How to Clean a Makita Carburetor on a Lawnmower
Adjustment of carburetor chainsaw Makita
Adjusting the carburetor of a Makita chainsaw affects the performance of the device, the quality of work. To properly configure the working node of the equipment, it is important: to understand the principle of its operation, have the necessary tools, take care of the fasteners, as well as closely spaced elements responsible for the operation of the chainsaw.
Features carburetor settings Makita
Makita chainsaw carburetor works on the same principle as carburetors produced by other manufacturers. This important detail is responsible for mixing fuel with air. In order to prevent the operation of the device, Makita chainsaw is adjusted. This will help protect the motor equipment.
By adjusting, you can:
- eliminate the risk of creating a “lean” mixture with a carburetor;
- minimize the risks of creating a supersaturated mixture, which adversely affects the operation of the motor, causing rapid wear.
If you need a new carburetor for a Makita chainsaw (you will adjust, focusing on standard instructions), choose the one that is identical in structure to the original.
- The basis of the basics is a tube for air passage, which is connected to the valve (in the middle). The location of this part affects the amount of air that enters the engine during operation.
- Diffuser. It is not difficult to identify it, with careful consideration of the components of the carburetor. This part looks like a narrow tube, the main function of which is to adjust the air flow rate.
- The channel that supplies fuel from the float chamber (connected to the nozzle).
- A separate design that stands out from the others is the float chamber, which looks like a standard tank for fuel fluids.
Adjustment of the carburetor of the Makita chainsaw is carried out with a set of adjusting screws that are in the body of this design:
- screw marked L. corrects low revs;
- screw marked H, due to which high speed is adjusted;
- T screw to adjust carburetor idling.
Preparing for adjustment:
- The engine is allowed to warm up (start the chainsaw for 10 minutes).
- Checking the air filter and cleaning this part.
- Stopping the chain by turning the screw marked T (turn all the way).
Carry out the following settings:
- put the chainsaw on a flat surface;
- After removing the chain, set aside.
To diagnose problems with the carburetor use a tachometer.
Important! Masters advise listening to the sound that the screws make when turning. A squealing sound may indicate a mixture is oversaturated.
Algorithm of actions for customization
Carrying out the carburetor chainsaw in two stages:
- base stage (engine on);
- Stage Two. Perform when the engine is warm.
Important! Some configuration steps need to be adjusted, depending on the Makita chainsaw model. In order to do everything right, read the instructions.
Standard algorithm of actions.
- We turn the screws for adjusting the high and low revolutions all the way (turn clockwise).
- At the moment of the meeting of resistance, make a half turn back.
A screw marked T is moved clockwise. Release it only when the engine starts to work stably. At the same time, keep in mind that the chain should not move at this stage.
What should I do if the engine turns off during idle tuning? In this case, it is important to quickly turn the screw all the way (turn clockwise). If manipulation leads to chain movement, the adjusting screw is rotated slowly to its previous position.
How to check if the carburetor is set correctly?
To do this, speed up the work of the chainsaw. Start the engine at maximum speed to objectively evaluate its operation. When you click on the accelerator, the rotation speed should reach about 15 thousand revolutions per minute. This indicator indicates that the carburetor setting was successful.
If you cannot achieve such an indicator at high speeds, and the acceleration is slow, you need to adjust the carburetor again, working only with the screw that has the mark L. Rotate it counterclockwise. In this case, the screw must be rotated slowly so that the rotation does not exceed 1/8 of the full rotation.
If the opposite problem arises and the maximum rotation indicators need to be reduced to 15 thousand, you need to rotate the screw marked with the letter H. Rotate it slowly, slowly in the opposite direction of the clockwise movement.
Reducing the RPM to the optimum value will reduce the risk of engine wear.
Makita chainsaw carburetor adjustment Link to main publication
Makita Chainsaw Carb Adjustment
DIY carburetor setup for chainsaw
For an independent carburetor option, it is necessary to familiarize yourself with its device and clarify the procedure for the work that is carried out to adjust the parts responsible for the proper functioning of the component parts of the device and parts close to it.
It is necessary to carefully handle objects for the system option, and also determine the compliance of the set characteristics with very acceptable values.
About carburetor design
The carburetor is used to mix a combustible consistency with air, subject to well-established proportions. If clear doses are not respected, the health of the motor is at risk. When a huge amount of air enters during the mixing of the component, and there is not enough fuel, such a mixture is considered to be “poor”.
