Why the grass trimmer won’t start

grass, trimmer, start

Important assemblies

In the warm season, many dachniks and owners of private houses seek to understand on their own why the grass trimmer does not start. The causes of malfunction of such a unit can be very different. To eliminate it, you need to understand what nodes this equipment consists of.

To start the gasoline trimmers are used hand starters. These components are used to move the crankshaft. The ignition of the first portion of fuel entails starting the engine, after which the grass trimmer is ready for operation. Efficient machine operation is only possible when all critical components and mechanisms function properly.

Situations often arise when the machine simply won’t start. In such a situation, without quality diagnostics just can not do without. Specialists have described a special sequence of actions, thanks to which you can understand why the gasoline mower does not start in the hot or even in the cold. Diagnosis of the grass trimmer consists of several important steps:

  • The first thing to do is to make sure that there is fuel in the tank, and check its quality.
  • Determine the color of the spark plug.
  • Be sure to check the air filter for proper operation.
  • The fuel filter is responsible for high-quality gasoline and oil purification. The mixture should flow as evenly as possible into the carburetor.
  • Make sure that the breather is working properly.
  • If all of the above options did not help fix the situation, then there is still a need to check the muffler.

All of the above-mentioned multifunctional nodes can be source of trouble starting the grass trimmer. complicated breakdowns can be associated with the multifunction carburetor, which also needs periodic cleaning. If the user is not confident in his abilities, then it is better to entrust all repair work to professionals, who will quickly find and eliminate the main cause of the equipment malfunction.

Reasons why a new grass trimmer won’t start

Difficulties with starting arise not only in the seen kinds of string trimmers, but also in brand new. In this situation there is only one way out. to listen to the advice of our experts and use their practical experience!

The reasons why the new gasoline grass trimmer does not start, eliminates the instructions for starting the brushcutter from forum members, which sounds like this:

  • Switch on ignition.
  • To pump the fuel with a silicon button (primer) on the bottom of the carburetor. You need to do as much (or a little more) than written in the manual, usually about 8-10.
  • Close the choke.
  • Secure the throttle lever with the stop button at high revs.
  • Pull the starter handle 2-3 times. The engine should kick in.

If the engine “seized” and stalls, it is necessary to move air valve in 1/2 position and try to start the engine again. If the engine has started, we drop the gas and move the air damper to the “open” position. The grass trimmer starts easily. Start the engine.

When turning on the fuel do not be afraid of overflowing. If this happens, and “fill up the plug”, then unscrew it, it is enough to move the air damper to the “open” position and holding full throttle simultaneously scroll the engine with the starter 2-4 times. After that you may start the engine and proceed to mowing without fear that it will stall.

The continuous operation time of the lawnmower is specified in the instruction manual of the grass trimmer. On average, we mow for 15-20 minutes, after which you need to turn off the trimmer to the grass and give him 3-5 minutes to cool down. The weather and operating conditions also have a key influence on the amount of time the machine will run continuously. In hot weather, when mowing tall grass, overgrown weeds, under heavy load, the grass trimmer overheats faster, does not work and is hard to start after a break.

Checking the presence and quality of fuel

If you do not understand why the lawnmower does not start, make sure that there is fuel in the tank. Often, beginners forget that it is necessary to pause periodically to refuel the tool with a gasoline-oil mixture. If the mower tank is empty, then of course it will not start, no matter how much you try to do this.

If there is fuel in the tank but it is not possible to start the mower, do not take the time to disassemble the carburettor. Make sure to start the grass trimmer engine correctly, as indicated in the manual. If the start is done according to the instructions, then, it is important to consider the following points:

