Gasoline Lawn Mower Starts And Stalls Cause

The chainsaw starts and stalls. Why?

There are several simple rules for the operation and maintenance of a chainsaw, the observance of which will allow you to maximize its service life. Preparing the correct fuel mixture, regularly cleaning filters and periodically replacing parts will save you from having to repair your tool for a long time. If it was not possible to avoid the breakdown, then you can figure out its cause completely independently. This applies to any brands of chainsaws, ranging from the more complex models “Husqvarna” and “Stihl” and ending with the simplest models “Makita” and “Patriot”.

Chainsaw stalls under load

If the chainsaw stalls under load, then the fuel system or a dirty air filter may be a prerequisite for that. Replacing the fuel with the correct gasoline / oil ratio or cleaning the air filter are universal solutions. An improperly prepared mixture of low-quality gasoline and, for example, engine oil is the main reason for the malfunctioning of a chainsaw, including in the case when it heats up and stalls.

Chainsaw stalls when tilted

When the chainsaw is horizontal, the fuel pipe lies at the bottom of the gas tank, but when the tool is tilted, the pipe is above the fuel mixture, i.e. In the air. This is precisely the precondition that the chainsaw stalls on its side.

The chainsaw stalls immediately

What to do if the chainsaw stalls immediately after starting? First you need to check the presence of fuel in the gas tank. If its level is not enough, then it is necessary to prepare the fuel mixture in strict accordance with the ratio of gasoline and oil prescribed in the operating instructions. Gasoline must have the highest possible octane number, and the required brand of oil, as a rule, is indicated in the data sheet of the chainsaw.

Next, we check the spark plug, as well as the contact of its tip with the high-voltage wire. The gap between them should be no more than 0.5 mm. If necessary, the candle is cleaned of carbon deposits and dried. It is recommended to occasionally change the candle to a completely new one. The reasons for the tool stalling when you press the gas lie in the fuel filter or carburetor jet. Cleaning the gas filter will NOT take much time and effort, but it is better to entrust the disassembly and cleaning of the carburetor to the specialists of the service center.

Chainsaw stalls at idle speed

Cases are common when the chainsaw stalls at idle. First of all, you need to check the muffler, and, if it is dirty, clean it from the exhaust tar deposits. Also on carburetors of some models and others. There are bolts marked H and L. coarse and fine tuning respectively. By adjusting the bolt L during the operation of the chainsaw in such a way that its speed increases (the bolt is only turned half a turn), it is possible to eliminate this problem. Adjusting the carburetor requires an electronic tachometer and is a rather time-consuming process. That is why, in such cases, it is better to turn to professionals.

The chainsaw stalls at high speeds

In the event that the tool stalls at high rpm, there are three parts to check: the air filter, the fuel pump, and the gasoline filter. The air filter must be cleaned, you can even wash it under water and dry it thoroughly. Then it is enough to disconnect the fuel hose from the carburetor and see if fuel flows out of it or not. If it flows in full stream, the petrol filter need not be checked. If, on the contrary, the fault has been found. The breather can be cleaned with a regular needle, and the filter can be carefully disconnected from the suction hose, cleaned or replaced with a new one. The gasoline pump is checked for wear: if fuel does NOT seep through it, then everything is fine with it. If the problem that your tool stalls at full speed is due to some damage to the pump, then this part just needs to be replaced with a new one.

When the air damper is opened

It happens that the unit stalls when the air damper is opened, working normally at idle speed. This is due to air leaks in the system, caused by cracks in the fuel hose or problems with the oil seals. The carburetor metering system may also malfunction, and the lawn mower will stop after opening the damper.

Fuel hose to carburetor

For all Possible causes of the lawn mower stalling and solutions, see the following

There are many reasons for stopping lawn mowers, but the most common malfunctions associated with its carburetor. They can occur in any case. The most problematic option is when a serious breakdown occurs, and you need to purchase new parts or change the lawn mower.

Why the lawn mower stalls?

Every gardener invariably faces problems related to the operation of garden equipment. In this article we will answer the question why the lawn mower stalls and how to cope with this problem.

Note that depending on what kind of machine, gasoline or electricity, you cut the grass, the solution to the problem will depend.

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Only after the above steps have NOT been performed and the carburetor crankcase is tightened, you can proceed with carburetor adjustment.

The reason for this algorithm is that if the crankcase air supply has not been eliminated and the carburetor is simply adjusted before normal engine operation, the fuel mixture will contain more fuel than the sealed crankcase requires, which in turn will significantly increase its consumption. In addition, carbon may appear in the engine, which will also adversely affect the further operation of the chainsaw.

In some models of chainsaws, special hoses are installed to support the fuel pump, which transmit air impulse from the crankcase to the fuel pump of the carburetor. If this hose is broken, the saw will stand idle and will not operate at all under load.

When heated

the lawn mower often stops when it heats up. At the same time, it starts up, works “with a jerk” and gradually stops. This process occurs when the gasoline in the carburetor boils or the damper is installed in a rotary rather than a disc type. In the latter case, the part is changed.

It happens that the trimmer heats up if the ignition circuit wire or coil is damaged. In order for the device to start working normally, replace parts.

Why does the petrol trimmer stall

A scythe with a gasoline drive is a useful thing for owners of home gardens, lawns, and when the trimmer suddenly stalls, the work on clearing the area from grass stops. The device itself is a rather complex mechanism, so there are many different reasons for its breakdown. The most common problems are contained in the operating instructions. Knowing the reasons why the trimmer stalls should be done in order to effectively repair the device yourself.

Gasoline Lawn Mower Starts And Stalls Reason

Chainsaw owners sometimes have to deal with the fact that the saw stops working properly for no apparent reason. To understand why the chainsaw stands in different operating modes, and to describe how to diagnose the malfunction, we will try in our article.

Why are chainsaws when heated

The situation when the chainsaw freezes and can stagnate during heating is familiar to many who come across them. The main reasons for this behavior were seen in the following.

Defective ignition module (coil). You can identify the problem by testing the spark first on a cold engine and then on a hot one. If sparks are present on a hot engine, try to correct the problem by replacing the ignition coil.

You can check the ignition coil with a multimeter or replace it with a well-known working one. The multimeter checks the primary and secondary windings in resistance measurement mode. The resistance index of the primary winding, working coil, is 1 kOhm, secondary. 4 kΩ.

DIY lawn mower repair

Many owners of gasoline lawn mowers sooner or later face technical problems with this technique. Most often, problems arise after three to four seasons of active use of the lawn mower or after the equipment spends the winter in a not very heated garage. These problems manifest themselves as follows:

• Lawn Mower Will Not Start
• The lawnmower starts, but soon stalls
• Lawn mower engine runs intermittently
• Lawn mower engine is not running at full power

It doesn’t matter which engine is on your mower: an expensive Japanese Kawasaki or a simple Chinese Lifan, over the years of operation these problems are more likely to appear in all lawn mowers. However, it is worth getting upset and rushing to take your mower to a service center. In the vast majority of cases, lawn mowers can be repaired by hand without much difficulty. In this article we will show you step by step how to do it.!

Gasoline Lawn Mower Starts And Stalls Reason

Owners of HUSQVARNA 137 and HUSQVARNA 142 chainsaws should first check the impulse hose for abnormal engine operation as this is considered the most common cause of failure of THESE chainsaws.

, showing how to replace a faulty impulse hose with your own hands with a HUSQVARNA 142 chainsaw can be seen below. It goes through the process of disassembling the saw, shows the impulse hose and causes the consequences of its malfunction HUSQVARNA 142.

lawn mower Will not start, spark has disappeared

The loss of a spark entails checking the contacts and the correctness of the gap between them, the conducting wire to the candle and the candle itself.
Spark check method. Unscrew the spark plug, connect a wire to it, put the spark plug sideways to the engine casing and pull the starter several times as if Starting the lawn mower, while looking at the Coal and the spark plug contact, there should be a spark between them.
If there are sparks, take a new candle, do the same procedure, if the spark is NOT traced, then the problem is in the wire or contacts, it is better to replace them.

lawn mower Will not start after winter

In such cases, the unit must be serviced. Remove the fuel system, including filters (air, fuel), disassemble the carburetor, clean and rinse each unit. Blow out the filters with air. Pay attention to fuel quality and octane number.

It should be noted that the products of such well-known companies as STIHL, Husgvarna and other brands will not work on cheap gasoline with a low octane number.
For them, fuel from the AI ​​brand. 92 and above is suitable from automobile gas stations and then from well-recommended ones, since there is also bad gasoline at gas stations. Here are the applications 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 with a long storage of a diluted fuel mixture, working qualities fall into it, which also leads to the consequences in which the lawn mower does not start. Therefore, it should be diluted in portions, that is, the amount of mixture that is produced at a time.
The operating instructions clearly describe and explain the mixing ratio of gasoline and oil. Strict observance of the correct proportions will at least save you from several questions, why the lawn mower does not start and what to do in such cases.

lawn mower Will not start on a cold

When starting a cold engine, it is not recommended to press the gas. Tilting the 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 cord several times until the engine starts. After a few seconds of engine running, disable the starting system.

The lawn mower will not start, or will start 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 a new saw just bought does not start, and it starts running around the service centers, in such cases it is recommended:

Read the instruction manual carefully;
study in detail the method of first starting and running in lawn mowers;
try to understand how the product works;
how is pumping gasoline and so on.

Causes of malfunctioning lawn mowers:

The quality of the gasoline is poor;
incorrect proportion of gasoline and oil;
clogging of the fine filter;
the spark was gone.

the lawn mower starts and stalls. What to do?

There is a spark, and everything seems to be normal, but the lawn mower will not start, in such cases you should check the air inlet valve to the fuel tank. A clogged valve leads to the creation of a vacuum in the tank, in which the carburetor does not receive enough gasoline, so the lawn mower will start, but then stall. To exclude this reason, you need to clean the valve and try to start the lawn mower C with an incompletely twisted tank cap.
2. If the lawn mower does not start at the same time, remove and clean the fuel filter, as well as check all carburetor parts, and then try to start. Again The lawn mower will not start, the air filter is disconnected, try to start without it, if the mower starts, then the reason is in the air filter, replace it.

lawn mower Will not start when hot

If the 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 cord sharply several times, until the engine starts and only then the gas trigger is released. If enough time has passed and the lawn mower has cooled down, then it should start 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.

The engine does NOT pick up or keep revving

The most common reasons why the engine is NOT revving up are:

• Incorrect position of the choke lever or breakdown of its drive;
• Dirty air filter;
• Faulty manual accelerator control system.

At home, without special equipment and skills, you can only check:

• Air filter condition;
• Choke lever operation (only on models where the choke position is manually adjusted)
• Manual accelerator control system, that is, a special lever on the folding handle and a cable connecting it to the carburetor.

Checking the condition of the air filter and flushing it is described in detail in the mower’s operating manual, and we analyzed the check of the throttle position regulator in the previous section.

To check the manual accelerator control system, you must set the lever to such a position where the engine speed will correspond to the required for mowing, then mark its position with a marker and, after waiting for them to decrease, compare the position of the lever to the mark.

If the lever matches the mark, then the problem is much more serious and you need to contact the service, if the lever has moved, then you need to replace it.

Some inexpensive Chinese devices are supplied with a factory defect, including an incompletely assembled air damper actuator or its incorrect adjustment.

Many modern lawn mowers are equipped with automatic speed control, so they can only be diagnosed in a workshop.

Does not stop

This happens in two cases:

• The cable connecting the wheel drive bracket and the bearing squeezing out the belt is sticking or nitrous;
• Lost adjustment of the wheel drive cable.

The cable starts to jam if stored improperly or part of the mowing of wet grass, when moisture penetrates into the braid and corrosion forms there.

Such maintenance is preferably carried out annually, regardless of the cable jam, only the volume of oil must be reduced by 2-3 times. This will protect the inside of the braid and the core from moisture, which will make the cable last much longer. If this does not help, then it is necessary to adjust the actuator as described in the operating instructions.

Most common problems

Here are the most common faults:

• The engine will not start;
• The motor stalls arbitrarily;
• The engine does NOT pick up or keep revving;
• Immediately after the start of mowing, the engine speed drops and it stalls or works intermittently;
• Smokes heavily;
• Bad rides;
• DOES NOT stop even after operator releases wheel drive lever;
• Shakes violently;
• Cuts grass poorly.

In this, the author shows a step-by-step inspection of the lawn mower and how to fix problems with the drive of a self-propelled machine:

Shaking violently

Such a malfunction of a gasoline lawn mower occurs in two cases:

• When the knife is deformed due to hitting an obstacle;
• If the knife is sharpened incorrectly.

In both cases, the prerequisite for shaking is the lack of balance of the knife, because upon impact, the knife is at least slightly deformed, and if the sharpening is incorrect, the metal is removed unevenly on both sides.

As a result, a lever is formed, the length or mass of the arms of which is at least slightly, but different. This leads to the fact that the motor shaft will always pull after the heavier or longer arm of the lever, and due to its rotation, such a force will also move in a circle.

In order to determine the cause, it is necessary to prepare and set the petrol lawnmower in the position for changing the blade (these operations are described in detail in the operating instructions). Then the knife is carefully examined in search of damage, if the external examination did not give anything, then it is removed and balanced.

When self-balancing, the knife is put on the bar and they see which side will go down, for more accurate balancing, you can slightly wiggle the knife on this makeshift shaft.

Having determined the heavier side, it is gradually grinded with a file by hand or on a sharpening machine, constantly checking the balance, and the metal is removed only from the side of the blade, maintaining the original sharpening angle. In the same way, the knife is sharpened at home, first with sharp blades, then balancing it.

On some models of gasoline lawn mowers, the cause of the shaking may be a broken adapter between the engine shaft and the blade, which protects the shaft from damage in a collision.

To diagnose such a malfunction, it is necessary to set the device to the position for replacing the knife, then shake the knife in different directions and try to rotate it.

If it sways or turns even a little, the adapter needs to be changed. after all, it has fulfilled its task, protected the shaft when the knife stops abruptly, so that it can no longer reliably fix the knife. Its replacement is also described in the instruction manual.

