Gas trimmer won't start when hot

Summer days have arrived, and lawn mowers begin to rumble as usual in their summer cottages. This tool is good for everyone - powerful, mobile. Using a gasoline trimmer, you can mow the grass and get rid of dried weeds. However, it happens that the lawn mower does not start or works intermittently, without developing full power. There's no time for work anymore! As FORUMHOUSE users say, “you pull the starter handle more than you mow.” Why the trimmer won't start and how to deal with it is discussed in this article.

Diagnostics of the candle channel

What should you do if the used fuel mixture is working properly, but the gasoline trimmer still won’t start? The prerequisites for failure of the mechanism may lie in excess moisture in the spark plug channel. To diagnose and remove the problem, you need to do the following:

We unscrew the candle. Wipe thoroughly and then dry.
Drain excess fuel from the chamber through the appropriate plug hole.
Clean the old cork if there is carbon on its surface. You can cope with the task by using an ordinary nail file or nail file.
When installing the element in place, set a gap of one mm. To check the parameter, just put any coin in the space.
Reassemble the multifunctional unit.
Try starting the trimmer.

It is recommended to dry the candle channel for more than half an hour. But under no circumstances should you resort to calcining its parts. After all, heating the spark plug can lead to its permanent damage. What to do if the service of the multifunctional unit was carried out in accordance with the tips indicated above, but the trimmer does not start, is there still a spark? In this case, it is worth treating the threaded connection with gasoline. The latter does not need to be heavily soaked in fuel. It should only be a little wet. Such actions must be done to ensure fire. After all, no matter how strong a spark a candle gives, in a completely dry chamber there will simply be nothing to ignite.

If even in this case the trimmer does not start, it is worth assessing the quality of the contact between the high-voltage wire and the spark plug. If there is no spark (if there is a reliable connection between these elements), most likely the problem is caused by a breakdown of the ignition unit. In this situation, you will have to turn to the services of specialists who will reinstall the unit.

Dry and wet spark plug, what does this mean and how does it affect engine starting?

Most tool owners immediately resort to checking the condition of the spark plug contacts. This is done in order to understand from the condition of the spark plug what could be the reason for the impossibility of starting the lawn mower engine. Based on the condition of the spark plug contacts, appropriate conclusions can be drawn about what may be causing the malfunction. Diagnosis of the spark plug on the trimmer is performed in the following order:

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

This is interesting!
Drying spark plug contacts by calcining them is strictly contraindicated, as this method will lead to damage to the part.
If there is a spark at the spark plug, but the trimmer does not start, then the reason lies in the supply of the fuel mixture to the combustion chamber. To make sure of this, you should do the following:

Take 20 grams of fuel into the cap of a PET bottle or into a syringe
Pour it into the combustion chamber through the spark plug hole
Screw in the spark plug
Put on the candle holder and start the engine

If the engine of the lawn mower starts after the above steps, then the cause of the malfunction should be sought directly in the fuel line and carburetor. If the engine does not start even after these steps, then you need to check the serviceability of the high-voltage wire. The high-voltage wire, like the spark plug, is a consumable item. If there is a suspicion that the trimmer armored wire is faulty, it should be replaced

If, after the above steps, you cannot start the engine of the lawn mower, then you need to take into account the following recommendations:

If there is any doubt about the serviceability of the spark plug and high-voltage wire, it is recommended to replace them immediately
Check that sparking is working properly, and if there is no spark on the new spark plug, then the breakdown is related to the ignition unit - coil failure
The ignition coil is not repaired, but replaced. If the diagnostics really indicate a malfunction of the lawn mower’s ignition coil, then it is not difficult to replace it with your own hands

https://youtube.com/watch?v=YixHJCGg9gg%3F

If there is a spark plug, and it is dry, and the trimmer does not want to start, then we move on to checking the next unit - the air and fuel filters.

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

Troubleshooting strategy

Where to start troubleshooting if the trimmer does not start? In situations where the tool stalls immediately after starting, it is worth examining the following components of the unit:

Fuel tank;
Spark plug;
Fuel and air filter;
Output channel;
A break.

