Why Does The Petrol Trimmer Start Badly?

How to start diagnosing lawn mowers

If the lawn mower 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;
  • Exhaust channel.

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

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 or 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 a suitable pressure gauge on it. Watch the readings: if they do not change, everything is fine, but if the pressure starts to fall, then some part of the carburetor is faulty. We’ll have to find it and replace it with a new one.

Why Does The Petrol Trimmer Start Badly?

If everything is in order with the carburetor, then the gasoline trimmer may NOT start due to wear of the piston group. Replace the piston or cylinder if chips, scratches or scuffs are found. Piston rings are subject to mandatory checks. A small LUF of the piston when the connecting rod wiggles indicates that it is time to change the rings. This procedure is best entrusted to the specialists of the service center.

Cleaning the breather

Often the engine of branded trim models stalls as a result of a clogged breather. The main task of the specified component is to equalize the pressure in the fuel tank. In case of contamination of the unit, a vacuum is formed here, which significantly complicates the supply of fuel. The problem can be eliminated by cleaning the breather with a regular sewing needle.

Diagnostics of the candle channel

What to do if the used fuel mixture is in good order, but the petrol trimmer still won’t start? The reasons for the failure of the mechanism may lie in the excessive wetting of the candle channel. To diagnose and fix the problem, you must do the following:

  • Unscrew the candle. Wipe it thoroughly and then dry it.
  • Drain excess fuel in the chamber through the appropriate plug hole.
  • Clean the old plug if there is carbon deposits on its surface. To cope with the task will allow the use of an ordinary ladies’ nail file or a file.
  • When installing the element in place, set a gap of 1 mm. To check the parameter, it is enough to place any coin in the gap.
  • Assemble the functional block back.
  • Try to start the trimmer.
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It is recommended to dry the candle channel for at least half an hour. However, in no case should you resort to calcining its elements. After all, heating the spark plug can lead to its final damage. What to do if the maintenance of the functional unit was carried out in accordance with the above recommendations, but the trimmer does not start, there is a spark? In this case, it is worth treating the threaded connection with gasoline. The latter does not need to be abundantly impregnated with fuel. It should only be slightly damp. Resorting to such actions should be taken to ensure ignition. After all, no matter how strong the spark the candle gives, there will simply be nothing to ignite in an absolutely dry chamber.

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 candle. In the absence of a spark (if there is a reliable connection between the indicated elements), the problem is most likely caused by a breakdown of the ignition unit. In this situation, you will have to turn to the services of the wizards who will reinstall the node.

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 “don’t be smart ”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). Prepares the oil-fuel mixture strictly according to the instructions. We calculate its amount based on real needs. Excess gasoline left over after work loses its quality over time.

Outlet duct diagnostics

Stable trimmer performance can be compromised by build-up of dirt in the exhaust duct or blockage in the muffler mesh. This problem most often occurs during the operation of older generation trimmer models. The issue is being solved by dismantling the anti-spark grid and cleaning it.

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, preventing the supply of fuel. Eliminate the problem 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.

Why won’t the petrol trimmer start? Causes and their elimination

Recently, the gasoline trimmer has acquired the status of one of the main tools in the arsenal of summer residents. And this is not surprising, because a motorized scythe allows you to quickly put your personal plot in order. However, it sometimes happens that the trimmer will not start hot or even cold. In such situations, you have to independently determine the cause of the malfunction. Let’s figure out what to do if the trimmer won’t start. The reasons that most often lead to such troubles will be discussed below.

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We carry out diagnostics of a candle and a candle channel

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

  • We unscrew the candle and wipe it;
  • Dry it thoroughly (not cost if ignited)
  • Excess fuel in the chamber Drain 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 set a gap with a distance of 1 mm (you can check with any coin)
  • Putting everything back in place and trying to start the trimmer.

Dries the channel for at least 30-40 minutes. Otherwise, there is a risk of re-filling and a new candle.

