The lawn mower will not start hot

Adjustment and tuning of the carburetor

The maximum and minimum engine speed, smooth idle speed are regulated by the carburetor. The stable operation of the lawn mowers depends on the amount of the supplied combustible mixture and air, their ratio. the lawn mower will not start if the carburetor is not properly adjusted. The procedure for adjusting the device for supplying fuel at low speed (L), high speed (H) and idle (T) is regulated by the screws of the same name:

  • The chainsaw must run for at least 10 minutes, since the adjustment is carried out on a hot.
  • Turn screw H smoothly to maximum speed, then turn it by ¼, counterclockwise, reducing the speed of rotation of the engine shaft.
  • Idling is adjusted with the T screw, so that the scythe does not rotate.
  • The screw L is adjusted, at first opening the throttle to the maximum, and then smoothly decreasing the speed to stable minimum.

After adjustment, a serviceable carburetor with cleaned filters and a checked ignition must ensure the engine is running. In the event of a carburetor malfunction, after repairing it, you will need to adjust the feed system again before starting the lawn mower.

Rare breakdowns that prevent lawn mowers from working can be:

  • rewind spring failure;
  • Broken or stuck starter pulley
  • faulty starter assembly.

The most important malfunction, the elimination of which is associated with replacing the engine, may be the failure of the engine piston group. The cost of repairs will cost about 70% of the cost of the product. Understanding the reasons why the lawn mower won’t start will help

How not to get confused if the lawn mower won’t start


  • engine malfunction (piston wear, bearing malfunction, crankcase crack);
  • malfunction of the fuel mixture supply. clogged pores of the air filter or carburetor malfunction;
  • the ignition system does not work;
  • mechanical malfunction. leaking hoses, broken wires under the braid, ruptured tubes.

The user first needs to check if there is fuel in the tank. Start up in accordance with the instructions, with the saw on its side. Set the air damper to the “closed” position, pump up fuel, turn on the ignition and make 3-4 sharp jerks with the starter. If the engine is running, open the air damper. The lawn mower does not start. we repeat the operations with a slightly open air damper.

the lawn mower cannot work for a long time. The gearbox and the motor will overheat. Mowing can be no more than 15 = 20 minutes, taking a five-minute break. On a sultry afternoon, the operating time is cut in half. When mowing weeds, sedges, the working time must be reduced.

If the launch fails, we start looking for the reason for the failure:

  • check the quality of the fuel;
  • make sure that the candle is working and the candle channel is clean;
  • check the cleanliness of the air filter;
  • make sure the fuel filter is not clogged;
  • check the cleanliness of the breather;
  • clean the outlet.

complex causes will be found during the diagnosis of malfunctions leading to overhaul of the carburetor. Such reasons include clogging of the internal channels of the carburetor, wear of the gasket on it and a violation of the tightness of the internal halls with a loss of vacuum. Do-it-yourself lawn mowers repair, if it won’t start, will take patience.

Eliminating the reasons why the lawn mower won’t start

The fuel mixture must be prepared with the exact proportions of gasoline and oil. In this case, you cannot use another brand of fuel. To exclude the ingress of dirt, gasoline must settle in glass or metal containers for 2 days. Do not use plastic utensils for storing fuel. Measure the oil accurately with a medical syringe without a needle. Use only freshly prepared mixture, do not leave unused fuel in the tank. If the engine is naughty, the lawn mower stalls, when you press the gas, the fuel may be to blame.

the lawn mower will not start hot. pull the gas trigger and pull the cord abruptly several times until the engine starts, then pull the trigger. Will not start. specialized repair required.

Checking the ignition system, if the lawn mower does not start, is carried out sequentially:

  • clean the removed candle from carbon deposits and dirt, dry it, set a gap of 1 mm;
  • connect to a high-voltage wire and check for a spark by pulling the starter several times;
  • in the absence of a spark, check the high-voltage wire for integrity;
  • replace the candle;
  • dry the candle channel;
  • at the same time the operation of the ignition coil is checked, it is faulty if the working plug does not spark.