It should not be allowed and oversaturation, because with a large amount of fuel in comparison with air, malfunctions or deterioration of the motor are also likely. Adjustment of the carburetor is necessary not only before the initial implementation, but also when any differences in its work are revealed. Before working with a chainsaw, do not forget to run it in.
The carburetor design contains a standard set of parts, but may vary slightly depending on the manufacturer. Components:
- The basis. This is a special tube that visually resembles an aerodynamic design. Air passes through it. In the transverse direction, a shutter is located in the middle of the pipe. Her position can be changed. The more it is pushed into the passage, the less air enters the engine.
- Diffuser. This is the lent out part of the tube. With its help, the air supply rate increases in the segment where the fuel comes from.
- Channels for supplying fuel. The fuel mixture is contained in the float chamber, then passes into the nozzle, from which flows into the spray.
- Float chamber. It is a separate structural element that resembles the shape of a tank. Designed to constantly maintain an optimal level of fuel fluid before entering the channel from where air comes.
Not sure which chainsaw to choose? Read our article.
Looking for cheaper models, but reliable and time-tested? Pay attention to Russian-made chainsaws.
Or explore overseas chainsaw manufacturers such as Stihl.
What you need to have to configure
Each carburetor owner must have the necessary tools to adjust this system. There are three adjusting screws that are located on the device. They have their own markings:
- L. screw for low speed correction.
- H. screw for adjusting high revs.
- T. regulates idling, in most cases it is used for experiments.
Chainsaw Air Filter
Before adjusting the carburetor, you need to prepare the device:
- The engine warms up, that is, it starts about 10 minutes before repair, and turns off when work starts (see how to start a chainsaw).
- The air filter is checked and flushed.
- The chain is stopped by turning the T screw all the way (see chain oil).
To carry out safe repairs, you need to prepare a flat surface where you can neatly position the device and unscrew the chain in the opposite direction. Need a tachometer. It determines the presence of a malfunction in the carburetor. When turning the screws, the sound should be perfect and absolutely even. If screeching notes are noticed, then the mixture is oversaturated.
Carburettor adjustment is divided into two main stages. The first is called basic. It is made with the engine turned on. The second is performed when the engine is warm.
To carry out the carburetor setup procedure successfully, you need to familiarize yourself with the operating instructions for a particular model in order to identify additional features of the device settings.
The adjusting screws for the highest and lowest revolutions should be carried out clockwise until the highest resistance is encountered. When the screws reach the stop, you need to translate them in the opposite direction and leave when passing 1.5 turns.
The chainsaw Makita dcs 4610 will not start
Spare parts for Makita chainsaws. Repair of the Makita dcs 4610 chainsaw, repair.
Makita (Dolmar) Interesting Case
The Makita / Dolmar chainsaw will not start. There is compression, the carburetor was changed. But an interesting case was discovered.
The engine turns on at medium speed and warms up like this for about 10 minutes. The idle adjustment screw should be clockwise. It is released only when the engine comes into stable operation. It must be ensured that the chain does not move during this process.
In idle mode, the engine may stall (the reason is here). In this case, immediately adjust the adjusting screw clockwise to the stop. Sometimes the chain begins to move. In this case, turn the adjusting screw in the opposite direction.
You need to do a little research. The acceleration of the device is initiated. It is necessary to evaluate the serviceability of the engine during maximum revolutions. When the engine is functioning correctly, then when you press the accelerator, the speed increases rapidly to 15,000 rpm.
If this does not happen or the speed increase is too slow, you must use the screw marked with the letter L. It turns counterclockwise. It is necessary to observe moderate movements, since the turn cannot be more than 1/8 of the full circle.
To limit this figure, you need to use a screw marked H. To increase the number of revolutions, turn it clockwise, and to decrease it in the opposite direction. The maximum frequency must not exceed 15,000 rpm.
If you make this figure more, the engine of the device will run to wear, which will lead to problems in the ignition system. When rotating this screw, the ignition processes of the device must be taken into account. If the slightest glitches appear, then the maximum speed value must be reduced.
Final idle check
Before this procedure, it is necessary to perform a full adjustment of the components of the carburetor when operating at maximum speed. Next, you should check the operation of the device in idle cold mode. When the correct parameters are achieved during adjustment, you can notice the exact compliance of the carburetor design with the following criteria:
- When the idle cold mode is connected, the circuit does not move.
