Trimmer Does Not Start Causes Candle Dry

Filter diagnostics for lawn mowers

Another prerequisite for stalling a gasoline scythe can be an air filter. To eliminate it, try removing the filter and starting the trimmer without it. If it works out, then you will have to change the air filter to a new one, or at least blow and thoroughly clean the old one.

The petrol trimmer may not start due to a dirty fuel filter. 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 inlet without a filter at all, this is prohibited by any instruction manual. Haste can turn into repair of the engine piston group.

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.

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.

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.

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.

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 The Lawn Mower Won’t Start. Troubleshooting

Caring for the personal plot, summer residents periodically encounter the fact that the lawn mower 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 SEPARATE parts.

  • How to start diagnosing lawn mowers
  • Checking the fuel mixture
  • We carry out diagnostics of a candle and a candle channel
  • Filter diagnostics for lawn mowers
  • Breather and exhaust port
  • complex reasons for lawn mowers failure
  • Rules for the operation and storage of lawn mowers

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). Prepares the oil-fuel mixture strictly according to the instructions. Calculate its amount based on real needs. Excess gasoline left after work loses its quality over time.

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 may be impaired due to dirt entering 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.

Rules for the operation and storage of lawn mowers

In order for the lawn mower to start well in the future, you need to provide it with good storage and operation conditions:

  • During operation, carefully monitor the cooling system, carefully and in time clean the channels in the housing, as well as the ribs of the starter;
  • If necessary, use solvents, kerosene and other detergents for cleaning;
  • DO NOT clean the tool “hot”. let it cool;
  • Strictly Follow the instructions for the operating mode, otherwise you may overheat the engine;
  • If you do not plan to use the lawn mower in the next month, the fuel mixture must be drained from it, because over time it breaks down into heavy fractions, which will definitely clog the carburetor channels;
  • After draining the fuel, let the trimmer run at idle, until it stalls, this will help completely remove the remaining working mixture.
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Before winter storage Proceed as follows:

  • We will completely disassemble the braid, Rinse and clean all the details that you can;
  • Inspect the parts for damage, if necessary, eliminate distortions, tears, bends and any other malfunctions;
  • Fill a sufficient amount of oil into the gearbox and clean the air filter;
  • You can partially disassemble the motor, rinse, blow out and grease all moving parts;
  • In order to lubricate the piston, you need to Unscrew the spark plug, raise the piston to the dead center with the starter, pour a little oil into the spark plug hole and turn the crankshaft a couple of times;
  • If you are storing the lawn mower outside the house, wrap the engine with oiled rags.

Insufficient compression

If the compression is insufficient, then start the engine, in most cases, will not work. To check the compressions, you can use a car compressor.

  • Unscrew the spark plug from the internal combustion engine cylinder.
  • Screw the compression gauge in its place.
  • Begin tugging on the starting cord as you would when starting lawn mowers. Do this until the arrow on the measuring device stops moving upward. This value will show the compression force of this engine.

What compression should be? Normally, the compression should NOT be lower than 8 kg / cm 2. Although even at 8 kg / cm 2, some engines do not idle and stall, as the fuel is not pumped sufficiently. In case your lawn mower does NOT pump above 8 kg / cm 2 then you will have to check the cylinder, piston and rings.

Also, poor compression can be due to poorly tightened carburetor. Check if he is wobbling. If so, well tighten the fasteners holding it. Also, if the carburetor is poorly screwed on, you may notice that gasoline drips during operation.

Electric trimmer vibrates

Many mower users have noticed that some time after the start of the machine, it begins to vibrate strongly. Some trimmers, mainly in 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 it does NOT save from strong vibration. The reason that strong vibration appears in the trimmers may be a small amount or a complete absence of lubrication on a rigid or flexible shaft located inside the rod of the apparatus.

Rigid shaft lubrication is changed 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 abundantly lubricated with special grease “Shrus-4” or the usual one. “Litol-24”;
  • Apply a small amount of grease to the shaft and smear it evenly along the entire length of the part, including the splines at the ends of the rod (if they come off, the shaft will have to be replaced)
  • After lubrication, 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 out the flexible cable from the rod;
  • Lubricate the entire length of the cable 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, you should apply lubricant to the part and distribute it evenly over the surface. Then insert the flexible shaft rod into the electric motor and secure it.

Breather

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.

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.

Malfunctioning electrical trimmers

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

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

  • Electrical cable malfunction;
  • The control button is faulty;
  • Burned out motor stator winding;
  • Breakage of contact connections on the engine.

