For an independent carburetor option, it is necessary to familiarize yourself with its device and understand the order of work that is carried out to adjust the parts responsible for the correct functioning of the component parts of the device and parts close to it.
It is necessary to carefully handle the items for the system option, and also to determine whether the set characteristics correspond to very permissible values.
The carburetor serves to mix the combustible consistency with air, while observing the proportions established in advance. If clear doses are not followed, the proper functioning of the motor is at risk. When a huge amount of air enters during mixing of a component, and there is not enough fuel, then such a mixture is considered "poor".
Over-saturation should not be allowed, because with a large amount of fuel, compared to air, malfunctions or engine wear are also likely. Adjustment of the carburetor is needed not only before the initial introduction, but also when any differences in its operation are revealed. Before using your 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:
Looking for models that are cheaper, but reliable and time-tested? Pay attention to Russian-made chainsaws.
Alternatively, research foreign chainsaw manufacturers such as Calm.
Every carburetor owner should have the necessary tools to adjust this system. Champion 142, characteristics, purpose and operating instructions. Champion 142 carburetor adjustment. There are three adjusting screws that are located on the body of the device. They have their own markings:
To carry out a safe repair, you need to prepare a flat surface where you can carefully position the device, and turn the chain in the opposite direction. Saw champion 137 with equal chainsaw champion model 137-16 carburetor adjustment. We need a tachometer. It determines the presence of a malfunction in the carburetor. When the screws are turning, the sound should be perfect and absolutely smooth. If you notice squealing notes, then the mixture is oversaturated.
Carburetor adjustment is divided into two main steps. The first is called basic. It is performed with the engine running. The second is performed when the engine is warm.
The adjusting screws of the highest and lowest speed should be moved clockwise until the highest resistance is encountered. When the screws reach the stop, you need to move them in the opposite direction and leave them after 1.5 turns.
VIDEO
Video review chainsaw Champion 137 -16 Buy at.
The engine turns on at medium speed and warms up like this for about 10 minutes. The idle speed screw must move clockwise. It is released only when the engine comes into stable operation. It is necessary to check that the chain does not move during this process.
In idle mode, the engine may stall (the reason is here). In this case, immediately turn the adjusting screw clockwise until it stops. Sometimes the chain starts to move. In this case, turn the adjusting screw in the opposite direction.
A little research needs to be done. Device acceleration is initiated. The serviceability of the engine should be assessed during the maximum revolutions. When the engine is functioning properly it means when the accelerator is pressed, the speed rises rapidly to 15,000 rpm.
If this does not happen or the increase in speed is too slow, you must use the screw marked with the letter L. It turns counterclockwise. Adjusting the carburetor partner 351. The partner 351 chainsaw contains units among its modules. Moderate movements must be observed, since the turn cannot be more than 1/8 of a full circle.
To limit this value, you need to use the screw marked H. To increase the number of revolutions, turn it clockwise, and to decrease them in the opposite direction. The maximum frequency should not exceed 15000 rpm.
If you increase this indicator, the engine of the device will work for wear, which will lead to problems in the ignition system. When turning this screw, you must take into account the ignition processes of the device. If the slightest glitches appear, then the maximum value of the revolutions must be reduced.
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 functioning of the device in idle cold mode. When the correct parameters are achieved during the adjustment, you can see the exact conformity of the carburetor design to the following criteria:
When the idle cold mode is connected, the chain does not move.
When the accelerator is pressed even slightly, the engine revs up at an accelerated pace. With a gradual deepening of the pressure, you will notice that the engine speed increases commensurately, reaching the maximum allowable values.
When the engine is running, you can compare its sound to a four-stroke instrument.
If violations are noticed in the above parameters or the device was not completely 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.
The device of different models of carburetors is almost the same, so when working with them, you can use the standard scheme. All elements must be removed carefully, and then lay out in the order below so that you can successfully place the items in place after the completion of the repair work.
The chainsaw is a worthy replacement for hand saws and axes. Today, this tool is available in almost every household - it is indispensable for setting up a personal plot, construction and repair work. Intensive use and improper care of the tool can lead to premature failure. However, the owner of the chainsaw does not have to go to the workshop right away - many of the faults that can happen to her during operation are quite realistic to eliminate on their own.
Correct diagnosis is essential for a successful repair. Therefore, in order to determine why the chainsaw failed and, most importantly, how to make it work again, you first need to know the features of its design.