  • Do not just use high-quality gasoline with a maximum octane rating, but exactly the brand recommended by the manufacturer. And not always this brand is gasoline AI-95. If you do not know what kind of gasoline to use for the lawnmower, then choose AI-92
  • Oil must be special. for two-stroke engines. If the lawnmower has a four-stroke motor, it should be filled with pure gasoline without stirring with oil. You should not save on the quality of oil for the grass trimmer engine, as well as on gasoline. After all, the operational life of the motor depends on the quality of the fuel used
  • Proper preparation of the fuel mixture. Observations show that most mowers only at first control the process of preparing oil with gasoline for the grass trimmer. The more experience the mower has, the less attention is paid to the process of mixing gasoline with oil for a two-stroke engine. The ratio of gasoline to oil should be as recommended by the manufacturer. Normally, the ratio is 25 to 1, that is, you need 40 ml of two-stroke oil per 1 liter of gasoline (car engine oil and especially waste oil cannot be used)
  • Proper storage of fuel mixture. It often happens that after the fuel mixture is prepared, it stands for a long time more than 2 weeks. ready mix of petrol and oil should not be stored for a long time, because it causes oil to precipitate, and thus the properties of both oil products are lost. Even careful stirring after a long storage time of the ready mixture is not a reason for its further use. That is why it is not recommended to mix more than 2 liters at a time
grass, trimmer, start

Make sure that all the above points have been met, and only then can you proceed to check the condition of the spark plug. Grass trimmer does not start for a variety of reasons, and most of them can be identified by yourself. It is simply not rational to disassemble the carburetor if it is impossible to start the engine. The next step on the way to troubleshooting is to check the condition of the spark plug.

How to Fix a Trimmer That Won’t Start!

The chain saw likes cleanliness. You have to make sure the air filter and fuel are clean. It is better to leave gasoline, bought at the gas station, for 2 days and pass a piece of baize cloth through a simple filter.

Check the electrics as follows:

Unscrew the spark plug, inspect the gap between the electrodes. The correct gap between the electrodes can be set in the old-fashioned way. We take a razor blade, break it in half and put the home-made dipstick between the electrodes. If the blades fit tightly, the clearance is perfect.

Put the spark plug wire cap on the spark plug and lean it against the metal surface of the engine. Pull the starter a few times. If the spark beats well to one point, then the gap is adjusted correctly. If no spark is weak or wandering, the electrode gap must be readjusted.

The main thing is the fuel mixture!

In this case the remains of the plastic dissolved in the brutal environment do such awful things in the combustion chamber that you can’t do without a complete overhaul of the mechanism for sure. You’ll always remember the correct way to store the fuel.

What to do when the fuel was exactly normal, the spark is there, but the grass trimmer gasoline does not start? You may have simply filled the spark plug with gasoline. In that case it should be turned out, wiped with a clean rag and dried. In general, when the grass trimmer began to get naughty and stall, why doesn’t the grass trimmer start. By the way, it is not unreasonable to check the spark plug itself.

To ensure that the unit is always in a functional state, it is worth following a few simple rules:

  • Carry out timely, regular inspections of the main mechanical components.
  • Fill grass trimmer only with fresh fuel, the quality and origin of which is not in doubt.
  • Check after each use for oxidation and deposits on the ignition components.
  • Do not subject the grass trimmer to high stress when working.

To keep your machine in good working order, you need to properly prepare it for storage during the winter period. First of all disassemble the instrument completely, then wash and clean the components. It is also important to inspect the functional units for damage, if necessary eliminate deformation of parts, all sorts of misalignment, torn materials.

Causes of breakdowns of gasoline and electric trimmers

Grass trimmer, both electric and with a combustion engine (ICE), is an indispensable tool in the summer and fall for owners of summer houses and private homes. Grass trimmer is ideal for feather edging, weeding, small bushes and lawn mowing. 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 appearance.

New chainsaw or gasoline trimmer (lawnmower) may not start.

If you pump too much fuel, trying to start with a cold start and a hot start. Cool down! Open the carburetor choke to work on a “hot start” and start the machine holding the fuel trigger at maximum, and when starting try to reduce the speed to just above idle to warm the engine tool. usually 30-45 seconds is enough for warming. Another example, when the fuel mixture is pumped. turn the chainsaw over so that the muffler is at the bottom. Mixture may start dripping out of it. This is also the cause of the chainsaw not starting. You can see exhaust fumes when you start, but don’t pump it, the saw will start after a while. The next day a chainsaw or lawnmower, if stored in a warm, non-humid place, will usually start from the working position, try. Failed to start, then do everything scientifically starting with a cold start. Fuel filter in the tank. Check that it works. But don’t leave the inlet without filter. It makes sense to check the air filter as well. It is necessary to remove the air filter and try to start without it. If it starts, you either need to clean and flush the old filter or install a new one.