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;
  • Breakdown of the gearbox;
  • The starter has broken;
  • Air filter problems;
  • Gas tank breather clogged.

Air filter

In the event that your lawn mower does not start well or immediately stalls after starting, pay attention to the air filter, as it can be clogged, as a result of which air does NOT enter the combustion chamber and the fuel does not ignite. To check if the filter has a case, remove it and try to start the engine. If it works, then the reason has been found. The filter needs to be replaced or rinsed well and dried before installation. In the event that you find oil in the air filter, it must be washed with gasoline, squeezed well and dried for at least 2 hours before reinstalling.

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If, when the air filter is removed, the unit still does NOT start, then it is recommended to check the fuel filter.

Why Petrol Trimmer Won’t Start

The reasons why the petrol trimmer stopped starting may be different, so a step-by-step diagnosis of the device is required.

Candle and candle channel

So you’ve changed the fuel, but nothing has changed, and the trimmer still won’t start. In this case, it is worth checking the candle channel to see if it is filling it with a combustible mixture. Often, users turn the choke to the “OFF” position at start-up and when the engine starts, rather than turning it to the “ON” position, after which it stalls. Further, an attempt to restart the internal combustion engine leads to the fact that gasoline fills the candle, and the start becomes impossible. To diagnose and fix a possible problem in this node, do the following.

  • It is necessary to Unscrew the spark plug, wipe it well and dry it. When installing the spark plug into the internal combustion engine cylinder, it must be dry.
  • Drain the accumulated fuel from the combustion chamber. This is done through the hole from which you unscrewed the candle.
  • If there is carbon deposit on the electrode of the candle, it must be removed either with a thin file or with a nail file.
  • Do not forget to set the gap between its electrodes before installing the part. The gap on the spark plug should be 1 mm. You can use a coin as a probe to check the gap.
  • Next, Assemble the unit, read the starting instructions and try to start the engine again.

If the GIS does not start, then you need to check the Spark. For this:

  • Unscrew the candle;
  • Put a cap of a high-voltage wire on it;
  • Touch its metal part to the cylinder body (to ensure contact, you can insert a tubular key) as shown in the figure below;
  • Pull the starter cord so that several engine revolutions occur.

Normally, with each piston weft, a spark should slip between the electrodes of the plug. If there is a spark, then the reason that the GIS does not start should be looked for in other nodes of the device.

For a better understanding of the process of how to test a candle for a spark, you can use this. Where the check is shown on the example of the Soyuz lawn mowers.

If there is no spark, then first check the cable connecting the candle to the coil. perhaps the reason is in it. You can call him using a tester. If an open circuit is detected, the high-voltage wire will need to be replaced.

Also, a prerequisite for the missing spark may be a malfunction of the ignition coil (magneto). The picture below shows what the coil (magneto) looks like from a Patriot petrol trimmer (Patriot).

To exclude a malfunction, you will need to check the trimmer magneto with a tester, namely, its primary and secondary windings. On the primary winding, the resistance should be between 0.4 and 2.0 ohms. If the device shows 0, this means that a short circuit has occurred in the winding, and if infinity is a clear sign of an open circuit. The resistance on the secondary winding must be between 6 and 8 kΩ.

The lawn mower starts and stalls. What to do?

There is a spark, and everything seems to be normal, but the lawn mower does not start, in such cases you should check the air inlet valve to the fuel tank. Clogged valve leads to the creation of a vacuum in the tank, in which the carburetor does not receive gasoline, so the lawn mower will start, but then stall.

To exclude this reason, you need to clean the valve and try to start the lawn mower C with an incompletely twisted tank cap.
2. If the lawn mower does not start at the same time, remove and clean the fuel filter, as well as check all parts of the carburetor, then try to start.

Again The lawn mower will not start, the air filter is disconnected, try to start without it, if the mower starts, then the reason is in the air filter, replace it.

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.

Off-season petrol trimmer storage tips

When storing the trimmer, it is worth filling the gearbox with enough oil. Then you need to clean the air filter, partially disassemble, blow out and rinse the engine of the unit. Has dried all mechanisms, the moving elements should be lubricated. To process the piston system with oils, you must first remove the spark plug.

Then you need to move the piston to the extreme position, then pour a small amount of oil into the spark plug hole and rotate the crankshaft. If you do not plan to store the petrol trimmer in the off-season in the house, it is recommended to tightly wrap the engine of the unit with oiled rags.