Specifically, the breakdown of the locations listed above in most cases leads to the fact that the trimmer does not start well. Let's see how to remove such problems.

Checking filters

Another common reason why the trimmer does not start. This is a clogged filter area. To confirm the hypothesis, it is enough to disassemble the designated block and try to start the unit without it. If the trimmer engine starts, most likely you will have to change the air filter or at least carefully blow out the old one. If there is heavy contamination on the surface of the filter element, you need to use a new mesh. When resorting to such actions, do not leave the absorption pipe completely without a filter. After all, haste in this case can lead to the need to repair the entire piston group of the engine unit.

Fixing problems

All reasons

, according to which the gasoline pump cannot be started, can be classified in accordance with the specifics of the operation of individual units. In the service center, faults are classified as follows:

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

First, the user needs to check the presence of fuel in the tank. Start as instructed with the saw on its side. The air damper should be set to the “closed” position, refuel, turn on the ignition and make 3-4 sharp jerks with the starter. If the engine starts, open the choke. Do not start the gasoline pump. repeat the operations with the air damper slightly open.

The brush cutter cannot work for a long time. and the engine will overheat. Mowing can be no more than 15 = 20 minutes, with a five-minute break. On a hot afternoon, operating hours were cut in half. When cutting weeds and sedges, the working time must be reduced.

If the startup fails, we begin to look for the cause of the failure:

check the quality of the fuel;
to ensure spark plug efficiency and spark plug channel cleanliness;
check the cleanliness of the air filter;
make sure the fuel filter is not blocked;
check the cleanliness of the respite;
clean the exhaust channel.

More complex causes will be found when diagnosing a malfunction leading to a major overhaul of the carburetor. These reasons include clogging of the internal channels of the carburetor, wear of the gaskets on it and a violation of the integrity of the internal chambers with loss of vacuum. Repairing a gasoline pump yourself if it won't start will require patience.

Why won't my petrol trimmer start? Causes and their elimination

Coming soon: petrol trimmer

acquired the status of one of the main tools in the arsenal of summer residents. And this is logical, because a motorized scythe allows you to quickly tidy up your own garden plot. But from time to time it happens that the trimmer does not start either hot or even cool. In such situations, you will have to determine the cause of the malfunction without the help of others. Let's figure out what to do if the trimmer doesn't start. The prerequisites that in most cases lead to such troubles will be discussed below.

READ How to Dilute Trimmer Mixture Proportions

More complex reasons for lawn mower failure

If the step-by-step troubleshooting algorithm does not produce 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 of compressed air from a 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. Piston rings must be checked. 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.

How to prevent sudden breakdowns during operation of the trimmer?

In order to ensure that the unit is always in working condition, it is worth following a few common rules:

Conduct ongoing technical inspection of the main mechanical components of the device in a timely manner.
Refill the trimmer only with the freshest fuel, the quality and origin of which does not cause any doubt.
After each use of the tool, inspect whether oxides or carbon deposits have formed on the surface of the ignition system.
Beware of putting enormous strain on the trimmer during operation.

In order for the unit to remain in working condition, it must be properly prepared for winter storage. First, you should completely disassemble the instrument, and then wash and clean the components. It is also important to inspect multifunctional units for damage, and, if necessary, eliminate deformation of parts, various distortions, and tears in materials.

Ignition system is faulty

Among the main problems with the ignition system are the following:

the gap between the ignition coil and the flywheel is incorrect;
ignition coil failure;
problems with the spark plug.

Short circuit of wires

To shut down the engine, the switch connects the wires and short circuits the ignition system to low voltage. The wires can chafe, causing the insulation to break and causing a short circuit.

You can find out the condition of the parts by removing the power button wire from the ignition system terminal. Next, the resistance is measured in the on and off modes.

If the problem is not in the wiring, then in the first mode the resistance will move to infinity, and in the second it will show a short circuit.

Actions with damaged wiring:

disassembling the working handle;
soldering or cutting wires to the button, as well as to the ignition system and engine;
old wires need to be pulled out and new ones installed in their place;
new wiring is soldered or connected with glue;
The last step is to put the handle back together.