If the candle is working, the socket where it is located is completely dry, and the lawn mower does not want to start, lubricate the threaded connection with gasoline. It should be slightly damp. No matter how wonderful a spark the candle gives out, there is simply nothing to light up 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 weak contact between the spark plugs and the high-voltage wire. If the connection is of good quality, but there is still no spark, most likely your ignition unit has “flown”. Here you will NOT be able to do without a master, since the part is not repaired, but sold as a single unit.

Why does the trimmer start badly?

Malfunctioning electrical trimmers

Since the device of an electric mower is much simpler than a motor trimmer, there are few reasons for its failure.

It should be noted that it is better to entrust the elimination of some of them to a specialist.

Basically, the trimmer stops working normally in the following cases:

  • Faulty electrical cable;
  • The control button is faulty;
  • Burnt out motor stator winding;
  • Breakage of contact connections on the engine.

Trimmer won’t start

Like any technique, trimmers are subject to various breakdowns. Often, at the beginning of the summer season, the owners of such a tool complain that the trimmer does not start, and you have to look for the cause of the malfunction for a long time.

For those who have recently purchased a trimmer and are still familiar with this technique, information on why the trimmer won’t start and what to do in this case will be useful. So let’s find out what may be a prerequisite for this.

The main faults of the trimmers: Does not start, vibrates strongly, heats up during operation

The trimmer, both electric and with an internal combustion engine (ICE), is an indispensable tool in summer and autumn for owners of summer cottages and private houses. With its help weeds, small shrubs are easily removed and the lawn is trimmed. But, like any technique, trimmers fail at the most inopportune moment. To fix faults with his own hands, the user of this technique first needs to determine the reason for their appearance.

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The breather is a non-return valve 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 will form inside the fuel container and the fuel will no longer flow into the carburetor. To check if the valve is working, remove the hose that goes from the reservoir to the carburetor. If gas does NOT flow out of the tank, then 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: Let’s disassemble the valve and rinse all its components. On some lawn mowers, this valve may be located directly on the fuel tank. You will NOT be able to find it right away, since it is hidden from view under the starter housing. Such a breather is cleaned with a regular needle.

Breakage of petrol trimmers

Typical breakdowns of a gasoline trimmer, which the owners of this unit most often encounter, are as follows:

  • Engine breakdown;
  • Carburetor problems;
  • Fuel supply problems;
  • Muffler malfunction;
  • Gearbox breakage;
  • The starter has broken;
  • Air filter problems;
  • Gas tank breather clogged.

Fuel filter

This filter cleans the fuel from possible contamination. If it is clogged, then gasoline does NOT enter the cylinder, and, accordingly, the unit does not work or stalls after starting. The fuel filter is located at the end of the intake hose inside the fuel tank. To get to the filter, you need to remove the plug with the tubes coming out of it.

When removing the plug, the suction hose may come off and remain in the reservoir. It is removed with tweezers.

Next, remove the old fuel filter from the hose and replace it with a new one purchased in advance. You can also clean the fuel filter if you have a new one. The filter must be secured to the hose with a spring clip.

Install the intake tube on the plug and insert the last into the tank.

It should be noted that on some trimmer models, the intake hose is not in the plug, but inside the reservoir. You can remove it using tweezers or a hook bent from a wire.

Exhaust channel

The reason that the trimmer has significantly lost power, and when trying to increase engine speed, it picks up slowly, often is the clogging of the exhaust channel, through which the exhaust gases come out of the combustion chamber.

It is necessary to remove the muffler so that the burn overshoots inside the cylinder. Next, clean the exhaust channel from carbon deposits.

This must be done very carefully, do not allow carbon deposits to enter the combustion chamber.

After this procedure, the weak power of the unit and a slow increase in the speed of rotation of the mowing head will no longer upset you.

The main malfunctions of gasoline and electric trimmers

In lawn mowers and electric trimmers, apart from damage to the boom and mowing head, malfunctions mainly occur in the area of ​​the engine.