It should be noted that it does not differ in particular complexity, since it includes:
engine (two-stroke gasoline);
functional part (saw bar and chain);
systems that ensure the joint operation of these two units (ignition, filtration, lubrication, etc.), that is, the tool as a whole.
In order to simplify the diagnosis of malfunctions, it is customary to distinguish them into two main categories:
engine malfunctions;
malfunctions of other parts of the chainsaw.
Most often, failures occur in the engine systems, however, the rest of the tool, due to intensive use or improper care, can fail at any time. How to determine exactly where the breakdown occurred? Simple logic will help us with this.
If the problem is in the engine, it will:
do not start;
deafen;
work unstable;
overheat;
smoke;
develop insufficient power.
As for all other malfunctions, as a rule, they manifest themselves with a normally operating motor.
If your chainsaw won't start, the first thing to do is to check for a mixture of fuel in the tank. By the way, it must be prepared in the proportions indicated by the engine manufacturer, otherwise the instrument will simply not start.
After verifying that the fuel mixture is correct and available, the ignition system should be checked. To do this, you need to inspect the spark plug.
Her condition can say a lot:
indicates that the fuel mixture does not enter the carburetor, which means that the problem is not in the ignition;
is the result of an overabundance of the fuel mixture, which lies either in a violation of the engine starting algorithm, or in an incorrect carburetor adjustment;
this is a signal about the presence of low-quality oil in the engine lubrication system, incorrect carburetor settings, or an incorrectly prepared fuel mixture.
If the spark plug is splashed with fuel, wipe it thoroughly after removing it. The fuel supply system should also be cleaned. To do this, it overlaps, after which the starter is turned on. A carbonized candle must be carefully cleaned with an awl and emery.
When checking the spark plugs, you should pay attention to the distance between the electrodes (the normal gap is 0.5-0.65 mm), as well as the condition of the gasket and the presence of a spark. A damaged or worn gasket will have to be replaced, and the spark can be checked by putting on the ignition cable, connecting the cylinder and plug nut, and starting the starter.
If the discharge does not occur, the plug must be replaced. In the event that a spark does not appear with a new candle, then the problem is in the connection to the high-voltage wire or in it itself.
If the fuel mixture does not flow into the cylinder, but the spark plug is working properly, this may mean that:
Clogged fuel filter.
To clean this unit, remove the fuel hose and check the jet. If it is weak, the filter must be removed through the filler hole of the fuel tank and cleaned or replaced if completely worn out.
As a preventive measure, it is recommended to replace the fuel filter at least once every 3 months.
This is nothing more than a hole in the fuel tank cap, which is cleaned out with an awl.
The fuel mixture is not supplied or is supplied insufficiently.
There may be several reasons for this:
the air filter is clogged (in this case, it must be removed, rinsed with water, dried and replaced);
the carburetor settings are out of order (which means this unit needs to be re-adjusted);
the integrity of the carburetor membrane is broken (must be replaced);
the channels of the carburetor are clogged (it must be disassembled and all parts and assemblies must be cleaned).
If at low speeds the engine of the chainsaw works normally, but at high speeds it starts to stall and smoke, the problem may be hidden in the muffler.
To check the quality of its work, you should do:
dismantling (with the obligatory closing of the outlet);
disassembly (if the muffler is collapsible);
cleaning from carbon deposits using special detergents or dry method;
drying (using a hair dryer);
reassembly and assembly.
Dry cleaning without respiratory protection is not recommended. The carcinogens present in the soot will be released into the surrounding atmosphere in the form of dust, the inhalation of which is extremely hazardous to health.
To prevent clogging of the muffler during the operation of the chainsaw, you should carefully monitor the composition of the fuel mixture and the quality of its components.
If the chainsaw engine does not start or cannot develop normal power, it is likely that sufficient pressure does not build up in the engine cylinder for combustion of the fuel mixture. The reason for this may be the wear of the elements of the cylinder-piston group - the piston, rings, bearings, etc. In order to assess the condition of this unit, it should be visually inspected, having previously removed the muffler.
For a more complete diagnosis, a compression gauge is placed in the spark plug hole of the two-stroke engine of the chainsaw. It measures the compression in the engine. Based on the results of the check, one can judge the state of the CPG, however, the exact facts can only be obtained with a complete disassembly of the unit.
