Grass trimmer ignition. spare parts in the online store “Benzo Zip
Grass trimmer ignition is one of the important elements in a similar system to a gasoline grass trimmer, which triggers an electric spark that ignites the fuel and drives the entire mechanism. This module gives a peculiar impetus. The entire system consists directly of the ignition (or magneto) and the flywheel. The last element for the gasoline grass trimmer is an aluminum part, it also serves as a fan. It has blades that distribute the air flow. the part cools the engine. Installed two plastic “dogs” with springs are designed to clutch the manual starter.
How to remove hand wheel on Brother PQ1500SL. Thread wound around hand wheel
The second part, which you can buy right now on the pages of “Benzo Zip” store. is, directly, the ignition. It generates voltage and transmits to the spark. It consists of the coil, the high-voltage wire, the tip on the spark plug, and the wire to connect the engine. The part can have different shapes, so when choosing a new element, pay attention to this characteristic, as well as the type of attachment and the distance between the fixing elements.
How to correctly set the ignition on the trimmer: adjusting the gap between the magneto and the flywheel
Gasoline trimmers use both two-stroke internal combustion engines (ICE) and four-stroke engines. But the ignition system in them does not differ from each other, so the repair and adjustment of this fuel ignition system will be the same for different types of engines.
How the ignition system on the trimmer functions
The ignition system of a two-stroke combustion engine consists of 2 elements: the flywheel and the coil (magneto). The illustration below shows what they look like.
On the flywheel is an impeller that works as a fan to cool the engine. There are also permanent magnets on one side of the flywheel, shown with an arrow in the picture.
As the flywheel rotates, an electric current is produced in the coil, which serves to produce a spark on the spark plug. The spark appears at the moment when the magnets are directly under the magneto.
Why do you need to adjust the ignition
In some cases, when the engine does not start, you will need to adjust the ignition. Of course, you must first check that the spark plug, and the high-voltage cable and cap, are in good condition.
Adjust the ignition on a two-stroke engine is needed to ensure timely ignition of fuel in the engine combustion chamber. Here is a diagram, from which you can understand the internal combustion engine principle.
The spark in the spark plug should appear at the moment of compression of the fuel by the piston, when it does not reach the top dead center (TDC) just a little bit. When the piston passes TDC, the fuel mixture ignites, and the piston moves downwards as a result of the explosive energy.
therefore, if for any reason (mainly due to displacement of the flywheel on the shaft relative to its original position) fuel ignition occurs before the piston passes TDC, it goes back and the crankshaft is cranked in the opposite direction. Such a move can damage the starter assembly, break the starter cord, etc.д. In this case there is an early ignition of fuel.
There can also be late ignition on the trimmer: The piston goes down after compression of fuel that has not ignited, and at that moment there is a spark. In this case, the engine will either not start or will lose power significantly and will not pick up speed well.
But such problems with early or late ignition on two-stroke engines are quite rare, because the flywheel with magnets is already set in the correct position, which is perfectly synchronized with the movement of the piston. In addition, the flywheel is fixed to the shaft with a key and a nut. Therefore, improper installation of the part is ruled out.
Basically, the ignition adjustment consists of setting the correct gap between the magneto and the flywheel.
How to check if a magneto is working properly
The magneto is the main part in the engine ignition system and is a coil with primary and secondary windings arranged around the core. Often due to a faulty magneto the spark is lost on the spark plug, and the fuel does not ignite. To check the coil, you will need to use a tester, and perform the following steps.
- Set the tester, having switched to the resistance measurement mode, to 200 Ohm. The primary winding will be checked this way.
- Connect one electrode of the tester to the coil’s “ground” and the other to a contact exiting the magneto. Normally, resistance should be between 0.4 and 2 ohms.
- To check the secondary winding you need to set the switch of the device to 20 ohms. Then, one probe of the device is inserted into the cap of the spark plug and the other is connected to the “ground”. In the normal range, the resistance readings should be in the range of 4 to 6 ohms and higher (it depends on the model).
If the circuit is open, the device will show infinity, but if the circuit is shorted it will show 0 (zero).
