing it, this element of the chainsaw will need to be dismantled and disconnected from other components. To do this, you must follow a certain order of actions. The dismantling algorithm is as follows:
- First, remove the top cover by unscrewing 3 bolts around its perimeter;
- Remove the filter in the form of a foam pad;
- Disconnect the fuel supply hose;
- Remove the drive rod;
- Disconnect the cable end;
- Carefully remove and fully pull out the fuel hose.
Try to perform each of the actions as carefully as possible. Otherwise, there will be a risk of damage to important parts of the chainsaw.
Chainsaw carburetor device. simple and affordable
As is the case with other chainsaw units, before repairing the carburetor, you should study its design in detail. This will help determine the true breakdown and quickly fix it. The design of the chainsaw carburetor consists of the following elements:
- Tube. equipped with a transverse damper that regulates the ingress of air into the system;
- Diffuser. Located next to the fuel inlet. As the diffuser narrows, the air flow rate into the system increases;
- Fuel needle. serves to distribute fuel;
- Float chamber. adjusts the fuel level at the point of entry into the channel.
For a better understanding of the assembly design, a chainsaw carburetor diagram is required. It clearly demonstrates the location and method of connecting the main elements of the node.
The principle of operation of a chainsaw carburetor is quite simple. The needle sprays fuel into the float chamber, after which the fuel is mixed with air. Then the finished mixture enters the engine cylinder. The more fuel is supplied to the engine, the higher the number of revolutions of the engine.
Regardless of the manufacturer and model of the chainsaw, each of the modern tools is equipped with carburetors that have an almost identical design and work according to the same principle. The main differences lie in the materials of spare parts and their location in the carburetor device.
How to check a chainsaw carburetor?
After adjustment, check acceleration, maximum RPM and engine idling. In the process of checking the first parameter, you should sharply press the gas trigger. If at the same time the motor does not start to pick up speed, then it is necessary to turn the screw “L” counterclockwise. In this case, one turn should not exceed 1/8 of the full circle of the screw.
To measure the maximum speed, you will need to use the screw “H”. To increase the maximum speed, the screw is turned clockwise. To decrease the indicator, the screw must be turned in the opposite direction. It should be remembered that the maximum number of revolutions should not exceed 15 thousand.
For a final check of the chainsaw when idling, you need to start the tool and put it on a flat place. Let the engine warm up and pay attention to the following parts of the chainsaw:
- Chain. must not move;
- Motor. when you press the gas trigger, it should confidently pick up speed until it reaches the set maximum limit.
An important tip. if the carburetor is configured correctly, the sound of the chainsaw motor will strongly resemble the sound when a 4-stroke engine is running.
In a similar manner, the carburetor of a Chinese chainsaw is adjusted and checked. The only difference is that the process of setting up such instruments can take much more time. on average, about an hour. In addition, it should be remembered that the adjustment of Chinese chainsaws is required much more often. it often needs to be done immediately after running in a new tool.
How to properly adjust the carburetor on a chainsaw?
Before adjusting the carburetor on a chainsaw, you will need to study the meaning of the three screws required for adjustment. These screws have specific markings and names:
- Screw “L” is required for low speed adjustment;
- The “H” screw is required when tuning the motor for high speed operation;
- Screw “T” is needed to adjust idle speed.
It is worth noting that some chainsaws are equipped with only one “T” screw, so the carburetors of such models are adjusted by manipulating only this screw.
No matter how many screws there are on the chainsaw, the factory settings of the carburetor are the most optimal for its operation. The screws themselves were originally used to adjust the chainsaw to work in certain weather conditions.
The carburetor adjustment process consists of two stages: initial and main. The algorithm of actions during adjustment is as follows:
- During the first step, screws “L” and “H” must be tightened clockwise to the very end;
- After that, these screws must be turned 1.5 turns in the opposite direction;
- At the second stage, you need to start the chainsaw and leave it for 10 minutes to fully warm up;
- Then start turning the screw “T” until the chainsaw motor starts running stably and the chain on the bar does not rotate.