It is in the event of a malfunction of the ignition coil of the lawn mower does not start up hot, stalls, works intermittently.

Cleaning or replacing the air and fuel filter will ensure the proper consumption of ingredients entering the carburetor. The air filter can be washed in soapy water or replaced. If nylon fabric is used, it is washed, the porous felt filler is replaced. Change the fuel filter carefully without leaving the intake manifold open. Whether it is necessary to replace the air filter can be determined if the engine starts with the air cleaner removed. Is it necessary to change the grid on the fuel supply, if the lawn mower does not start, a dry candle will tell.

Breather, gas tank air inlet. If it becomes clogged, a vacuum is created in the tank and the mixture does not enter the carburetor. The hole can be blown out with air or cleaned with a needle. Clean the exhaust duct, remove the anti-spark screen of the muffler.

Taking proper care of your chainsaw

There are no unnecessary phrases in the operating instructions, everything that is offered is aimed at trouble-free operation of the lawn mowers. Cleaning of all parts after each work cycle facilitates the easy removal of uncured residues and dirt. You need to clean only the cooled nodes. This technique contributes to the quality of air cooling of the engine and gearbox.

For refueling, you must use fuel with the oil recommended in the instructions. If the combustible mixture is left in the fuel tank, the oil will float up and, upon start-up, will land on the damper, impairing its adjustment. The mixture can sediment and clog the fuel feed in the carburetor.

When storing the equipment for the winter, conduct an audit, lubricate the gearbox and piston system, Wrap the entire saw in oiled rags and store in a dry place.

It is impossible, it is dangerous for the tool and the health of the mower, to use a metal cable instead of a fishing line. It cuts more efficiently, but the load on the gearbox and engine increases. A worn-out piece of wire flies at the speed of a bullet when it comes off. Effective mowing can lead to early wear of the engine piston group. For more efficient mowing, it is suggested to use the “star” line profile.

Lawnmower won’t start

When caring for a garden plot, sometimes people have to deal with the fact that their lawn mower will not start. There are several reasons for the failure of this tool.

the lawn mower does not start well when hot

When the lawn mower is working properly, and after a short break does not want to start again, you need to press the gas trigger and pull the starter cord sharply several times in a row until the engine starts and only then release the gas trigger.

lawn, mower, start

lawn mower will not start. reasons

Improper storage, long interruptions in operation, untimely maintenance and other factors lead to the fact that the lawn mower may stop starting.

Diagnostics of the causes should be started by checking the main components. the fuel tank, candles and spark plug channel, air and fuel filters, breather, exhaust channel. Most often, problems are associated with one of these nodes, and a thorough examination of them will help determine why the lawn mower will not start.

If you use low-quality fuel (lower than AI-92), this can lead to a breakdown of the cylinder-piston system, the repair of which will result in about a third of the cost of a lawn mower. In addition, it is important to observe the correct gasoline to oil ratio as indicated in the owner’s manual for your particular model.

A dirty fuel filter can also prevent the engine from running. If you find this problem, you need to replace the filter. It doesn’t hurt to check the air filter as well. If it gets dirty, it is necessary to dismantle it, rinse it in water and detergents, dry it, lubricate it in oil and put it back. Spark plugs that show no signs of life should be replaced with new ones.

Riding Lawn Mower Doesn’t Crank or Click

Sometimes the lawn mower starts normally but then stalls. This is mainly due to an incorrect carburetor setting or misalignment. You can determine that the reason is precisely this by the vibrations that are palpable during operation. You need to adjust the fuel supply adjustment by following the instructions for the tool.

the lawn mower will not start on a cold

On the other hand, it is not recommended to press the gas when planting cold lawn mowers. It is necessary to tilt the lawnmower so that the air filter is at the top and press the suction button 5-6 times, then set the function switch lever to the “Start” position and pull the cord several times until the engine starts. After a few seconds of spit operation, the launch system can be disabled.