If you do not have a tester, you can use the following method, being very careful not to let the electrode touch the cylinder, otherwise the coil will burn out.
- Remove the cap from the spark plug. It is not necessary to unscrew the spark plug to keep the compression.
- A nail without a cap should be inserted in the cap. The nail must be large enough to hold well in the cap.
- Tie the cap and nail to the cylinder using dielectric so that the clearance between the electrode and the cylinder housing is between 5.5 and 7 mm (but in no case touching the “mass”).
- Repeatedly test the engine with the starter to simulate starting. The ignition button must be turned on.
- Observe if the spark appears and what color it is.
The spark should be strong, white or with a bluish tint. If the spark is weak and its color is orange or yellow, it indicates a defective magneto.
Also consider the fact that sometimes the magneto in a cold state can give a good spark. But after heating due to internal malfunctions, it stops producing current. As soon as the coil cools down, the grass trimmer starts up again and runs for a while until the magneto warms up again. Such a coil needs to be replaced.
Sometimes a similar heating problem can be caused by the spark plug, even if the coil is serviceable, so you need to check both parts.
Algorithm of ignition adjustment
The ignition on the trimmer is quite simple to adjust.
Remove the cover from the engine by unscrewing all the screws that hold it in place. For example, on the Patriot (Patriot) PT 2540 chain saw, to remove the cover, you will need to unscrew the air filter housing, and with a flat screwdriver remove it from the latches. After that, the plastic housing is easy to remove.
What’s the gap on the lawnmower ignition
We often encounter situations where users have a faulty ignition. Often it does turn out to be faulty, but often the ignition coil has nothing to do with the failure of the tool. Follow the steps below to check the ignition coil for proper operation.
Evaluate the current condition of the coil.
Before working on the ignition coil, it is worth checking that the entire circuit. Perform the following steps:
- Visually inspect the coil body for cracks and visible defects
- Contamination of conductive elements and assemblies
- the serviceability and insulation of the high-voltage wires, the contacts of the wires, the reliability of their fastening, the absence of rust in the places of fastening
- of the spark plug: it often disconnects from the high-voltage wire and tries to repair it with improvised methods. Remember: Any snot in this area reduces the quality of the electric arc of the candle
- Check that the spark plug is in good condition. The quality of our gasoline does not allow the spark plug to live long,
- check the serviceability of the circuit breaker. This is especially important with Chinese saws and trimmers.
The meaning of these actions is to exclude from the list of possible failures all elements of the circuit, except for the coil. If everything is fine, we move on.
Ignition!Set clearance on chain saw. In one minute.
Allows you to correctly determine when the ignition module needs to be disassembled and replaced
Why a good spark is needed.
The quality of the spark determines its ability to ignite a properly formed air/fuel mixture under operating conditions. A weak spark under conditions of high pressure and temperature in the combustion chamber cannot do this. Ignition is late or does not ignite at all. There is irregularity in the engine, the engine. There is vibration, detonation, the starter may have a backfire effect.
The insidiousness of such a breakdown is that the following diagnosis does not give one hundred percent confidence in the effectiveness of the ignition coil. This kind of implicit breakdown, when there is a spark, but it’s not quite right, is often misleading and causes you to write off ignition coil problems as a carburetor malfunction. Typical actions in such cases. is to increase the fuel supply. Turns out the spark can ignite such a spark, but the right one doesn’t have it. But the use of an enriched mixture leads to rapid wear of the cylinder-piston group and the muffler. Therefore, in such questionable situations, once again check both the carburetor and the ignition coil.
Checking the ignition coil.
In order to avoid possible malfunctions on the wiring side and on the switch-off buttons, you can disconnect the control wires from the coil for the duration of the test.
- Measuring the coil resistance. This method is not always applicable: first, you need to know the resistance parameters of the coil. Secondly, the ignition, in addition to the inductor, contains semiconductor elements to form the desired high-voltage pulse. So when you try to call the mag through the high voltage and negative wire, we get either a Chain break indication or a huge resistance. If the circuit is still ringing, this is likely a sign of malfunction.