How to clean a chainsaw carburetor?
Flushing the carburetor of the chainsaw is required in cases where low-quality fuel is used to refuel the tool, or the tool is used at extremely low temperatures. In the process of work, you need to try not to damage or lose the small parts of the unit. Carburetor cleaning is performed in this order:
How to properly adjust the carburetor on a chainsaw?
Place the tool on a firm, level surface to set up the assembly. It is best to adjust the carburetor of the chainsaw in a place protected from dust and moisture.
The node setup process should look like this:
- First you need to unscrew the fastening bolts and remove the protective saw body. This will make it possible to inspect the carburetor and, if necessary, clean it;
- Next, you need to remove the standard air filter of the tool. If the saw is equipped with an additional foam insert, then it must also be removed;
- After that, you need a screwdriver, with which you need to tighten the bolts marked H and L clockwise until they stop. This must be done very carefully so as not to break the bolts;
- Then both screws should be unscrewed 1.5 turns in the opposite direction;
- Next, you need to start the chainsaw engine and let it run for about 7 minutes;
- As soon as the engine cylinder heats up, you will need to start turning bolt L until the internal combustion engine starts working at maximum speed. Immediately thereafter, the bolt must be turned 1/4 turn in the opposite direction;
- Then you need to adjust the operation of the motor at high speeds. To do this, you need to connect an electronic tachometer to the engine, and start turning the bolt H until the readings on the instrument panel coincide with the instructions for the recommended maximum revolutions in the instructions for the saw;
- In the end, it remains to adjust the operation of the internal combustion engine of the saw at idle. To do this, slowly turn the bolt T against the clock hand until the motor runs stably and without dips. If the engine starts to stall, then the T bolt should be turned in the direction of the clock hand.
To adjust the carburetor on a chainsaw, you should work as accurately as possible with the adjusting bolts. Excessive tightening of the screws will lead to increased stress on the engine and other important parts of the garden tool.
The chainsaw carburetor is the element that mixes the air / fuel mixture. Not only the stability of the engine, but also the speed of the entire chainsaw depends on the condition and serviceability of this important unit. In this regard, each owner of a garden tool should study the design of the carburetor, as well as familiarize himself with the rules for its maintenance and repair.
Chainsaw carburetor adjustment. what a beginner needs to know?
Initially, all adjusting bolts are in the factory positions. this ensures that the optimal amount of fuel and air is sucked in. However, due to prolonged use of the saw in difficult conditions, the factory settings of its carburetor may be violated. Even a slight movement of one of the bolts by 1/5 of a turn will seriously damage the saw motor. In this regard, the operator must constantly ensure that the adjusting bolts are in the optimal positions set at the factory.
If for some reason the work of the node has been disrupted, then it will need to be reconfigured. For this, 3 adjusting bolts are provided in the assembly. The first of them is marked with the letter H. it is needed to tune the engine of the chainsaw when operating at maximum speed. The second screw marked L is used to adjust the motor when running at low rpm. The third screw can be labeled T, S or LA. Its task is to configure the internal combustion engine when operating in idle mode.
Chainsaw carburetor tuning must be carried out with a completely serviceable engine. Immediately before adjustment, you will need to inspect the air filter, and, if necessary, clean or replace it.
How to flush a chainsaw carburetor?
It is best to use a product that is commercially available in pressurized cylinders to remove stubborn dirt from the assembly. The kit includes a dispenser and a long thin tube that allows you to spray the product in any hard-to-reach places.
It must be remembered that cleaning the carburetor on a chainsaw is carried out using flammable chemicals. You need to work with them in a special protective mask and only in well-ventilated areas.
To clean the carburetor on a chainsaw, the unit will need to be partially disassembled. The throttle valve, adjusting screws, body and other carburetor parts will need to be rinsed with a bottle cleaner and set aside until completely dry. Once all the elements are dry, the unit can be assembled and installed back on the chainsaw.