Incorrect gap between magneto and ignition coil

The aluminum flywheel of the engine has 2 magnets. The energy between these magnets accumulates in the capacitor of the ignition unit.

Magnets can operate effectively only at close distances from each other. For this reason, the ignition unit is securely attached.

On many devices, the clearance between the flywheel and the block can be adjusted because the flywheel is in a high temperature zone.

The holes in the scythe housing clogged with dirt or grass lead to an increase in the temperature inside the device, and the flywheel catches on the ignition unit. The vibration in the tool becomes greater and the gap between the magneto and the ignition coil increases.

The optimal gap is 0.2 millimeters. You can measure it with a caliper tool.

It is important to clean the scythe housing after each trimmer operation. Such actions will help reduce the likelihood of the gap increasing.

Ignition coil unit is faulty

If everything is fine according to the previous points, but the trimmer does not start well or cannot be started at all, then you need to check the unit for serviceability.

To diagnose, the wires are disconnected and the spark plug wire is removed from the spark plug. In both coils you need to determine the resistance:

primary resistance from 2 to 3 ohms;
secondary from 4.5 to 5.5 kOhm.

If there is a difference of more than 30% in the resistance of one of the coils, the ignition unit needs to be replaced. You can check the ignition in another way, using an ignition tester.

If there is a spark, then the problem is different, and if there is no spark on the trimmer, then the tool block needs to be changed.

Checking the fuel mixture

Let's say your trimmer won't start. In this case, you first need to check whether there is enough fuel in the tank, and also evaluate the quality of the fuel consistency. The motorized unit should only be refueled with high-quality gasoline. It is recommended to use fuel of a grade not lower than AI-95. Filling the trimmer with fuel of unknown origin, obtained not at a gas station, can cause frequent malfunctions of the tool. This may damage the piston-cylinder system. In this case, repairs often exceed the price of the device itself.

Why a petrol trimmer

won't start? This can also be caused by incorrect production of the fuel mixture, which contains oil and gasoline. The proportions in which these components are combined are indicated by the manufacturers in the instructions for using the trimmer. It is highly not recommended to prepare the fuel mixture in large volumes, in other words, for the future. Indeed, with long-term savings, the defining parameters of the substance are lost. Therefore, if the trimmer does not start, it is worth draining the old fuel and using a freshly prepared fuel mixture.

Proper care of a chainsaw

There are no unnecessary phrases in the operating instructions; everything that is offered is aimed at the smooth operation of the gasoline pump. Cleaning all parts after each work cycle makes it easier to remove unhardened residues and dirt. Clean only cooled parts. This method contributes to the quality of air cooling of the engine and gearbox.

For refueling, you must use fuel with the recommended oil in the instructions. If the fuel mixture remains in the fuel tank, the oil will float and, upon startup, land on the damper, impairing its adjustment. The mixture may settle and clog the fuel in the carburetor.

When storing equipment for the winter, inspect and lubricate the gearbox and piston system, wrap the entire saw in an oiled rag and store it in a dry place.

It is impossible, and 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 gear and motor increases. The frayed piece of wire flies at the speed of a bullet while being disconnected. Effective mowing can cause rapid wear on the engine piston. For greater mowing efficiency, it is suggested to use a star line profile.

Recommendations for storing a gasoline trimmer in the off-season

When storing the trimmer, it is worth pouring a sufficient amount of oil into the box. Then you need to clean the air filter, partially disassemble it, blow it out and wash the engine of the unit. After all devices have dried, moving elements should be lubricated. To treat the piston system with oils, you must first remove the spark plug. Then you need to move the piston to the last position, then pour a small amount of oil into the plug and turn the crankshaft. If you do not plan to store a gas trimmer

During the off-season in the house, it is recommended to tightly wrap the unit’s engine with an oiled rag. This will avoid the development of corrosion on the surface of key parts of the mechanism.

Injector

Unfortunately, it happens that on a hot engine it doesn’t start well. In fact, in a car with such an engine there can be even more events than in a carburetor one. It is clear that a car with an injection engine operates 100% automatically. Therefore, all the work here is based on the readings of various sensors.