If the piston is chipped or scratched, it will obviously need to be replaced. The same applies to deformed or broken piston rings - for normal engine operation, they must be completely intact and free of carbon deposits.
A properly working carburetor guarantees maximum efficiency of the chainsaw, that is, it is possible to develop full power with the most economical consumption of the fuel mixture. The adjustment of this unit is usually carried out by the manufacturer, but its design provides for the possibility of adjustment already during operation.
The fact that such a setting will have to be performed by the owner of the chainsaw is evidenced by:
Strong vibrations or damage to the protective cover.
CPG wear.
Carburettor clogged.
Inability to start the engine or its spontaneous stops after starting.
Increase in fuel consumption and emissions while decreasing engine power.
Chainsaw carburetor adjustment is carried out in strict accordance with the manufacturer's instructions using three special screws, which are responsible for the maximum ("M") and minimum ("L") revolutions, as well as the idle speed of the engine ("T"). In order to exclude unwanted interference by an inexperienced user with the carburetor operation, some manufacturers install only one idle screw.
Carburetor adjustment is carried out in two stages:
Basic (carried out with the engine off).
Finishing (carried out with a running, pre-warmed engine).
For basic adjustment, screw in screws H and L as far as the stop and back out 1.5 turns. Final adjustments require the engine to warm up for 5-10 minutes at low revs.
The final calibration is performed by unscrewing the idle screw until the minimum engine speed is reached (in this case, its operation must be stable, and the chain must be stationary). If the engine stops at idle speed, the screw must be returned back, and if the saw chain is still in motion, continue turning counterclockwise.
Calibration check is performed by test:
Acceleration (with a smooth press on the accelerator, the engine should quickly pick up speed to the maximum indicator).
Maximum speed (if there is an ignition interruption, screw H should be slightly loosened).
Work at idle speed (the chain should not move, and the engine should pick up speed as quickly as possible).
If the owner of the chainsaw is not familiar with the carburetor device and does not have the tool necessary to calibrate it, contact a specialist. The carburetor is a very complex unit, so any wrong action can lead to irreversible consequences, for example, complete engine failure.
If the diagnostics showed that everything is in order with the engine and its systems, then the cause of the malfunction should be looked for in other units of the chainsaw. The most common problems are:
failure of the starter;
improper operation of the lubrication system;
incorrect operation of the chain brake;
saw chain wear, etc.
If the cause of the tool failure is not visible to the naked eye, as is the case with the engine, it is necessary to perform a thorough diagnosis of the faults and eliminate them in accordance with the manufacturer's recommendations and safety regulations.
VIDEO
A significant share of imported chainsaw equipment is made up of models of the budget assortment. Among others, this category is represented by the inexpensive, easy-to-maintain and easy-to-use Champion 137-16 chainsaw.
Numerous reviews of users and specialists of service and repair services confirm the compliance of the product with consumer requirements and regulations of the current industrial standards.
The tool belongs to the class of household appliances, but in some parameters it is as close as possible to semi-professional standards. Its technical and operational characteristics make it possible to effectively mechanize most of the household, sawing and woodworking works of various levels of complexity.
The operational capabilities of the model are expanded due to the configuration of a sufficiently powerful power unit, the use of a centrifugal clutch with minimal torque losses and an economical diaphragm carburetor.
The advantages of the saw:
combination of modern industrial design with case ergonomics and excellent balance;
performance optimal for its class;
economical fuel consumption;
high maintainability allowing you to perform simple repairs with your own hands.
Consumables and spare parts available at a cost are present in a fairly wide range that allows you to restore the performance of a worn-out unit or component system by almost 100%.
Saw Champion 137 with equal success copes with transverse and longitudinal-diagonal sawing of wood with a diameter of up to 300-350 mm, which determines its suitability for felling small trees, harvesting firewood, pre-assembly preparation of log and bar construction materials.
The comfort of work is promoted by:
relatively low weight of the tool;
convenient body shape and handle configuration;
efficient operation of the vibration damper and low background noise.
The safety of sawing work is ensured by a reliable blocking of the chain movement, which is triggered in the event of emergency situations.
The tool's own weight of 4.5 kg is partially offset by good balance, comfortable grip and well-positioned controls.
Chainsaw Champion model 137-16 is equipped with a high-speed carburetor internal combustion engine that uses gasoline and special motor oil in a ratio of 25: 1 as fuel. The engine with a working volume of 37.2 cm3 at maximum speed develops a power of 2.1 hp.
