Why the trimmer does not start: the causes of the malfunction and how to fix them

How to prevent the occurrence of sudden breakdowns during the operation of the trimmer?

In order for the unit to always be in a functional state, it is worth observing a few simple rules:

1. Conduct timely, regular technical inspection of the main mechanical components of the device.
2. Fill the trimmer exclusively with fresh fuel, the quality and origin of which is beyond doubt.
3. After each use of the tool, check whether oxides and deposits have formed on the surface of the elements of the ignition system.
4. Avoid heavy loading of the trimmer during work.

In order for the unit to remain in working condition, it is necessary to properly prepare it for storage in the winter. First of all, you should completely disassemble the tool, and then flush and clean the constituent elements.

It is also important to inspect the functional blocks for damage, if necessary, eliminate the deformation of parts, all kinds of distortions, ruptures of materials.

When storing the trimmer, it is worth filling the gearbox with a sufficient amount of oil. Then you need to clean the air filter, partially disassemble, blow and rinse the engine of the unit. After drying all the mechanisms, you should lubricate the moving parts. To treat the piston system with oils, you must first remove the spark plug. Then you need to move the piston to its extreme position, then pour a small amount of oil into the candle hole and scroll the crankshaft. If stored petrol
trimmer in the off-season is planned not in the house, it is recommended to tightly wrap the engine of the unit with oiled rags. This will avoid the development of corrosion on the surface of important components of the mechanism.

The question of how to start the trimmer if the trimmer does not start or starts poorly will arise if the engine of the gasoline trimmer is worn out, unadjusted, or when a lot of fuel got into the combustion chamber due to a violation of the sequence of operations when starting the engine (when the engine was “sucked in”). To help the engine start, you can pour a little fuel into the cylinder through the spark plug hole.To do this, it is better to use a special starting fluid, but you can also use ordinary fuel from a tank of a started trimmer or lawn mowers.

A new chainsaw or gas trimmer (scythe) may not start.

Another example when the fuel mixture is pumped is to turn the chainsaw over so that the muffler is at the bottom. Mixture may start to drip out of it. This is also the reason when the chainsaw does not start. Exhaust fumes are visible on startup, but will not start. It is necessary to pump it over at the “hot start”, the saw will start after a while.

The next day, the chainsaw or brushcutter, if stored in a warm, non-humid place, usually starts from the working position, try it. Failed to start, then do everything according to science starting with a cold start.

Fuel filter in the tank. We need to check its functionality. But do not leave the inlet pipe without a filter.

It also makes sense to check the air filter. You need to remove the air filter and try to start without it. If it starts, then you need to either clean and rinse the old filter, or install a new one.

There are two more tips from experienced users of inexpensive lawn mowers:

the brushcutter starts easier if it is laid on its side with the air filter up so that the mixture obediently falls down into the carburetor, and you can still remove the air filter, put 1-2 drops of the mixture into the carburetor, install the filter in place and. about a miracle. Starts up!

If it failed to start again, then you should unscrew the candle, dry the combustion chamber. At the same time, check the spark plug for performance. It can fail unpredictably. One of the annoying reasons is a non-working spark plug.

So, the candle turns out to be serviceable.What are we doing? If the warranty period has passed, the service is far away and there is no desire, then you can still take some steps to revive the instrument with your own hands.

If there are no traces of the mixture on the candle, the candle is dry, which means that the mixture does not enter the engine cylinder from the carburetor. But still it is worth checking the final operation of the candle. Pour a little mixture directly into the cylinder and twist the candle. We make several attempts at the establishment. You do not need to pull out the crank handle to the maximum, you will break the starter mechanism ahead of time. With a good spark plug, the engine will start, run a little and stall - that's right. So the carburetor is not letting the mixture through.

It happens that out of savings, the user buys gasoline where it is cheaper. At such filling stations, water can get into gasoline. This gasoline was sold to you.

Either the storage of gasoline or the mixture was for some time in a container with an open lid at high humidity, or even a drop of water got into the mixture. One small drop of water in a carburetor is enough to disrupt its smooth operation.

If the user also tries to save on a fuel additive (oil for 2-stroke engines), then the situation worsens, since such an oil dissolves worse in gasoline. In the carburetor, a thin film forms on the fuel filter in the carburetor. The flow of the mixture is severely limited or stopped.

The carburetor in lawn mowers and chainsaws is a very delicate mechanism. Remove from the engine and disassemble it carefully. They dismantled it in a low-dust room, blew it out, dried it, washed the fuel filter mesh (very carefully!) If it was dirty. For petrol equipment with a service life of 1-2 years, this is enough, it remains to assemble and start.We start according to all the rules of the science of the institution - cold start, hot start.

But the universal advice for starting a chainsaw or lawn mower and even a snow blower (if the spark plug, clean air and fuel filter, fresh mixture of gasoline and oil in the appropriate proportion) is working - close the carburetor choke, 2-3 starter movement, open the carburetor choke (completely ), 2-3 starter movements. So repeat. After 3-5 cycles, it will start to start.

There is a spark, the candle is wet

First of all, it is necessary to remove the muffler and carefully inspect the piston, since this is where the problem may be hiding. but the chainsaw still does not start or stalls, the saw does not start, Partner 350. In addition, most owners are wondering: why does the chainsaw start and stall, while supposedly there are no problems with candles?

But this is an erroneous opinion and you don’t need to be so sure in this case, because there are situations when the candle sparkles beautifully in air, but does not work directly in the cylinder.

The reason for this may be a direct violation of a kind of compaction in the region of the channel (impulsive). Or so de there is a kind of development of crankshaft seals, but this feature occurs in very rare cases.

The Stihl ms 660 chainsaw is the most economical of the entire Stihl chainsaw line. Its price ranges from 3100 to 5500 rubles.

What is the resource of the Chinese lawn mower?

A Chinese or Russian motokosa is capable of working out about 500 hours. But this is with the right mixture, good oil, good factory assembly.If a person pours gasoline from one good gas station, accurately measures the same oil in a beaker, adjusts the carburetor for the same mixture, the fuel burns correctly, then the coveted five thousand hours of motor life is quite an affordable bar.

But here we must not forget about the Chinese marriage. They even balance the shafts on the knee, put the cheapest bearings, stamp the carburetors already with clogged channels. If a a person understands the principle of work two-stroke engine and carburetor, understands how to sort it out, then he can eventually assemble an almost perfect trimmer.

In general, if we consider the Chinese brush cutter as a space for creativity, then even its breakdown is a reason to learn something new, this is a constructor for a man.

If you need a tool, then you should find a Japanese analogue, or switch to an electric model.

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Wet chainsaw candle: why and what to do

You can use it to clean the carburetor and special flushing.

• If the carburetor gaskets are worn out, you need to change them. And if the tightness of this device is violated, it will be necessary to determine the faulty part of the carburetor and replace it.
• The trimmer may not start due to wear of the piston group. However, it is better to change such parts of lawn mowers in a service center.

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Dry and wet candle what it means and how it affects the engine start

Most tool owners immediately resort to checking the condition of the spark plug contacts. This is done in order to understand, by the state of the candle, what could be the reason for the impossibility of starting the lawn mowing engine. Based on the condition of the spark plug contacts, appropriate conclusions can be drawn about what could be the cause of the malfunction. Diagnostics of the spark plug on the trimmer is performed in the following order:

1. The spark plug is unscrewed, after which it is subject to inspection. The ideal condition of the electrodes is if they have a brown soot (brick color). If the candle is wet, has a black or white soot, then this indicates a corresponding malfunction.
2. If the spark plug is wet, then there is a portion of unburned fuel in the combustion chamber that does not need to be drained. Clean and dry the spark plug contacts, then make sure it is in good condition. To do this, connect it to the candlestick, and place it on the surface of the cylinder. Turn on the ignition, and pull the starter handle lightly. In this case, the candle should give out a high-quality and constant spark. If the spark is weak or not at all, then the spark plug should be replaced.
3. The trimmer will not start due to the large gap between the contacts of the candle. The gap between the spark plug electrodes should be between 0.7 and 1 mm. To set the gap, special probes are used.

It is interesting! It is strictly contraindicated to dry the contacts of the candle by calcining them, since this method will lead to damage to the part.
 

If there is a spark on the candle, but the trimmer does not start, then the reason is the supply of the fuel mixture to the combustion chamber. To verify this, follow these steps:

• Draw 20 grams of fuel into a cap from a PET bottle or into a syringe
• Pour it into the combustion chamber through the spark plug hole.
• Screw in the spark plug
• Put on the spark plug and start the engine

If the lawn mower engine starts after the actions taken, then the cause of the malfunction should be sought directly in the fuel line and carburetor. If the engine does not start even after the actions taken, then you need to check the condition of the high-voltage wire. A high-voltage wire, like a spark plug, is a consumable. If there is a suspicion of a malfunction of the trimmer armored wire, then it should be replaced

If after the actions taken it is not possible to start the engine of the lawn mower, then the following recommendations should be taken into account:

1. If there is any doubt about the serviceability of the spark plug and high-voltage wire, it is recommended to replace them immediately.
2. Check the spark formation, and if there is no spark on the new candle, then the breakdown is related to the ignition unit - coil failure
3. The ignition coil is not repaired, but changed. If the diagnostics really indicate a malfunction of the ignition coil of the lawn mower, then it is not difficult to replace it yourself

If there is a candle on the spark, and at the same time it is dry, and the trimmer does not want to start, then we proceed to check the next unit - the air and fuel filters.

It is interesting! If the spark plug electrodes are red or pink, this indicates that the composition of the fuel used contains a large amount of additives. You should refuse such fuel by changing the filling station or brand of gasoline.

What to do if the engine does not start?

If it is not possible to start a lawn mower, then the first thing to do is to check the presence of fuel in the tank and its quality. To refuel the tool, it is recommended to use high-quality gasoline purchased at gas stations, the brand of which must be at least AI-92. Saving on cheap fuel can lead to a breakdown of the cylinder-piston group, the repair of which can take a third of the cost of the lawn mower itself

Equally important and correctly prepare the fuel mixture of gasoline and oil. The proportional ratio of these components of the mixture is indicated by the manufacturer in the manual

Do not prepare the fuel mixture in large volumes, as long-term storage loses its properties.It is better to use a freshly prepared mixture.

When preparing the fuel mixture, pour the oil into gasoline using a medical syringe, which allows you to accurately maintain the required proportion of components

A clogged fuel filter in the tank can also interfere with the engine of the lawn mower. Therefore, if you have problems starting the engine, check the condition of the filter. Replace the filter if necessary. It is forbidden to leave the inlet pipe without a fuel filter.

The air filter also needs to be checked. When contaminated, the part is removed, washed in gasoline in the field and put in place. In the country or at home, the filter can be washed in water using detergents. After that, the filter is rinsed, wrung out and dried. The dried filter is moistened with a small amount of oil used to prepare the fuel mixture. Excess oil is removed by squeezing the filter with your hands. The part is then put into place. The removed cover is put back and fixed with screws.

The air filter, washed in the fuel mixture, wrung out and dried, is put in place in a plastic case and closed with a lid

How this procedure is done in more detail you can see on the video:

If all of the above procedures are carried out, and the engine does not start, then adjust its idle speed by tightening the carburetor screw

In the video posted at the beginning of the article, attention is paid to this issue.

So, in order:

1. Lay the tool on its side so that the air filter is at the top. With this arrangement of the chainsaw, the fuel mixture enters exactly into the bottom of the carburetor.On the first try, the engine will start if you remove the air filter before starting and pour a few drops of the mixture into the carburetor, then reinstall the dismantled parts. The method has been tested in practice.
2. If the first tip does not work, then most likely the problem is in the spark plug. In this case, unscrew the spark plug and check its performance, and also dry the combustion chamber. Replace the spark plug that shows no signs of life with a new one.
3. If the spark plug is in good condition, the filters are clean and the fuel mixture is fresh, then you can use the universal way to start the engine. Close the carburetor choke and pull the starter handle once. Then open the throttle and pull the starter 2-3 more times. Repeat the procedure three to five times. The engine will definitely start.

Some pull the handle with such force that they have to repair the starter of the lawn mower with their own hands. This is only possible if the cable breaks or the cable handle breaks. In other cases, it is recommended to replace the starter. This unit is sold as a set.

The lawn mower does not start or starts, but stalls. What is the reason?

To understand this, you need to know the principle of operation of the unit as a whole. It also happens that, just bought, a new saw does not start, and running around the service centers begins, in such cases it is recommended:

• carefully read the instruction manual; • study in detail the method of the first winding and running-in of lawn mowers; • try to understand how the product works; • how to pump gasoline and so on.

Reasons for the malfunction of the lawn mower:

• the quality of gasoline is poor; • wrong proportion of gasoline and oil; • clogging of the fine filter; • the spark is gone.

Lawnmower won't start after winter

In such cases, it is necessary to carry out maintenance of the unit. Remove the fuel system, including filters (air, fuel), disassemble the carburetor, clean and rinse each assembly. Blow out filters with air

Pay attention to the quality and octane number of fuel

It should be noted that the products of such well-known companies as STIHL, Husgvarna and other brands will not work on cheap low-octane gasoline. For them, suitable fuel from the AI ​​​​grade is 92 and higher from automobile gas stations, and then from well-established ones, since gas stations also have bad gasoline. From the use of high-octane and high-quality gasoline, it will depend on how long the lawn mower will be used and how long it will last.

It is necessary to take into account one more fact that during long-term storage of a diluted fuel mixture, its working qualities decrease, which also leads to consequences in which fuel pump won't start. Therefore, it should be diluted in portions, that is, such an amount of the mixture that is produced at a time. The instruction manual clearly describes and explains the proportion of mixing gasoline and oil. Strict observance of the correct proportions will at least save you from a few questions why the lawn mower does not start and what to do in such cases.

The petrol engine starts and dies. What to do?

1. There is a spark, and everything seems to be normal, but the lawn mower does not start, in such cases you should check the air access valve to the fuel tank.A clogged valve leads to a vacuum in the tank, in which the carburetor receives less gasoline, so the lawn mower will start, but then stall. To eliminate this cause, it is necessary to clean the valve and try to start the lawn mower with the tank cap not fully screwed on. 2. If at the same time the lawn mower does not start, you should remove and clean the fuel filter, and also check all the details of the carburetor, and then try to start. The lawn mower does not start again, the air filter is disconnected, try to start it without it, if the lawn mower starts, then the reason is in the air filter, replace it.

Lawnmower won't start, no spark

The disappearance of a spark entails checking the contacts and the correct gap between them, the conductive wires to the candle and the candle itself. The way to check the spark is to unscrew the spark plug, connect a wire to it, attach the spark plug sideways to the motor casing and pull the starter several times, as if starting a lawn mower, while looking at the coal and the spark plug contact, a spark should run between them. If there is no spark, take a new candle, follow the same procedure, if the spark is not visible, then the problem is in the wire or contacts, it is better to replace them.

Lawnmower won't start when cold

When starting a cold engine, it is not recommended to press the gas. Tilt the lawn mower so that the air filter is on top, press the fuel suction button 5-6 times, set the function switch lever to the “start” position, pull the starter cord several times until the engine starts. After a few seconds of running the engine, turn off the starting system.

Lawnmower won't start when hot

If the lawn mower was recently in operation and has not yet had time to cool down but does not want to start, press the gas trigger, pull the starter cord sharply several times until the engine starts and only then the gas trigger is released. If a lot of time has passed and the lawn mower has had time to cool down, then you need to start it as if it were cold. If the above methods did not help, the lawn mower did not start, then you should contact the service center.

Authorized service center "Agrotechservice" - comprehensive warranty and post-warranty service for landscape gardening, municipal, power and construction equipment of world manufacturers!

What should I do if a chainsaw spark plug is flooded?

Most often, this happens to beginners when, at the first start, they skip a “pop” on a closed air damper and continue to pull the starter handle, so there is a lot of gasoline in the combustion chamber, and not enough air prevents gasoline from igniting.

The problem is solved simply:

1. We unscrew the candle with a candle key and check its condition. If the candle is wet and there is a spark, then it was flooded. We open the air damper, turn on the switch button, squeeze the gas “to the stop” and start it. Excess gasoline should come out of the exhaust saw and the saw will start.
2. We unscrew the candle with a candle key and check its condition. If the candle is wet and there is a spark, then it was flooded. Turn the chainsaw upside down and turn the starter about ten times, while excess fuel will flow out of the engine cylinder. Then wipe dry (bake) the spark plug, or replace it with a new one and try to start the engine again exactly following the operating instructions.If the spark plug is completely dry, it means that the engine is not getting fuel. And since it is in the tank, the problem is probably in the carburetor. You can draw a little mixture into the syringe, inject it into the cylinder, tighten the candle and try to start the engine. But if the engine starts and immediately stalls, then the problem remains and you need to contact the service center.

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Why does the chainsaw stall

If the chainsaw starts and stalls, the reasons may be different. An external inspection should be carried out before attempting to repair the instrument.

If the saw stalled during operation, you should check the presence of a mixture of oil and gasoline in the tank. If the fuel mixture is over, the device will not work. In those situations where there is still gasoline left, you should evaluate the quality of the tool until it is turned off. The occurrence of extraneous sounds and the subsequent abrupt stop should alert.

The formation of deposits on the electrodes can also cause difficulties in the operation of the tool. The device should be carefully inspected and cleaned if necessary.

When you press on the gas

In cases where the chainsaw stalls when you press the gas, check the muffler and fuel filter. A possible cause of the problem is a leak in the fuel hoses. In some cases, adding turns helps.

Sometimes checking all the details does not work, the tool suffocates, chokes when gas is added. If the device stalls when a person presses the gas, it is possible to supply fuel in an insufficient amount for normal operation.This phenomenon occurs due to clogging of the carburetor or filter.

Damage can also occur due to clogging of the air filter with dust. When you give gas, the device stops working. You should not troubleshoot the problem yourself, since each model has individual characteristics.

The cause of the problem may be insufficient or lack of lubrication on the chainsaw chain. If the chain is dry, you should clean the channels through which oil is supplied to the device bus. If the oil leaks, there are cracks, defects on the pipes, they must be treated with a sealant.

Under load

In situations where the device stalls under load, the problem may be with the gas tank or filters. Check fuel quality and change filter.

Often the saw does not gain momentum due to the fact that the mixture poured into the gas tank has a low octane number. There is not enough power, sufficient heating does not work, the chainsaw stalls under load.

Often, component failures lead to the fact that the device stalls under load. Hoses, seals, gaskets should be checked for suction. If the parts are defective, you can try to repair or replace them.

In cases where the chainsaw starts and immediately stalls, there is not enough fuel, the device does not heat up. Refuel the device

It is important to use the right mixture. For different models better fit different kinds fuel. It is necessary to read the instructions, recommendations, reviews of people for whom the device works normally

It is necessary to read the instructions, recommendations, reviews of people for whom the device works normally.

At idle

In situations where the chainsaw stalls at idle, you need to inspect the condition of the muffler. If the part is contaminated, the exhaust gases are poorly removed, the engine cannot continue to work, it stops.

The saw stalls at idle and in cases where the carburetor is not set correctly. For beginners, it is better to entrust the repair to specialists, since there is a possibility of incorrect settings, due to which the tool will not be able to work. A tachometer is required to adjust the carburetor.

At high speeds

If the device stalls at high speeds, pay attention to the condition of the gasoline and air filters, the serviceability of the fuel hoses

A dirty air filter can be washed under warm running water.

It is important to dry the part thoroughly before installing it, so that water does not impair the tool's serviceability.

If fluid stops flowing through the fuel hose, it is clogged. You can clean the part or replace it with a new one.

In cases where the saw stalls at high speeds, but the liquid flows in full through the hose, and the air filter is clean and in good condition, look for the cause of the breakdown in the fuel filter. Replace it with a new one or clean it.

In some cases, the problem is hidden in the gasoline pump. When the component is worn out, the fuel begins to flow through the walls. If this phenomenon is observed, a new pump should be installed.

When tilted

If the saw does not develop speed when tilted, turns off, stops working, you need to check the fuel level in the tank. If it is not too high, the tilted device is not supplied with enough fuel because the fuel tube is above the mixture level.

Why the chainsaw does not start - causes and solutions

Each model has its weak points. Some saws require regular carburetor adjustments. The disadvantage of others lies in the chain lubrication system. Be that as it may, any breakdown can be repaired with your own hands, if you figure out what its cause is, and what are its signs.

What to do if the chainsaw stalls when you press the gas?

As a rule, owners of chainsaws begin to encounter this breakdown after the first 6 months of intensive use of the tool. There may be several reasons for this failure.

Their list includes:

• using a fuel mixture prepared in the wrong proportion. If you regularly pour low-quality gasoline into the chainsaw tank, in which too much or too little oil is mixed, the tool will not start. In this case, you will need to drain the fuel, as well as dry the engine cylinder. To do this, you need to sharply pull the starter cable towards you several times. After that, you need to fill in the correctly prepared fuel, and start the saw engine;
• flooding the spark plug with oil at the time of starting the engine. This problem can be solved by removing, cleaning and drying the candle. After 30 minutes, the candle will dry, and it can be screwed in. After that, you need to start a chainsaw;
• lack of spark. This indicates poor contact between the factory high voltage wire and the spark plug tip. If the contact is not broken, but there is still no spark, then you need to check the electronic unit of the chainsaw ignition system. This element cannot be repaired, so it will need to be completely replaced;
• clogged air filter. This saw element must be regularly cleaned from debris, small insects and dust.Otherwise, air will not enter the carburetor, where it should enrich the fuel mixture. As a result, the saw will stop starting. To solve the problem, you will need to clean the filter, or replace it.

Electric trimmer vibrates

Many mower users have noticed that after some time after the start of the machine, it starts to vibrate strongly. On some trimmers, mainly in more expensive models, an anti-vibration system is installed in the form of shock absorbers located between the engine and the bar. But in some cases, even she does not save from strong vibration. The reason that a strong vibration appears in the trimmer may be a small amount or complete absence of lubrication on a rigid or flexible shaft located inside the bar of the device.

Replacement rigid shaft lubrication
happens like this:

unscrew the gearbox located at the bottom of the rod;

after removing the gearbox, you will see the end of the shaft, which you need to pull to remove the part;

after removing the shaft, it must be liberally lubricated with special grease "Shrus-4" or ordinary - "Litol-24";

• apply a small amount of grease to the shaft and spread it evenly along the entire length of the part, including the splines at the ends of the rod (if they work out, the shaft will have to be replaced);
• after lubrication, insert the shaft back into the shaft and put the gearbox in its original place.

Flexible shaft lubrication
is done as follows:

• unscrew and remove the mowing head;
• remove the rod from the electric motor by unscrewing a couple of bolts;
• pull the flexible cable out of the rod;
• lubricate the cable with grease along the entire length.

This is done as follows: first you need to lubricate the end of the cable, and then insert it into the rod, after which, as it moves inside the pipe, you should apply lubricant to the part and evenly distribute it over the surface. Then insert the flexible shaft rod into the electric motor and secure it.