Gasoline does not flow into the chainsaw carburetor
If the fuel does not enter the standard chamber, then this may indicate several breakdowns at once. The first step is to check the air and fuel filters. During long-term use of the saw, these elements absorb a large amount of dust, which further prevents the infiltration of clean air and fuel. A slightly dirty filter can be cleaned with gasoline, but if the part is clogged with a lot of dust, then it will need to be replaced.
Another reason for the malfunction is the needle. This part sticks, especially in Chinese-made chainsaws. To fix the problem, in most cases it will be enough to simply move the needle.
If no fuel enters the chamber, the saw owner should inspect the seals on the tool. After several months of using the tool, these parts lose their tightness. Over time, they begin to leak gasoline, as a result of which the instrument stops starting. Repair is carried out by replacing the oil seals.
The breather plays an important role when starting the saw. It is located near the saw’s gas tank cover, and performs 2 tasks at once. it maintains optimal air pressure and does not allow fuel to flow out. To check the breather, you will need to turn off the fuel pipe and see how much gasoline flows out. If it does not leak at all, then the standard breather is clogged with debris and dirt. In this case, you will need to clean the element and reinstall it.
If fuel does not enter the chamber, then you need to check the fuel line. Most often, a Chinese hose is used to complete a budget-class tool, which loses its tightness over time. In this case, it will be necessary to replace the line, paying special attention to the tightness of the channel joints.
Chainsaw carburetor device
Most modern chainsaws are equipped with nearly the same carburetors. They practically do not differ from each other, and work on a similar principle. The only difference between cameras from different manufacturers is the material from which they are made. In expensive American, Swedish and German chainsaws, cameras are made of reliable alloys, on which protective coatings are applied. Cheap Chinese and Korean chainsaws are equipped with nodes made from cheap materials.
Each carburetor consists of the following elements:
- aluminum body with one-piece construction. Inside the body there is an inlet fitting, a main screw, an impulse channel, a bolt for adjusting the engine 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;
- sprayer. designed to supply the fuel mixture directly to the carburetor chamber;
- float chamber. there is a float in it, which is triggered in the event of an insufficient amount of fuel;
- nozzles. are valves that are responsible for adjusting the amount of fuel.
This chain saw carburetor circuit is as simple and effective as possible. In some models of gardening tools, it can be supplemented with additional pipes, oil seals or filters.
The principle of operation of a chainsaw carburetor is quite simple. When the engine starts, the air damper located at the bottom of the housing opens. In this case, a vacuum is formed in the float and air chambers, caused by the movement of the piston. As a result, the standard diffuser is triggered, which begins to suck in air. The amount of intake air depends on the opening of the damper. When the piston is triggered, fuel begins to flow into the chamber through the inlet fitting. Its quantity and flow rate depend on the position of the nozzles.
Subsequently, the fuel in the air chamber begins to mix with air. After that, the finished air-fuel mixture passes through the intake valves, from where it is sent to the combustion chamber of the saw engine.
Why the chainsaw shoots the carburetor?
If, during the launch and operation of the instrument, its owner hears sounds resembling shots, then this indicates a malfunction of the unit in which the fuel is mixed. The reason for this, most likely, is the following malfunctions of the chainsaw carburetor:
- overtightened ignition. in this case, the fuel does not burn out, which leads to specific sharp shots;
- feeding a mixture with a low concentration of gasoline to the carburetor. to fix the problem, you will need to adjust the jets.
If the shooting sound comes from the muffler, the problem is that the fuel mixture is oversaturated with gasoline. If there is too little air in the fuel, then it will burn not only in the chamber, but also in the muffler. This will be evidenced by a large amount of carbon deposits on the inner walls of the muffler.
Carburetor device on chainsaw Carver
On most modern chainsaws (Carver is no exception), there are either completely the same type of carburetors from the same manufacturer (for example, Walbro), or very similar in design. But even with differences in the appearance of the case, the principle of operation of all carburetors is absolutely the same.
