Why the lawnmower won’t start. grass trimmer does not start because of a carburetor malfunction

Reasons for gasoline and electric lawn trimmer breakdowns

trimmer for the grass, both electric and with an internal combustion engine (ICE), is an indispensable tool in the summer and autumn period for owners of summer houses and private homes. It easily removes weeds, small bushes and trims lawns. But, like any technique, grass trimmers fail at the most inopportune moment. To eliminate malfunctions with their own hands, the user of this equipment first needs to determine the cause of their occurrence.

With lawn mowers and electric grass trimmers, if we do not consider the breakdowns associated with the boom and mowing head, the faults mainly occur in the area of the engine.

Gasoline trimmer breakdowns

Typical breakdowns of the gasoline grass trimmer that owners of this unit most often encounter are as follows:

  • engine failure;
  • problems with the carburetor;
  • problems with the fuel supply;
  • muffler failure;
  • gearbox breakage;
  • broken starter;
  • problems with the air filter;
  • the breather on the gas tank is clogged.

Faults of electric trimmers

As the device electric mower is much easier than mototrimmera, then the reasons for its failure a little.

It should be noted that the elimination of some of these problems is better to trust a specialist.

Generally, the grass trimmer stops working normally in the following cases:

  • Fault in the electrical cable;
  • The control button is defective;
  • A burned-out motor stator winding;
  • The contact connections on the engine are broken.

Eliminate the cause of the mower not starting

The fuel mixture must be prepared in exact proportions of gasoline and oil. Do not use a different brand of fuel. To prevent dirt from getting into the tank, let the fuel stand in a glass or metal container for 2 days. Do not use plastic containers for storing fuel. Oil precisely measure with a medical syringe without a needle. Use only freshly mixed fuel and do not leave fuel in the tank. If the engine is fretful, the fuel may be to blame if the lawnmower cuts out when you press the gas.

lawnmower does not start on hot. pull the trigger and sharply yank the cord several times until the engine starts, then lower the trigger. does not start. need specialized repair.

Check the ignition system, if the lawnmower does not start, is carried out sequentially:

  • clean the removed spark plug from soot and dirt, dry it, set the gap of 1 mm;
  • Connect to the high-voltage wire and check the spark, yanking the starter several times;
  • If there is no spark, check for continuity of the high-voltage wire;
  • replace the spark plug;
  • Dry the spark plug duct;
  • At the same time check the work of the ignition coil, it is faulty, if the working plug does not spark.

It is in the case of a faulty ignition coil, the lawnmower does not start on hot, stops, runs intermittently.

cleaning or replacing the air and fuel filter will ensure the necessary flow of ingredients into the carburetor. The air filter can be washed in soapy water or replaced. If a nylon blade is used, it is washed, the porous felt filler is replaced. Replace the fuel filter carefully, without leaving the suction pipe open. If the engine starts with the air cleaner removed, is it possible to determine whether the air filter needs replacing? Whether you need to change the grid on the fuel supply, if the lawnmower does not start, the dry spark plug will tell you.

The breather plug, the air inlet in the gas tank. If it becomes clogged, it creates a vacuum in the tank and the mixture does not flow to the carburetor. The vent can be blown with air or cleaned with a needle. Clean the exhaust port, remove the mesh of the muffler.

The air gap and how it is set in different cases

As a template for setting the magneto gap can be successfully used a strip of the desired width and length, cut from an ordinary plastic bottle, for example, from a Pepsi-Cola.

Only it is necessary to install it last, so as not to damage during the repair work, using the same hair dryer for any purpose. After all, if it is warped by hot air, you can’t talk about accurate alignment of the magneto gap.

It is with the help of the spacer, cut out of a plastic bottle, you can accurately set the magneto gap of 0.25 mm, as its thickness is exactly the same. To be sure of this, simply fold the strip in four and measure its total thickness with a caliper, which will be exactly 1.0 mm.

We put, cut out of a plastic bottle spacer on the magnet magnets magnetto flywheel, install in place the ignition coil and fix it strong bolts 8 by 8, pre-filled with threaded holes in the housing thread locker.

It is also applied to the bolts, screwing which you must not forget to fasten the ground terminal. It is better to use an electric screwdriver. Push bolts to their limit by hand with an ordinary hand screwdriver with a hex bit, since using an L-shaped hexagon can tear off the faces of the bolt heads.

It remains, having turned the flywheel with magnets, to remove a plastic spacer and, continuing to turn it, to check quality (uniformity) of a gap at its turn from 0 to 360 degrees which at such approach turns out ideally.