The fuel mixture enters the carburetor from a 310 ml gas tank located in the housing. A manual starter is used to start the power unit, a quick start, regardless of external factors, is provided by a primer pump, a properly tuned carburetor and an electronic ignition system.
A factory-set fuel system setting brings the power unit to the operating mode with maximum traction properties and economical fuel consumption.
The need to adjust it arises when transferring the tool to winter or summer operation, refueling the saw with fuel with a different octane number.
If the engine starts poorly or does not develop the required power, the recommendations of the instructions for use will help to adjust the fuel system.
The carburetor is adjusted after cleaning the air intake and warming up the engine to operating temperature.
Confirmation of the correctness of the adjustment is a fast set of revolutions, the absence of "dips" with a sharp gas supply and the stability of idling.
The price of unskilled intervention in the operation of the carburetor is a deterioration in the traction characteristics of the engine, a significant excessive consumption of fuel.
The description also contains information on the sequence of preparing the saw for operation, routine maintenance of components and assemblies, tips for finding and eliminating possible failures and malfunctions.
VIDEO
The saw blade assembly consists of a 16 "steel guide bar and a proprietary cutting chain with a standard 3/8" pitch, which differs from similar models with increased smoothness.
As replacement equipment, brand kits of the same or smaller size can be used, corresponding to the features of the forthcoming work.
Automatic supply of lubricant to the working area prevents overheating of the chain and its forced wear. Special chain oil is supplied to the pump from a 210 ml oil tank located inside the saw body.
The design of the tool provides easy access to the chain tensioning mechanism.
The safety of the operator is ensured by the presence of an inertial emergency stop brake and a safety device to block the broken chain. The devices minimize the risk of injury to the operator when the tool is thrown, the chain comes off the bar, or in any other untoward situation.
The tool is characterized by:
affordable cost for a wide range of owners of private and small farms;
simple and time-saving maintenance;
compliance with the requirements that apply to household gasoline-powered appliances of small and medium power range;
the advantages of this model are versatility, sufficient performance, economical maintenance and stability of performance.
In the design of the product, modern design and technical solutions were used to ensure the full development of the assigned resource.
Even a cursory analysis of consumer reviews shows that the number of documented failures and malfunctions of the Champion 137-16 saw is minimal. Until now, the strength of the spring and the case of the manual starter has not been increased, there are complaints about the operation of the chain lubrication system.
VIDEO
The minimum fixed cost of this model is 4900 rubles, the maximum is 6450 rubles. There are few offers for the sale of used analogs; new spare parts sold by hand are still in demand.
Many leading manufacturers specialize in the production of small and medium-sized household chainsaws. Popular models are presented on the domestic market - Hyundai X 360, Partner P340S-14, CubCadet CC 1936, AL-KO BKS 4040 and a number of other budget-class developments.
The Champion with a 16-inch tire, purchased for a one-time operation, became a worthy addition to a set of household tools. It was not without childhood illnesses, but after a partial bulkhead and adjustment, the car reached a working level. The budgetary cost of the saw may affect its durability, but for two years of operation, nothing has changed except for the chains. The plastic of the starter is really weak, but if the cord is not pulled, but pulled with a slight acceleration, this mechanism can last long enough.
The moderate engine power of the Champion 137 chainsaw is compensated by the correct and timely sharpening of a calm or any other branded chain. The engine does not heat up on high-quality oil even in the July heat.
Even professional chainsaws from world famous manufacturers break down - no one is immune from this. The question is how often breakdowns occur and how serious they are. It is one thing when you need to sharpen the chain or replace the drive sprocket, and it is another thing if the chainsaw does not start or fires at the carburetor. In fact, most of the faults can be easily eliminated with your own hands, for example, when the chainsaw does not lubricate the chain or stalls.
If there are difficulties with starting a chainsaw, many immediately sin on the carburetor. In fact, there are several options and the cause of the malfunction can be any:
Clogged air and / or fuel filters. The problem is solved by cleaning the filters.
Lack of fuel in the tank. Yes, there is such a reason - some owners forget about such an insignificant detail as refueling a chainsaw and think that a couple of liters of gasoline will last for six months. In addition, the fuel in the tank should not be stored for more than 14 days, because gasoline evaporates and the octane number is lost.
Check the pipe from the fuel tank to the carburetor - it could be clogged or cut off, so gasoline does not enter the tank.
No spark on spark plug. Why there is no spark - there can be many reasons: there is no contact, you need to change the candle or it is flooded. Why he pours a candle on a chainsaw is another question. But if this happens, you need to dry and reinstall, and then check for a spark. If the spark plug is heavily soaked, it is recommended to replace it.
Check muffler for carbon deposits. If there is carbon deposits, thoroughly clean the muffler, but it is still recommended to take the chainsaw to a service center to check the cylinder and piston there, because carbon deposits are a sure sign of improper operation of precisely the elements of the cylinder-piston group.
The carburetor is clogged. How to properly adjust the chainsaw so that the carburetor works well is discussed in a separate article.
If none of the above methods helped, then the reason is more serious - the breakdown of one of the nodes of the connecting rod-piston group.In this case, it is recommended to take the chainsaw to a service center.
VIDEO
The engine starts, but at idle or under load the chainsaw stalls. In this case, most often you should perform the same actions as described above.
The fuel mixture is not prepared correctly, there is too much oil in it, so the octane number of gasoline is less than it should be, so the chainsaw only works on suction or immediately stalls.
Spark plug carbon deposits or improper spark plug-to-wire gap.
The muffler is clogged. It is necessary to remove carbon deposits.
Lost carburetor settings. Idling adjustment is required on the chainsaw. It is carried out using the adjusting bolts marked L and H. How to adjust the idle speed, see the article on adjusting the carburetor.
Clogged air or fuel filter. The seals need to be cleaned and checked.
The breather is clogged and because of this, fuel does not flow and the gasoline pumping on the chainsaw does not work. Take the needle and carefully clean the breather.
Fuel pump malfunction. Remove the pump and check if gasoline is oozing out of it. If oozing, replace the gasket or the pump itself.
Clogged air filter. It is necessary to take out the filter, clean it well or even rinse it, dry it and reinstall it.
Incorrect proportion of oil / gasoline mixture. Drain the fuel and remix the correct proportion of oil and gasoline.
If during operation there are extraneous sounds similar to shots, then there is a problem with the muffler or carburetor. How do I keep my chainsaw quiet? It depends on which node the fault is in.
Ignition too late - the air-fuel mixture does not have time to burn out in the cylinder, so a sound that looks like a small explosion is obtained.
Lean air-fuel mixture. Too little gasoline enters the mixture - adjustment of the chainsaw, or rather the jets, is required in order to increase the fuel supply. Why the chainsaw thrusts itself - for the same reason.
Enriched air-fuel mixture. Why does the chainsaw “shoot”? There is too much gasoline and too little air in the mixture, so the mixture does not completely burn out in the chamber and partially burns out in the muffler. Exhaust carbon is a clear sign of this. Air filter cleaning or carburetor adjustment required.
Why does the chainsaw get hot? An engine or a tire can warm up - in any case, a small amount of lubricant is to blame.
Overheating of the engine. Incorrect proportion of the fuel mixture or pure gasoline in general. Drain the fuel and mix with the correct proportions of oil and gasoline as indicated by the manufacturer.
Overheating of the tire. It is necessary to clean or adjust the oil pump, because no oil is supplied to the tire.
The decrease in the performance of the chainsaw is associated with the bluntness of the chain teeth. This is the most common problem because sharpening should be done regularly. How to do this using a machine, file or grinder, read the corresponding article.
When sawing, you will notice that the cut is uneven. Why does the chainsaw cut crooked? There are several reasons:
Incorrect chain sharpening. The teeth are sharpened at the wrong angle or in one direction only. Correct sharpening required.
Incorrectly matched chain. At very high revs, the difference even of 0.2-0.3 mm between the width of the groove or the width of the landing will be visible, which is why the chainsaw cuts to the side. A suitable circuit must be installed.
Uneven tire wear. Over time, the tire wears out on one side and then the chain is pulled to the side. Flip the tire regularly so that the wear is even on both sides. If the wear is too great, replace the tire.
For proper operation, the chain must be constantly lubricated to reduce friction between the bar and the links and to prevent premature link wear.
If the chain is not lubricated on the chainsaw, then there is a problem with the oil pump - oil is not supplied due to a clogged channel. Lack of lubrication is the reason why the chain stretches or why the chain breaks. Clean the channels, the smallest particles of shavings constantly get there and clog them. May also cut off the oil hose. If you need to adjust the oil pump of the chainsaw or repair it, it is better to contact the service.
Splashes oil from the chain. Incorrectly selected lubricant - it is too liquid, therefore it does not so much lubricate the links as splashes on the wood. Replaces the grease with a thicker one.
Why does the chain fly off the tire? There may be several reasons and they are all different:
Drive or driven sprocket is worn. Due to the fact that the sprocket is worn out, the adhesion to the chain decreases, which is why the chain flies off the chainsaw. Sprocket replacement required.
The chain has stretched out. Why does the chain stretch on a chainsaw - due to insufficient lubrication. The metal heats up and stretches, albeit by a fraction of a millimeter, but if you take into account the number of links, then even 3-4 mm is enough for the chain to fly off the tire. The chain needs to be changed.
The chain tensioner, which regulates its tension, is loosened. how to adjust the chainsaw, or rather the chain tension? You need to adjust the tensioner - this can be done in just a few minutes.
Why does the chain of the chainsaw not rotate when the engine is running even at full speed?
Leading asterisk. Either it is jammed, or the crown is worn out so much that it does not engage and the chain does not spin on the chainsaw. In any case, it is necessary to disassemble the sprocket in order to find out the exact reason why the chain does not spin. If the crown is worn out, it is necessary to replace the sprocket (or the crown itself, if the sprocket has a prefabricated structure).
The chain brake is jammed. As a result, the sprocket is blocked by the brake mechanism, while the motor runs. Stop the engine and release the brake. If this happened under load, the brake mechanism will have to be changed, as well as the sprocket, because high temperatures can melt and overheat many elements.
All chainsaws are equipped with a main and inertial (emergency) brake. The latter turns on only when a kickback occurs. The main brake is designed to stop the chain when the engine is running. Why does it grip the chain on the chainsaw and it doesn't stop? There are two options:
The brake band is badly worn and does not provide sufficient stopping effect. The brake band needs to be replaced.
Contamination of the tape. When working, debris can be clogged in the undercover space: shavings, sawdust, dirt, etc. Debris is blocking the brake, so if the brake fails, clean the brake.
It would seem, why does a chainsaw need a summer resident who grows vegetables and fruits, or the owner of a country house who has a small garden and several flower beds? The question disappears when there is a desire to build a bathhouse, update a greenhouse, topple an old business, or just make a bench for relaxation. Unfortunately, any mechanism periodically needs preventive maintenance and replacement of spare parts, and for this you need to be well versed in the device of the product, besides, repairing the chainsaw with your own hands will save time and money.
All chainsaws are similar in structure, regardless of whether they are European (ECHO, Stihl, Husqvarna) or domestic (Kedr, Ural). The main elements are located inside the body - the fuel tank and the engine, and outside the starter, the handle, the saw part (tire) with the chain. A sharp jerk in the cable starts the engine, which starts the saw blade.
To begin with, we suggest that you familiarize yourself with the video clips that show how the chainsaw works and how it works:
From time to time, the saw malfunctions, which require disassembly to eliminate. What can happen to such a simple mechanism as a chainsaw? At least the following:
Stops getting started;
Starts up, but soon stops;
Ceases to function in the cut;
Loses its power;
Most of the malfunctions are associated either with interruptions in the operation of the engine (fuel supply system, exhaust system, ignition, cylinder-piston part), or with malfunctions of other systems and assemblies (clutch, chain brake, tire, lubrication system). Let's consider the most common breakdowns and techniques for their elimination.
A serviceable chainsaw starts with one jerk and does not fail in the cut
The first thing to do if a chainsaw breaks down is to inspect the spark plug by disconnecting the wire and carefully unscrewing it with a special key.
Components of the chainsaw ignition system: 1 - flywheel with magnets, 2 - ignition module, 3 - spark plug, 4 - high voltage wire
Unscrew the spark plug to check its condition.
Her appearance says a lot:
Dry. Most likely, the fuel mixture does not enter the cylinder. It's not about the ignition system, so the plug is screwed back in.Strongly splashed with fuel. The reason for the excess fuel mixture lies either in the violation of the starting rules, or in the incorrect adjustment of the carburetor. Carefully wipe the spark plug, shut off the fuel supply and turn on the starter to remove excess fuel and ventilate the combustion chamber. Then the candle is put in place and the mechanism is started again.Covered with black carbon. This may indicate the use of low-quality oil, an incorrectly adjusted carburetor, or an incorrectly calculated gasoline to oil ratio. The candle should be washed, cleaned of carbon deposits with a sharp object (awl or needle), wipe the electrodes with a sandpaper and put in place.When checking the candle, you need to pay attention to the gap between the electrodes: it is considered normal from 0.5 to 0.65 mm. A damaged or worn gasket must be replaced.
A large amount of black carbon on the spark plug indicates a malfunction of the engine.
To be sure, you should also check for a spark. To do this, put the ignition cable on the spark plug, connect the plug nut and the cylinder with pliers, start the starter and watch for the spark. If it is missing, the plug must be replaced. If the new spark plug also does not emit sparks, the problem is in the high-voltage wire or in the broken connection with the spark plug.
Fuel may not enter the cylinder for the following reasons:
Dirty fuel filter. Remove the fuel hose and check how the fuel flows. If the jet is weak, the filter may need to be cleaned. It is taken out through the filler hole of the fuel tank and cleaned; in case of severe contamination, it is replaced with a new one. As a preventive measure, it is recommended to replace the fuel filter every three months.Clogged breather (holes in the fuel tank cap). It is also checked by disconnecting the hose, in case of blockage, clean it with a needle.Lack or insufficient amount of fuel. There may be several reasons for the malfunction. The first reason is a clogged air filter. Air ceases to flow into the carburetor in the required amount, in this regard, due to a too rich fuel mixture, engine operation is disrupted. The contaminated filter is carefully removed, cleaned and washed in water, then dried and reinstalled.Another reason is improper adjustment of the carburetor. The adjustment is made with three screws.
Timely replacement of the fuel filter ensures full fuel supply
The fuel hose and choke actuator must fit snugly on the fittings
The throttle lever cable must be in place
During work, you must use the instructions, otherwise you can only make it worse.
And the last reason is a violation of the integrity of the membrane or clogging of the carburetor channels.
To repair the carburetor yourself, you need to get acquainted with all its parts.
All parts must be clean, dry and in good condition.
If the engine works fine at low speeds, and at high speeds it starts to stall, the reason may lie in the spark arrester of the muffler, clogged with combustion products.
remove the muffler;
disassemble (there are also non-separable models);
remove carbon deposits using detergents;
dry with a hairdryer;
install in place.
Dry cleaning is unacceptable, as the soot contains carcinogens, the inhalation of which is hazardous to health. After removing the muffler, cover the outlet with a clean cloth.
Interruptions in the operation of the chainsaw signal a possible clogging of the muffler
To avoid clogging of the muffler, it is necessary to monitor the composition of the fuel mixture. The amount of oil should not exceed the rates recommended by the manufacturer. Poor oil quality also negatively affects engine performance.
Often the engine will not start or run at full capacity due to low cylinder pressure. It can be caused by piston or cylinder wear, piston ring sinking, bearing wear. You can partially examine the state of the cylinder-piston group (CPG) by removing the muffler and looking into the opened hole.
A compressor placed in the plug hole will help to measure the compression in the engine - according to the measurement results, you can also talk about the state of the CPG. Accurate data is obtained only after complete disassembly of the mechanism. If the piston is chipped or scratched, it must be replaced. The piston ring must be clean, free of carbon deposits, and be exactly in place.
Piston and crank mechanism wear is considered a serious problem.
According to the results of measuring the compression, one can judge the condition of the parts of the CPG
Let's consider three main faults:
Oil leakage. Check that the pipes are tightly connected to the pump unions and that they are not cracked. Problem tubes are sealed with sealant or replaced.
Insufficient oil supply. Most likely, the lubrication passages are clogged.
Cracks in the oil pump housing. Part needs to be replaced.
Here's how to diagnose the lubrication system:
The chain brake often does not work due to clogging of grease or sawdust in the brake band and the space under the cover. All parts should be cleaned from blockages. Perhaps the tape is simply worn out, then it needs to be replaced.
The chain brake is restored by mechanical cleaning
Video (click to play).
Some parts of a chainsaw will wear out faster than others. These include the drive sprocket, bar, chain, anti-vibration elements. For quick replacement, it is best to always have spare parts on hand. Sharpening the chain should not be neglected.