But the carburettors on Carver saws differ from other chainsaws in the availability of adjustment. The adjusting screws on most other saw models are hidden under the body and often have unique shaped notches. Therefore, they can only be adjusted with special “branded” screwdrivers, which are sold in service centers. The Carver carburetor is adjusted with a regular flat screwdriver. There are three holes for adjusting screws in the case. Therefore, the carburetor on the Carver chainsaw can be adjusted without even removing the cover.
How to set up a carburetor on a Carver chainsaw
The idle speed adjustment with the T screw is always separate. If the engine of your Carver chainsaw stalls at idle speed, this may be due to:
- poor performance of the spark plug;
- loss of compression due to critical wear of the piston system;
- poor fuel;
- poor carburetor performance, not related to adjustment;
- paraffin-clogged filters in the tank and carburetor.
For the same reasons, the engine of the Carver chainsaw can work poorly not only at idle, but in general it does not pull, does not develop speed, stalls when the throttle is pressed, etc. Therefore, you must first try to deal with these reasons. And last of all, if the problems are not solved, you can try to increase the idle speed by turning the screw T clockwise.
- If the engine does not start at all at idle precisely because of a misalignment, the T screw is tightened 1/2 or 3/4 of a turn and the engine is started.
- Then it is adjusted by ear with the engine running, observing all safety measures. (With a strong increase in speed, the chain of the chainsaw may start to rotate, and this is dangerous).
- If the chain is spinning at idle, the screw T is unscrewed back to a position in which the engine at idle works confidently and does not stall, and the chain does not spin.
Then they check the operation of the chainsaw engine in all modes. If it runs stably at idle, but stalls when the gas is pressed, it is a sure sign of a lack of fuel supply to the combustion chamber. With proper operation of all systems, clean filters and nozzle, the cause is most likely a violation of the adjustment of the screw L.
How to Tune a Carburetor on a Chainsaw! EP 73
- It is also better to adjust it on the running warm engine of the Carver chainsaw, screwing in 1/4 of a turn and trying to gas.
- If the fuel supply is too abundant, the engine will run as idle with the full throttle. This means that the screw L is tightened too much and it is necessary to unscrew it back in steps of 1/4 turn, trying to give gas.
If, after adjusting screw L, the Carver engine does not deliver the power required for operation, you can carefully try to increase the maximum speed by adjusting screw H.
It is also adjusted with the engine running, but with the full throttle position. Extremely carefully, 1/5, 1/6 of a turn, the screw is screwed in and listened to the engine operation.
An increase in the speed ceiling can slightly extend the life of an old chainsaw with a worn piston. Weak compression is compensated by a higher mixture flow at maximum speed.
In new chainsaws, you should not experiment with such an adjustment.
Professional adjustment of the screw H is carried out using a tachometer to determine the speed ceiling and an oscilloscope to control the frequency of flashes on the candle. Compression is checked beforehand.
After adjusting the screw H, there may be a change in operation in other modes. Therefore, it will be necessary to test the operation in all modes and, if necessary, again slightly adjust the adjustment with the screws L and T.
Many recommend adjusting the screws by tightening them all the way and then turning them out 1.45 or 1.5 turns.
It is not always worth doing this for the following reasons:
- With a strong twist, the sharp end of the screw can destroy the loose powder bronze jet on cheap chainsaws, and this is a breakdown.
- 1.45-1.5 turns from “to the end” may not correspond to the old position of the screws, at which the chainsaw still worked to the last, and to the real factory settings.
Therefore, it is necessary to regulate on the basis of the “as was” position by no more than 1/4 of a turn at a time. It is important to remember how much and in which direction the position of the screw was changed.
If you still need to turn the screw “to the end”, count the number of revolutions from the “as it was” position, this will make it possible to return the settings to the previous position. It is necessary to tighten “to the end” without effort.
The general principles of self-tuning the carburetor of a chainsaw are presented in the following
The main components of the Carver carburetor
The chainsaw carburetor consists of the following main components:
- cast body made of light alloy;
- diaphragm pump for manual pumping of fuel before starting (suction);
- nozzles (strictly calibrated holes in bronze bushings for metering fuel supply);
- float chamber;
Also in the carburetors of chainsaws there are fuel channels, a throttle (gas) adjustable throttle, an air damper, filters and adjusting screws.