Initial inspection

To establish the real cause of this defect, you must first conduct a complete visual inspection and make sure that the air filter or muffler holes are NOT clogged, there is gas in the tank, and the throttle lever and ignition switch are in the correct position.

If everything is in order with this, then it is necessary to perform pre-start work, including cleaning the air or fuel filters, described in detail in the mower’s operating instructions, and then try to start.

After making sure that the engine still does not start, the mower is placed on the table and proceeds to a more detailed search for the reasons.

First, unscrew the spark plug and tightly plug the spark plug hole with your finger, then smoothly but quickly and strongly pull the recoil starter cable or press the electric start button.

The moving piston must create enough air pressure to push the pin through and out. If this does not happen, then the motor needs serious repairs, which is difficult to do at home, so it is better to take the mower to a specialized workshop.

After all, the premise that the piston does NOT move following the starter cable or the rotation of the electric starter shaft may be:

• Starter failure, due to which it does not transfer rotational energy to the engine shaft;
• Sheared flywheel key that links the flywheel and starter to the engine and also ensures the correct firing angle.

To eliminate both faults, not only tools are needed, but also skill, therefore, for those who do not have the skill of repairing any engines, it is better not to try to fix such problems yourself.

Further verification

If the piston moves, then you must first check the fuel supply, for which the spark plug is thoroughly wiped with a dry clean cloth, then screwed into place, and the air damper position regulator is set to the “Off” position, as when starting the engine.

Then the choke lever is placed in the “On” position and the candle is unscrewed, which is carefully examined.

Wet contacts indicate that gasoline is entering the engine and an ignition problem, while dry contacts indicate:

• On carburetor models in a faulty carburetor;
• On mower with fuel injection malfunction of the entire fuel system.

In both cases, knowledge and equipment are required for correct diagnostics and repairs, so for those who DO NOT understand such work, it is better to take the device for repair to a specialized workshop.

If fuel is supplied, then it is necessary to check the external condition of the ignition coil and high-voltage wire. If they have cracks or poor contact both between the manual and the coil, and at the junction of the wire with the spark plug tip, they must be replaced.

If everything is fine, then you need to check the Spark, for which you can use both a known-good candle and a bolt of a suitable diameter, which is inserted instead of a candle into a high-voltage wire.

The candle is threaded against the ribs of the engine cooling jacket, and the bolt is positioned so that it does NOT come into contact with the mower body or its engine anywhere, and the distance from it to the cooling jacket was 1-2 mm.

After that, disconnect any wire going to the ignition switches, then pull the manual starter lever several times or press the electric button and see if a spark appears.

If there is a spark, then the device will not start for one of the reasons:

• Breakdown or breakage of the ignition coil;
• Flywheel key cut;
• The ignition magnet fell off the flywheel.

To repair THESE damage skills and equipment are required, so those who do not have them are better off trusting professionals. If there is a spark, then the problem is in the spark plug, so after replacing it, the engine will start working.

The mower emits a lot

The reason the mower smokes may be due to the following:

• The fuel tank was filled with gasoline prepared for two-stroke engines, or it was stored in an oil container;
• The air damper position regulator is faulty or is in the “Off” position;
• Oil level too high;
• The mower, filled with oil, was stored vertically.

To check gasoline, it is drained, then obviously clean fuel is poured, corresponding to the octane number, after which the engine is started and the grass is mowed. If after 5-10 minutes the gasoline lawnmower has not stopped smoking, then the problem is something else.

If the smoke has disappeared, then it is advisable to replace the spark plug, and in the future, more carefully approach the choice of fuel for the lawn mower.

In this case, it is not enough just to pump out the excess oil, because the oil seals have already been pressed through, which means that the mower will begin to actively consume oil, which, when burned in the engine, forms dark smoke.

Therefore, it is advisable to contact a specialized workshop, where they can check the condition of the engine (oil entering the cylinder negatively affects many of its parts), and also replace the crushed oil seals.

If the lawn mowers were stored with oil filled in and in an upright position, then you need to contact the service to replace the oil seals and revise other parts, and also more carefully read the operating instructions and follow the rules for storing the machine outlined in it.

Petrol Lawn Mower Malfunctions: Common Problems and Their Solutions

Like any motorized technique, the lawn mower sometimes breaks down and stops working or does not work properly.

over, there is always a specific reason why the equipment works intermittently, without eliminating its repair will only lead to a senseless waste of finances and time.

Having understood the device of the lawn mower and the reasons for the breakdown of certain mechanisms, in most cases it is possible to eliminate them yourself.

In this article, we’ll cover:

• The most common malfunctions of gasoline lawn mowers;
• The reasons for THESE malfunctions;
• Diagnostic methods;
• Ways of repair and prevention.