Weak spark on trimmer what to do. What to do if the gasoline lawnmower does not start. Troubleshooting strategy
Many trimmer owners face a problem when the device simply does not start.
One of the reasons could be a lack of spark. This usually happens when fuel fills the spark plug. You should also check the spark plugs for proper operation, as this can also lead to a lack of spark.
The first sign of a faulty spark plug is the presence of a short circuit between its contacts, and in short. No spark at the trimmer.
In addition, the spark plug is considered faulty if it is covered with a black wet layer.
Such a layer is caused by oil that has penetrated into the combustion chamber. In this situation, you have two choices: either clean the spark plug properly or buy a new one.
Sometimes it happens that the plugs are clean, but, in this case, the problem may be in its insulation, which is often covered with a black dry sludge.
This could be caused by a weak spark plug, too low spark plug temperature, poor fuel quality, a dirty air filter or long idle times.
Here the solution is the same. clean the spark plug or replace it with a new one. over, the spark plug should also be replaced if the contacts are quite worn out.
In the case where there is no spark on the trimmer, how to solve the problem you will be prompted by professionals at the service station.
Sometimes, the problem could be with the magneto. The magneto can fail because you may have pulled the starter cord when the ignition was off and the spark plug was not grounded to earth.
Such an action could easily destroy a magneto. In such a situation, the only solution is to buy a new magneto.
The problem may also be in the ignition assembly. This option can be considered if the spark plug and wire do not have any faults.
In such a situation, it is necessary to replace the ignition assembly. It can be found attached with two screws to the engine cylinder.
To get free access to the node, you need to remove the enclosure.
To correct the situation, the entire assembly will need to be replaced since experience has shown that replacing individual parts is not sufficient.
If there is no spark at the trimmer, there is only one way to fix it: replace it.
To check the current flow into the coil’s primary winding, you can use a light bulb, which should be turned on instead of the coil.
Then you need to carefully inspect the contacts of the chopper. If there is a strong spark between the contacts at the moment of opening, you can be sure that the capacitor is broken.
In such a case you have only one option for further action. to replace the capacitor.
Diagnosing a magneto
The magneto is the key component in the ignition system of engines. It is a coil with a core that surrounds the primary and then the secondary windings. If this part is defective, there is no spark on the spark plug, and the fuel does not ignite.
The first way
Check the serviceability of magneto can be checked with a tester. To do this, perform the following sequence of actions.
- Set the tester properly: use the resistance measurement function and set it to 200 ohms to measure the primary.
- Direct the first electrode of the measuring device to the “ground” of the magneto, and the second. to the output contact. If the primary winding is serviceable, readings should be 0.4 to 2 ohms.
- Set the switch on the tester to 20 kohms to diagnose the secondary winding. Then place the first probe inside the cap and the second probe on the ground. If everything is in order, the indicators will range from 4 to 6 Kohm, depending on the model of grass trimmer, whether “Patriot 547”, Husquarna 128 r or other brand of equipment. If the circuit is broken, the tester will show infinity on the screen. And if a short circuit occurs, the display will show zero.
The second way
If you can not use the tester, there is another way to test. It is important not to touch the cylinder with the electrode, otherwise the coil will be damaged.
- Remove the cap from the spark plug. You should not unscrew the spark plug, as this will keep the compression.
- Then you need to pick up a nail with the head removed and insert it firmly into the cap.
- Next, the cap with the nail should be securely attached to the cylinder with dielectric. The electrode should be 5.5 to 7 mm from the cylinder head but not touching the ground.
- Then you need to run a starter to simulate the start of the engine with the ignition button on. At the same time you need to carefully observe whether the spark appears, and try to determine its color.
Important! A strong white or blue spark is a positive indication that the magnetometer is in good working order. If it is weak and also orange or yellow in color, the magneto is defective.
There is an important point to keep in mind when diagnosing: an unheated magnetos can produce a powerful spark in any condition. But if it is faulty, it stops generating current when hot, and the grass trimmer will not start. Later, after cooling down, the coil returns to the operating level, the single axle tractor turns on and runs idle or under load for a while until the magneto temperature rises again. In this case, the part should be replaced with a new one.