This will avoid the development of corrosion on the surface of the principal components of the mechanism.

Electric trimmer vibrates

Many mower users have noticed that some time after the start of the machine, it begins to vibrate strongly.

Some trimmers, mainly in 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 it does NOT save from strong vibration.

The reason that strong vibration appears in the trimmers may be a small amount or a complete absence of lubrication on a rigid or flexible shaft located inside the rod of the apparatus.

Trimmer Does Not Start Causes Candle Dry

Rigid shaft lubrication is changed 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 abundantly lubricated with special grease “Shrus-4” or the usual one. “Litol-24”;
  • Apply a small amount of grease to the shaft and smear it evenly along the entire length of the part, including the splines at the ends of the rod (if they come off, the shaft will have to be replaced)
  • After lubrication, 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 out the flexible cable from the rod;
  • Lubricate the entire length of the cable with grease.
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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, you should apply lubricant to the part and distribute it evenly over the surface. Then insert the flexible shaft rod into the electric motor and secure it.

In the case when the lubrication does not help, and vibration continues to appear, you will need to change the flexible shaft.

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.

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 must not 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. It is necessary to eliminate the causes one by one, the lawn mower will not start on a hot trimmer. Measure the oil accurately with a medical syringe without a needle. Use only freshly prepared mixture. Do NOT leave used 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 lawnmower does not start well when hot

The engine does not start well when it is hot

There are situations when the car does not start, after it worked, it stood for only a couple of minutes. Drivers of completely different cars face such a problem.

In the main, this happens precisely on gasoline engines.

Regardless of what the engine is running on, a carburetor or with an electric control unit, there is such a discrepancy as the engine does not start well on hot or does not start at all on hot.

Troubleshooting strategy

Where to start troubleshooting if the trimmer won’t start? In situations where the tool stalls immediately after starting, it is worth inspecting the following components of the unit:

  • Fuel tank;
  • Spark plug;
  • Fuel and air filter;
  • Outlet channel;
  • Breather.

It is the breakdown of the above locations that most often leads to the fact that the trimmer does not start well. Let’s look at how to eliminate such troubles.

Candle and candle channel

So you’ve changed the fuel, but nothing has changed, and the trimmer still won’t start. In this case, it is worth checking the candle channel: does it throw a combustible mixture over it.

Often, users turn the choke to the “OFF” position at start-up and when the engine starts rather than to the “ON” position, after which it stalls.

Further, an attempt to restart the internal combustion engine leads to the fact that gasoline fills the candle, and the start becomes impossible. To diagnose and fix a possible problem in this node, do the following.

  • It is necessary to Unscrew the spark plug, wipe it well and dry it. When installing the spark plug into the internal combustion engine cylinder, it must be dry.
  • Drain the accumulated fuel from the combustion chamber. This is done through the hole from which you unscrewed the candle.
  • If there is carbon deposit on the electrode of the candle, it must be removed either with a thin file or with a nail file.
  • Do not forget to set the gap between its electrodes before installing the part. The gap on the spark plug should be 1 mm. You can use a coin as a probe to check the gap.
  • Next, Assemble the unit, read the starting instructions and try to start the engine again.

If the GIS does not start, then you need to check the Spark. For this:

  • Unscrew the candle;
  • Put a cap of a high-voltage wire on it;
  • Touch its metal part to the cylinder body (to ensure contact, you can insert a tubular key) as shown in the figure below;
  • Pull the starter cord so that several engine revolutions occur.

Normally, with each piston weft, a spark should slip between the electrodes of the plug. If there is a spark, then the reason that the GIS does not start should be looked for in other nodes of the device.

For a better understanding of the process of how to test a candle for a spark, you can use this. Where the check is shown on the example of the Soyuz lawn mowers.

If there is no spark, then first check the cable connecting the candle to the coil. perhaps the reason is in it. You can call him using a tester. If an open circuit is detected, the high-voltage wire will need to be replaced.

Also, a prerequisite for the missing spark may be a malfunction of the ignition coil (magneto). The picture below shows what the coil (magneto) looks like from a Patriot petrol trimmer (Patriot).

To exclude a malfunction, you will need to check the trimmer magneto with a tester, namely, its primary and secondary windings. On the primary winding, the resistance should be between 0.4 and 2.0 ohms.

If the device shows 0, this means that a short circuit has occurred in the winding, and if infinity is a clear sign of an open circuit. The resistance on the secondary winding must be between 6 and 8 kΩ.

On some coils it can reach 15 kΩ.