The first and main reason why such an engine does not start when warming up. This is an incorrect operation of the sensor indicating the temperature of the cooling water.

The fact is that when the sensor indicates the wrong temperature, the electrical unit gives the wrong command to the injectors, which inject an unnecessary dose of fuel. It often happens that the sensor simply becomes 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, it must be replaced with a new one.

READ Why Gasoline Trimmer Won't Start Video

Summary

Often, drivers of used cars are faced with the problem of not starting a hot engine. This can happen even after it has just been applied and warmed up to operating temperature. This can happen for several reasons, each engine has its own.

Recommendations for storing a gasoline trimmer in the off-season

Then you need to move the piston to the last position, then pour a small amount of oil into the plug and turn the crankshaft. If you do not plan to store a gas trimmer

During the off-season in the house, it is recommended to tightly wrap the unit’s engine with an oiled rag.

This will avoid the development of corrosion on the surface of key parts of the mechanism.

Petrol mower won't start after winter

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

It should be noted that products from such recognizable companies as STIHL, Husgvarna and other brands will not run on cheap low-octane gasoline.

Suitable fuel for them is AI grade ninety-two and higher from gas stations, and then from highly recommended ones, because gas stations also have bad gasoline.

The use of high-octane and high-quality gasoline determines how long the brush cutter will be used and how long it will last.

It is necessary to take into account another fact that with prolonged storage of a diluted fuel mixture, its working properties decrease, which also leads to consequences in which the gas cutter does not start.

As follows, it should be diluted in portions, in other words, as much consistency as is made at a time. The instruction manual correctly describes and explains the consistency ratio of gasoline and oil.

Serious adherence to the correct proportions will at least free you from several questions about why the gas cutter won’t start and what to do in such cases.

Rules for operating and storing lawn mowers

In order for the hedge trimmer to start up perfectly in the future, you need to provide it with excellent storage and operating conditions:

During operation, closely 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 instrument while it is hot; let cool;
Strictly follow the operating instructions, otherwise the engine may overheat;
If you do not plan to use the gas cutter in the next month, the fuel mixture must be drained from it, since over time it decomposes into heavy fractions that will certainly clog the carburetor passages;
After draining the fuel, allow the trimmer to idle until it stalls, this will help remove any remaining fuel mixture.

Before winter storage, follow these steps:

Completely disassemble the braid, rinse and clean all parts that are possible;
Inspect parts for damage, if necessary, eliminate distortions, tears, bends and any other defects;
Fill enough 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, raise the piston to dead center with the starter, pour a little oil into the spark plug hole and crank the crankshaft a couple of times;
If you store your hedge trimmer outside your home, wrap the motor in an oily rag.

Remember, careful adherence to the rules will allow you to forget what to start

gas cutter for several seasons. Badly.

The engine starting procedure is violated

When your Patriot gasoline trimmer, Huter trimmer or any other model does not start, you first need to refer to the operating instructions. In this small book you can find how to start an engine after winter or for the first time after purchase.

If recommendations and rules are violated, trimmer owners often encounter problems and cannot quickly start the device.

In this case, you need to take the following actions:

re-read the article or instructions;
dry the candle;
try to start the device again in the normal way.

The engine does not work, the rings are stuck

Trimmer owners rarely have to deal with this breakdown.

Usually, the rings can get stuck because low-quality fuel or a mixture that has been sitting for a long time was poured into the fuel-free tank.

The main signs of buried rings:

the tool does not start well when cold;
at idle speed the engine is unstable;
high fuel consumption.

To begin troubleshooting, you need to make sure that the problem is in the motor and only then begin to repair the device.

You can restore the rings, if they are stuck, with a burner, which needs to heat the piston in the area of these elements so that all oily deposits burn out. When the deposits are completely removed, there will be a characteristic click and the rings will peel off from the piston.

Trimmer won't start when hot

Trimmer, both electric and with an internal combustion engine (ICE). an indispensable assistant in summer and autumn for owners of summer cottages and private houses.