Just a side note! In some situations, the problem with heating is not the fault of the coil, but because of the spark plug. This means that it is necessary to check both parts.
Wet chainsaw plug: why and what to do
You can also use to clean the carburetor and a special washer.
- If the carburetor gaskets are worn out, it is necessary to change them. And if the tightness of this device is compromised, you will have to determine the faulty part of the carburetor and replace it.
- Grass trimmer may not start due to wear of the piston group. However, it is better to change such parts of the lawnmower in the service center.
Immediately after buying a grass trimmer for grass, we are faced with a lot of questions. how to use it correctly, how to fuel it (if it is a gasoline tool) and, of course, what line for the trimmer is the best to choose. Find the answer to the last question in the article.
How to quickly remove the stump without uprooting?
Many gardeners sooner or later face the need to cut down trees growing on the plot. After that, the stumps remain, and if the trees were of considerable size, it is very problematic to uproot them. This article discusses alternative ways to get rid of stumps.
Treatment of currants in autumn against pests and diseases
Almost every dacha owner grows currants, which are loved because of their taste and health benefits. It requires proper care, which also consists of treating plants against pests and diseases. On the peculiarities of these autumn activities told in the article.
How to choose a gasoline trimmer for grass?
A beautiful well-maintained lawn. an ornament to any site. And keep it attractive helps regular mowing. In this case, you can not do without a lawnmower or grass trimmer. In this article let’s talk about the intricacies of choosing a gasoline trimmer for grass.
And again, the carburetor.
But if even after such mockery your trimmer for grass will not start, you can not do without disassembling the carburetor. It is very possible that the fault is a trapped needle in it. In any case, disassembly and flushing of this capricious mechanism certainly wouldn’t hurt. Adjusting the carburetor lawn mower can do with their own hands lawn mowers, like all power tools for the garden, is not difficult to service technique. Repair, tune without the help of others can and must. For example, the adjustment of the lawnmower carburetor with their own hands. a matter of 5 minutes. Lawnmower carburetor. It’s a part of the power system. Idle.
Many owners of trimmers face a problem when the device simply does not start.
One of the reasons for this may be the lack of spark. This usually happens when the fuel floods the spark plug. In addition, you need to check the spark plugs for serviceability, as this can also lead to a lack of spark.
The first sign of a faulty spark plug is a short circuit between the spark plug pins. in short. No spark at the trimmer.
Also, a spark plug is considered faulty if it is covered with a black wet layer.
Such a layer appears from oil in the combustion chamber. In that situation you have two choices: either clean the spark plug properly or buy a new one.
Sometimes it happens that the plugs are clean, but the problem may be in their insulation, which is often covered with a black, dry sludge.
The cause could be a weak spark, spark plug temperature that is too low, poor fuel quality, a dirty air filter or prolonged idling.
The solution is the same here. clean the spark plug or replace it with a new one. over, the spark plug should also be replaced if the contacts are quite worn.
In the case where there is no spark on the trimmer, how to solve the problem you will be prompted by professionals at the service station.
Sometimes the problem may be with the magneto. The magneto can fail because you may have pulled the starter cord when the ignition was off and the spark plug was not grounded to earth.
Such actions can easily take the magneto out of commission. In such a situation, the only solution is to buy a new magneto.
Alternatively, the problem may lie in the ignition assembly. This option can be considered if the spark plug and wire do not have any faults.
In such a situation, it is necessary to deal with the replacement of the ignition unit. It can be found attached to the engine cylinder with two screws.
To get free access to the assembly, it is necessary to remove the enclosing cover.
To correct the situation, it is necessary to replace the entire assembly, since practice has shown that replacing individual parts is not sufficient.
If there is no spark on the trimmer, there is only one way to fix it. to replace it.
over, sometimes the problem should be looked for in the ignition coil. The absence of spark may be caused by the coil malfunction or a fault in the circuit.
A light bulb can be used in place of the coil to check the current flow in the primary winding.
Then the pins of the chopper need to be carefully inspected. If there is a strong spark between the pins at the moment of opening, you can be sure that the capacitor is broken.
In this case you have only one option for further action. to replace the capacitor.
Why you need a good spark.
The quality of the spark determines its ability to ignite a properly formed air-fuel mixture under operating conditions. A weak spark in a high-pressure, high-temperature combustion chamber cannot do that. Ignition is delayed or does not occur at all. There is irregularity in the engine, the engine does not gain revolutions, there is vibration, detonation, the starter can 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. it’s. It turns out that the spark can ignite such a spark, but the correct spark does not have it. But the use of enriched mixture leads to rapid wear of the cylinder piston group and muffler. Therefore, in such questionable situations, once again check both the carburetor and the ignition coil.
The quality of the spark determines its ability to ignite a properly formed air-fuel mixture under operating criteria. The initial ignition of the consistency is in the spark or as it is also called a breakdown cord from the pulse of the electronic current generated by the ignition coil. In this place there is practically instantaneous heating of gasoline molecules and oxygen, from what factors they enter into a chemical reaction of combustion.
It is clear that any differences in the characteristics of the spark leads to incorrect operation. Circumstances of such deviations a lot. Common:
- temperature unstable operation of the ignition module: when cool, the coil works fine, when warmed it stops working. Appears in the normal operation of the engine on a cool, and failure on a warm. This is justified by the fact that there are diodes, transistors and a capacitor inside the coil. Failure of any of these parts appears only at warm-up.
- faulty spark plug. We will not repeat here. You can find the material on the web.
- bad contact, rust at the connection point and a faulty switch we will not explain here
- A frayed (jammed, melted, etc.).д.) high-voltage wire. Here, too, what is left for our client to do is clear
How to choose models
- Spare parts for Chinese brush saws 45, 52 cc.cc
- Spare parts for Chinese Gasoline-Powered Saw 38cc.see
- Spare parts for Chinese saws 25 cc.see
- Spare parts for Chinese STIHL 660
- Spare parts for Partner 350, 351, 352, 371
- Spare parts for Partner 340S, 350S, 360S
- Spare parts for Husqvarna 137, 142
- Spare parts for Husqvarna 230, 235, 236, 240
- Spare parts for Husqvarna 365, 372
- Spare parts for STIHL 180
- Spare parts for STIHL 210, 230, 250
- Spare parts for STIHL 290
- Spare parts for STIHL 361
- grass trimmers
- Spare parts for Chinese grass trimmer 33, 43, 52 cc.see
- Spare parts for Chinese grass trimmer 26 cc.see
- Spare parts for Husqvarna 125, 128
- Spare parts for Favorit T283, T284
Where to start defect diagnostics if your grass trimmer won’t start? In situations where the tool stalls immediately after starting, it is worth looking at the following units of the machine:
Specifically, the breakdown of the above locations more often leads to the fact that the grass trimmer starts badly
Let’s look at how to eliminate such troubles.
Does not start in the cold grass trimmer. eliminate the cause
when cold.The reason. air suction, which does not allow fuel to be pumped. Into the chamber.
After a few jerks it will start and then stop, which is normal. What to do when the fuel was definitely normal, the spark is there, but the gasoline grass trimmer does not start? After resetting the choke to the operating position, start the machine again and start working.
How to clean and store the tool?
During the operation of the lawnmower, monitor the condition of the engine cooling system. The channels in the starter housing and the ribs in the cylinder should always be clean. If you ignore this condition and continue to use your brushcutter, the engine may overheat and fail.
Competent care of a gasoline lawn mower during operation allows its use for several seasons without serious repair
Let the engine cool down before cleaning. Take a brush with a soft pile and clean the dirt from the outer surface. Plastic parts are cleaned with solvents, including kerosene, or special detergents.
At the end of the summer season lawn mower should be prepared for long-term storage. For this purpose the fuel mixture is drained from the tank. Then the engine is started in order to exhaust the residual fuel in the carburetor. The entire tool is well cleaned of dirt and sent to “winter hibernation”.
As you can see, the repair of faults of a household lawn mower can be quite on their own. It is worth turning to the services in the case of serious breakdowns. In this case, you should correlate the cost of repair with the price of a new lawnmower. It may make more sense to buy a new tool.