Some people use a double folded xerox sheet to adjust the magneto gap, which is also acceptable, but using a spacer made of a plastic bottle gives a better result. The more so that it can be reused dozens of times.

lawnmower, start, grass, trimmer, does

All that remains is to install the housing parts and you can start the engine to test how it starts and runs.

Sometimes in the process of exploitation the units of attachment of ignition coil to the magneto body are deformed, which does not allow its reliable installation, since the holes in the coil and in the engine body do not coincide.

You can, of course, try to correct the defect, but it will be more reliable to put a new coil, especially since it does not cost too much.

All further steps are similar to the above case, except that the heads of the ignition coil screws may not be under the hex, and the wrench and Phillips screwdriver. But this does not change the point: the tightening of these bolts must be guaranteed, as in the first case.

To assess the quality of the work done, you must verify the presence of the spark between the electrodes of the plug visually after the final assembly of the engine. To do this, connect it to the mass and start turning the engine with a manual or electric starter.

The spark check has a nuance. If you sharply pull on the kickstarter, the spark will appear even if the magnetos are a little bit faulty and even if the ignition coils are completely defective. In this case, the presence of a spark is not yet an indicator of the ignition system’s goodness.

The quality of the spark formation can only be judged when it occurs, when the flywheel of the magneto does not rotate too quickly, for which the kickstarter should not be jerked, but evenly and slowly pulled.

lawnmower, start, grass, trimmer, does

Only in this case the engine of a chainsaw or a chainsaw will start without any problems, both for the first time in the morning and throughout the day (respectively, the so-called hot or cold start).

If there is no spark when the starter is moving slowly, you will most likely have to change the ignition coil, adjust the magneto gap or change the spark plug.

The clearance adjustment procedure described above has proven fully effective for chain saws and chainsaws over the last five years. There have never been any complaints from users after such a repair. This really helps when starting not only Chinese chainsaws, but also European, and even brand-name ones.

On all units, regardless of the manufacturer, setting the gap magneto 0.25 mm instead of 0.40 mm, recommended by the manufacturer, gives excellent results. Some people suggest a gap of 0.10-0.15 mm, but this is too little. Because there is a certain thermal expansion of the ignition system parts, the body itself, the crankcase of the lawnmower or chainsaw, and such a small gap can disappear at all, which can lead to a breakdown (burnout), first of all, the ignition coils. That’s why a gap of 0.25 mm is optimal from all points of view.

lawnmower does not start when cold

When starting a cold motor, it is not advisable to press on the gas. Tilt the lawnmower so that the air filter is on top, press the suction button 5-6 times, put the function selector lever in the “start” position, pull the starter cord several times until the engine starts. After a few seconds of engine operation, disconnect the starting system.

If the lawn mower has recently been in operation and has not yet had time to cool down, but does not want to start. press the gas trigger, sharply pull the starter cord several times, until the engine starts and only then release the gas trigger. If enough time has passed and the lawnmower has had time to cool down, then it is necessary to start as in the cold. If the above methods have not helped, the lawnmower does not start, then it is worth contacting a service center.

Gardening machinery repair and service.

Specialized service center “Agrotehservis”. warranty and after-warranty service of world manufacturers equipment! Attention! Information for Users!

The engine doesn’t start after the winter

Often, with the onset of spring, most owners of chain saws complain about the inability to start the motor of this tool. What can it be related to? To trimmer for grass in the spring after winter storage started up well, you need to learn how to properly care for it. How to properly store a lawnmower in winter, described in detail at the end of the material. Right now ProfiDom.com.ua will figure out why after winter it is impossible to start the engine of the tool.

One of the main reasons that the lawnmower does not start after winter is stagnant fuel in the gas tank. If you do not drain the fuel from the tank, and leave the tool stored for a long time, then naturally, it will be impossible to start the lawnmower. the oil and gasoline mix is not working properly, so the result is a breakdown of the lawn mower. Even if the trimmer has a fuel mixture from last year, it is recommended to drain it and pour a freshly prepared. After that. To carry out the start of the tool.

Another reason could be a faulty air damper. If you close the fuel valve manually, it may not work so you start the lawnmower with the choke completely open. in this case the tool will not start when cold, because there is a large amount of air suction. The video below explains why the grass trimmer does not start in the cold.

Fix 90% of Briggs lawn mower not starting problems. Easy repair.