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When does not start on a hot carburetor engine

Why is it bad to start hot and what to do

The reasons why the carburetor does not start well on a hot one are more or less clear, the volatility of gasoline is mainly to blame. The bottom line is that when the engine warms up to operating temperature, the carburetor also heats up, and after turning off, within 10-15 minutes, the fuel begins to evaporate, so it is difficult to start the car.

Pressing the gas pedal to the floor and purging the fuel system will help to start a hot engine in such a situation, but no longer than 10-15 seconds, since the fuel can fill the candles. If the question concerns “Zhiguli”, then the fuel pump may also be to blame, since “Zhiguli” gasoline pumps do not like heat very much and sometimes refuse to work at all when overheated.

Why does a warm engine stall

Some motorists are faced with a situation when an already running and warmed-up engine suddenly stalls. over, this happens after the sensor has recorded a set of normal operating temperature. There may be several reasons for this. Next, we will consider them in more detail, and also indicate what needs to be done in this or that case.

  • Poor quality fuel. This situation is typical, for example, if you drive away from a gas station, and after a short period of time the engine starts to “cough”, the car jerks and stalls. The way out here is obvious. drain the low-quality fuel, purge the fuel system and replace the fuel filter. It is also advisable to replace the candles, but if they are new, you can do with blowing them. Naturally, you shouldn’t go to such a gas station in the future, and if you have saved the check, you can go there and make a claim about the quality of the fuel.
  • Fuel filter. If the engine stalls, you should also check the condition of the fuel filter. And if, according to the regulations, it is already supposed to replace it, then you need to do this, regardless of whether it is clogged up or not yet.
  • Air filter. The situation is similar here. The engine can become “swollen” with the rich mixture and stall shortly after starting. Check its condition and replace if necessary. By the way, this way you can also reduce fuel consumption.
  • Gasoline pump. If it does not work at full capacity, then the engine will receive less fuel, and accordingly, after a while it will stall.
  • Generator. If it is completely or partially out of order, then it stopped charging the battery. The driver may not immediately notice this fact, start the engine and drive. However, it will only drive until the battery is completely discharged. Unfortunately, it will not be possible to start the engine again. In some cases, you can try to tighten the alternator belt. If this procedure did not help, you need to call a tow truck or call your friends so that your car can be dragged to the garage or service station.

Try to monitor the normal state of the above nodes and mechanisms. Even minor breakdowns, if not eliminated in time, can develop into big problems that will turn out to be expensive and difficult repairs for you.

When the injection engine does not start

Since an injection engine is somewhat more complicated than a carburetor engine, there will be more reasons why such a motor will not start. In particular, they can be malfunctions of the following components and mechanisms:

  • Coolant temperature sensor (coolant). In hot weather, it can fail and give incorrect information to the ECU, in particular, that the coolant temperature is above normal.
  • Crankshaft position sensor (DPKV). Its failure will lead to incorrect operation of the ECU, which in turn will prevent the engine from starting.
  • Mass air flow sensor (DMRV). In hot weather, the sensor may not cope with the tasks assigned to it, since the temperature difference between the incoming and outgoing air masses will be insignificant. In addition, there is always the possibility of its partial or complete failure.
  • Fuel injectors. Here the situation is similar with a carburetor engine. The fine fraction of gasoline evaporates at high temperatures, forming a rich fuel mixture. Accordingly, the engine cannot start normally.
  • Fuel pump. In particular, it is necessary to check the operation of its check valve.
  • Idle speed regulator (IAC).
  • Fuel pressure control.
  • Ignition module.

Next, let’s move on to considering the possible causes of a bad hot start in cars with diesel engines.

Top 3 Reasons for Poor Hot Startup

So, according to statistics, the main reasons for poor engine start after idle at high temperatures are:

  • Enriched fuel mixture, which is formed due to low-quality gasoline (its light fractions evaporate, and a kind of “gasoline fog” is obtained).
  • Defective coolant sensor. At high ambient temperatures, it is likely to malfunction.
  • Defective ignition. It may be incorrectly set or there are problems with the ignition switch.

