The main thing is to use any garden equipment(and equipment in general) is compliance with all operational requirements, as well as timely Maintenance. Only under such conditions gasoline lawn mower will work properly and for a long time. However, unforeseen situations still happen, and one “fine” day the device may stop starting. Today we will find out why this happens and how you can fix this kind of problem.

Common breakdowns and how to fix them yourself

If the lawn mower does not want to start, then first of all, check if it has gasoline. If there is none, add to the required level. The fact is that if the device is inactive for a long time, the gasoline seems to “exhale” from it, therefore, it needs to be drained and replaced with a new one. Do this carefully so that fuel does not get on the engine (otherwise it may catch fire).

Note! If you do not know which gasoline should be used specifically for your lawn mower model, find the relevant information in the technical data sheet.

By the way, if you are just planning to buy a gasoline lawn mower or any other garden equipment, we recommend visiting the website gardenmoto.ru. There you will find the widest range the products are quite reasonable prices. But let’s return to the reluctance of the device to start.

So, the next reason why there may be similar problem, lies in the incorrect position of the air damper during the first start. Based on the air temperature, this damper either closes completely or moves to the middle position (if the temperature is 30 degrees). After this, it should be opened entirely.

We also recommend checking out air filter to find out if it is dirty. To do this, turn on the lawn mower and disconnect the cable from the spark plug. Remove the cover, remove the filter, wash it with gasoline and dry it thoroughly (or, alternatively, install a new one).

Note! The air filter should be replaced on average every 25 hours of use of the device. Remember this!

Finally, the last reason is faulty spark plug(by the way, it might just be filled with gasoline). To find out, unscrew it, clean it and check for a spark. Next, close the choke and try to start the engine. If this does not give any result, it is better to trust an experienced professional.

Video - Lawnmower won't start

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If there is no spark, you need to replace the spark plug, and if the spark is weak and unstable, then it is better to clean it with fine sandpaper or a file. But, in 90% of cases, the cause of problems with the lawn mower lies elsewhere. Most often, problems arise due to a clogged carburetor, and later in this article we will tell you how to clean it yourself.

Cleaning the carburetor of a lawn mower engine

We will demonstrate the process of cleaning a carburetor using the example of a gasoline Craftsman lawn mowers with Briggs&Stratton engine. Most lawn mowers and their engines are very similar to each other, so this material will be applicable in most cases. So let's get to work!

Attention! Gasoline leaks may occur during operation. You cannot work indoors. Before starting work, make sure that there is no nearby open sources fire. Don't smoke while working!

First of all, use a flathead screwdriver to remove the air filter housing from the engine. After unscrewing the screws, remove the plastic casing and take out the air filter. Pay attention to how dirty it is. Bad condition filter may also be the cause unstable work engine, so if necessary, replace the filter or at least clean it with a vacuum cleaner.

If, at the first start, your new lawn mower refuses to start, try the following: based on the outside air temperature, set the appropriate air damper position (at a temperature of less than 30 C - “choke closed”, above 30 C - half-closed position), then pump it into the carburetor fuel and gently but rather sharply pull the starter handle until you feel some resistance. Repeat these steps in the same sequence several times. A completely new tool should start. If this finally happens, you can safely get to work by first opening the damper completely.

If the lawn mower is no longer new, then you need to start inspecting it from the gas tank. If the device has not been used for a long time, then it is necessary to drain old gasoline, which has the feature of “fizzle out”, i.e. lose its octane properties, and fill in with fresh fuel mixture. The gasoline/fuel ratio, as well as the required grades, are usually indicated in the operating instructions for the tool.

Now you need to check the spark plug - either the problem is in it itself, or in fuel system. The spark plug must be carefully unscrewed and its condition assessed. If the candle is heavily flooded or has black carbon deposits on it, then it must be removed, cleaned and dried. Drain excess fuel, if any, from the spark plug holes, dry the cylinder itself, then screw in a dried or, even better, completely new spark plug. If the spark plug was initially completely dry, you need to look for a problem in the fuel supply system. First check fuel filter. To do this, disconnect the suction hose and remove the dirty filter from it, clean it and reinstall it, or replace it with a new one. If this does not help, you should contact a specialist service center.