- When even pressing the accelerator a little, the engine accelerates at an accelerated pace. With a gradual increase in pressure, you can notice that the engine speed is proportionally increasing, reaching the maximum allowable values.
- When the engine is running, you can compare its sound with a four-stroke device.
If violations are noted in the above parameters or the device was not fully adjusted, you need to perform the main setup step again. Sometimes actions are performed incorrectly. In this case, the device may fail due to the loss of the correct node settings. In this case, you will have to contact a specialist.
Dismantling the carburetor if necessary to check or repair the components
The device of different models of carburetors is almost the same, therefore, when working with them, you can use the standard scheme. All elements must be removed carefully and then laid out in the order below, so that you can successfully arrange the objects in place after the completion of the repair work.
Top cover removal
- The top cover is removed. To do this, unscrew the 3 bolts holding it in a circle.
- Foam is also removed, as it is the upper part of the filter that conducts air.
- The fuel hose is removed.
- The drive rod is displayed immediately on it.
- The cable tip is disconnected.
- The gas hose can be completely removed by steadily pulling it off the fitting.
Video: How to Clean a Makita Carburetor on a Lawnmower
To finally prepare the carburetor for overhaul or replacement of the smallest details, you need to carefully disconnect it from the main system. Sometimes it requires further disassembly. Unscrew the components carefully and fold the fasteners in groups, as these small parts are easily lost.
Instruction for chinese
To correctly configure the carburetor of a Chinese chainsaw, you must first remember the factory settings of the device, then turn on the engine. In the future, you will have to leave it to work for several hours to accurately set your own parameters. Sometimes work is performed once after a ten-minute operation of the engine, but many Chinese-made models require special handling.
Chinese model of chainsaw
- Events begin at idle. Using the adjusting screws, you need to achieve a systematic set of revolutions by the engine, so you should first let it work at low speeds. A deviation from the norm is the movement of the chain along the bus. In this case, it is necessary to adjust the extreme position of the extreme screws so that the chain remains stationary.
- The transition to medium speed revolutions. Sometimes the engine smokes at the same time. This defect can be eliminated by tightening the screw to supply a leaner fuel mixture.
In this case, the smoke will disappear, but the engine speed will increase. It is necessary to adjust the settings to the level where, when you press the throttle, the engine gains speed, sharp jerks or interruptions are not heard.
Look at the video clearly:
In order for the chainsaw to work properly, it is necessary to carefully carry out work on adjusting the carburetor in exact accordance with their priority. If there are any malfunctions in the operation of the device, you must independently perform its complete disassembly. In most cases, replacement of any parts that have become unusable is required.
With a constant check of the quality of the carburetor settings and the implementation of timely actions to improve its operation, there are no problems with the chainsaw.
About which chainsaw to choose. read here.
Makita Chainsaw Carb Adjustment
Do-it-yourself carburetor adjustment on a chainsaw Adjusting the carburetor of a chainsaw ensures efficient operation of the tool at full power with economical fuel consumption. Hyundai lawnmower carburetor adjustment. Adjustment
Adjusting the carburetor of the chainsaw ensures efficient operation of the tool at full power with economical fuel consumption. Adjustment of revolutions of a stig lawn mower. Adjustment must be carried out with a clean fuel and air filter. Carburetor adjustment of Chinese lawn mowers. Carburetor adjustment of huter gas trimmer. For a larger number of carburetors, the adjustment is carried out by 3 screws: for high and low revs and idle adjustment.
The H and L screws adjust the gas to air consistency ratio determined by the opening of the carburetor throttle. Carburetor device on a lawn mower. When the screws are loosened, the consistency is enriched, and the revolutions accordingly fall; when the screws are twisted, the mixture becomes leaner. the revolutions increase.
The designation H refers to the highest-speed propeller controlling the main jet, L to the low-speed propeller controlling the idle jet. Setting the carboturator of the gas trimmer photon mk 4300. Adjusting the carburetor is a Japanese trimmer. Using screw S, the idle speed is clearly adjusted. Favorite carburetor carb adjustment. From time to time, to simplify the option, the number of carburetor adjusting screws available is reduced.