What the three carburetor screws L, H, and T regulate.
On older models of chainsaws, there are only two adjusting screws. One of them adjusts the idle speed by simply raising the throttle. When it twists, the passage under the flap increases, the supply of fuel to the combustion chamber increases, the engine rises. Essentially, twisting “adds throttle” without pressing the throttle grip.
Chainsaw Carburetor | How to Tune & Adjust ‘Correctly’
In modern Carver chainsaw carburetors, the idle adjustment screw T does not regulate the throttle position, but the amount of fuel flowing through the idle jet.
The L screw has a sharp needle-shaped tip inside and regulates the main fuel flow through the calibrated orifice of the jet.
There are two such screws in modern models. One. L, regulates the main fuel flow at low and medium speeds (not to be confused with idle). The second. H, determines the fuel supply at maximum speed.
Poor adjustment of the H screw can lead to unpleasant consequences. For example, the internal combustion engine of the Carver chainsaw, designed for a maximum speed of 12 thousand rpm with full throttle, will develop up to 15 thousand rpm and fail. over, any adjustment only H leads to an imbalance in the fuel supply, and the engine can “sag” at certain speeds.
When customization is required
Modern “three-screw” carburetors of Carver chainsaws are practically not designed for manual adjustment at home. The screws are provided for factory setting, are securely fixed against rotation during vibration by tenacious springs and do not arbitrarily change their position.
But the screws on the carburetors of Carver chainsaws are available for adjustment through special holes without removing the casing, with a regular screwdriver. This suggests that such models structurally need to adjust the carburetor from time to time.
The reason for this, from a technical point of view, cannot be precisely named. Only versions are possible:
- The carburetor of the Carver chainsaw is in an area of increased vibration, because of this, the screws spontaneously unwind.
- Coarse spring installed, which cannot fix the screw like on other models.
- Periodic adjustment is required due to the technical features of the carburetor and the internal combustion engine of the Carver chainsaw as a whole.
Adjustment and device of the Carver chainsaw carburetor
The carburetor of the internal combustion engine of the Carver chainsaw is responsible for supplying a correctly metered fuel-air mixture. By increasing the mixture supply, when the throttle handle is pressed, the engine speed increases. Consistent idling is also dependent on proper carburetor operation. This is an important chainsaw system and you need to have an idea of how it works, know the basics of diagnostics, and also be able to adjust and repair.
- Carburetor device on chainsaw Carver
- The main components of the Carver carburetor
- The principle of operation of the Carver carburetor
- What the three carburetor screws L, H, and T regulate.
- When customization is required
- How to set up a carburetor on a Carver chainsaw
- Carver saw carburetor repair: possible malfunctions and their elimination
The principle of operation of the Carver carburetor
After starting the internal combustion engine of the chainsaw, the air damper opens, through which the purified air enters the diffuser with a fine filter. Gasoline gets there through the calibrated holes in the jets. The amount of air-fuel mixture that enters the combustion chamber from the carburetor is regulated by the position of the throttle valve connected with the throttle lever.
Correct Way To Adjust Or Tune The Carburetor On A Chainsaw. Video
The needle valve shuts off the flow of gasoline into the carburetor when it is filled. Gasoline passes through the filter before entering the nozzles, which reduces the risk of clogging the calibrated holes in them.
Step-by-step instructions for disassembly
The carburetor device of models of different brands is almost the same, so take the Partner chainsaw as an example. We carefully remove each element and put it in order, so that later it would be easier to assemble.
Chainsaw carburetors from different manufacturers, if they differ, it does not matter
The top cover is removed by loosening three screws. Followed by foam rubber, an integral part of the air filter.
The arrows indicate the bolts that must be unscrewed to remove the cover
Then we remove the fuel hose, followed by the drive rod.
The upper arrow points to the fuel hose, the lower arrow points to the drive rod
Next, remove the tip of the cable.
The arrow shows the end of the cable to be removed.
On the left from the fitting, we pull together the gasoline hose.
We also carefully remove the gasoline hose indicated by the arrow
We finally disconnect the carburetor, it is ready for adjustment. Its mechanism is rather complicated, therefore, if further disassembly of the carburetor is required, the elements should be removed very carefully. they are small, so they can be lost.
The carburetor consists of many small parts, which should be laid out in order during disassembly.
Chainsaw carburetor device
Not a single repair event is complete without knowledge of the basics of the mechanism. By understanding the constituent elements and the principle of operation, it is easier to determine the cause of the breakdown.
Any malfunction in the carburetor threatens to stop the engine
The carburetor is one of the main functional parts of the engine, which serves to prepare and supply a fuel mixture consisting of certain proportions of fuel and air. As soon as the proportions are violated, the engine starts to “junk”, or even stops working altogether.
You can achieve the correct operation of the carburetor by examining its “stuffing”:
- Cross-flap tube for air flow regulation.
- Diffuser. Constriction to increase the air flow rate, located near the fuel inlet.
- Sprayer from which fuel comes (fuel needle in the diagram).
- Float chamber that regulates the fuel level at the entrance to the channel.
This is how it looks in the diagram:
The diagram shows the interaction of fuel and air flow
How it works: A jet of air in the diffuser atomizes the fuel, creating a mixture that enters the cylinder. The greater the amount of fuel supplied, the higher the engine speed. Different carburettors work in the same way.
When is adjustment necessary at all?
Specifically, adjusting the carburetor of a chainsaw is required in rare cases, more often problems arise related to the flow of fuel or wear of parts. But sometimes the “symptoms” indicate that it is necessary to precisely adjust the mechanism. Here are some signs:
- After the engine starts, it immediately stalls. Alternatively, it will not start at all. The reason lies in the excess of air and lack of fuel.
- Increased fuel consumption and, as a result, a large amount of exhaust gases. This is due to the reverse process. oversaturation of the mixture with fuel.
The reasons for the adjustment failure can be mechanical:
- Due to strong vibration, the protective cap is damaged, as a result, all three bolts lose their established fixation.
- Due to wear on the piston part of the engine. In this case, adjusting the carburetor of the chainsaw will only help out for a while, it is better to replace the worn part.
- Due to clogging caused by low-quality fuel, scale or damage to the filter. The carburetor requires complete disassembly, flushing and adjustment.
If the chainsaw suddenly stops working, you need to disassemble it to find out the reasons
Chainsaw carburetor adjustment: we analyze all the technical nuances of the work
Summer cottage construction and repairs are not complete without the use of a chainsaw, as well as garden maintenance. Due to a malfunction of the tool, all work can get up, so it is so important to be able to disassemble it yourself, find problems and fix them. With enough experience and dexterity, it is even possible to adjust the carburetor of a chainsaw. a complicated procedure, or rather, jewelry. How to carry out the adjustment procedures, we suggest you disassemble today.
Features of setting and adjustment
To find out how to adjust the carburetor on a chainsaw, you should learn to distinguish between three screws (some models have only one).
The L and H screws are similar only in appearance, in fact, they are different
Each screw has its own letter designation:
- “L” is for setting low rpm;
- “H” is needed to adjust the upper speed;
- “T” is needed to adjust the idle speed (models with one screw only have it).
The factory setting is optimal, and with the help of the screws they adjust the operation of the engine in special situations (work associated with different climatic conditions).
The diagram shows the outputs of the carburetor adjustment screws with the lid closed
A special tool is used to set up the chainsaw.
Adjustment is carried out only with screws L and H. To increase the speed, turn them clockwise. To decrease. counterclockwise. The sequence of using screws: L. H. T.
If you have doubts about the adjustment, it is better to contact a specialist, since an incorrect setting can damage the engine.
Idle speed adjustment
First of all, you need to find the position in which the idle speed will be highest by turning screw L. When you find this position using the tachometer, you need to turn the low speed screw (L) a quarter (1/4) counterclockwise. The chainsaw chain can rotate during this process. If this happens, loosen the idle screw (T) counterclockwise until the chain stops moving completely.
How to set the maximum speed of the chainsaw?
To change the maximum revolutions, you need to interact with screw H. If you tighten the screw, the revolutions will become higher, and if you unscrew. lower. As a rule, the highest permissible engine speed ranges from 11500-15000 per minute. If you try to work with an even higher number, the ignition problem will begin. In this case, the screw is slightly unscrewed.
In what cases is it necessary to adjust the carburetor of the chainsaw?
Here is a list of the most common cases in which you need to adjust the carburetor of a chainsaw:
- The engine starts, but the chainsaw stalls, or it cannot be started at all. Too much air in the fuel chamber may be the cause.
- Increased fuel consumption. It can occur due to excessive saturation of the mixture that enters the engine with fuel. For the engine to work well, the mixture must be of good quality.
- The bolts in the carburetor have lost their hold due to a damaged carburetor housing.
- Debris entering the carburetor. This can happen if the filter is damaged or poor quality fuel is used. You will need to completely disassemble the carburetor, flush it and re-adjust.
- Engine idling poorly or not developing full power.
Important! If the engine is not performing well due to a worn piston, carburetor tuning will not work. In addition, along with the adjustment, it is advisable to clean the carburetor of debris. this will increase the efficiency of the procedure.
Basic carburetor adjustment
Screws H and L must be turned clockwise as far as the stop and then turned 2 turns in the opposite direction. This is the standard procedure for setting up popular chainsaws for the first time. Other options are also possible.
Chainsaw carburetor adjustment
Chainsaws are a very popular gardening tool. They have gained great popularity among gardeners and those who care for the territory in the local area. Chainsaws are not complete without construction or repairs. Chainsaws are even more important in the lumberjack profession.
Any chainsaw requires proper care, maintenance and adjustment before operation. Overloading the tool can shorten its useful life and damage the tool.
Today we will talk about that part of the chainsaw mechanism, the task of which is to prepare the fuel before it is fed into the engine cylinder. This function is performed by the chainsaw carburetor. It will depend on him how well the chainsaw works and how much fuel it spends during operation. If you see that the petrol chain saw is not working properly, the carburetor may need to be adjusted.
How does a carburetor work?
- When the engine is started, the choke is opened in the carburetor.
- The movement of the piston reduces the pressure in the air valve. This causes air to flow into the diffuser. The exact amount depends on the position of the air damper.
- Fuel enters the float chamber. The jets regulate the speed at which this happens.
- Gasoline and air mix with each other in the diffuser to form a fuel-air mixture. She goes to the cylinder. The mixture can be lean (a lot of air, little gasoline) or rich (little air, a lot of gasoline). The amount of the mixture entering the engine is directly proportional to its power and speed.
All processes occurring in the engine are not cyclical, but a constant basis.
A carburetor is a mechanism that is responsible for preparing a mixture of fuel and air, which is then fed into the engine cylinder. Most chainsaws have very similar carburetors, so they are set up in the same way.
The main structural details of the chainsaw carburetor:
- Aluminium case. Aluminum is chosen as a material for its low weight. Chainsaws are a tool that must always be held in hand and carried, therefore, reducing the weight of the tool is a very important task facing the manufacturer.
- Diffuser and air damper, which are located at the carburetor inlet.
- Jets. valves that provide the dosage of fuel that is supplied to the carburetor.
- Sprayer, which is responsible for injecting fuel into the chamber.
- Fuel chamber.
How to properly adjust the chainsaw carburetor
The vast majority of gasoline saw carburetor models have three adjustment screws:
- idle speed (T);
- low speed (L);
- high speed (N).
Setting the required parameters is done by rotating these screws.
Use an electronic tachometer to fine tune the carburetor. It will make it easy to determine the engine speed of the chainsaw.