Won't start after winter

In this case, you just need to drain the old and possibly even frozen fuel and fill in the freshly prepared mixture. Then you need to perform the same manipulations as when you first started the lawn mower.

Starts and stalls

If the lawn mower stalls after starting, you need to check the air filter. When this filter is heavily clogged with dust, it stops passing into the carburetor. required amount air and allows dust to enter the fuel mixture. It is necessary to carefully remove the dirty filter, clean it and rinse it in gasoline. If the air filter is clean, but the tool still stalls, then it is better to contact a professional to determine the cause of the malfunction and eliminate it.

Ymka 17-06-2018 16:46

There are two lawn mowers at the dacha. The first castle garden (Italian, I think). The second honda hrx 476. Honda has become weird lately. When cold it starts the first or second time. After it runs for 10-15 minutes and stalls or turns off, then you won’t start it for 10-15 minutes. I couldn't find any adjustments. I tried to open the lid of the gas tank, it seems like they write on the internet that the gas may not flow well. Nothing helped.
Castle Garden operates without interruption at all. Even though it’s already torn apart.

BIJO 17-06-2018 19:03

This is a feature of OHC engines with overhead camshaft

V.G.life 17-06-2018 19:24

I have a similar two-stroke leaf blower engine. I started it, revved it up, chasing the mown grass off the sidewalk, after 15 minutes I turned it off, and the hell it started. The next morning it starts. But when the engine is running, there is some instability, especially at idle. Probably a carburetor? Opening the gas cap does nothing.

DIZZI 17-06-2018 20:12

1 overheat
2 rich mixture
3 ...

TSV 17-06-2018 20:42

quote: Originally posted by V.G.life:
with two-stroke engine
I started it, revved it up, chasing the mown grass off the sidewalk, after 15 minutes I turned it off, and the hell it started.

There may be excess oil in the fuel. the rings went down

SergeyK76 17-06-2018 21:38

first try changing the spark plug, second the brain may rosin the module

Ymka 17-06-2018 22:00

quote: Originally posted by SergeyK76:
first try changing the spark plug, second the brain may rosin the module

I'm already home now. In general, how much does a candle usually cost? You can unscrew the heads or spark plug wrench buy? Was somewhere from the fourteenth vase.

1 overheat
2 rich mixture
3 ...

It works for 10-15 minutes, then it starts to brainstorm. It seems to me not enough for work.

The revs work normally, with no complaints at all regarding the engine's performance.
The lawnmower is 2 years old.

Last summer I changed the oil. I looked at the condition of the knife. Seems to be OK. But it seems to be spreading the grass rather than throwing it into a bunker. The zdavizhka is worth sending to the bunker.

quote: Originally posted by BIJO:
I also have a Honda, only a UMK435T, a 4-stroke mower. And I was also weird for a while.
Until I understood a simple thing. There is an oil sensor there, and it turns off the engine if, as it seems to him, there is not enough oil. Then the engine sits, the oil drains and runs again. So fill up the oil maximum level and everything will work OK.
This is a feature of OHC engines with overhead camshaft

OK. THX. I'll try.
I looked at the oil and it was somewhere in the middle on the dipstick. But this is already muted just now.

TSV 17-06-2018 22:06

quote: Originally posted by Ymka:
I won’t get into the module, but I also thought about looking at the spark plug. There was no spark plug key at hand.
I'm already home now. In general, how much does a candle usually cost? Can you unscrew the sockets or buy a spark plug wrench?

you can’t get into the module. they are usually flooded
You can unscrew it with a key or a socket
If possible, work to warm up. then, when it does not start, unscrew the spark plug, attach it to the block and start it. will there be a spark at the spark plug or not?
if so, then the problem is not in the module

DIZZI 17-06-2018 22:07

How to reduce rich mixture? I couldn't find any adjustments.

https://www.honda.co.ru/Projec..._476_VKE_RU.pdf

They write to contact professionals

3rd air filter contamination (may cause rich mixture)

Ymka 18-06-2018 12:32

quote: Originally posted by DIZZI:

3rd air filter contamination (may cause rich mixture)

I looked at the filter. Clean as a baby's bottom.