- Using a device that checks the spark. It is mounted in an open circuit between the spark plug and the high voltage ignition coil. The device is expensive and used mostly in serious service centers.
- With a spark plug. Unscrew the spark plug and reattach its housing to the cylinder. Pull the starter and observe the spark between the contacts. This method is approximate and does not give a complete picture of the condition of the ignition coil, since the spark plug is not under pressure and the flywheel will spin faster due to lack of compression in the engine (spark plug turned out )
- The Barbaric Way. It is used at your own peril and risk in desperate situations.
- Remove the cap from the spark plug and put a nail in it. Be careful not to damage the inside of the cap. then put it on the spark plug and operate it. The hat in the nail better bite off. Otherwise it may be difficult to remove it.
- place the nail 6-7 mm out of the cylinder.
- Start the engine, i.e. follow the normal factory steps. It will make the ignition system work. Note that the spark plug must be screwed into the spark plug hole.
- Look at the presence and color of the spark. Ideally, the spark should be strong and bright blue. Anything else is a sign of malfunction.
- Important points:
The spark plug cannot be twisted: no amount of compression will cause the flywheel to rotate faster, which will not match the actual operating conditions
If there are electronic components in the ignition system, this method may disable them
The distance between the nail and the cylinder simulates the compression and dielectric properties of the fuel mixture. The 6-7 mm distance is approximate and may vary for different product models.
Fashion philosophy: there should be a large gap between the nail and the cylinder, the spark should be strong and bright blue
Installation of the ignition system.
Most modern models of chainsaws and grass trimmers do not require you to set the ignition timing. This angle is determined by the position of the special groove on the flywheel for the keyway to the crankshaft and the magnets mounted on the same flywheel.
You only need to set the correct gap between the flywheel and the ignition coil. Depending on the tool model, the gap may be different. This is usually 0.2-0.4 mm. Since the flywheel is round, an ordinary car probe will not work for this purpose. Technically, it would be wise to expose the gap with a special template. But it is not always available. Purchasing such an expensive gauge for one-time use is unreasonable. Instead of a corporate template, you can use a strip of plastic water bottles. Cut a strip from the bottle where there is no embossing. Then the steps for setting the clearance are about the same for chainsaws and trimmers:
- Loosen the ignition bolts.
- Point the magnets on the flywheel toward the ignition coil
- Clamp the flywheel between the flywheel and coil and tighten the mounting bolts.
- Remove the strip
- Rotate the flywheel 360 degrees several times, making sure it is not clinging to the coil anywhere.
All. The gap between the coil and the flywheel is set.
Repairing the ignition coil is impossible and impractical. Below is a list of the ignition coils available for purchase on our website
Features of the reels
The gasoline grass trimmer was first fitted with manual reels, which had the simplest design. Reels consist of plastic or metal discs with a hole for the fishing line. It is shaped so that a certain size of fishing line will fit into it. It is necessary to take into account the fact that the line has to be refueled often, and before that you need to disassemble and reassemble the unit.
Mechanical heads represent a housing in which there is a bobbin with a fishing line. This “spider” quite well cope with its work. In this case the line consumption is minimal, but to change it, it is necessary to stop the device. Popularly used semi-automatic heads, i.e. е. When the line comes out in a semi-automatic form. A special mechanism is installed in it, the line is fed quickly enough, without manual intervention. The reel should touch the ground with the head, the mechanism is actuated, the cord is fed. To do this, it is not necessary to stop the machine, which is especially appreciated by owners of petrol-powered machines.
However, such reels have a number of disadvantages. Only branded models are used for work, it is not recommended to buy cheap devices, because they are not durable.
Therefore, it is not always rational to choose semi-automatic spools. Automatic devices are quite reliable, as well as efficient to use. Cord is added when engine speed is reduced in automatic mode. The line feed is automatic, which is very practical for most types of mowers, especially for brushcutters. Such heads cost twice as much as semi-automatic variants, so not everyone can buy them, but experience has shown that high-quality automatic coils last much longer than all other.