There are two more tips from experienced users of inexpensive brushcutters:

The lawnmower starts easier if you put it on the side with the air filter up so that the mixture obediently falls down into the carburetor, and you can also remove the air filter, drop 1-2 drops of mixture into the carburetor, put the filter back and oh miracle. Starts! If you again failed to start, then you should unscrew the spark plug, dry the combustion chamber. At the same time check the spark plug for serviceability. It can fail unpredictably. One unfortunate cause is a bad spark plug. So, the spark plug turns out to be serviceable. What do we do?? If the warranty period has passed, to go to the service far away and there is no desire, you can still do some steps to reanimate the tool with your own hands. If there is no trace of mixture on the spark plug, the spark plug is dry, it means that the mixture is not getting into the engine cylinder from the carburetor. But it’s still worth checking the spark plug’s work finally. Pour some mixture straight into the cylinder and screw in the spark plug. Make a few attempts at ignition. There’s no need to pull the starter grip all the way out, you could break the starter mechanism. With serviceable spark plug the engine will start, will run a little bit and will stop. that’s right. It means that the carburetor does not let the mixture in. It happens so that to save money the user buys petrol where it’s cheaper. At such gas stations it is possible that water gets into the gasoline. That’s the kind of gasoline they sold you.

Or storage of gasoline or mixture was for some time in a container with the lid open at high air humidity, or even even a drop of water got into the mixture. One little drop of water in the carburetor is enough to ruin its smooth operation. If the user tries to save on fuel additive (oil for 2-stroke engines) the situation worsens, because such oil dissolves worse in gasoline. in the carburetor a thin film is formed on the fuel filter in the carburetor. The flow of the mixture is severely restricted or stopped. The carburetor in brushcutters and chainsaws is a very delicate mechanism. Remove and disassemble the engine with care. We disassembled it in a low-dust room, blew out, dried it, washed the fuel filter screen (very carefully)!) if contaminated. For gasoline technology with a service life of 1-2 years is enough, just assemble and start. Start by all the rules of science. cold start, hot start. And here is a universal advice for starting up a chainsaw or brush cutter and even a snow blower (if the spark plug is serviceable, air and fuel filter clean, fresh mixture of petrol and oil in the appropriate proportion). close the carburetor air damper, 2-3 starter movements, open the carburetor air damper (fully), 2-3 starter movements. So to repeat. After 3-5 cycles, it will start.

Excluding lawnmower filter malfunction, as discussed in a previous publication, it is necessary to check the breather valve. The breather is the part that is responsible for normalizing the pressure in the tank. When the fuel flows gradually from the tank to the carburettor, the pressure increases (vacuum is created). In order to discharge the vacuum inside the tank, the breather valve, a kind of valve that is located on the tank lid of the tool, is used. This valve has a filter element, through which the air entering the tank is filtered.

Over time, the filter gets clogged and causes a vacuum in the gas tank. Trite, but in 30% of cases the grass trimmer failure, in the form of inability to start it, is associated with a clogged breather. The breather valve on the trimmer can be cleaned and the tool can be used again. To make sure that the grass trimmer malfunction is caused by the breather is as follows:

  • Unscrew the cap of the gas tank
  • If at unscrewing it air bleeds, it is 100% sure that the breather plug is out of order
  • Screw the cover and start the lawnmower engine. If the grass trimmer starts, but stops after a while (when the amount of fuel in the tank is reduced), it is necessary to clean the breather

The breather plug can be cleaned with an ordinary sewing needle. Many people don’t even know about this important detail, so they often don’t understand what to do when the lawnmower engine won’t start. Answering the question about the breather plug influence on engine starting, it is necessary to say that it has a direct impact. Excessive pressure in the tank prevents the fuel flow to the carburetor, so the engine does not start.