Why the grass trimmer does not start: causes and solutions

It’s time to mow the lawn but the lawn trimmer does not work? It’s scary to think how you can keep your lawn in perfect condition with a hand tool, especially when you haven’t had to do it before. If the grass trimmer does not start, the reasons can be very different, but most of them you can fix yourself.

You don’t need any special tools or specialized knowledge. A little courage and free time to read this material. and the grass trimmer will not need to take to the master.

In this article, we will tell you how to determine what is preventing the start, give instructions for repairing each node and recommendations on how to avoid problems in the future. For clarity, there are a photo and video, where the most common breakdowns are clearly disassembled.

Why does the chainsaw stall when hot?

The situation in which the chainsaw starts up in the cold, but can stall while heating up, is familiar to many who deal with them. The main reasons for such saw behavior are.

Check the ignition coil with a multimeter or by replacing it with a known faulty. Check the multimeter with the primary and secondary windings in the resistance measurement mode. The value of resistance of the primary winding, the work coil, is 1 kOhm. secondary 4 kOhm.

Useful information for those who don’t start their grass trimmer after winter

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Why the weed trimmer does not start after the winter ? What are the main causes of the problem??

The gasoline trimmer may not start because of the last year’s fuel left in the tank, which, simply put, is exhausted. This can be indicated by two signs: the spark plug is dry and there is a spark. To fix the problem, you just need to change the fuel.

In addition, the gasoline grass trimmer after winter starts a little differently. Open the choke and pump some gasoline into the carburetor, then pull the handle back until you feel some resistance. After that, it’s safe to start.

The air filter can get clogged with prolonged idle time. Evidence of this can be a “hot start”, after which the grass trimmer immediately stops. The filter may have become clogged with dust during the cold season. You have two options here: first you need to clean it, and if that does not help, you need to buy a new filter.

How to Fix a Trimmer That Won’t Start!

What to do in this case? It is best to take the grass trimmer to a service center.

A new chain saw or gasoline trimmer (lawn mower) may not start.

If the fuel mixture is pumped, trying to start the engine from a cold start and a hot start. Freeze! Open the carburetor choke to work on “hot start“, and start the technique by holding the fuel trigger to the maximum, and when starting try to reduce the speed to just above idle to warm up the engine tool. 30-45 seconds is usually enough to warm up.

Another example of when the fuel mixture is pumped. Turn the chain saw upside down so the muffler is on the bottom. It may start to drip. This is also the reason why the chain saw won’t start. You can see the exhaust gases when starting, but it won’t start. It needs to be pumped on a “hot start” and the saw will start after a short time.

The next day, a chainsaw or lawn mower, 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. You need to check its functionality. But don’t leave the inlet with no filter.

It also makes sense to check the air filter. Take off 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 other tips from experienced users of inexpensive brushcutters:

lawnmower starts easier if you put it on its 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 on 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 of the annoying reasons. spark plug is not working.

So, the spark plug turns out to be serviceable. What to do? If the warranty period has passed, in the service far to go and 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 does not enter the engine cylinder from the carburetor. But it is still worth checking the work of the spark plug. Pour some mixture directly into the cylinder and screw in the spark plug. Make a few attempts at ignition. It is not necessary to pull out up to the stop the winding handle, you can break the starter mechanism. With a good spark plug the engine will start, run a bit and then stall. that’s right. So the carburetor isn’t leaking the mixture.

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Sometimes it happens that out of economic reasons the user buys gasoline where it’s cheaper. Water can get into the gasoline at such gas stations. That’s the kind of gas they sold you.

Or petrol or mixture was stored for some time in a container with the lid open at high air humidity, or 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 petrol. A thin film forms on the fuel filter in the carburetor. The mixture flow is severely restricted or interrupted.

Carburetor in brushcutters and chainsaws. A very delicate mechanism. Remove and disassemble the engine carefully. Disassembled in a low-dust room, blew out, dried, fuel filter grid washed (very carefully!) if contaminated. For gasoline equipment with a lifetime of 1-2 years is enough, just assemble and start. Start by all the rules of science. Cold start, hot start.