Setting the carburetor of the chainsaw is divided into two steps. the basic (factory options), carried out with the engine turned off, and the final one, made with the engine running warm. Adjustment of turns of a lawn-mower Makita. The precise angle of rotation should be taken from the operating instructions for a particular chainsaw. Carburetor adjustment of lawn mowers Euroscart. Failure to comply with the manufacturer’s annotations may result in damage to the motor.
The chainsaw Makita dcs 4610 will not start
Spare parts for Makita chainsaws Repair of Makita dcs 4610 chainsaws, repair
Makita (Dolmar) Interesting Case
The Makita / Dolmar chainsaw will not start. There is compression, the carburetor was changed. But a fascinating case was found.
Basic carb adjustment.
The adjusting screws of the largest H and small L revolutions are slowly turned clockwise until they stop, after which they are unscrewed by 2 turns, other options are also possible
Check and adjustment of idling.
We find the largest idle speed, for this, slowly turn the screw L in different directions. After finding the position of high engine speeds, turn screw L 1/4 turn counterclockwise. If at the same time the chain is spinning at idle, screw T or (S) should be turned just clockwise until it stops.
Checking and adjusting the highest number of revolutions.
The change in the largest number of revolutions is carried out by the screw H. When it is turned around (clockwise rotation), the turns increase, when turned out, they decrease. Carburetor adjustment of the Chinese trimmer. Husqvarna gas trimmer carburetor adjustment. Chainsaw engines have the highest rotation speed of 11,500 rpm. up to 15000 rpm Ignition does not provide a higher speed, in addition, it becomes unsafe for the motor. The maximum speed can be found by interruptions in the ignition. If they come, screw H slightly unscrew counterclockwise.
If the motor is not tested for acceleration and the highest revolutions, then the adjustment of the chainsaw cannot be considered complete.
With a smooth pull of the gas trigger, the engine must confidently and rapidly gain momentum from idle to the highest (from 2800 rpm to 11500-15000 rpm, depending on the unit). If rpm is slow, delayed, screw L must be slowly unscrewed counterclockwise, but less than 1/8 turn.
After adjusting the acceleration and the highest revolutions, you should again check the saw idle. the engine should work stably, the chain should not move. The setting of the chainsaw should be repeated if this condition is not performed but except for the basic adjustment step.
DIY Makita Chainsaw Repair
DIY chainsaw repair
All malfunctions of chainsaws can be divided into two main groups: problems of the engine with all its components and systems (ignition, fuel supply system, cylinder-piston group, exhaust system) and malfunctions of other components (chain brake, lubrication system, clutch, tire, etc.).
- the engine will not start;
- Starts up, but stalls;
- it is unstable;
- does not develop power, i.e. normally works at idle, but stalls under load.
When repairing a chainsaw with your own hands, it is necessary to act as an exception. alternately inspect all the possible causes of the malfunction, starting with those that take the least time to check and eliminate (see here for the design and operation of the two-stroke motor).
Ignition system. Almost all types of engine malfunctions listed above can be caused by ignition system malfunctions. Therefore, when they occur, it makes sense to start troubleshooting with a candle. This is all the more justified because the state of the latter can provide useful information about the operation of the fuel system. So, if a problem occurs, you need to turn out the candle and inspect it.
The wire is disconnected, and the candle is twisted with a special key.
If the candle is dry, it means that the problem is most likely not in the ignition system, but in the fuel mixture not entering the cylinder. DIY chainsaw repair according to all the rules. You can wrap the candle back and take up the fuel system. If the candle is heavily sprayed with the fuel mixture, then there is an excess of it. Everything about repairing a chainsaw with your own hands carburetor adjustment saw homelite 4518. This may occur due to misregistration of the carburetor or violation of the start rules. The candle is wiped and dried, the cylinder is drained, cutting off the fuel supply and working as a starter. to vent the combustion chamber and remove excess fuel. To repair a chainsaw with your own hands, how to repair a chainsaw. Then set the candle in place and repeat the launch.
The presence of a large amount of black soot also indicates a malfunction in the fuel system.
The ratio between oil and gasoline in the mixture may be violated, the carburetor is not adjusted, or poor-quality oil is used. The candle is washed in gasoline, cleaned with a needle or an awl of carbon deposits, clean the electrodes with a fine sandpaper and put in place.
In all these cases, it is not superfluous to check the gap between the electrodes of the candle. Depending on its brand, it should be in the range of 0.5-0.65 mm. It is necessary to check the sealing gasket of the candle. If it is worn or damaged, the tightness of the combustion chamber may not be ensured, which leads to a decrease in compression in the cylinder and problems in the engine.
Even if in the case of checking the spark plug there is good reason to believe that the fault is in the fuel system, you need to check the spark plug for a spark. At least in order to be sure that everything is in order with this. For this:
- put on the spark plug cable;
- using pliers with insulated handles, apply thread or nut to the cylinder;
- pull the starter handle and look. there is a spark or not.
If there is no spark, you just need to replace the candle. DIY chainsaw repair: lubrication system. As a rule, a chainsaw works in conditions far from cleanliness. If the new candle does not have a spark, it is necessary to check the condition of the high-voltage wire for an open and contact with the candle.
The reason for the absence of a spark can also be a faulty ignition module or a violation of the gap between it and the flywheel magnetic circuit. It should be 0.2 mm. Violation of the gap becomes especially likely if before that the saw was disassembled with the flywheel and the ignition module removed. The clearance is set using a 0.2 mm thick gasket placed between the flywheel boss and the ignition module. Defective ignition module must be replaced.
Having checked the ignition system in this way and not having detected a malfunction, we can proceed to the fuel mixture supply system.
Fuel supply system. If inspection of the spark plugs found that fuel does not enter the cylinder, you need to consider all the possible reasons for this. Do-it-yourself Makita chainsaw repair. It could be:
- non-receipt of fuel from the tank due to a clogged hole in its cap (breather), while a vacuum is created in the tank that prevents fuel from flowing out;
- contamination of the fuel filter installed in the tank;
- not receipt or insufficient supply of fuel mixture from the carburetor to the cylinder.
To diagnose the first two reasons, it is enough to disconnect the fuel hose from the carburetor and see if fuel flows out of it or not. If it flows fully, the breather and filter can not be checked, if it does not or weakly flows, we can assume that the cause of the malfunction is found. The breather is cleaned with a needle. The fuel filter is removed through the filler hole of the empty fuel tank with a wire hook, together with a suction hose, from which the filter is disconnected and cleaned or replaced with a new one. Carrying out do-it-yourself chainsaw repairs, chainsaw repairs are not complete without cleaning. Chainsaw manufacturers recommend changing the fuel filter every 3 months.
Diagnosis of major breakdowns and repair of a Makita chainsaw
Diagnostics of the main malfunctions of chainsaws and repair of Makita chainsaws. As well as cleaning the carburetor chainsaw
The chainsaw Makita dcs 4610 will not start
Spare parts for Makita chainsaws Repair of Makita dcs 4610 chainsaws, repair
An insufficient supply of the fuel mixture from the carburetor to the cylinder or a violation of the correct ratio between the fuel and air mixed in the carburetor can occur for several reasons: due to clogging of the air filter, unregulated carburetor, clogging of its channels or mesh filter.
As a rule, repairing chainsaws is not complete without cleaning the air filter, since it gets dirty quite quickly. When this happens, air intake to the carburetor decreases, the fuel mixture at the outlet of it turns out to be too enriched, which disrupts the normal operation of the engine. Carefully remove the dirty filter for cleaning so that dirt does not get into the carburetor. The filter should be cleaned or washed in water with some detergent, dried and installed again.
Carburetor misregistration is eliminated by its adjustment. This is usually done with three screws. maximum and minimum idle speed and propeller. Adjustment must be carried out in strict accordance with the instructions, non-observance of which can lead to engine damage. Some saw manufacturers leave only one adjusting screw (idle). to exclude unwanted interference by inexperienced users in the carburetor. For an example of adjusting the carburetor of a chainsaw, see the article Working with a chainsaw.
If the carburetor adjustment did not help, you need to clean its channels and filter mesh, and at the same time check the integrity of the membrane. Carburetor. one of the most complex chainsaw devices, so proceed with disassembling and cleaning it with a full understanding of the responsibility of this operation. It consists of many small parts that have the peculiarity of quietly popping out of their seats and irretrievably lost, so that, having disassembled this capricious device, you can not assemble it.
Below is a diagram of another carburetor chainsaw.
If there is no experience and self-confidence, it is better to entrust the repair of a chainsaw carburetor to a service center specialist. Sometimes for high-quality cleaning of the carburetor it is necessary to apply ultrasonic cleaning.
Muffler. Often the cause of engine malfunctions, especially when the engine is operating normally at low revs and stalls under load, becomes clogging of the silencer’s spark arrester, which prevents normal exhaust, from the combustion products. Repair in this case consists in removing the muffler, disassembling (if it is collapsible) and wet cleaning it from soot using detergents. The non-separable muffler is dried with a hairdryer after washing. Remember that soot contains substances that are carcinogens, and dry cleaning, which may result in inhalation, is unacceptable. When removing the muffler, the engine outlet is plugged with a clean rag.
One of the reasons a muffler may clog. this is the use of a fuel mixture with an excessive amount of oil (the amount of oil is more than recommended by the manufacturer), and the use of either non-suitable oil for two-stroke engines or low-quality oil.
Cylinder-piston group. DIY repair of Husqvarna and Stihl chainsaws: video. Malfunctions of the cylinder-piston group are the most serious. This is the deterioration of the cylinder and piston, scratches and seizures on their surface, wear or sinking in the grooves of the piston rings, wear of the crankshaft bearings. Most of these malfunctions lead to a drop in pressure in the cylinder and, as a consequence, to the inability to start the engine, or its inability to give full power. There are several ways to assess the status of a cylinder-piston group (CPG).
You can remove the muffler and look through the opened window, in which a part of the side surface of the cylinder is visible. Despite the limitations of the review, a general idea of the state of the CPG in this way can still be obtained.
It is useful to measure the compression in the engine, which is quite informative regarding the condition of the parts of the CPG. Do-it-yourself chainsaw repair Start the do-it-yourself chainsaw repair from the chainsaw yourself. Everything about repairing a chainsaw with your own hands should be washed in a carburetor c. The operation is carried out using a compressor installed in the candle hole.
The crankshaft is rotated using an electric motor (drill) with a flexible shaft or manually by a starter, while controlling the pressure on the pressure gauge. The last for a workable chainsaw should be at least 8-9 atm (0.8-0.9 MPa). With its decrease, engine power also drops. At a pressure of 5 atm, the engine may perhaps work, but only at idle.
Accurately assess the state of the CPG can only be fully disassembled the engine. disconnecting the crankcase from the cylinder and removing the piston. If the latter has scuffs, chips or deep scratches, it must be changed. In relation to the cylinder, when developing or damaging the surface, it is possible to squander it under the repair size. The cause of low compression may be wear and coking of the piston ring. The serviceable ring should be clean of carbon deposits, sit in the piston groove freely and firmly pressed against the inner surface of the cylinder.
Chain lubrication system
With a significant (small is considered normal) oil leakage, it is necessary to check the tightness of the connection of the tubes to the pump fittings. They may fall or crack. Violation of the tightness of the oil pipe, in addition to sagging, can lead to insufficient lubrication of the chain. The pump begins to suck in air, which affects its performance. The leak is eliminated by replacing the tubes or sealing them with sealant.
The most serious damage to the lubrication system are cracks in the oil pump housing. In this case, it will have to be replaced.
Replacing Wear Parts
If you do not replace the wearing parts in time, their excessive wear will adversely affect the other parts of the chainsaw. In particular, if you do not change the tire and the drive sprocket in time, increased vibration will adversely affect the crankshaft bearings. The maximum depth of the tooth teeth should be 0.5 mm. In practice, sprockets are often operated up to a wear depth of 1 mm or more. not suspecting that this leads to an increased load on the crankshaft bearings and their accelerated failure. When 3-4 chains are worn, it is necessary to change the tire itself, by this time its wear reaches its limit values.
The chainsaw tire wears out especially in the area most often cut, usually. this is the underside of the guide rail. For uniform wear, each time the chain is replaced, the tire must be turned 180 ° relative to the horizontal axis.
When installing a new chain, a new drive sprocket should be installed. Since under normal load the service life of the drive sprocket is twice as long as the service life of the chain, it is advisable to use one sprocket for alternating operation of two chains. The main malfunctions of chainsaws and their repair do it yourself. Thanks to this, the sprocket and chains wear out almost simultaneously. If a new chain is placed on a worn sprocket, then the leading chain links wear out much faster. For cost-effective operation of the chainsaw, always spend together: one guide bar, two chain sprockets, four saw chains.