Universal head is used in different types of trimmers. This option will be optimal if the mower uses several tools for mowing the grass. Such devices fit a variety of trimmers and scythes, have a low cost, but also do not have good reliability. At the same time, they are easy to find, this is a fairly common type of coil, unlike brand-name.
How to set the ignition on a chainsaw?
Adjusting the clearance between the flywheel and ignition coil on a chainsaw is required when the tool won’t start. Immediately before adjustment, it is necessary to check the condition of the spark plug. This will require removing the wires from the head and carefully unscrew the part from the socket with a special wrench. If the spark plug is not wet and you see small light spots of oil on its ceramic walls, then you need to go to the next step.
To do this, you will need to put a cap on the plug with the original wiring and pull the starter rope a few times sharply. If you still don’t get a spark, you should adjust the clearance between the flywheel and the magneto.
A gap between these parts of the chain saw can cause careless handling of the tool. As standard, the distance between the magneto and the flywheel should be no more than 0.2 mm. Checking this value is simple enough. To do this, it is necessary to place a special gasket between the elements. If it enters freely into the space between the elements, it means that the gap is set correctly.
Many craftsmen argue that it is possible to properly adjust the ignition on a chainsaw only with the help of a template. However, not every tool owner can afford to buy a disposable product at a fairly high price. Many gardeners use homemade templates in the form of strips cut from a flat plastic juice container.
Further adjustment of the chainsaw ignition is performed in this order:
- First you need to loosen the bolts fixing the system;
- After that, a template should be inserted between the regular ignition coil and the built-in flywheel;
- At the end of the adjustment bolts need to be tightened.
Single axle tractor, power tiller, grass trimmer
It should be understood that these are different units in terms of their functionality. The difference between a power block and a power tiller is that the latter is designed to work directly on the ground (for example, plowing), and a single-axle tractor is something versatile. It can work as a cultivator, but it can also work as a pump, for example. Grass trimmer is a mower, in this case equipped with a gasoline engine (electric is more usual).
But the internal workings of the machines are virtually identical. Accordingly, it is possible to regulate the ignition of a power tiller, power tiller (cultivator with a gasoline engine) and grass trimmer according to one scheme. They have the same engine. By the way, the motor of gasoline power plants is also arranged similarly.
To adjust the ignition on a power tiller, simply adjust the gap. Is inserted folded in 4 times the paper between the flywheel and the module mount, which is responsible for the ignition of the power tiller (usually this module is undismountable), slightly press and tighten the bolts fixing the module. On the removed spark plug, a steady, powerful spark should jump when turning the flywheel. All. In some cases, it may be necessary to adjust the gap with variations in sheet thickness. It is important that there is no chafing after the sheet has been removed.
Reasons why the brushcutter cannot be started
Here are the reasons why the brushcutter engine cannot be started:
- old exhausted gasoline in the fuel tank;
- The engine starting procedure is not correct;
- short-circuited wires going to the on/off button;
- ignition system is defective;
- clogged air filter;
- Fuel filter is clogged;
- leaking fuel hoses;
- the breather plug is defective;
- The primer is broken;
- The carburetor is blocked or has a defective carburetor;
- broken choke actuator;
- engine malfunction (stuck rings).
there is old and exhausted gasoline in the fuel tank
Despite the fact that the instruction manual for each model recommends not only not to leave fuel in the gas tank, but also to preserve the engine, some owners of such equipment neglects these recommendations.
If the gas tank cap is tightly closed and the breather valve is serviceable, the gasoline will evaporate minimally during storage, but any leaks will degrade the quality of the fuel.
After all, the volatile hydrocarbons evaporate, and the remaining liquid absorbs water from the air. As a result, the combustibility of gasoline in the tank is insufficient to ignite the spark plug, so it is impossible to start the engine.
to correct the situation, you need not only to drain the old fuel from the tank, but also remove it from the carburetor.
This can be done in two ways:
- Remove the carburetor, disassemble it and drain the remaining gasoline;
- pump up the new fuel primer, and then, dozens of times pulling the starter rope, pump the old gasoline through the combustion chamber until the new fuel appears there, then dry the candle.
The first method is technically difficult, because not everyone can properly disassemble and assemble, and set in place the carburetor, and then connect it.