READ Lifan Motoblock Engine Doesn't Start

With its help, weeds, small bushes are easily removed and the lawn is trimmed. But, like any equipment, trimmers fail at the most inopportune moment.

To troubleshoot problems with your own hands, the user of this technique first needs to determine the cause of their occurrence.

Electric trimmer vibrates

Many mower users have noticed that after a while after starting the machine, it begins to vibrate a lot.

Some trimmers, most often more expensive models, have an anti-vibration system in the form of shock absorbers located between the engine and the boom. But in some cases, even this does not save you from strong vibration.

The reason for the appearance of strong vibration in the trimmer may be a small amount or complete absence of lubricant on the rigid or flexible shaft located inside the rod of the device.

The rigid shaft grease is replaced as follows:

Unscrew the gearbox located at the bottom of the rod;

After removing the gearbox, you will see the end of the shaft, which must be pulled to remove the part;

After removing the shaft, it must be generously lubricated with special grease “Shrus-4” or regular “Litol-24”;

Apply a small amount of lubricant to the shaft and distribute evenly along the entire length of the part, including the splines at the ends of the rod (if they work, the shaft will have to be replaced);
After lubrication, we insert the shaft back into the rod and put the gearbox in its original place.

The flexible shaft is lubricated as follows:

Unscrew and remove the mowing head;
Remove the rod from the electric motor by unscrewing a couple of bolts;
Pull the flexible cable out of the rod;
Lubricate the cable along its entire length with grease.

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

If lubrication does not help and vibration continues to occur, the flexible shaft will need to be replaced.

Eliminating the reasons why the lawn mower does not start

The fuel mixture must be prepared with the exact ratio of gasoline to oil. In this case

You cannot use another brand of fuel. To prevent dirt from getting in, gasoline should sit in a glass or metal container for two days. Do not use plastic containers to store fuel. It is necessary to eliminate the reasons one by one; when the Petrol Trimmer is hot, the Petrol Trimmer does not start. Accurately measure the oil with a medical syringe without a needle. Use only freshly prepared mixture and do not leave unused fuel in the tank. If the engine drips, the mower stalls; when you press the gas, the fuel may be to blame.

Insufficient compression

If the compression is insufficient, then in most cases the engine will not be able to start. You can use a car pressure gauge to check compression.

Unscrew the spark plug from the engine cylinder.
Screw the compression sensor into place.
Start pulling the starter cord as you would with a gasoline brush. Do this until the needle on the meter stops moving up. This value will show the compression force of this engine.

What compression should it be? Normally, compression should be at least eight kg/cm2. Although, even at eight kg/cm2, some engines do not idle and stall because the fuel is not pumped sufficiently. If your lawnmower does not pump above eight kg/cm2, you need to check the cylinder, piston and rings.

Also, poor compression may be due to a loose carburetor. Check if it is wobbly. If so, tighten the fasteners that hold it securely. Also, if the carburetor is not screwed on properly, you may notice that gasoline drips during operation.

Sources:

https://fb.ru/article/269335/pochemu-ne-zavoditsya-trimmer-benzinovyiy-prichinyi-i-ih-ustranenie https://dial21.ru/remont/trimmer-ne-zavoditsya-na-goryachuyu.html

Carburetor adjustment and tuning

The chainsaw must run for at least 10 minutes, since the adjustment is carried out while it is hot.
Screw H is turned smoothly to maximum speed, then turned ?, counterclockwise, reducing the speed of rotation of the engine shaft.
The idle speed is adjusted with screw T, ensuring that the scythe does not rotate.
Screw L is adjusted by first opening the throttle as much as possible, and then smoothly reducing the speed to a stable minimum.

After adjustment, a working carburetor with cleaned filters and a checked ignition should ensure engine operation. If the carburetor malfunctions, after it has been repaired, the feed system will again need to be adjusted before starting the lawn mower.

rewind spring malfunction,
broken or stuck starter pulley,
faulty starter assembly.

The most important malfunction, the elimination of which is associated with engine replacement, may be failure of the engine piston group. The cost of repairs will cost approximately 70% of the cost of the product. This video will help you understand the reasons why the lawn mower won’t start: