What to do if the gas trimmer does not pick up rpm?

If you have ever purchased a trimmer that works with gasoline, then you probably had to deal with the problem of turning on the trimmer, as well as with the problem that the gas trimmer does not gain momentum.

That is why this article was created.

So, what should you do if the trimmer that has been working for you for several years suddenly just stops gaining rpm, and the engine simply stalls? IN in this case You and I should consider a number of problems associated with stopping the engine.

The engine may stall under various circumstances. I have a problem with the Stihl FS38 trimmer, what is the reason it does not develop speed. Sometimes the reason incorrect operation trimmer powered by gasoline is a clogged air filter.

The filter is one of the most important reasons why a gasoline trimmer may stop working.

Very often various debris gets into it, dust particles get there, which also clog the filter, so it needs to be cleaned and washed every month, and maybe more often, it all depends on how much power it has petrol trimmer, as well as how often you use this device.

Gasoline trimmer (motor mower) carburetor repair does not work develops revs, loss of power

Description.

Petrol mower Not develops momentum.Another one cause

Chinese lawn mower Husqvarna analogue does not develop speed reason It turned out to be very simple (see video)

If you have completed the operations with the filter, but the operation of the trimmer powered by gasoline remains the same, the gas trimmer does not gain momentum, what should you do?

Then you should try to remove the filter from the device in order to provide the so-called “lightening” of the trimmer. Why the Chinese lawn mower does not develop speed is a good reason. It should help.

The next and quite common problem when working with a gasoline trimmer is that it simply stalls and does not show any signs of life.

In this case, the problem may be as follows:

The last and most common reason for a gasoline trimmer to break down is that the cable, which is located in the carburetor section, simply slept.

Therefore, make sure in advance that it is well tensioned, but not to the limit, otherwise if there is too much load on the gasoline trimmer, this small cable may crack and then you will definitely have to contact service center, and then also throw away a lot Money to the wind.

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Increased fuel consumption and rapid formation of carbon deposits on the trimmer spark plug when using a properly prepared fuel mixture indicate the need to adjust the carburetor. This describes the adjustment of trimmers with carburetors that have one screw for adjusting the fuel supply.

Carburetor adjustment

Before adjusting the carburetor, flush air filter. It is recommended to wash it after every 10 hours of operation. After this you can start making adjustments. The example photo shows the carburetor of the PRORAB-8406 petrol trimmer. The numbers indicate the adjusting screws that we will use.

Carburetor adjustment screws for petrol trimmer PRORAB-8406

Purpose of adjusting screws:

1. Fuel mixture supply adjustment screw.
2. Idle speed adjustment screw.
3. Limit screw maximum speed.

Start the lawn mower and wait until it warms up.

Fuel supply adjustment

Start slowly turning the fuel mixture adjustment screw until the engine starts to stall, or until it stalls if you don’t have time to catch the moment. After this, unscrew the screw a quarter turn if the engine does not stall, or half a turn if it does stall. Start the stalled engine. Check by opening the throttle to see how the engine picks up speed. Continue unscrewing screw No. 1 a quarter turn until the engine, when accelerating, begins to confidently gain increased speed. This will be the most economical moment stable operation engine. For the petrol trimmer PRORAB-8406, the adjusting screws are turned clockwise and unscrewed counterclockwise; for some other brands of gas trimmers it may be the other way around.

Idle speed adjustment

Let's start adjusting low speeds. Screw No. 2 limits the return movement of the lever throttle valve- by screwing it, we increase the idle speed, by unscrewing it, we decrease it. Adjust so that the engine runs confidently at low speeds and even a little faster (for better starting), but so that the reel with fishing line or the knife does not rotate, and there is a sufficient reserve of revolutions before they begin to rotate. If the engine is difficult to start, increase the speed by Idling.

Maximum speed limit

After adjusting the fuel mixture supply and low speed, check how the lawnmower engine will operate at maximum speed. If necessary, limit maximum speed to required level using a #3 hollow screw. Loosen the locking nut and screw in the screw to decrease the maximum speed, or turn it out to increase. After adjustment, tighten the nut. Setting the maximum speed is necessary to protect the trimmer motor from overheating and the ability to use the start key lock to reduce fatigue of the right hand.

In the future, it may be necessary to adjust the trimmer carburetor. For example, if the engine starts to rev poorly when running at full load, unscrew screw No. 1 another quarter turn. If starting is difficult, increase the idle speed. The operation of lawn mowers can also be affected by weather, and the quality of the fuel mixture. Vibration can cause the adjusting screws themselves to turn.

The spring may interfere

My first attempt to adjust the carburetor of the lawn mower did not yield anything, since the spring of the fuel mixture adjustment screw was in the way. The factory spring turned out to be too thick when compressed and did not make it possible to reduce the fuel supply to the required level. I had to pick up another spring and continue the adjustment after replacing it.

Fuel mixture supply adjusting screw with spring

In the photo above there is a factory spring, below there is an adjusting screw with a selected spring. I’m writing about this because I’m not sure that this is an isolated case and that someone else may encounter the same situation.

From personal experience

Petrol mower or trimmer

A trimmer is a broader concept than a lawn mower (motor mower), since it can also be electric. A gasoline trimmer and a gas mower are one and the same.

Some authors claim that a trimmer is a weaker tool, in contrast to a more powerful brush cutter, which can be used for mowing bushes. Personally, I have a tool with maximum power 1.7 kW and, as stated in the instructions, capable of mowing small bushes up to 10 mm thick. The user manual is called “Gasoline trimmer...”.

Fuel mixture proportion

I read somewhere that if the operating manual for the lawn mower and the oil canister indicate different proportions for preparing the fuel mixture, you should use the proportion indicated in the manual.

For a long time I did this - excess oil flowed from the engine onto the gas tank and carbon deposits constantly formed on the spark plug, since the manual indicated the proportion for a run-in engine was 1:25, and on the canister - 1:50. After switching to a ratio of 1:50, the appearance of oil drips stopped. The spark plug continued to burn, but with less intensity (the carburetor was not yet adjusted).

Until now, some users of gas-powered tools determine the proportion of the fuel mixture “by eye.” If the amount of oil is underestimated when preparing the mixture, after some time it may appear extraneous sound immediately after starting the engine, gradually disappearing during warming up, and stopping the engine occurs with with a sharp jerk. Continuing to operate the trimmer in this mode will result in its failure.

Cleaning the spark plug

IN worst times working with a trimmer with an unadjusted carburetor, the engine stopped starting after using each tank of fuel. And only after cleaning the spark plug from carbon deposits could work continue.

Fine sandpaper was used to clean the electrodes, and a thin paper clip with a bent end was used to clean the space between the insulator and the housing. First, the electrodes were wiped from large dirt with a rag, then cleaned with sandpaper. After this, the candle was lowered into diesel fuel and the moistened carbon deposits were scraped off with a paper clip from the surfaces of the insulator, the inside of the body and between them. Next, the candle was dipped into diesel fuel several times, which was then shaken off along with the dirt. Sometimes the paperclip cleaning and rinsing procedure was repeated. After this, the candle was wiped dry and was ready for further use.

Incredibly, one tank of fuel mixture with an unadjusted carburetor can be used up in less than 10 minutes - tested in practice when the trimmer was started and operated on high speed with maximum fuel supply (the adjusting screw was unscrewed much more than normal).

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The gas mower stalls

When purchasing a lawn mower, you need to be prepared for the fact that, like all other similar tools, it may also develop breakdowns that will require repair.

But you shouldn’t immediately run to the service center and pay a lot of money to the technicians who convince you that there is a serious malfunction in the device.

Petrol mower stalls on high speed on gas

Perhaps the most common complaint related to gas trimmers is: “The trimmer stalls.”

Naturally, the prerequisite for this may be a fairly severe malfunction. The lawn mower does not develop momentum. Another reason why the Chinese lawn mower does not gain momentum. The lawn mower does not develop speed, why the Chinese lawn mower does not develop speed. But in most cases the situation is even simpler than it seems at first glance.

To cope with such a problem, first try to figure out its causes on your own, because once you find out the reason, it’s even easier to deal with the problem, and from time to time it even self-destructs.

In essence, the circumstances are when the lawn mower stalls high speed, there are quite a lot of these circumstances.

Another one is the presence of defects in the power system.

In this case, the lawn mower will stall idle speed. It did not give any tangible result. Why the Chinese lawn mower does not develop speed. Why doesn't my lawn mower develop speed? Why does the lawnmower rev. I can’t get it off the ground. And it picks up speed from the floor. Misadjustment or incorrect adjustment of the carburetor can lead to dilemmas with the power system.

Why doesn't the Chinese lawn mower develops momentum?

Description.

Gasoline trimmer (motor mower) carburetor repair does not work does not develop rpm, power loss

Chinese lawn mower Husqvarna analogue does not develop speed, the reason turned out to be very simple (look in the video)

Misadjustment can be caused by vibrations that occur during the operation of the lawn mower.

Incorrect adjustment of the lawn mower can be corrected by simply adjusting it in accordance with the requirements specified in the operating instructions.

In addition, sometimes gasoline trimmers may stall due to the fact that the valve located in the gas tank cap is simply clogged or stuck.

To find out, try using a scythe while loosening the gas cap.

If the device operates properly in this mode, clean the valve.

A petrol mower is one of the main tools of a summer resident, used to quickly bring land plot in order. Owners of private houses also purchase this tool for mowing grass in their gardens. The period of active use of lawn mowers and electric trimmers falls in the summer. Before using the tool, bring it into working condition: rubbing parts are lubricated, the cutting set is changed, the fuel mixture is poured into the tank. If the engine does not start at all or stalls quickly without gaining enough revolutions, then you have to look for the causes of the problems and eliminate the identified problems. To repair a lawn mower with your own hands, you need to understand its structure and the operating principle of its main components. This information can be found in the operating instructions supplied with the garden equipment by the manufacturer. mandatory. Check for such a manual when purchasing a chainsaw. An imported tool must be accompanied by instructions written in Russian.

A long tubular rod is attached to the gearbox two stroke engine internal combustion. There is a shaft inside the rod that transmits torque from gasoline engine to the cutting mechanism. The line or knives rotate at a speed of 10,000 to 13,000 rpm. The protective housing of the gearbox has holes into which lubricant is injected using a syringe. For ease of use of the tool, the manufacturer equips it with a special adjustable strap that is thrown over the shoulder.

The cutting accessories are included with the lawn mowers:

• The fishing line, the thickness of which varies from 1.6 to 3 mm, is located in the trimmer head. When mowing grass, the line wears out. Changing fishing line is done quickly and easily in two ways: by winding fishing line of the same diameter onto a spool, or by installing a new spool with already wound fishing line.
• Steel knives with double-sided sharpening for trimmers for clearing the area of ​​weeds, small bushes, and coarse grass. Knives differ in shape and number of cutting surfaces.

A U-shaped, D-shaped or T-shaped handle attached to the bar contains the trimmer control levers. The cutting mechanism is protected by a special casing. Household brush cutters are fueled with a mixture prepared from gasoline and oil, which is poured into fuel tank. Device for semi-professional and household lawn mowers equipped with four-fold gasoline engine, slightly different. The refueling scheme is also different: oil is poured into the crankcase, and gasoline into the tank.

The measured piece of fishing line is folded so that one end is 15 cm longer than the other. We insert the loop into the slot on the reel and begin to wind in the direction indicated by the arrow

What to do if the engine does not start?

If you cannot start the lawn mower, then the first thing you need to do is check the presence of fuel in the tank and its quality. To refill the tool, it is recommended to use high quality gasoline, purchased at gas stations, the grade of which must be no lower than AI-92. Saving on cheap fuel can lead to cylinder failure piston group, the repair of which can take a third of the cost of the lawn mower itself. It is equally important to cook properly fuel mixture from gasoline and oil. The proportional ratio of these mixture components is indicated by the manufacturer in the manual. You should not prepare the fuel mixture in large volumes, as its properties are lost during long-term storage. It is better to use a freshly prepared mixture.

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

Pollution fuel filter in the tank may also interfere with the operation of the trimmer engine. Therefore, if you have problems starting the engine, check the condition of the filter. If necessary, replace the filter. Do not leave the inlet pipe without a fuel filter.

The air filter also needs checking. If the part becomes dirty, remove it field conditions washed in gasoline and put in place. At the dacha or at home, the filter can be washed in water using detergents. After this, 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 installed in place. The removed cover is put back and secured with screws.

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

How to do it this procedure You can watch the video in more detail:

If all of the above procedures have been carried out, but the engine does not start, then adjust its idle speed by tightening the carburetor screw. The video posted at the beginning of the article focuses on this issue.

So, in order:

1. Place the tool on its side so that the air filter is at the top. With this arrangement of the chainsaw, the fuel mixture reaches exactly the bottom of the carburetor. The engine will start on the first try if you remove the air filter before starting and pour a few drops of the mixture into the carburetor, then install the dismantled parts in place. 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 functionality, and also dry the combustion chamber. Replace a 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 method of starting the engine. Close air damper carburetor 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 people pull the handle so hard that they have to repair the lawnmower starter 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 assembled.

How to properly replace a spark plug?

The work order is as follows:

• Stop the engine and wait until it cools down.
• Disconnect the high voltage wire from the spark plug.
• Unscrew the part using a special key.
• Inspect the spark plug for replacement. The part is replaced if it is faulty, heavily soiled, or has a crack in the body.
• Check the gap between the electrodes. Its value should be 0.6 mm.
• Tighten the new spark plug inserted into the engine with a wrench.
• Install the high-voltage wire on the central electrode of the spark plug.

As you can see, there is nothing super complicated in this procedure.

A new spark plug for a two-stroke internal combustion engine of a gasoline spit is installed to replace old part, out of order

Why does the lawn mower stall after starting?

After starting, the engine may stall if the carburetor is incorrectly configured or misadjusted. By what signs can we understand that the reason really lies in this? It’s very simple, based on the vibrations that will be clearly felt when the mower is operating. You can adjust the fuel supply yourself by following everything that is written in the operating instructions for the tool.

The engine may stall due to a clogged fuel valve. The cause can be eliminated by cleaning it. If the lawn mower starts up and then suddenly stalls, it means that the supply of fuel to the carburetor is obstructed. Loosen the carburetor valves to ensure free flow of fuel in the required quantity.

Excessive air leaks may also cause the engine to stall. Increase the engine speed to allow air bubbles to escape faster. fuel system unit. Also be sure to check the integrity of the fuel intake hose. If found mechanical damage(cracks, punctures, etc.), replace the part.

How to clean and store the instrument?

During operation of the lawn mower, monitor the condition of the engine cooling system. The channels in the starter housing, as well as the cylinder fins, must always be clean. If you ignore this requirement and continue to use the brush cutter, you can damage the engine due to overheating.

Proper care of a gasoline scythe during operation allows you to use it for several seasons in a row without major repairs.

Allow the engine to cool before cleaning. Take a soft bristle brush and scrub away any dirt from the outer surface. Plastic parts are cleaned with solvents, including kerosene, or special detergents.

At the expiration of summer season The lawn mower must be prepared for long-term storage. To do this, the fuel mixture is drained from the tank. Then the engine is started to exhaust any remaining fuel in the carburetor. The entire instrument is thoroughly cleaned of dirt and sent to “hibernate.”

As you can see, you can repair malfunctions of a household lawn mower entirely on your own. You should contact customer service if serious damage. In this case, you should compare the cost of repairs with the price of a new lawn mower. It may be better to buy a new tool.

While caring for their garden plots, summer residents periodically encounter the problem that the lawn mower does not start. There are many reasons for tool failure. To correctly diagnose the problem, the owner of a useful unit at the dacha needs to know the structure and operating principle of its individual parts.

Since a gasoline trimmer is a complex device, you must carefully study the operating instructions before starting work. Very often they simply ignore her, or get to know her superficially. As a result, when the tool stalls or refuses to start, the question arises: “Why won’t the lawn mower start?” A long seasonal break in work, improper storage and untimely maintenance of the trimmer will cause a lot of trouble for the summer resident to eliminate the causes.

Where to start diagnosing a lawn mower

If the lawn mower does not start or stalls immediately after starting, it is necessary to sequentially check all the main components and assemblies. The verification algorithm is as follows:

• Fuel tank (fuel quality);
• Candle and candle channel;
• Air filter;
• Fuel filter;
• Breather;
• Exhaust channel.

These nodes are most often the source of the main problems, which can be eliminated after a thorough inspection.

Checking the fuel mixture

Before starting the gasoline scythe engine, check the availability and quality of the fuel mixture. Don’t save money, don’t be greedy, and don’t be “clever” in this matter. Repairing or replacing the piston group will cost you too much (sometimes up to 70% of the cost of a new tool). The oil-fuel mixture must be prepared strictly according to the instructions. Calculate its quantity based on real needs. The excess gasoline remaining after work loses its quality over time.

We diagnose the spark plug and spark plug channel

If the quality of the fuel mixture is not in doubt, and the lawn mower stalls when starting, then the cause may be a flooded spark plug. Here for repairs regular will do spark plug wrench(surely every motorist has one) and a spare spark plug.

• We unscrew the candle and wipe it;
• Dry it thoroughly (do not heat it);
• Excess fuel in the chamber is drained through spark plug hole and dry it;
• We clean the old candle from carbon deposits using a file or a lady’s nail file;
• We set the gap with a distance of 1 mm (you can check it with any coin);
• We return everything to its place and try to start the trimmer.

You need to dry the canal for at least 30–40 minutes. Otherwise, there is a risk of re-filling a new spark plug.

If the spark plug is working, the socket where it is located is completely dry, and the lawn mower does not want to start, lubricate it with gasoline threaded connection. It should be slightly moist. No matter how wonderful a spark a candle produces, there is simply nothing to light up in a dry chamber.

If the trimmer engine still does not start, you should exclude a reason such as lack of spark due to poor contact between the spark plugs and high voltage wire. If the connection is good, but there is still no spark, most likely your ignition unit has failed. Here you won’t be able to do without a specialist, since the part is not repaired, but sold as a single unit.

Diagnostics of lawn mower filters

Another reason why a gas scythe stalls may be the air filter. To eliminate this, try removing the filter and starting the trimmer without it. If it works out, then you will have to change the air filter to a new one, or at least blow out and thoroughly clean the old one.

A gasoline trimmer may not start due to contamination of the fuel filter. This is the next stage of our algorithm. Here we check the condition of the filter element and, if necessary, replace it with a new one. When replacing, try not to leave the suction pipe completely without a filter; this is prohibited by any operating instructions. Haste can result in repair of the engine piston group.

Breather and exhaust channel

Often, “delicate” branded models of lawn mowers do not start and stall due to contamination of the breather. The main function of this element is to equalize the pressure in the gas tank. When this unit becomes clogged, a vacuum is created in the tank, preventing the supply of fuel. The problem can be resolved by cleaning the breather. You can use a regular needle for cleaning.

The normal operation of scythes with internal combustion engines may be disrupted due to dirt getting into outlet channel or clogging of the muffler mesh. This problem occurs on older generation models. The issue can be resolved by traditional cleaning and removal of the anti-spark mesh.

More complex reasons for lawn mower failure

If step-by-step algorithm troubleshooting has not yielded results, and your scythe still does not start or stalls, it is worth inspecting the carburetor and the engine itself. A clogged carburetor can be one of the reasons for unstable operation of the tool. There are three main problems here:

• Clogged channels or jets. All this is cleaned with special washes or blown with a powerful jet compressed air from the compressor. Do not use needles or wire, as the bores may be damaged;
• Worn carburetor gasket. The solution is to replace the failed gasket;
• Violation of tightness. To check this indicator, you can use a regular household tonometer, replacing the pressure gauge with a suitable one. Keep an eye on the readings: if they do not change, everything is fine, but if the pressure starts to drop, it means that some part of the carburetor is faulty. You'll have to find it and replace it with a new one.

If everything is in order with the carburetor, then the gasoline trimmer may not start due to wear on the piston group. If chips, scratches or burrs are found on the piston or cylinder, they should be replaced. Subject to mandatory verification piston rings. A slight luffing of the piston when the connecting rod swings indicates that it is time to change the rings. This procedure is best left to the service center specialists.

Rules for operating and storing lawn mowers

In order for the lawn mower to start well in the future, you need to provide it with good conditions storage and operation:

• During operation, carefully monitor the cooling system, carefully and promptly clean the channels in the housing, as well as the starter fins;
• if necessary, use solvents, kerosene and other detergents for cleaning;
• Do not clean the tool “hot” - let it cool;
• strictly follow the operating instructions, otherwise you may overheat the engine;
• if you do not plan to use the lawn mower in the next month, you need to drain the fuel mixture from it, because over time it breaks down into heavy fractions that will definitely clog the carburetor channels;
• After draining the fuel, let the trimmer idle until it stalls, this will help completely remove the remaining working mixture.

Before winter storage do the following steps:

• completely disassemble the braid, rinse and clean all the parts you can;
• inspect the parts for damage, if necessary, eliminate distortions, tears, bends and any other defects;
• fill in sufficient quantity oil into the gearbox and clean the air filter;
• you can partially disassemble the motor, wash, blow and lubricate all moving parts;
• in order to lubricate the piston, you need to unscrew the spark plug, use the starter to raise the piston to the outermost dead center, pour a little oil into the spark plug hole and rotate the crankshaft a couple of times;
• If you store the lawn mower outside the house, wrap the engine with oily rags.

Remember, careful adherence to the rules will allow you to forget that it is difficult to start a lawn mower for several seasons.