The second method requires a lot of stamina and patience, because you will have to pull the cord for more than one minute, selecting a free move every time, because if you do not do this, you can damage the starter mechanism.
The engine starting procedure is violated
The operating instructions for each model of grass trimmer describes the procedure for starting the engine both after winter storage or purchase, as well as during operation.
You will also find universal starting instructions in this article. Violation of the recommended order often leads to the fact that the owner of brushcutter can not start his machine.
In this case, we recommend:
- reread the manual or the corresponding article;
- dry the spark plug (it often gets flooded with gasoline or fuel mixture during improper starting);
- Start the grass trimmer in the normal way.
Short-circuiting the wires
To turn off the engine, the switch connects the wires that go to it and shunts (short-circuits) the ignition system on the low voltage.
Under the action of vibration and because of the use of wires with low-quality insulation the latter sometimes rubs, which can lead to short circuit.
Such short circuit performs the same function as the grass trimmer button turned to the “off” position, so manipulation of the button does not give any result.
To diagnose the damage, remove the trigger wire from the ignition system terminal (on some models, you have to cut or unsolder), then use a tester to measure the resistance in “on” and “off” modes between this wire and the motor housing.
If the button and wiring are serviceable, then in “on” mode, the resistance will tend to infinity, and in “off” mode, it will show a short circuit.
If wiring is damaged:
- Disassemble the operating handle;
- Desolder or cut the wires to the button as well as to the ignition system and engine;
- remove the old wires and insert new ones in their place;
- solder or clamp the new wires together;
- Reassemble the handle.
The ignition system is faulty
These are the main faults of the ignition system:
Incorrect gap between magneto and ignition coil
Two magnets are integrated into the aluminum flywheel of the engine. When the motor is running, the flywheel rotates and the magnets pass by the ignition coil, forming electromotive force (EMF) pulses in it, with two magnets providing twice as much energy charge as one.
This energy is stored in a capacitor in the ignition unit and, after the second magnet has passed, the stored energy is fed in a single pulse to the transformer, which is the ignition coil.
The effective effect of the magnets is only possible over a short distance, so the ignition unit is securely mounted, but the flywheel is mounted in a high temperature zone and its fins create an airflow that blows around the motor.
That’s why many models of brushcutters have the ability to adjust the gap between the flywheel and the block.
If the handwheel ventilation holes are clogged, the handwheel temperature becomes too high, leading to greater thermal expansion and the handwheel begins to cling to the ignition unit.
This leads to a much stronger vibration, which causes the unit to move away from the flywheel under impact, resulting in a larger gap in the cold state.
And the bigger the gap and the lower the speed of coil passage through the magnetic field, the lower the EMF and therefore the lower the spark energy, which leads to a difficult or impossible “cold start”.
optimum clearance between coil core and flywheel magnets is 0.2 mm, about the same thickness as the wall of a plastic bottle of sweet or mineral water.
Therefore for diagnostics make a feeler gauge from such bottle, cutting it necessarily across, then the gauge will curl and fit tightly around the flywheel, or you can use the dipstick for adjustment of thermal gaps of the valves.
Measure the thickness of the dipstick with a caliper or micrometer, and if the thickness corresponds, measure the gap with it, placing the magnets exactly opposite the block. If the dipstick enters with a force, the gap is optimal and you need to look for another reason, if it comes in easily, then loosen the fixing bolts, press the unit firmly against the flywheel and fix it with standard bolts.
Be sure to clean the hood vents and check their condition every day.
Faulty ignition unit (coil)
If the gap is optimal, the wires are not shorted, and the grass trimmer does not start, then check the block for malfunction.
To do this, disconnect all wires from it and remove the spark plug wire from the plug, then measure the resistance of both coils:
- primary (between the engine housing and the on/off button lead), resistance 2-3 ohms;
- Secondary (between the engine case and the spark plug wire lug) 4.5-5.5 kOhm.
If any resistance differs by more than 30%, the ignition unit must be replaced. If there is no opportunity or desire to measure the resistance, you can check the block with an ignition tester, such as this.