But here is a universal advice for starting up a chainsaw or brush cutter and even a snowblower (if the spark plug is serviceable, air and fuel filter is clean, and the mixture of gasoline and oil is fresh in the appropriate proportion). close the carburetor air damper, 2-3 starter motor movements, open the carburetor air damper (fully), 2-3 starter motor movements. Repeat like this. After 3-5 cycles will start.

Chinese lawn mower does not start.Diagnostics and repair.

Diagnostics and repair of a Chinese brushcutter. Repair of carburetor, lawn mower after standstill.

For a Chinese chainsaw, 7 thousand is a normal price?

The spark plug is primed and the lawnmower will not start Please advise what could be the reason, thank you

Has been used in bad oil, causing deposits like these?

Keep shooting more videos about grass mowers and other machinery.

Please tell me what the problem is, the hot engine does not start! Just bangs either in the muffler or through the carburetor. There are so-called “vibrations” through the exhaust even with half a minute. The reason is in the ignition? First tank of gasoline is gone. Poured the other. bang, bang, bang, I never stopped. Completed the tank perfectly (not full of 600 grams), tried to turn off and start at once. started like an old man! While I poured the third dose of gasoline. it went 5-10 hrs. I started. does not start and that’s it! It has lingered for a while! Cranking and cranking. no effect.

Very useful video, thank you, but tell me. I have this problem has a spark but when I try to start it by unscrewing the plug, it is dry, it turns out that the fuel does not come? What could be the reason?

why you can’t blow out the valve jets?

changed the piston in the gasoline mower and it will not start.Poured gasoline under the plug also does not start

Hello I have this problem, lawn mower tiller does not start or start well does not pick up speed, adding gas stalls, what to do, please tell me

Good afternoon, please tell me what may be the reason when the engine is cold lawn mower does not start, when hot is good?

Good day. I have a Chinese Champion grass trimmer that has no regulating screws on the carburetor, how to adjust the carburetor?

I have a chinese grass trimmer I need to use a starter and the carburetor needs to be disassembled to clean?

I have a mower that runs on the engine when I turn off the engine Ana stalls

I had this problem too and noticed by accident. For some reason the plastic stuff shrivels up and the diameter decreases.

please tell me. the Chinese grass trimmer when you start the starter. The cutting attachment and blade stop spinning. Grass trimmer works. but there’s no idle. I can’t adjust it with the screw. It still flails. until it dies

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Hello! Carver lawn mower bought 2 years ago, used it a year, 3-4 times 1-1.5 hours with interruptions. At first it worked fine. But last year, it stopped starting. Everything revised, rebuilt, the spark is normal, but the plug is immediately wet, through the air filter leaks fuel. Next, all done as in the video and the needle runs smoothly without resistance, but the problem is not solved. The engine does not start, but if you unscrew the mounting bolts and move the carburetor to 46 mm to pass through the air, it starts, picks up speed and starts to stall when poddodiluyu carburetor. Receiving a batch of fuel the engine is unstable, but runs. When I attach the carburetor also does not start.

Help, please. Grasshopper starts and runs as soon as you give the gas. It rumbles and stops. And it starts to vibrate a lot

Hello, please tell me your trimmer in the repair of me to change the oil seals repaired and repaired the carburettor karochi now she starts and runs at idle for a minute and a half and then shuts down, then you start and work. sometimes it starts up and shoots into the muffler. I took the spark plug out and cleaned it. And if you shut it off for example to refuel the gasoline, it starts and then you put gas it stops and then somehow restart it runs and does not understand what happened to her without going anywhere.