We will also give you a table where we tried to visually show which components can cause problems, and what needs to be checked in engines of different types.

Types of engines and their typical causes Carburetor Injection Diesel
Low-quality fuel, evaporation of its light fractions
Defective coolant sensor
Crankshaft position sensor
Mass air flow sensor
Fuel injectors
Fuel pump
High pressure fuel pump
Idle speed regulator
Fuel pressure control
Diesel idle system
Ignition module

Poor hot start

With the arrival of hot days, more and more drivers are faced with the problem of a poor engine start on a hot one, after a few minutes of parking. over, this is a problem not only of carburetor engines. a situation when it does not start up hot can await both the owners of cars with an injection engine and diesel cars. Only the reasons are different for everyone. Here we will try to collect them and identify the most common.

When it starts badly on a hot diesel engine

Unfortunately, diesel engines can sometimes fail to start hot. The most common causes of this phenomenon are malfunctions of the following nodes:

  • Coolant sensor. The situation here is similar to that described in the previous section. The sensor may fail and, accordingly, transmit incorrect information to the ECU.
  • Crankshaft position sensor. The situation is similar to an injection engine.
  • Mass air flow sensor. Likewise.
  • High pressure fuel pump. In particular, this can happen due to significant wear of the bushings and the oil seal of the pump drive shaft. Air enters the pump from under the stuffing box, which makes it impossible to gain operating pressure in the sub-plunger chamber.
  • Diesel engine idle system.
  • Fuel pressure control.
  • Ignition module.

Now we will try to summarize the information provided so that it would be easier for you to find the cause of the breakdown if it happened to your car.

plunger pair of injection pump

The first thing to do in order for the engine to start up normally on hot is to refuel at proven gas stations, as well as monitor the state of the fuel system of your car. If the engine does not start after even a short standstill in the heat, first of all open the throttle valve (press the accelerator pedal) or remove the filter cover and leave it open for a couple of minutes. During this time, the evaporated gasoline will evaporate and you will be able to start the engine normally. If such a procedure did not help, then it is necessary to perform troubleshooting among the components and mechanisms described above.

Why Small Engine Shuts off and Doesn’t Start Until Its Cool

Lawnmower won’t start after winter: reasons and solutions

Many owners of modern models of gas powered tools are faced with such a problem as the complete lack of functionality of the unit after wintering. If the lawn mower does not start, the first step is to perform a comprehensive maintenance on the petrol trimmer. To do this, you need to remove the fuel system and disassemble the carburetor of the lawn mowers, thoroughly cleaning, rinsing and blowing air through each unit.

It should be noted that after winter, as a result of long-term storage, the diluted fuel mixture loses its basic characteristics, which also leads to the impossibility of starting the lawn mowers. The use of an updated fuel composition, in this case, eliminates the problem.

A typical malfunction is the absence of a spark, as a result of which it is necessary to check the contacts and the correctness of the gap between them. When there is a spark, but the tool still does not want to function, the valve, which is responsible for air entering the fuel tank, should be inspected. If it becomes clogged, cleaning is required. The reason that the lawn mower will not start may be hidden in the fuel filter, which needs to be cleaned and started again.

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When you start the mower on a cold one, do not step on the gas. Tilt the tool so that the air filter is in the correct position and press the fuel suction button several times, fixing the options switch lever to the “start” position. Then pull the starter cord 6-7 times until the engine starts to function, after which, after waiting 5-8 seconds, turn off the starting system.

Today, there are many videos on the Internet, in which the main causes of malfunctions of various models of lawn mowers after winter are considered in detail and the correct ways to eliminate them are proposed.

Why doesn’t the lawnmower start hot?

Why doesn’t the lawnmower start hot?

It often happens that the lawn mower does not start when hot. In this regard, the question “why?” Is quite logical. Mostly, the cause of such a malfunction can be associated with the following technical components of the tool:

lawn, mower, start
  • Fuel tank.
  • Exhaust channel.
  • Breather.
  • Trimmer starter.

One of the common breakdowns that lead to the fact that the petrol trimmer does not start hot is the presence of a blockage in the area of ​​the air filter. Improper preparation of the fuel mixture, as well as its quality, also become the initiators of a failure in the operation of the unit. Often the reason a 4-stroke lawnmower doesn’t want to start is if the candle channel is too wet.

The stable operation of the tool can also be impaired due to the accumulation of dirt in the exhaust channel or the accumulation of large amounts of debris on the muffler mesh.

The petrol trimmer will not start. floods the candle / candle is always wet

Among the many reasons for which the trimmer will not start, it is the filled spark plugs that are considered the most common. According to statistics, every second owner of a tool faces a similar problem. In most cases, the candle is always wet for the following reasons:

  • Accumulation of large amounts of carbon deposits on the component.
  • Incorrect installation of the spare part.
  • Excessive supply of fuel mixture by injectors to the combustion chamber.

When the gasoline trimmer does not start due to the fact that the candle is constantly being poured, the user needs to eliminate the excess fuel mixture, thoroughly clean all the components involved in this process, and then blow out the candle, giving time for everything to dry.

Regardless of whether you are the owner of a budget Chinese-made gasoline tool or use expensive models from a brand such as Husqvarna, cleaning the lawn mower plug is carried out in the following sequence:

  • Turn the tool over, and run the starter until the excess fuel mixture is completely discharged.
  • Dismantle, blow out and clean the candle, leaving it to dry for 40 minutes.
  • A completely dry spare part is put back.
  • An attempt to launch the tool, moreover, on a hot.

By following the above steps, you will be able to effectively troubleshoot faults caused by flooding the candle.

What to do if the petrol trimmer won’t start

A long seasonal break in work, violation of storage rules and non-compliance with operating standards, lack of regular maintenance lead to the fact that the petrol trimmer does not start. In this case, the first step is to make sure that the fuel mixture is available and its quality.

For petrol trimmers from manufacturers such as Stihl or Husqvarna, prepare the oil / fuel mixture as indicated using the appropriate brand of oil. After verifying that the fuel mixture is flawless but the tool still does not start, check for a spark, which can often be missing from a flooded spark plug. If the plug is dry, the connection is of good quality, but there is no spark, the ignition unit is most likely out of order.

What if the above points are in order, but the Sturm lawn mower or Stihl petrol trimmer does not start? It is necessary to diagnose the gasoline and fuel filter, as well as carefully examine the carburetor for the likelihood of piston group wear.

lawn mower won’t start for hot reasons

Trimmer stalls at idle. reasons and solutions

Common situations where a trimmer or lawn mower stalls is idling. Let’s go straight to the reasons:

  • heating of the gearbox and a drop in revolutions on the drum as a result of the gasoline solution not being prepared quite correctly. The required proportion is 1: 4;
  • contamination of the carburetor;
  • the throttle valve is clogged;
  • when the damper is opened (if such an experiment was carried out), the air flow makes the mixture “lean”;
  • adjusting the carburetor;
  • clogged air filter;

Insufficient amount of fuel, which is needed for the operation of the gasoline-powered tool, will entail a situation when at high speeds, with an increase, the trimmer works, and at idle it stalls. In a situation with a carburetor, the device will stall on cold start and “hot”. For any lawn mower user. a professional and an amateur, it is important to understand that any malfunction of the tool may depend on fine flaking of the part, detachment of the fastener or clogging, as well as on the global breakdown of an important part of the mechanism.

Despite all sorts of malfunctions, your device still needs such an indispensable component as lawn mower knives, without which the operation of the scythe is simply impossible.!

The lawn mower stalls when you press the gas, how to fix a breakdown

Likewise, when the throttle is pressed, the tool stalls because the actuator is clogged. The following option is also possible: the fuel does not come in full volume, so you need to check or replace the fuel filter. Other possible reasons for stalled lawn mowers when giving gas include:

  • Crankshaft oil seals suck in air;
  • A spacer that is located between the carburetor and the cylinder in a “problem” situation;

To all of these reasons why the mechanism stalls when gas is added, we will add some helpful tips on how to handle your lawn mower. First of all, before starting work with any technique, you need to read the instructions. In this case, the consistency of gasoline and oil plays an important role, it is competently prepared by you, and also not to overheat the unit, and not to leave gasoline for the winter when you simply will not use the car.

The well-coordinated work of all its components plays an important role in the full-fledged work of any tool. And if in one it is a line for lawn mowers, then in the other it is a piston or a carburetor. Lawnmower owners who want to use their tool at full capacity need to understand that under a load for which the machine’s capabilities are not designed, the entire mechanism or its individual parts can simply break. Therefore, only competent and moderate operation presupposes long-term efficient operation of any gasoline-powered tool.

Why the lawn mower stalls

Before figuring out why any of the tools of a summer resident-gardener or a professional working with a lawn mower (lawn mower) stalls, it is worth distinguishing between two main situations when this happens. The first is when the instrument does not start after you have just made the purchase, and the second is when the instrument is in use. So, let’s look at both.

  • After launch. The lawn mower stalls if the carburetor is set incorrectly or if it has been adjusted. Fuel is supplied unevenly, respectively, there are distinct vibrations.
  • When heated. The situation when the mechanism starts and works, but gradually “chokes” and stalls on the move. when gasoline boils in the carburetor, or the damper in the carburetor is not disc, but rotary. In such cases, it is better to replace the carburetor itself. There is a variant of air leakage. when the coil or wire in the ignition is broken.
  • At high revs. This also occurs from a carburetor straightening or clogging of the cap on the gas tank. It is worth trying working with a slightly open valve. Be sure to check the fuel intake hose. it may be cracked or poorly attached to the base.
  • Not gaining momentum. As the main reason why the engine does not pick up speed, the air filter is clogged. It is possible for the cable to fall off in the carburetor, breakdown of the carburetor and the occurrence of problems with the mechanics of the motor drive.

There are times when a part of the mechanism requires mandatory replacement, so we are always happy to offer spare parts for lawn mowers. It is important to understand that sometimes saving on minor elements can lead to breakdown of such global components as the carburetor or engine. Therefore, competent operation and timely replacement of the necessary particles will provide you with a full-fledged work with pleasure.

lawn mower won’t start for hot reasons

When the air damper is opened

It happens that the unit stalls when the air damper is opened, normally idling. 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.

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Fuel hose in carburetor

All the possible reasons that the lawn mower stalls, and how to fix them, are contained in the following video.

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.

In order for the trimmer to work normally for a long time, you must strictly follow the instructions for use. It is necessary to fill the unit with a suitable fuel mixture, the unit should operate at moderate load.


Unfortunately, it happens that it does not start well on a hot engine. In fact, in a car with such an engine, there may be even more circumstances than in a carburetor engine. As is clear, a car with an injection engine works 100% in automatic mode. Therefore, all work here is based on the readings of different sensors.

The first and main reason why such an engine does not start when it is warmed up is the incorrect operation of the sensor, which indicates the temperature of the cooling water.

The fact is that when the sensor indicates an incorrect temperature, the electrical unit gives an incorrect command to the injectors, which inject an unnecessary dose of fuel. It often happens that the sensor is simply clogged, because of this, and does not indicate the correct temperature of the cooling water.

In this case, you just need to clean the sensor and install it back. If the sensor has become unusable, then it must be replaced with a new one.

complex reasons for lawn mowers failure

If the step-by-step troubleshooting algorithm does not work, 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 erratic tool performance. There are three main problems here:

  • Clogged ducts or nozzles. All this is cleaned by special washes or blown by a powerful jet of compressed air from the compressor. Do not use needles and wires, as the bore may be damaged;
  • Worn carburetor gasket. Exit. replacement of a failed gasket;
  • Violation of tightness. To check this indicator, you can use an ordinary household tonometer, replacing it with a suitable pressure gauge. Watch the readings: if they do not change, everything is fine, but if the pressure starts to drop, then some part of the carburetor is faulty. We’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 of the piston group. If chips, scratches or scuffs are found on the piston or cylinder, they should be replaced.

Piston rings are subject to mandatory checks. A small backlash of the piston when rocking the connecting rod indicates that it is time to change the rings.

This procedure is best entrusted to the specialists of the service center.

Checking the fuel mixture

Let’s say your trimmer won’t start. In this case, the first step is to check if there is enough fuel in the tank, and also to assess the quality of the fuel mixture. It is necessary to refuel the motorized unit with exclusively high-quality gasoline.

It is recommended to use fuel, the grade of which is not lower than AI-95. Filling the trimmer with fuel of unknown origin not purchased from a gas station can cause frequent tool malfunctions. This can cause damage to the piston-cylinder system.

In this case, repairs often exceed the cost of the device itself.

Why won’t the petrol trimmer start? Improper preparation of the fuel mixture, which consists of oil and gasoline, can also lead to this. The proportions in which these components are connected are indicated by the manufacturers in the trimmer instruction manual.

It is highly discouraged to prepare a fuel mixture in large volumes, that is, for the future. Indeed, with long-term savings, there is a loss of the defining properties of the substance.

Therefore, if the trimmer does not start, it is worth draining the old fuel and using a freshly prepared fuel mixture.


The breather is a non-return valve that is designed to equalize the pressure in the gas tank.

If it is clogged and does not allow air to pass towards the tank, then a vacuum forms inside the fuel container, and the fuel ceases to flow into the carburetor.

To check if the valve is working, remove the hose that goes from the reservoir to the carburetor. If gasoline does not flow out of the tank, it means that the breather is clogged.

Trimmer users often ask themselves: Where is the breather? This valve is usually located in the gas cap and looks like the following figure.

Cleaning the breather is very simple: disassemble the valve and rinse all of its components. On some mowers, this valve may be located directly on the fuel tank. It will not be possible to find it right away, since it is hidden from view under the starter housing. Such a breather is cleaned with a regular needle.

Breather and exhaust port

Often, “gentle” branded lawn mowers will 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, which prevents 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 the ingress of dirt into the exhaust duct or clogging of the muffler 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.

The chainsaw does not start on a hot

The chainsaw does not start on a hot.

Adjustment and tuning of the carburetor

  • The chainsaw must run for at least 10 minutes, since the adjustment is carried out on a hot.
  • Turn screw H smoothly to maximum speed, then turn it by ¼, counterclockwise, reducing the speed of rotation of the engine shaft.
  • Idling is adjusted with the T screw, so that the scythe does not rotate.
  • The screw L is adjusted, at first opening the throttle to the maximum, and then smoothly decreasing the speed to stable minimum.

After adjustment, a serviceable carburetor with cleaned filters and a checked ignition must ensure the engine is running. In the event of a carburetor malfunction, after repairing it, you will need to adjust the feed system again before starting the lawn mower.

  • rewind spring failure;
  • Broken or stuck starter pulley
  • faulty starter assembly.

The most important malfunction, the elimination of which is associated with replacing the engine, may be the failure of the engine piston group. The cost of repairs will cost about 70% of the cost of the product. that the trimmer will not start hot or even cold. that the trimmer does not start well. Understanding the reasons why the lawn mower won’t start will help

How to prevent sudden breakage during trimmer operation?

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

  • Conduct a timely, regular technical inspection of the main mechanical components of the device.
  • Fill the trimmer with only fresh fuel, the quality and origin of which is beyond doubt.
  • After each use of the tool, check whether oxides and carbon deposits have formed on the surface of the ignition system components.
  • Avoid heavy load on the trimmer during work.

In order for the unit to remain in working order, it is necessary to properly prepare it for storage in the winter. First of all, you should completely disassemble the instrument, and then flush and clean the constituent elements. It is also important to inspect the functional blocks for damage, if necessary, eliminating the deformation of parts, all kinds of distortions, gusts of materials.