I will try.

p-f 18-06-2018 01:25

quote: How to reduce a rich mixture? I couldn't find any adjustments.

wash the air filter and\or replace\wash the carb gasket
convinced in stock o-rings on the intake manifold

Gruch 18-06-2018 10:41

I had a similar effect on my chainsaw. After making sure that the problem was not in the carb or filters, we changed the ignition coil. Somehow it got stuck when it was hot and they didn’t bother to figure it out.

SergeyK76 18-06-2018 10:53

quote: Originally posted by Gruch:

changed the ignition coil

scientifically it is called a module

TSV 18-06-2018 11:23

Another question is whether the module is at fault?
That's why you need to check the hot one. unscrew the spark plug and quickly check for spark

SergeyK76 18-06-2018 12:28

Another question is whether the module is at fault?

absolutely right

TSV 18-06-2018 12:41

wire with neon

no one looked at what was done there?

SergeyK76 18-06-2018 12:48

quote: Originally posted by TSV:
repairmen have an ignition tester
wire with neon
is placed in a circuit break and by the glow of the neon you can see how strong the spark is.
one-time jerks are expressed in the form of individual sparks. When the car is running, it lights up with a bright, constant flame.
neonka (with a resistor) is just in parallel with the wire?
no one looked at what was done there?

what kind of nonsense they told you, I can send you a photo of this stray, it is used to immediately eliminate a defect in the module, and that’s what I’ve never done, I haven’t run the unit on it, so I can’t say about the glow

TSV 18-06-2018 12:58

why did they say that?

but how it flickered on a working ignition and on a faulty one - the difference is immediately visible visually

SergeyK76 18-06-2018 13:21

quote: Originally posted by TSV:
why did they say that?
I saw this cable at the Shtiley repairman. and ran it on it with a working module and with something that was in question
the cable is flooded, so you can’t see what and how it’s connected
but how it flickered on a working ignition and on a faulty one - the difference is immediately visible visually

That's right, I have the same one, but somehow I've never run it on it

TSV 18-06-2018 13:33

in the photos there is a 62MΩ resistor

SergeyK76 18-06-2018 13:44

quote: Originally posted by TSV:
Can you look into the hole, how was it soldered there?
in the photos there is a 62MΩ resistor

I looked, there are no markings, there is a cone and there is wiring

TSV 18-06-2018 13:47

how did you connect it?
Can I call something?
Do the wires go directly from the ends to the connector? Or did they make an induction coil out of wires?

SergeyK76 18-06-2018 14:15

quote: Originally posted by TSV:
the resistor is painted with stripes. I looked up the denomination from the photo on the internet
how did you connect it?
Can I call something?
Do the wires go directly from the ends to the connector? Or did they make an induction coil out of wires?

This is probably a question for the manufacturer of this gadget, they don’t give us this information because it seems to have no use for us

TSV 18-06-2018 14:29

If you have time and desire, please ring the ends of the wire for neon and rezuk
there may be 2 options - the wires are soldered, and the wires are wound onto the main one (inductive pickup)

Apiary 18-06-2018 19:40

I’ll throw in my 5 kopecks - on a car there was a similar glitch on the ignition coil - the low wire in the compound broke off, and there was a similar effect - when cold the engine worked fine, when it warmed up it started to stall. When it cooled down it started as if nothing had happened. Just ring the heated coil and understand.

TSV 18-06-2018 20:10

now semiconductor modules
so there is no use calling them.
unless there is one nearby that is exactly the same to compare
and it’s not an option that they will be the same. parameters may be different. and the module will be working

Ymka 19-06-2018 08:52

quote: Originally posted by TSV:
Another question is whether the module is at fault?
That's why you need to check the hot one. unscrew the spark plug and quickly check for spark

More details.
Did you warm up the mower, turn it off, take out the spark plug and pull the starter?

skycat 19-06-2018 13:08

quote: Originally posted by Ymka:

took out the candle

After this, you need to place the spark plug on the engine body so that there is contact between the body and the spark plug itself. You can secure it with wire so that it doesn’t fall off when you pull the starter.

p-f 19-06-2018 13:22

quote: Did you warm up the mower, turn it off, take out the spark plug and pull the starter?

just look at the candle. if the insulator of the central electrode is white and without carbon deposits, then everything is in order. You won’t really see the spark, because it’s dead there.
Last year I posted a photo in a similar topic - the engine began to malfunction due to a crack in the intake manifold.