In addition to these reasons for the inability to start the lawnmower engine, there are other reasons that are also important to mention:

  • Damping of the spark plug electrodes. before starting the grass trimmer after winter, you should unscrew the spark plug, inspect it, clean, dry and set the gap
  • High voltage cable is damaged. During storage, the high-voltage wire may have become frayed, damaged, or may have been chewed by mice. Check for intact armature wire if grass trimmer does not start after winter
  • Oxidized wire contacts. This usually happens if the tool is stored in a damp area
  • Check the ignition coil for damage. The spark plug on your lawn mower is defective and won’t start the lawn mower over the winter
  • Carburetor adjustment. it is recommended to adjust carburetor after winter. To realize this, the tool should start, so if you can not start it, it is recommended to pour 20 grams of fuel mixture into the plug hole and start the engine
  • Perform all the aforementioned actions, as, during a long period of storage may have clogged the breather hole, filters, as well as corrosion on the walls of the exhaust system

Carry out a diagnosis of the tool, and only after that, you can start a more serious repair: cleaning the carburetor.

Dry and wet spark plugs: What does it mean and how does it affect cranking?

Most tool owners immediately resort to checking the condition of the spark plug pins. This is done in order to understand from the condition of the spark plug what could be the reason for the inability to start the lawnmower engine. Based on the condition of the spark plug contacts, you can draw appropriate conclusions about what could be the cause of the malfunction. Diagnosis of the spark plug on a banzocosa is done in the following order:

  • The spark plug is unscrewed, after which it is to be inspected. Ideal condition of the electrodes. if they have brown tarnish (brick-colored). If the spark plug is wet and has black or white soot on it, it is an indicator of a problem
  • If the spark plug is wet, there is a portion of unburned fuel in the combustion chamber that does not need to be drained. Clean and dry the spark plug contacts, then make sure it is working properly. To do this, connect it to a spark plug, and place it on the surface of the cylinder. Turn on the ignition, and pull the starter grip lightly. In doing so, the spark plug should produce a quality and constant spark. If the spark is weak or there is no spark at all, then the spark plug should be replaced
  • The Grasshopper will not start if the gap between the spark plug electrodes is too big. The gap between the electrodes should be within the range of 0.7 to 1 mm. To set the gap, use a special dipstick

Important! Drying the spark plug contacts by baking them is categorically contraindicated, as this method will lead to the deterioration of the part. If there is a spark on the spark plug, but the grass trimmer does not start, then the reason is the fuel mixture in the combustion chamber. To be sure of this, you should perform the following actions:

  • fill up the cap from a PET bottle or syringe with 20 grams of fuel
  • Pour it into the combustion chamber through the spark plug hole
  • Screw in the spark plug
  • Put on the spark plug and start the engine

If the lawnmower engine starts after these actions, then the cause of the malfunction should be sought directly in the fuel line and carburetor. If the engine does not start, even after all these actions, it means that it is necessary to check the good condition of the high-voltage wire.

The high-voltage wire, as well as the spark plug, belongs to the consumables. If there is suspicion of a faulty armature of the grass trimmer, it should be replaced. If after the performed actions it is not possible to make the lawnmower engine start, then it is necessary to take into account the following recommendations:

  • If there are doubts about the serviceability of the spark plug and the high-voltage wire, it is recommended to replace them immediately
  • Check the serviceability of spark formation, and if there is no spark on the new spark plug, then the breakdown is related to the ignition unit. the failure of the coil
  • The ignition coil is not repaired, but replaced. If, indeed, the diagnosis indicates a faulty ignition coil of the lawnmower, it is not difficult to replace it with your own hands
lawnmower, start, grass, trimmer, does

If there is a spark plug, and at the same time it is dry, and the grass trimmer at the same time does not want to start, then proceed to check the next unit. air and fuel filters.

Important! If the electrodes of the spark plug have a red or pink color, it indicates that the fuel used contains a large amount of additives. It is necessary to refuse such fuel, having changed a filling station or brand of gasoline.

grass trimmer does not start after winter

What to do in such a situation? No need to worry and panic. This is a very common problem, which is solved in literally 3-4 minutes. First of all, if the gas tank is left with last year’s fuel, it must be drained. Gasoline loses its octave properties already after 2 weeks of idle time. Secondly, start the lawnmower after a long stagnation need a slightly different way. First you need to open the choke and pump a little fuel mixture into the carburetor, then pull the handle until you feel a slight resistance. After that you can start the grass trimmer.

If the grass trimmer starts but immediately stops when you try to start it, the air filter could be the cause again. You need to take it off and check whether it is clogged with dust. If this is indeed the case, you need to clean it thoroughly or buy a new one. The problem can also be a faulty ignition coil. In this case, it is best to take the mower to a service center.

