Lawn Mower Does Not Start

The petrol lawn mower will not start The petrol lawn mower will not start. Why?

The lawn mower won’t start

If at the first start, your new lawn mower refuses to start, try the following: based on the air temperature outside, set the appropriate air damper position (at temperatures less than 30 C, the damper is closed, over 30 C half-closed position), then pump fuel into the carburetor and carefully, but pull the starter handle rather sharply until you feel some resistance. Repeat these steps in the same sequence several times. A brand new instrument must start. If this finally happened, you can safely start working by opening the damper completely beforehand.

If the mower is no longer new, then it is necessary to start its inspection from the gas tank. If the device has not been in operation for a long time, then it is necessary to drain off the old gasoline, which has a peculiarity of running out, i.E. Lose its octane properties, and refill with fresh fuel mixture. The gasoline / fuel ratio, as well as the required grades, are usually indicated in the operating instructions for the tool.

Now you need to check the spark plug, either the problem is in it or in the fuel system. The candle must be carefully unscrewed and its condition evaluated. If the candle is heavily flooded or there is black carbon on it, then it must be removed, cleaned and dried. Drain the excess fuel, if any, from the spark plug holes, drain the cylinder itself, then screw in the dried or, even more desirable, a completely new plug. If the plug was completely dry initially, you need to look for a problem in the fuel supply system. Check the fuel filter first. To do this, disconnect the suction hose and remove the dirty filter from it, clean and reinstall it, or replace it with a new one. If this does not help, you should contact the service center specialists.

Will not start after winter

In this case, you just need to drain the old and, possibly, even frozen fuel and fill in the freshly prepared mixture. Then you need to perform the same manipulations as during the first start of the lawn mower.

Starts up and stalls

If the mower stalls after starting, check the air filter. When this filter is heavily clogged with dust, it stops passing the required amount of air into the carburetor and allows dust to enter the fuel mixture. It is necessary to carefully remove the contaminated filter, clean and rinse in gasoline. If the air filter is clean, and the tool still stalls, then it is better to contact a professional to determine the cause of the malfunction and eliminate it.

The mower will not start due to poor fuel supply

When your petrol lawnmower will not start, the first step is to check for fuel in the tank. If it is missing, add it to the required level.

Another very popular option that the lawn mower engine will not start is a problem with the gas tank plug valve. If the valve is clogged on it or does not work, then the pump simply cannot pump fuel.

The mower may not start if the position of the air flap is incorrect during the first start. Depending on the air temperature, it is completely closed or set to the middle position (above 30 C). Then it must be fully opened.

The mower may not start if the air filter has poor air flow due to contamination. To fix this problem, you need to remove the filter and clean it. If the filter is heavily soiled, it must be replaced.

A common reason for the inability to start the mower engine is a problem with the carburetor, most often it is simply clogged with dirt and the remains of low-quality fuel. It is necessary to flush the carburetor and adjust the fuel mixture supply.

The mower won’t start, what should I do?

Lawn Mower Does Not Start

The lawnmower will not start the cause of the malfunction

A gasoline lawnmower may not start for three groups of reasons:

  1. Power system problems;
  2. Ignition system problems;
  3. Problems in the cylinder block.

List of Reasons Your Gasoline Lawn Mower Won’t Start

The reasons for the malfunction of the lawnmower may be as follows:

  • Insufficient fuel level in the tank,
  • Fuel line malfunctions,
  • The air filter is clogged,
  • The gas tank plug valve does not work,
  • Incorrect position of the air valve,
  • The spark plug does not work,
  • No voltage is applied to the spark plug,
  • Clogged carburetor
  • Lack of engine compression.

If you cannot fix the problems yourself, you need to contact a service workshop for the repair of lawn mowers.

Lawnmower will not start due to poor ignition system

Another reason your petrol lawnmower won’t start could be a faulty spark plug. The spark plug must be removed. Clean it and adjust the thermal gap.

A frequent breakdown leading to problems with starting the engine may be incorrect starter operation. It is necessary to check the correct position of the starter, the correct winding of the cable. Make sure that the starter provides voltage during operation.

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Your lawnmower will start the first time!

We accept for repair lawn mowers: Stihl, Husqvarna, Hater, Hyundai, Makita, Partner, Patriot, Ryobi, Alpina, Daewoo, Efko, Fubag, Graphite, Hitachi, Makskat, MTD, Oleo-Mak, Patriot, Sparky, Storm, Tsunami, Bison, Master, Caliber, Honda, Oleomak, Huuter, Devolt, Bosch, Steel, Carver, Mobile, Parma, Stavr.

The company Alfa-Rost performs urgent high-quality repairs of lawn mowers at low prices in Rostov and the Rostov region. We carry out all the necessary list of work on the repair of lawn mowers and other gasoline equipment and tools. We will troubleshoot your equipment and your lawnmower will start well.


Hand lawn mowers (trimmers) fit for regular lawn mowing in a small area even with an uneven surface, because they can mow at any angle. The trimmer is a bar-holder, at the lower end of which there is a cutting device with a line. And in case of high power, also with a circular cutter. The mower hangs on a belt on the operator’s shoulder, literally making it easier for him to work.


The trimmer can be equipped with electric or gasoline engine. Electric is located at the lower or upper end of the boom, and gasoline only at the upper end.

The protective cover limits the cutting edge and protects the mower’s feet from injury. When working, the left hand holds the boom handle (adjusting, if necessary, the cutting height), and the right handle with the engine control button.


The main advantage of trimmers the ability to mow grass in uneven areas and close to bushes and trees. However, it will not be possible to maintain the same cutting height.

What are lawn mowers and how to choose the right one

Creating a beautiful lawn and keeping it in order is not an easy job. And to make it easier, you need a reliable lawn mower assistant. There are many good and different models on sale. And although they all have the same purpose, they differ from each other in a number of parameters. Let’s try to figure them out.

Lawn mower

Electric trimmers

The electric trimmer is operated from a household electrical outlet. To his merits can be attributed:

  • Light weight,
  • Environmental friendliness (no exhaust gases and noise).

Disadvantages of an electric trimmer:

  • Connection to the network (outlet),
  • The presence of a stable voltage,
  • The always interfering cable on the lawn,
  • Low power.

And the cable itself has a limited length: you can’t mow far from home.

Electric trimmer

Battery trimmer the same as an electric one, but the motor does not work from the outlet, so you can mow at any distance from the house. This is his basic convenience. However, the mowing area is determined by the capacity of the battery.

What kind of lawn mowers are there?

By way of movement lawn mowers are divided into:

  • Manual (trimmers), which are held in hand when mowing,
  • Wheeled manual ones that need to be transported on the lawn,
  • Self-propelled.

By type of drive motor distinguish mechanical, gasoline and electrical lawn mowers.

Mechanical wheeled lawn mowers easy to operate, no electricity or gasoline is needed, but considerable muscular effort is required. They are environmentally friendly, quiet and allow you to adjust the cutting height of the grass. The cutting mechanism is a cylindrical knife driven by wheels. Such a tool is good for caring for a young lawn, since the low speed of rotation of the knife prevents pulling out grass with a fragile root system.

Mechanical wheeled lawn mower

And we will consider gasoline and electric lawn mowers below.

Petrol trimmers

The petrol trimmer is designed for large areas. Therefore, it is especially in demand by summer residents, and owners of country estates, and employees of city utilities.. However, working with it requires some preparation.

Petrol trimmer

This type of lawn mower has an enviable mobility, increased power and practicality. It can be used to mow not only lawn grass, but also weeds and bushes. And professional models are able to cut stems up to one and a half centimeters thick.

However, even with a small fuel tank volume, such a unit:

  • Weighs quite a lot,
  • Requires the preparation of a mixture of gasoline and oil,
  • Pollutes the environment with exhaust gases,
  • Makes noise.

But it can work in any weatherat.

Ease of mowing grass with a trimmer is determined by several points, and one of them is the location of the engine.

Trimmers bottom engine on sale a lot. Most often they rechargeable, low power. They overheat quickly, so they require frequent breaks in work. They have poor protection against moisture and mechanical stress. They cannot work in the morning dew and immediately after rain, otherwise a short circuit is possible.
Bottom trimmer

Trimmers top engine more practical, more correctly balanced and more powerful, require less effort for mowing, which means more comfortable operation. They have good cooling (they overheat less) and, therefore, more performance.

Top Engine Trimmer Among the top engine trim tabs, we would like to highlight knapsack. Their motors are attached to their backs (like a schoolbag), which significantly reduces the load on the hands and impedes movement much less.

Knapsack benzotrimmer

Nice trimmer option anti-vibration system. It reduces vibration stress on the shoulders and hands and protects the hands and back of the mower.

Powerful petrol trimmers to reduce the load on the hands equipped with an ergonomic handle, similar to a bicycle handlebar. On the right handle there are buttons for controlling the operation of the tool. When buying a trimmer, make sure that the handle and button placement are comfortable for you.

Comfortable bicycle grip

The benzokos does not start on a cold

When starting a cold engine, it is not recommended to press the gas. Tilting the brushcutter 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 motor, turn off the starting system.

The gasoline cutter won’t 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.

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It should be borne in mind that products of such well-known companies as STIHL, Husgvarna and other brands will not run on cheap gasoline with a low octane number.
Suitable fuel for them is from the AI ​​92 brand and above from car refueling stations and then from well-recommended ones, since there is also bad gasoline at refueling stations. The use of high-octane and high-quality gasoline will determine how long the brushcutter 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, its working qualities fall, which also leads to consequences in which the petrol cutter will not start. Therefore, it should be diluted in portions, that is, the amount of the 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 about why the petrol cutter will not start and what to do in such cases.

The benzokos starts up and stalls. What to do?

1. There is a spark, and everything seems to be normal, but the petrol cutter will not start, in such cases, you should check the air access 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 petrol brush will start, but then stall. To exclude this reason, you need to clean the valve and try to start a petrol cutter with a tank cap that is not completely twisted.
2. If the brushcutter does not start at the same time, you should remove and clean the fuel filter, as well as check all the carburetor parts, and then try to start. The petrol cutter will not start again, the air filter is disconnected, try to start without it, if the mower starts up, the reason is in the air filter, replace it.

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

Carefully read the instruction manual;
to study in detail the method of the first start-up and running-in of petrol cutters;
try to understand how the product works;
how gasoline is pumped up and so on.

Reasons for malfunction of petrol cutters:

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

The petrol cutter will not start, the spark is gone

The loss of a spark entails checking the contacts and the correctness of the gap between them, the conducting wires to the candle and the candle itself.
The way to check the spark is to unscrew the candle, connect a wire to it, put the candle sideways to the engine casing and pull the starter several times as if starting a petrol cutter, while looking at the coal and the contact of the candle, a spark should run between them.
If there is no spark, take a new candle, follow the same procedure, if the spark cannot be traced, then there is a problem in the wire or contacts, it is better to replace them.

The benzokos does not start when hot

If the brushcutter 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 enough time has passed and the brushcutter has managed to cool down, then it is necessary to start it as if it were cold.
If the above methods did not help, the petrol cutter did not start, then you should contact the service center.

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How to start diagnostics of brushcutters

If the brushcutter does not start or immediately stalls 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;
  • Outlet channel.

These nodes are most often the source of major problems that can be eliminated after a thorough inspection.

Why the petrol cutter won’t start troubleshooting

Caring for the personal plot, summer residents periodically encounter the fact that the petrol cutter does not start. There are many reasons for tool failure. For the correct diagnosis of the problem, the owner of a useful unit in the country needs to know the device and the principle of operation of its individual parts.

  • How to start diagnostics of brushcutters
  • Checking the fuel mixture
  • We carry out diagnostics of a candle and a candle channel
  • Diagnostics of filters for petrol cutters
  • Breather and exhaust port
  • Complex reasons for the failure of petrol cutters
  • Rules for the operation and storage of petrol cutters

Breather and exhaust port

Often, delicate branded petrol brushes do not start and stall due to a dirty 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. You can eliminate the malfunction by cleaning the breather. You can use a regular needle for cleaning.

Normal operation of streamers with internal combustion engines can be disrupted due to dirt entering the exhaust channel or a clogged silencer mesh. There is such a problem on older generation models. The issue can be resolved by traditional cleaning and removal of the anti-spark grid.

We carry out diagnostics of a candle and a candle channel

If the quality of the fuel mixture is not in doubt, and the brushcutter stalls when starting, then a flooded candle may be the cause. Here, for repairs, an ordinary candle wrench is suitable (every motorist probably has) and a spare candle.

  • We unscrew the candle and wipe it;
  • Dry it thoroughly (do not ignite);
  • We drain the excess fuel in the chamber through the spark plug hole and dry it;
  • We clean the old candle from carbon deposits using a file or a lady’s file;
  • We expose a gap with a distance of 1 mm (you can check with any coin);
  • We put everything back in place and try to start the trimmer.
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If the candle is working, the socket where it is located is completely dry, and the petrol cutter does not want to start, lubricate the threaded connection with gasoline. It should be slightly damp. No matter how wonderful a spark the candle may give out, there is simply nothing to ignite in a dry chamber.

If the trimmer motor still does not start, you should exclude such a reason as the absence of a spark due to poor contact between the spark plugs and the high-voltage wire. If the connection is good and there is still no spark, most likely your ignition unit has flown. Here it will not be possible to do without a master, since the part is not repaired, but sold as a single unit.

Diagnostics of filters for petrol cutters

Another reason why the gasoline scythe stalls is the air filter. To eliminate it, try removing the filter and starting the trimmer without it. If possible, then you will have to change the air filter to a new one, or at least blow through and thoroughly clean the old one.

The petrol trimmer may not start if the fuel filter is dirty. This is the next step in 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 turn into repairing the engine piston group.

Checking the fuel mixture

Before starting the engine of the gasoline streamer, check the presence and quality of the fuel mixture. Do not save, do not be greedy and do not be clever in this matter. Repair or replacement of the piston group will cost you too much (sometimes up to 70% of the cost of a new tool). Prepare the oil-fuel mixture strictly according to the instructions. Calculate its amount based on real needs. Excess gasoline left over after work loses its quality over time.

What to do if the petrol lawn mower won’t start?

The most important point when using any equipment is to comply with the basic rules of operation and its timely maintenance. This approach will ensure that your petrol lawn mower is working properly and for a long time. Still, sometimes unforeseen situations happen, and the device for some reason does not want to start. In our article, we will tell you about the possible causes and solutions to such a problem.

Faults that you can correct yourself

When your petrol lawnmower will not start, the first step is to check for fuel in the tank. If it is missing. Top up to the desired level. Often, when the device is not used for a long time, gasoline runs out, so it must be completely drained and refilled with new. This procedure must be done carefully so that fuel does not get onto the engine, as this can lead to ignition in the future (when the engine heats up). Which gasoline is better to use, you can find out from the technical passport of the device.

In order for the unit to start, you need to pump fuel with a primer (if available in this model) into the carburetor and set the maximum speed. You need to start the technique carefully. The starter cord must be pulled out smoothly until it stops, and then pulled towards you with one even sharp movement.

A problem can occur if the air damper is not correctly positioned during the first start. Depending on the air temperature, it is completely closed or set to the middle position (above 30 C). Then it must be fully opened.

Check the air filter for dirt. To do this, turn off the machine and disconnect the wire from the spark plug. Unscrew the cover and remove the filter. Wash it with gasoline and dry it thoroughly, or just put a new one. Remember that it is recommended to change the air filter after every 25 hours of operation.

Another reason your petrol lawnmower won’t start could be a faulty spark plug. Perhaps she was just flooded with fuel. In this case, unscrew it, clean it and check for a spark. It may not be present when the spark plug is filled with fuel. Place choke control handle (if equipped) in the CLOSED position and start the engine. If this does not help, it is better to seek help from a specialist.

Try to constantly inspect the underside of the unit, as any damage to it may cause the engine to stall.

If your petrol lawn mower started up normally but stopped working almost immediately, it is likely that the crankshaft or piston is stuck. Another reason may be insufficient oil in the crankcase. We recommend manually moving these parts and checking the oil level with a special dipstick, you may be able to correct this problem.

However, remember that the replacement and repair of all faulty components and elements should be entrusted to professionals from authorized service centers. Never do it yourself.

If you want to talk with a specialist and get advice on the issue that has arisen, call us by phone: 7 (495) 135-29-39 every day from 10.00 to 20.00. We will provide all the information you need.