SergeyK76 19-06-2018 13:28

z for cracks in the intake manifold.

in theory it shouldn't have started at all best case scenario sneeze

p-f 19-06-2018 13:53

it started and worked, but as if it was late. First I installed another coil from an old mower, then a gasket for the carb. and only then I found a crack. I managed to seal it with superglue and Kevlar

SergeyK76 19-06-2018 14:13

quote: Originally posted by pf:

although it's written down. it didn't start

this is how it should be, and even if it was glued together, it still shouldn’t have worked for long, it should have fallen off, there should have been this vision somewhere where the mower is standing

p-f 19-06-2018 17:42

works well. about a liter per 10 acres on a self-propelled vehicle.
It’s not a problem to do crap with lumina.

Sterm 24-06-2018 08:59

If there is a metal casing on the tip of the spark plug wire, try throwing it out, it helped me. It also had trouble starting when warm.

Ymka 24-08-2018 13:11

The conclusion is something like this, in my limited experience - the gasoline that was poured into the lawn mower was purchased two months before problems arose. I bought new gasoline and the problem went away.
I specifically turned it off and started it several times. It worked, then turned it off and started it again. Everything is working.
Either octane number dropped, or something else happens to gasoline after some time.
By the way, my mother-in-law’s canister was leaking, so I put it in and told them not to carry it in it anymore, and not to buy too much in reserve. I highlighted mine.

Despite quite wide choose lawn mowers with different operating principles, gasoline mowers do not lose their popularity. They have earned respect among users for their power and autonomy.

For a comfortable work process and the absence of breakdowns during operation of a lawn mower, as well as other garden equipment of a similar function: trimmers, walk-behind mowers, the first start is very important. If you do not pay enough attention to preparing equipment for use, this may affect the quality of work or lead to damage to the unit.

Starting the lawn mower

Before starting a gasoline lawn mower, you should visual inspection for visible damage. The process of starting the unit is conventionally divided into several stages.

Preparing the fuel mixture, refueling

If the lawnmower is started after winter, the contents of the tank are checked: if there is unused fuel, it should be drained. Then you can start refueling the equipment. It is important to know some nuances here.

For refueling two-stroke engines it is necessary to use a fuel mixture. You can purchase it ready-made or prepare it yourself. There is nothing complicated in preparing the mixture, but you need to adhere to the required proportions.

Petrol lawn mower Oleo-Mas

When using synthetic oils, a proportion of 1:50 is used - for 5 liters of gasoline 100 g of oil.

Using mineral oils the proportion is 1:35 - 100 g of oil per 3.5 liters of gasoline.

Refueling four stroke engine does not require preparation of the fuel mixture. There is a special sump for oil; gasoline is poured separately. It is important to remember that the oil also requires changing, depending on the intensity of use of the lawn mower. Basically, you need to change the oil every 50 hours or at least once a year.

Important! Lawn mowers perform well when using oil with a viscosity index of SAE-30. In addition, if the engine break-in was carried out at synthetic oil, in the future it cannot be replaced with a mineral one and vice versa.

As for gasoline, lawn mowers made in China, Japan and America work well on A-92 fuel; for European models it is better to use gasoline with a high octane number.

When refueling the mower, you need to ensure that the gasoline level is 2-3 cm below the edge of the fuel tank.

Starting a cold engine

Before starting a cold lawn mower, the transmission and ignition system are turned off, and the motor shaft is cranked with a starter or starting cord.

If the lawn mower does not start, you will have to carry out a number of other manipulations:

The throttle remains closed, the ignition is on;
Button pressed fuel pump(suction) about 5 times;
An attempt is made to start the engine.

In case of repeated failure, you should:

open the damper to prevent the spark plugs from flooding;
turn the shaft with the starter;
blow out the combustion chamber;
start the engine.

Sometimes it may take about 15 jerks to start the engine for the first time - this is quite normal for this technique.

When the engine starts, squeeze the throttle lever once to use idle speed. Next, the lever is installed in the position corresponding low revs. In this position, the engine must run for about 5 minutes to warm up. If necessary, its operation can be stopped by pressing the “Stop” button.

Starting a warm engine

Starting a preheated engine is much easier and does not require such effort:

the control knob is set to the “maximum fuel supply” position;
the engine starts;
the desired speed is selected.

You can start working.

Errors at startup

The most common mistakes when starting a gasoline lawn mower are:

Major breakdowns of lawn mowers

Despite big choice manufacturers and variety of models, the reasons why a Makita, Honda, Husqvarna or other lawn mower does not start are the same for everyone.

The main reasons why a gasoline lawn mower does not start or starts but immediately stalls may be problems with the ignition, carburetor, or filters.

If the fuel is filled and fuel mixture high quality and in the right amount, air damper closed, The lawn mower starts and immediately stalls; the reason may lie in the following problems:

Faulty or flooded spark plug. In this case, you should unscrew the candle, dry it well and thoroughly clean it with a nail file or file. Excess fuel is drained and dried spark plug hole. A gap of 1 mm is set, and the spark plug is screwed in again.

Important! It takes at least half an hour to dry the canal.

Dry threaded connection. It should be lubricated with gasoline so that the spark can ignite.
No spark from the spark plug. In this situation, first check the contact of the spark plug and high voltage wire. If the contact is normal, but the lawn mower makes a popping sound and stalls, there is a problem with the ignition, and you cannot do without a service center.

These breakdowns are common reasons, why the Husqvarna lawnmower does not start.

Quite common causes of breakdowns of garden equipment, including why a Honda lawn mower won’t start, are problems with the air and fuel filter:

Clogged air filter. If the first possible reasons have not been confirmed, but the lawn mower still stalls, you can remove the air filter and try to start the machine without it. If a stalled engine starts, this is the cause. The filter should be cleaned or replaced with a new one.
Dirty fuel filter. Another possible variant diagnostics The filter element is inspected and replaced if necessary.

Important! It is highly not recommended to operate a lawn mower without a filter element.

Breather contamination. It helps regulate the pressure in the gas tank. If the breather is blocked, a vacuum is created and the fuel supply stops.

The following breakdowns are more serious and will not be easy to deal with without certain skills. Problems with carburetor problems include:

Contamination of jets and channels. Washed special liquids, are blown with a stream of air from the carburetor.
Worn gasket. It is being replaced with a new gasket.
Damage to seal. Diagnosis is carried out using a tonometer. If the pressure is stable, everything is fine, if it drops, you need to find and replace the damaged element.

Another possible breakdown is a malfunction piston group. Worn or damaged pistons should be replaced.

Petrol lawn mower Vityaz BG-4900

Rules for operating a gasoline lawn mower

Like any equipment, a mower requires some special care and compliance with the basic principles of use. These rules are simple, but will help maintain the functionality of the unit for a long time.

General operating rules:

Read the instructions for using and caring for the lawn mower, learn the basic rules of operation, storage and safety precautions.
After each use, clean the body, channels, grass catcher, knives, preferably using special liquids.
Do not clean the lawn mower with a hot engine.
During operation, monitor the condition of the engine, do not let it overheat, and take breaks.
For long intervals in operating the lawnmower (about a month), drain the fuel. In this case, when the work is completed, the device is given the opportunity to work on Idling and stall.

Rules for preparing equipment for winter:

Safety regulations:

Before starting work, the work area is checked for the presence of foreign objects: stones, branches.
No strangers are allowed within a minimum distance of 5 m from the lawn mower.
The work is carried out in special glasses.
A visual inspection of the lawn mower is carried out for damage and loose parts. Malfunctions are eliminated.
You can mow grass no higher than 20 cm, no more than a third of it at a time.
When working on slopes, you should move along the slope, not up and down.
The motor stops before changing the bevel height.
If foreign elements get into the mower blade, the work stops and the blade is cleaned.

Gasoline lawn mowers have earned the respect of users for their power and quality of work. In order to extend the durability and performance of the unit, you need to learn all the intricacies of care and maintenance of the lawn mower, follow safety rules, and adhere to the operating instructions for this equipment.