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similar problem. started it for a long time. with no result. took out the plug cleaned. All covered with soot. started. Worked for about three minutes and then stalled. unscrewed the spark plug again it is wet?) and now won’t start. almost started once but then nothing again. What to look for? changed carburetor already last year

Hello. I watched your video and only positive impression. Few words, more things to do))))) I have a question for you. I have a lawn mower, or she me)))), Expert 430. I keep having the same problem. After a certain amount of time, always different, rpm rises to maximum and stalls.If you hear in time that the speed increases and a couple of times fist on the air filter, the work is normalized. If you “yawn” with this process, it is practically impossible to start. A carburetor pump pumps air and that’s it. I have to clamp the return tube with pliers and pump until the pump bulb does not get gasoline. What have you been doing? Replacement gaskets and diaphragm primer (twice) in the carburetor, replacement of the valve and needle, respectively, flushing and purging, purging your way)))) Adjustment, as the book says and folk methods, the result is zero. I have been racking my brains for more than a month, no effect ((((( Maybe you can give me a hint?

Please advise, gasoline trimmer Husgvarna 235R? Runs great, mowing 1-1,5 hundred square meters and starts “meek” as if not enough fuel, and only when you give “gas”, will lie 15 minutes and then starts perfectly again! and again 1-1,5 hundredths and again “poor”. Crankshaft packing, piston ring, spark plug filter was replaced two months ago, grasshopper worked for 50 hours, what is the problem?

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Hello! In general, I continue to fight with her. Before start could not pump gasoline pump for a long time. Spit it out, put it away. Took off the air filter, rinsed it, put it on dry. Dry out, put it back in. Started pumping. There were a lot of air bubbles in the return hose but pumped. Started after the third time. Warmed up a little and went to work.Worked for an hour and a half. Stalled twice. Without increasing the speed. When unscrewing the lid of the fuel.No hiss in the tank. Fuel pumping is a big problem. Is blowing air in the return and the edge of the. RPMs are “floating” in the downward direction. I rebooted the engine, it stabilizes.In short. It makes me very angry.

Hello. Problem with the chainsaw. Will not start. After a long delay, barely started, ran for 5 minutes and stalled and does not want to start again. Filter is normal, the spark is, the fuel comes (cleaned the carburetor), but do not want to start. Doesn’t even lift off when priming with fuel from the nozzle. What do you think might be the problem??

Guys, I owe the bike for looking for and finding the problem.Some craftsmen (let’s not name it) immediately run to get a new carb, even for a new tool.

Hello! I have a question.I have a lawn mower Soyuz BTS-9252L and uses a lot of gasoline! What to do and whether it is possible to reduce the consumption of gasoline?

Lawn trimmer does not start after winter

How to be in this situation? No need to worry and panic. This is a very common problem, which can be solved in about 3-4 minutes. Firstly, if you have left the previous year’s fuel in the tank, it must be drained. Gasoline loses its octave properties already after 2 weeks of downtime. Secondly, you need a slightly different way to start the mower after a long standstill. First you need to open the choke and pump some fuel mixture into the carburetor, then pull the handle until you feel a little resistance. Grass trimmer can be started afterwards.

If your weed trimmer starts but immediately stops when you try to start it, the air filter could be the culprit again. You need to remove it and check whether it is not clogged with dust. If it is really so, you need to clean it thoroughly or you can buy a new one. The problem can also be a faulty ignition coil. In this case it is better to bring the lawn mower to the service center.

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Also in the electrical equipment can be punctured ignition coil. In this case, the lawn mower does not start or starts and runs intermittently, and then shuts down, or on a “hot” does not start at all.

To check if the coil is working properly, you can do it the same way you check the spark: unscrew the spark plug, lean it against the body of the grass trimmer. If there is no spark when the starter jerk, or it appears intermittently. you need to change the coil.

How to Start Diagnosing a Grasshopper?

If the lawnmower does not start or immediately stops after starting, you must consistently check all major components and units. The check algorithm is as follows:

  • Fuel tank (fuel quality);
  • The spark plug and the spark plug duct;
  • Air filter;
  • Fuel filter;
  • The breather;
  • Exhaust duct.

These subassemblies are most often the source of major problems, which can be corrected after a thorough inspection.

Checking the fuel mixture

Before starting the engine of a gasoline grasshopper, check the presence and quality of the fuel mixture. Don’t be thrifty, greedy or “smart” about it. Repairing or replacing the piston group will cost you too much (sometimes up to 70% of the cost of a new tool). Prepare the oil-fuel mixture must be strictly according to the instructions. Calculate its quantity from real needs. Excessive petrol that remains after work loses its qualities with time.