To check, remove the spark plug wire from the spark plug and insert the arrester tip into it, and connect the arrester wire to the motor or any ground wire. Then set the gap to 0.5-0.8 mm and pull the starter rope while looking at the spark.
If there is no spark, the lawnmower ignition unit must be replaced, but if there is a spark, the spark plug is most likely the cause of the problem and it requires.
If a spark plug failure is suspected, unscrew it from the cylinder head and inspect.
Contacts covered with black deposits indicate both a defect in the spark plug itself and an over-enriched fuel/air mixture.
This may be due to a dirty air filter or improper carburetor operation.
To check the spark plug, you need to clean it in any convenient way, for example, soaked in 9% vinegar solution for half an hour, then sprinkled with baking soda and after another half an hour washed with water and dried with compressed air.
However, for a more reliable result, we recommend putting a new spark plug, if the grass trimmer will not start to work normally, then the matter is not in the plug and you need to look for other problems, if the machine will work normally, then the preliminary diagnosis is confirmed.
After installing a new plug, we recommend checking it every 5-10 hours of operation, if the black sludge does not appear, it means that the old plug was faulty or of poor quality, but if the new part starts to turn black, the problem is in the over-enriched fuel.
Clogged air filter
The main sign of a clogged air filter is the impossibility to start the engine in normal mode, i.e. when the choke is closed, but if you start the engine without closing the choke, it sometimes works. Besides, a cranked engine reacts badly and its output is not enough for mowing.
Often because of the clogged filter black candle, to check its condition, remove the filter element from the body of the trimmer for grass (the method depends on the design of the device) and examine it.
If it is clean, it is not the problem, but if it is dark, clean it according to your brushcutter manual.
Fuel filter is clogged
The main sign that the fuel filter is clogged is that the engine is hard to start, after which it immediately stops. This occurs because the filter capacity is lower than the fuel consumption of the engine even at idle speed.
To check, pull the filter out of the tank either through the filler hole (a wire hook will be needed) or through the hole for the gasoline line and the return hose that carries the excess fuel into the tank.
If there is dirt on the filter, replace it separately or complete with hoses and sealing rubber, parts or kits for such repairs can be purchased in parts stores, and in Yandex Market.
Leaky fuel hoses
Symptoms of this malfunction are very similar to those described in the previous section.
However, even for a short time to start the motor is much more difficult, in addition, during the attempt to start the power unit, there is often a strong smell of gasoline.
To diagnose, remove the tubes from the primer and out of the fuel tank, then evaluate the force with which they were removed from the primer, as well as their overall condition.
If they become stiff or come off the primer easily, either change the tubes after making sure that the filter is in good condition, or change the whole set, including the fuel filter.
Some brushcutter models have clamps installed, so cut the hoses carefully before removing them, and don’t forget to install new clamps after replacing the hoses.
Remember, if you smell gasoline, then the hoses need to be changed regardless of their appearance and condition, and if that does not help, then you will have to disassemble the carburetor and look for fuel leaks through the gasket or a loose part.
The breather plug is defective
The breather valve is a valve in the fuel tank, whose task is to equalize the pressure at the flow of fuel and prevent the flow of gasoline when you tilt the trimmer for grass.
The most common symptom of a clogged breather. the engine starts, but in a few seconds it shuts down, because the consumed fuel is not compensated by the inflow of air, so the rarefaction in the carburetor and the tank is compared and the movement of gasoline is broken. Checking and cleaning or replacing the breather plug we described here (lawnmower stops).
The main sign of malfunction of this part is a very hard start “in the cold”, because you have to pull the cord more than a dozen times, but if you stop the warmed up engine and within a minute to start it again, then a couple of jerks will be enough.
This occurs due to the fact that the primer valve does not prevent the back flow of fuel, so it can not be pumped normally, but pulling the starter rope, you create a vacuum in the carburetor, which gradually pulls the fuel from the tank.
To replace the valve, you need to remove and disassemble the carburetor, then change the rubber seal on the valve. If you do not know how to do it or are not sure that you can do it right, take the grass trimmer to the workshop, there you can also order the appropriate seals for your carburetor model.