Proper chainsaw care

There are no superfluous phrases in the instruction manual, all that is suggested is for the trouble-free operation of the gasoline pump. Cleaning all parts after each cycle makes it easier to remove uncured residue and dirt. Clean only cooled components. This method promotes quality air cooling of the engine and gearbox.

You must use fuel with the recommended oil in the instructions for refueling. If the fuel mixture remains in the fuel tank, the oil will float and, at startup, land on the damper, impairing its adjustment. Mixture can settle and clog fuel in the carburetor.

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

It is impossible, dangerous to the tool and the health of the mower, to use a metal cable instead of a fishing line. It cuts more efficiently, but the stress on the gear and motor increases. A worn piece of wire flies at the speed of a bullet while disengaging. Efficient mowing can cause rapid wear on the engine piston group. For more efficient mowing, it is suggested to use the “star” line profile.

During the care of the garden, sometimes people have to deal with the fact that their lawn mower does not start. There are several reasons for the failure of this tool.

How to Fix a Trimmer That Won’t Start!

Lawn mower won’t start. causes

Improper storage, long breaks in operation, improper maintenance and other factors can cause the lawnmower not to start.

Diagnosis of causes should begin with checking major components. fuel tank, spark plugs and spark plug duct, air and fuel filters, breather, exhaust duct. Most often the problems are related to one of these nodes, and a thorough inspection of them will help determine why the lawnmower won’t start.

If you use low-quality fuel (below Ai-92), it can cause damage to the cylinder-piston system, the repair of which will cost about a third of

It is also important to keep the correct ratio of gasoline to oil as stated in your specific model’s owner’s manual

lawnmower, start, grass, trimmer, does

Engine operation can also be impaired by a dirty fuel filter. If you find this problem you need to replace the filter. It is also good to check the air filter. If it is dirty, you need to dismantle it, wash it in water with detergents, dry it, lubricate it in oil and put it back. Spark plugs that do not show any sign of life should be replaced.

Sometimes the lawnmower starts normally, but then stops. This is mostly due to improper carburetor setup or misalignment. You can tell that this is the reason by the vibration that you can feel when working. Adjust the fuel setting by following the instruction manual of the tool.

Lawn mower does not run hot

When the lawn mower is working properly and won’t start again after a short break, squeeze the throttle trigger and pull the starter cord sharply several times until the engine starts and only then release the throttle trigger.

Lawn mower does not start when cold

On the contrary, it is not recommended to press the gas when starting a cold brushcutter. You need to tilt the lawnmower so that the air filter is at the top and press the choke 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 the grass mower has been running for a few seconds, the start system can be turned off.

What to do if the lawnmower does not start ? In this article we will look at the main causes of this failure.

often than not, the lawnmower refuses to start because the fuel fills the spark plug. This can be because the worn out nozzles supply too much fuel into the combustion chamber and the excess fuel floods the spark plug, so it can not generate a spark. If the spark plug is always wet, it may indicate that the gaskets are worn, so that the leaking oil prevents the spark formation. If the spark plug is dry and the lawnmower still won’t start, first you need to replace the spark plug.

Another widespread reason is that a 4-stroke lawnmower refuses to start when it is hot. We can recommend a simple test: pull the starter cord by pulling the trigger. If after that the engine still does not start, then your tool needs a more detailed diagnosis followed by a specialized repair.

How to store your lawnmower properly and avoid problems with starting it

Proper approach to storing the grass trimmer determines its start. And it concerns not only the winter long storage. When storing chain saws and trimmers, you need to consider a number of the following rules

  • Before putting the tool away for winter storage, you should drain the fuel from the tank. In addition, fuel residue must also be removed, and this can be done by starting the engine, letting it run for a while until it stalls
  • It is desirable to store the tool in a dry room
  • Before starting the engine after a long pause of more than 2-3 months, you must first inspect the electrodes of the plug, as well as check the main nodes. air filter, high-voltage wire, and so on
  • When using the tool, it is necessary to take into account that overheating of the motor negatively affects the service life, so you need to take breaks when working, especially if the grass trimmer with a two-stroke engine is used for work. Units with four-stroke motors are not only more powerful, but also more durable
  • After the winter the first thing to do is to put some oil in the spark plug hole by dragging the piston to its top dead center. This is necessary in order to lubricate the parts of the cylinder head when starting the engine, thereby excluding their rapid wear and tear

Only, with the right approach to finding the reasons why the grass trimmer does not start, you can find and eliminate the breakdown on your own. over, you do not need to be an expert to do this, and understand in detail the design of gasoline units. Act in order of the sequence presented in the material and it will be easier to restore the lawnmower to work.