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Carry out diagnostics of the spark plug and the spark plug duct

If the quality of the fuel mixture is not in doubt, but the lawnmower stalls at startup, the cause may be a primed plug. An ordinary spark plug wrench (every motorist should have one) and a spare spark plug are helpful for the repair.

  • Unscrew the spark plug and wipe it clean;
  • Dry it thoroughly (don’t burn it);
  • Excess fuel in the chamber is drained through the spark plug hole and dry it;
  • Clean the old candle from the soot with a nail file or a lady’s file;
  • We expose a gap with a distance of 1 mm (it is possible to check it with any coin);
  • Put everything back in place and try to start the grass trimmer.

Dry the channel no less than 30-40 minutes. Otherwise there is a risk of re-fueling and a new spark plug.

If the spark plug is working, the socket where it is located is completely dry, and the lawnmower does not want to start, lubricate the thread connection with gasoline. It should be slightly moistened. No matter how good the spark is, there is nothing to ignite in the dry chamber.

If the grass trimmer engine still does not start, you should rule out such a cause as a lack of spark due to poor contact between the spark plugs and the high-voltage wire. If the connection is good, but the spark is still not there, most likely you have a “broken” ignition unit. You can’t do without a handyman here. ะบ. the part is not repairable, but is sold as a complete unit.

Lawn mower filter diagnostics

Another reason why the gasoline grass mower stalls can be the air filter. To rule it out, try removing the filter and starting the grass trimmer without it. If it succeeds, then it is necessary to change the air filter for a new one, or at least blow out and thoroughly clean the old one.

The gasoline grass trimmer may not start due to contamination of the fuel filter. This is the next step of 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 intake without a filter at all, this is prohibited by any instruction manual. Haste may result in the repair of the engine piston group.

Breather and exhaust port

Often, “delicate” brand name models of chain saws will not start and shut down due to a contaminated breather. The main function of this element is to equalize the pressure in the gas tank. If this unit is clogged, a vacuum is created in the tank, preventing fuel flow. You can solve the problem by cleaning the breather. You can use an ordinary needle for cleaning.

Normal operation of a combustion engine can be impaired by dirt in the exhaust port or a clogged muffler screen. There is such a problem on older generation models. You can solve the problem by the traditional cleaning and removal of anti-sparking grid.

Why the grass trimmer does not start there is a spark

Sometimes the trimmer or lawnmower does not start at the most inopportune moment, disrupting the scheduled work on a country house or country site. Before calling a service shop, you can sometimes try to solve the cause of the problem yourself.Let’s take the Husqvarna 128 R grass trimmer as an example. So, you’ve done everything according to the instructions. the primer (see “How to use lawn trimmer”). Figure 1) pump fuel in carburetor, put choke lever in “close” position, try to start but engine does not even “take off. Throttle (air) damper lever setting (see “Start/stop” on page 13). Figure 2) in the “Open” position do not give results. Lawn trimmer won’t start.

Figure 2-Mower arrangement : throttle (air) damper, manual starter

Over priming the engine with primer is a very common cause and causes the spark plug to “gunk up”. If this happens, try the following procedure: move the throttle lever to the “open” position, pull and hold the throttle trigger while trying to start the weed trimmer. If you can’t get the weed trimmer started after 5 to 6 attempts, unscrew the spark plug and dry it. Check the spark plug for spark between the electrodes. to do this, place the spark plug cover on the spark plug, hold the spark plug housing against the metal surface of the cylinder and crank the engine with the starter motor. If there is no spark between the electrodes. replace the spark plug. Before you wrap the spark plug, turn the Grass Trimmer upside down and crank the engine 2-3 times to remove any fuel residue from the cylinder. Reinstall the spark plug and repeat the steps described at the beginning of this paragraph.If after the made manipulations the grass trimmer does not start, then most likely the cause of the malfunction is more serious and you need to contact the specialists of the service shop. Read more here.

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