The carburetor is clogged with dirt or defective
With such a malfunction motor is difficult to start as on the “cold”, and on the “hot”, if you get the machine still managed, then it works poorly, that is:
If you have excluded all other faults, then either disassemble the carburetor yourself (we recommend not to do it without experience), or take it to a workshop.
Remember, the carburetor can not clog in one filling, this process even when using bad gasoline takes more than one hour, so do not wait until the machine will not start, and at the first sign of repair.
The air damper actuator is defective
The main symptom of this malfunction is difficult starting a cold brushcutter motor, especially when it is cold outside.
The warmed engine will start with one or two pulls of the recoil starter rope.
Sometimes the engine starts “cold” easily, but does not respond to a return of the choke lever to the operating position.
This is because the air damper, which cuts off the air supply in start mode (suction), is no longer held on the lever and does not turn following it.
To check the choke, disassemble the air cleaner, and with the choke lever in different settings, watch the behavior. You can also keep the lever in one position and gently rock the choke with your fingers.
Even a small amount of play indicates that both parts need to be replaced. You don’t have to disassemble the carburetor, just remove the air cleaner body, then replace the lever and damper.
You can buy them at most stores that sell parts for these machines, or you can order them through a store on the brushcutter manufacturer’s website.
Engine does not run (rings are stuck)
This defect is rare and occurs only on trimmers that were fueled with low-quality gasoline.
The main symptom of a loose ring is that the lawn mower does not start well from cold:
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- The lawn mower does not start well when cold;
- Unstable operation at idle rpm;
- Stabilization of the engine operation after warming up;
- Increased fuel consumption.
Since you need to disassemble the engine to confirm and fix the problem, rule out any other possible causes and only then proceed to disassemble the engine. To repair a two-stroke motor, simply remove the head with the cylinder, then knock out the piston pin and remove the piston itself.
However, to repair four-stroke engines will have to remove the timing chain, and then almost completely disassemble the motor.
If you are not sure you can do it right, take your brushcutter to a workshop.
Remember, if the rings are not crumbling but lodged, they can be restored with a gas burner, it is enough to heat the piston around the rings so that all the oily deposits burn out. When this happens, the rings will click softly and detach from the piston.
After that wait for the piston to cool, carefully remove the rings, use a paper knife to clean the channels, then put the removed parts back in place and reassemble the engine.
If, for example, the Patriot hand-held grass trimmer does not start, stops at high revolutions or immediately after starting, you should check the main units and assemblies of the lawnmower. The diagnostic sequence should be as follows:
- Fuel tank (fuel quality plays a big role).
- Candle and spark plug conduit.
- Air filter.
- Fuel filter.
- The breather plug.
- Exhaust valve.
Note! In most cases, malfunctions are caused by irregularities in the above nodes.
Checking the fuel system
Before you start, you should check not only the presence but also the quality of the fuel. When it comes to the choice of fuel, care must be taken, the quality must be proper. Over-saving can lead to the replacement of expensive pistons. The oil-fuel mixture must be prepared according to the instructions enclosed.
Diagnosis of the ignition system (the gap between the ignition coil and the brushcutter flywheel)
Repair of brushcutter Kommunar is needed, if it will not start on hot or cold and glows. It is quite possible that an ignition adjustment will be sufficient for the repair, otherwise the timely ignition of fuel in the engine combustion chamber will not. Such a breakdown can damage the starter assembly or break the starter cord.
Note! The ignition adjustment is normally limited to correcting the gap between the flywheel and magneto.
- Remove the cover from the engine, this is done in different ways on different models.
- Lift the two bolts that hold the magneto all the way out.
- The flywheel should be turned so that it is on top.
- Next, you need to use a calendar or business card to properly set the gap. This thickness is sufficient to achieve the necessary gap.
- The magnetic field soon draws the coil to the flywheel. Screw the bolts back on using your fingers to hold the coil.
- Pull out the paper. Grass trimmer can try to start.
Homemade Rotary CULTIVATOR For TRIMMER !?
Checking the spark plug duct and spark plug
When the lawnmower does not start by priming the spark plug, it is not difficult to find the cause. The spark is often lost after the winter. For the repair you will need to use a spark plug wrench and a spare spark plug (any motorist has one). Troubleshooting a brushcutter and fixing it yourself won’t be too much trouble.
- The spark plug must be removed and wiped clean.
- Excessive fuel should be drained out through the spark plug hole and dried together with the spark plug.
- The old spark plug must be cleaned of dirt, using a file or nail file.
- The gap is set at 1mm intervals.
- Everything is back in place, you can try to start the Patriot.
There are also more complex causes of failure:
With the above information, it shouldn’t be difficult to properly start your brushcutter and repair it with your own hands. When detecting malfunctions, you should not delay with the repair of the gasoline grass trimmer, it can lead to more serious violations in the work of important segments.
Chainsaw ignition system parts replacement
Some early electronic ignition systems consisted of two parts. starter module and coil. Today they are combined in one part. On saws with dual ignition systems, the trigger module can be replaced without replacing the coil. This is an easy job as the trigger is usually installed with a couple of screws. When replacing this part, simply remove the old module and install the new one in its place. Just make sure that the new module has a good foundation. If you notice any corrosion on the mounting connections or if the screws were not tight, this could be your ignition problem. Modules should be well connected.
Replacing the coil is a little more difficult. The ignition coil is mounted in the fan housing next to the flywheel. The module in contact with the magnetic field of the flywheel magneto produces energy for the spark and contains a reference to the ignition advance. When replacing the coil, remove the old coil and inspect it. Look for damage from contact with the flywheel. Contact between the coil and the flywheel can be caused by loose mounting screws or wear of the main crankshaft bearing.
Even if you don’t see any damage, check the crankshaft bearing. If you feel movement and play in that bearing, replace the bearing. Also inspect the flywheel. If everything looks good, install the new coil. The base of the coil should be set about 1. 1.5 mm above the magnets on the flywheel. If you do not have a petal, try using a business card or a piece of a cigarette packet as a spacer. Turn the flywheel so that the magnets face the coil. With the gasket in place, tighten the coil mounting screws remove the gasket.
When replacing the coil the gap must be set perfectly to ensure that the flywheel does not touch the coil at any point in its rotation. Also thick cardboard and thick paper should not be used, the gap must be appropriate, pay special attention to this.
The ignition system of modern chainsaws consists of a list of important parts. The main elements of the design are:
The ignition system design also includes the ignition coil, breaker and capacitor. The coil is responsible for turning on the core and winding the transformer. Candles in knot design consist of side and center electrodes, outer casing and insulator.
The chopper and coil winding are connected in series. The chopper is disengaged by the cam on the chainsaw crankshaft. The magneto of the ignition system is mounted on the left side of the crankcase with a nut and two studs.
During chainsaw starting a magnetic field is created by the flywheel magnets, which crosses the coil. If the primary winding contacts are closed, a weak current is generated in the ignition system. If the contacts are open, no magnetic field is produced, resulting in a high voltage in the secondary winding. The current is then fed to the spark plug, which ignites the fuel to start the chainsaw.
Chainsaw ignition system
The device of any modern chainsaw consists of a number of important mechanisms, on the coordinated operation of which depends the efficiency and performance of the garden tool on the site. One of these nodes is the ignition system. It is responsible for creating the spark necessary to ignite the fuel in the engine cylinder. Without a serviceable ignition system, the household garden tool will not be able to start, so every gardener needs to study its device, as well as the rules of adjustment and maintenance of the unit with their own hands.
What to do if you do not have a multimeter handy?
If you are far from home or you just do not have a multimeter, you can use the method of rapid diagnosis.
In the field, you can make an independent express diagnosis of the coil serviceability. To do this, you must unscrew the plug and put the body of the plug to the cylinder. Pull the starter and observe if there is a spark? If there is a spark, the coil is working.
This method is not perfect and has uncertainties due to the fact that with an unnatural spark plug position, without compression, the spark can be very good. But when you install it in the cylinder, when compression appears, it simply disappears. Therefore, this method of checking does not give any guarantees.