The instrument, despite its small dimensions, represents a complex technical device. If you study the instruction manual, it turns out that there are reasons why it won’t start. lawn mower, are known and removable. It is necessary to eliminate one by one the reasons that make it difficult to start the tool. Usually they start with more accessible nodes with easy testing of serviceability.
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Our client still has reasons why it won’t start lawn mower, of course, systematize according to the specifics of the operation of individual nodes. In the service, faults are systematized:
The user first needs to check whether there is fuel in the tank. Start up in accordance with the instructions, placing the saw on its side. Set the air damper to the “closed” position, pump up the fuel, turn on the ignition and make 3-4 sharp jerks with the starter. If the engine starts, open the air damper. Does not start lawn mower– repeat the operations with the air damper slightly open.
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The motokosa is not capable of working for a long time. The gearbox and engine will overheat. There is an option to mow for less than 15=20 minutes, taking a five-minute break. On a hot afternoon work time is reduced by half. When mowing weeds and sedges, the working time must be reduced.
If the launch fails, we begin to find the cause of the failure:
More complex causes will be those detected during diagnostics of a malfunction, leading to serious carburetor repairs. Such reasons include clogging of the internal channels of the carburetor, wear of the gasket and a violation of the density of the internal halls with loss of vacuum. Repairing a lawn mower at home if it won't start will require patience.
The fuel mixture is prepared with strict adherence to the proportions of gasoline and oil. However, you cannot use another brand of fuel. To prevent dirt from getting in, gasoline should sit in a glass or iron container for 4.5 days. Cannot be used to store fuel plastic dishes. Accurately measure out the honey using a syringe without a needle. Use only freshly prepared mixture, without leaving unused fuel in the tank. If the engine is finicky, the lawn mower stalls, when you press the gas, the fuel is at fault.
Petrol mower It won’t start when it’s hot - press the gas trigger and sharply pull the cord a couple of times until the engine starts, then lower the trigger. It won't start - it requires special repairs.
Checking the accounting software (software) of the ignition, if it does not start, is carried out one by one:
Specifically, if the passage of the ignition coil is faulty lawn mower Doesn't start when hot, stalls, runs intermittently.
Cleaning, or changing the air and fuel filters, will ensure the required flow of ingredients entering the carburetor. There is an option to wash the air filter in soapy water or change it. If nylon fabric is used, it is washed and the porous felt filler is replaced. The fuel filter is changed carefully, without leaving the intake pipe open. Whether the air filter needs to be changed is determined if the engine starts with the air cleaner removed. Is it necessary to change the fuel supply grid if it won’t start? lawn mower, a dry candle will give a hint.
Breather, a hole for admitting air into the gas tank. If it becomes clogged, a vacuum is created in the tank and the mixture does not enter the carburetor. Of course, blow out the hole with air or clean it with a needle. Clean the exhaust channel and remove the muffler anti-spark mesh.
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High and low engine speeds and smooth idle speed are controlled by the carburetor. The stable operation of the lawn mower depends on the amount of flammable mixture and air supplied and their ratio. Petrol mower It will not start if the carburetor adjustment is incorrect. The order of the device options for supplying fuel at low speeds (L), high speeds (H) and idle speed (T) is regulated by the screws of the same name:
After adjustment, a working ignition with cleaned filters and a tested ignition should ensure engine operation. If there is a carburetor malfunction, after it has been repaired, you will again need to set up the feed to allow accounting (software) before starting the lawn mower.
The rarest breakdowns that prevent the operation of a lawn mower are:
The most important malfunction that requires elimination is related to changing the motor and possibly breakdown piston group motor. The repair price will cost approximately 70% of the price of the product. Find out the reasons why it won't start lawn mower, this video will help:
There are no unnecessary phrases in the instruction manual; everything that is offered is aimed at trouble-free operation of the lawn mower. Cleaning all parts after each work cycle facilitates easy removal of unhardened residues and dirt. Only cooled components need to be cleaned. This technique promotes the quality of air cooling of the motor and gearbox.
Adjustment lawn mower carburetor you can do it yourself
Petrol mowers, like all petrol-powered garden tools, are not difficult to maintain equipment. It is possible and necessary to repair and configure without the help of others. For example, adjusting the carburetor of a lawn mower with your own hands– it’s a matter of 5 minutes.
The carburetor from a lawn mower is a component in the power system. Carburetor adjustment That's it for Husqvarna adjustment. Well, there will be a trimmer. In it, like all carburetors, the process of mixing air and fuel (gasoline) takes place for subsequent supply to the engine cylinders.
In this process, the main thing is the correct proportion of fuel and air, which is why the carburetor is adjusted.
Mesh filter. There are usually only two difficulties with this element:
In order to find out the cause of the breakdown, unscrew the fuel filter cap to remove the strainer. If dirt has simply accumulated on it, then washing it in gasoline or blowing it out will help.
If there is visible damage to the mesh filter, it is imperative to install a new one. There may also be damage to the fuel supply pipe (during repairs, it is practiced to check this element).
In most cases, the carburetor starter does not work due to blockages. You should use acetone or the same gasoline for washing.
Blowing clogged carburetor parts compressed air– acceptable and comfortable repair practice.
The throttle body, joints of carburetor parts, intake or exhaust pipes - all of these parts are subject to depressurization. You can probably check simple method– Spread the problem area with soap foam.
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The base of the lawnmower carburetor is a duralumin body. It contains a diffuser (a hole with internal contours). Air is forced through this hole. The oxygen (air) supply rate depends on the cross-section (pass hole) of the diffuser.
The diffuser is equipped with fuel channels. Fuel is drawn from them using an air flow.
Install externally on the carburetor:
The throttle valve determines the amount of air supplied, and the engine power directly depends on this.
How to adjust carburetor brush cutters Husqvarna 125, 128 (without tachometer) Part number: 5450818-48.
How to adjust carburetor, if you need to work, but a service with a tachometer is too far away.
Fuel is sucked into the carburetor system by a pump (its membrane). Then it passes through the fitting in the carburetor. The liquid then moves through the inlet and outlet valves of the pump. Filtered with a mesh. It moves through the needle valve into the membrane chamber.
Step-by-step operation of the device:
The level of air density in the system depends on the area of the open air damper. The wider the damper is open, the greater the fuel consumption and power.
Simply put, adjustment carburetor on a lawn mower - creating a good fuel consistency due to correct air supply.
Before adjustment, you need to carefully clean the filters according to the technical maintenance instructions.
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Upcoming setup do-it-yourself lawn mower carburetor made with adjusting screws. There are three in total:
Right (L)– adjusting the fuel consistency for low speeds.
It is necessary to find the highest idle speed. To do this, slowly unscrew the screw (L) to the right and to the left.
To adjust, turn the screw a quarter turn, always counterclockwise.
Lower (T)– is responsible for adjusting the engine at idle.
For correct adjustment specifically idle speed is typical:
Left (H)– consistency adjustment at high speeds. (The screw is adjusted last).
The overall adjustment of maximum speed, engine power, temperature and gasoline consumption depends on the left screw (H).
Setting up the carburetor of the lawn mower with the last screw is done as follows:
It’s interesting that based on the creator’s beliefs video, the setting (its correctness) is determined by the color of the spark plug, and not just by the speed and stability of the engine.
Faithful carburetor adjustment with your own hands in this case - combustion of the fuel mixture without residue, the color of the candle should be light brown.
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Trimmer. How to properly start a cold trimmer engine Created by: Vasilii Ivanovih Posted: Feb 11 2016 Views: 56,692 Likes: 146 Dislikes: 268 Trimmer. How to properly start a cool trimmer engine. Our client is left with the subtleties and tricks of starting a cool trimmer. The trimmer starts up great if you...
Increased fuel consumption and rapid formation of carbon deposits on the trimmer spark plug when using a properly prepared fuel mixture indicate the need to adjust the carburetor. This describes the adjustment of trimmers with carburetors that have one screw for adjusting the fuel supply.
Before adjusting the carburetor, wash the air filter. It is recommended to wash it after every 10 hours of operation. After this you can start making adjustments. The example photo shows the carburetor of the PRORAB-8406 petrol trimmer. The numbers indicate the adjusting screws that we will use.
Carburetor adjustment screws for petrol trimmer PRORAB-8406
Purpose of adjusting screws:
Start the lawn mower and wait until it warms up.
Start slowly turning the fuel mixture adjustment screw until the engine starts to stall, or until it stalls if you don’t have time to catch the moment. After this, unscrew the screw a quarter turn if the engine does not stall, or half a turn if it does stall. Start the stalled engine. Check by opening the throttle to see how the engine picks up speed. Continue unscrewing screw No. 1 a quarter turn until the engine, when accelerating, begins to confidently gain increased speed. This will be the moment of the most economical stable operation of the engine. For the petrol trimmer PRORAB-8406, the adjusting screws are turned clockwise and unscrewed counterclockwise; for some other brands of gas trimmers it may be the other way around.
Let's start adjusting low speeds. Screw No. 2 limits the return movement of the throttle lever - by turning it, we increase the idle speed, and by unscrewing it, we decrease it. Adjust so that the engine runs confidently at low speeds and even a little faster (for better starting), but so that the reel with fishing line or the knife does not rotate, and there is a sufficient reserve of revolutions before they begin to rotate. If the engine has difficulty starting, increase the idle speed further.
After adjusting the fuel mixture supply and low speed, check how the lawnmower engine will operate at maximum speed. If necessary, limit the maximum speed to the required level using the #3 hollow screw. Loosen the locking nut and screw in the screw to decrease the maximum speed, or turn it out to increase. After adjustment, tighten the nut. Setting the maximum speed is necessary to protect the trimmer motor from overheating and the ability to use the start key lock to reduce fatigue of the right hand.
In the future, it may be necessary to adjust the trimmer carburetor. For example, if the engine starts to rev poorly when running at full load, unscrew screw No. 1 another quarter turn. If starting is difficult, increase the idle speed. The operation of lawn mowers can also be affected by weather, and the quality of the fuel mixture. Vibration can cause the adjusting screws themselves to turn.
My first attempt to adjust the carburetor of the lawn mower did not yield anything, since the spring of the fuel mixture adjustment screw was in the way. The factory spring turned out to be too thick when compressed and did not make it possible to reduce the fuel supply to the required level. I had to pick up another spring and continue the adjustment after replacing it.
Fuel mixture supply adjusting screw with spring In the photo above there is a factory spring, below there is an adjusting screw with a selected spring. I’m writing about this because I’m not sure that this is an isolated case and that someone else may encounter the same situation.
Trimmer more broad concept than a lawn mower (motor mower), since it can also be electric. Gasoline trimmer and a lawn mower are the same thing.
Some authors claim that a trimmer is a weaker tool, in contrast to a more powerful brush cutter, which can be used for mowing bushes. Personally, I have a tool with a maximum power of 1.7 kW and, as stated in the instructions, it is capable of mowing small shrub up to 10 mm thick. The user manual is called “Gasoline trimmer...”.
I read somewhere that if the operating manual for the lawn mower and the oil canister indicate different proportions for preparing the fuel mixture, you should use the proportion indicated in the manual.
For a long time I did this - excess oil flowed from the engine onto the gas tank and carbon deposits constantly formed on the spark plug, since the manual indicated the proportion for a run-in engine was 1:25, and on the canister - 1:50. After switching to a ratio of 1:50, the appearance of oil drips stopped. The spark plug continued to burn, but with less intensity (the carburetor was not yet adjusted).
Until now, some users of gas-powered tools determine the proportion of the fuel mixture “by eye.” If the amount of oil is underestimated when preparing the mixture, after some time an extraneous sound may appear immediately after starting the engine, which gradually disappears during warm-up, and the engine stops with a sharp jerk. Continuing to operate the trimmer in this mode will result in its failure.
During the worst times of running a trimmer with an unadjusted carburetor, the engine would stop starting after using each tank of fuel. And only after cleaning the spark plug from carbon deposits could work continue.
Fine sandpaper was used to clean the electrodes, and a thin paper clip with a bent end was used to clean the space between the insulator and the housing. First, the electrodes were wiped from large dirt with a rag, then cleaned sandpaper. After this, the candle was lowered into diesel fuel and the moistened carbon deposits were scraped off with a paper clip from the surfaces of the insulator, the inside of the body and between them. Next, the candle was dipped into diesel fuel several times, which was then shaken off along with the dirt. Sometimes the paperclip cleaning and rinsing procedure was repeated. After this, the candle was wiped dry and was ready for further use.
Incredibly, one tank of fuel mixture with an unadjusted carburetor can be used up in less than 10 minutes - tested in practice when the trimmer was started and operated at high speeds with maximum fuel supply (the adjusting screw was unscrewed much more than normal).
Modern chainsaws have a complex system and consist of several main components, which at times require maintenance and adjustment. Here we will talk about how to adjust the carburetor on a chainsaw Husqvarna.
Problems, the solution to which will be adjustment carburetor is enough. Adjusting the carburetor of the Husqvarna chainsaw is necessary when defects such as:
This is by no means a complete list of problems that can be solved by adjusting the Husqvarna carburetor. In a number of different cases, adjusting the properties and amount of fuel consistency is carried out after a major overhaul of the engine or during scheduled maintenance of the chainsaw.
The manufacturer Husqvarna AB recommends adjusting the carburetor before and after break-in.
For successful implementation of the chainsaw carburetor option Husqvarna you should know its structure and understand how it works. The reality for our client is not as difficult as it might seem.
The saw carburetor has an integrated fuel pump, which is responsible for transporting the mixture of gasoline and oil, and additionally a diaphragm, a needle valve with a rocker arm. Their joint work allows the fuel supply to be dosed into the main chamber and two dampers.
One of the dampers is designed to regulate the flow of fuel into the cylinder when you press the gas, it is called the throttle, the second is responsible for limiting the flow of air from the air filter to facilitate starting a cool Husqvarna chainsaw. At the moment when the operator shuts off the air supply to the carburetor using the air damper, the fuel mixture becomes leaner and its supply to the cylinder increases, due to which the chainsaw starts much easier than in this case, when a cool start is carried out in normal mode.
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The operation of the Husqvarna carburetor involves a valve-nozzle, which sprays fuel and ensures the flow of air into the main chamber. Often, difficulties during operation of the saw will be caused by shortcomings of this particular element. For example, if the chainsaw is stored incorrectly, the valve may stick, the fuel supply will end, which will make the engine impossible to operate. Also, disturbances in the operation of the nozzle will cause air to leak into the main fuel chamber of the carburetor. In this case, adjusting the position of the adjusting screws will not correct the situation; it will be useful to carry out repairs differently by changing the unit.
Three adjusting screws installed in the carburetor body are responsible for setting the properties and amount of consistency, and similarly the number of crankshaft revolutions in idle mode:
Screws (L) and (H) cannot be adjusted without specific knowledge and experience. Incorrect adjustment of the properties and amount of fuel consistency leads to the fact that the engine will not work or works incorrectly, which will lead to rapid wear and tear, or even jamming.
An ordinary slotted screwdriver will not work for adjustment, since the adjusting screws on Husqvarna chainsaws have a different cross-section. You'll have to buy a special one, this feature Repair of Husqvarna chainsaws, they have created what remains to be done for our client, so that you can repair the saw exclusively at the Husqvarna special service center.
Carburetor Husqvarna is adjusted in the same way as carburetors on chainsaws from other manufacturers are adjusted.
Before the adjustment itself, you need to carry out a full diagnosis of the saw and make sure that there is no difficulty in supplying fuel or air leaks into the chainsaw crankcase. You also need to make sure that the air filter is clean and, if necessary, replace it with a new one.
The order of work is as follows:
After the adjustment, the chainsaw should simply pick up and drop speed, work steadily at low and high speeds. If the saw chain spins at idle after adjusting the carburetor control screws, this is a sign that the adjustment was carried out incorrectly and the position of the screw (T) needs to be adjusted.
Also, when adjusting the Husqvarna carburetor, it is worth taking into account the response time of the chainsaw to the rotation of the screws. Options do not change immediately, within 5, 10 seconds.
One of the characteristics of an incorrectly carried out adjustment is strong smoking during operation of the saw, which indicates a large amount of fuel entering the combustion chamber. In this case, it is necessary to adjust the position of the screw (L).
The standard factory options for the Husqvarna carburetor are the position of the screws (H) and (L), in which a working chainsaw should be guaranteed to start. For Husqvarna instruments, this is one and a half turns from fully tightened screws (H) and (L). During the adjustment, you must first set the screws to the standard position, then start the chainsaw and make precise adjustments to the power, the number of maximum revolutions and idle speed.
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If during a workable version of the chainsaw diagnostics Husqvarna carburetor shortcomings were discovered, then some of course should be removed without appealing to service center Husqvarna AB. For example, without the help of others you can:
Gaskets, diaphragms and a needle valve with a rocker arm can easily be found in the repair kit, which is available for each model of chainsaw carburetors Husqvarna.
Also, if you have some experience, there is an option to try to return the faulty injector valve, however, it is impossible to guarantee a positive outcome when trying to restore the injector; if it malfunctions, the Russian auto industry advises replacing it carburetor quite.
The first thing you need to do is ahead of time to remove carburetor from Husqvarna, this is to clean the saw if there is a compressor, since dirt can interfere with high-quality repairs. Next, you need to open the top cover of the chainsaw, remove the air filter, disconnect the rods from the air and throttle valve control levers. Subsequently, unscrew the carburetor mounting screws.
Disassembling the carburetor body for repairs is quite easy. The main chamber cover is held in place by 4 screws, which can be removed using an ordinary screwdriver; the fuel pump cover is secured using 1 wide screw.
Below is a video, after watching which it will become clear how exactly there is an option to repair the carburetor without calling the Husqvarna service center.
Work on setting up or repairing the carburetor on Husqvarna chainsaws is carried out even without any specific experience. To be able to do everything possible correctly, you need to follow the method and have a small set of tools. It is also worth assessing your strengths in advance and not taking risks if you are completely unaware of the technique. Believe me, it is better to pay a small amount to the master than to damage the instrument by adjusting it yourself.
Adjusting the Carburetor of the Homlight Chainsaw... How to set up a carburetor on a chainsaw: recommendations The carburetor of a chainsaw is one of the main components of this tool. He is responsible for supplying fuel. The efficiency and power of equipment depends on how correctly it functions...
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Adjusting the carburetor of the Husqvarna trimmer is identical to adjusting the carburetor of the Husqvarna chainsaw.
And to be sure that the Husqvarna engine is working as expected and that the maximum efficiency of the trimmer (gasoline trimmer, brush cutter) is ensured.
Before adjusting Husqvarna, do Maintenance trimmer (wash the trimmer and engine, replace the spark plug, eliminate minor defects).
Be sure to wash the foam air filter element. Wash the item in warm water with soap, then wring out and dry (or replace if old or damaged).
Note: If you adjust a Husqvarna carburetor with a dirty air filter, then after cleaning the air filter the fuel mixture will become much leaner (which can lead to bad work or even engine failure). 
Install a trimmer head with a cord of the maximum permissible diameter and standard length (up to the cutting blade in additional protection) to create a load on the engine while adjusting the high speed screw of the Husqvarna carburetor. 
Start the lawn mower according to the Husqvarna Manual and warm it up for 10 minutes (if the trimmer head rotates at idle, then the idle screw, i.e. the lower one, must be turned counterclockwise until the rotation of the trimmer head stops). 
Carefully turn both needles (right and left) to the middle position between fully unscrewed and fully screwed in (do not turn by the stopper!, this may cause damage to the Husqvarna engine).
There are three adjusting screws for adjusting the Husqvarna carburetor: right, left and bottom. 
1) Right screw L– regulates the enrichment of the mixture at low speeds (adjusted first):
Find the maximum idle speed by slowly turning the right screw left and right.
Then turn this screw ¼ turn counterclockwise.
Note: From the Husqvarna factory the right hand screw was turned out completely (0.5 turn). Now he's looking at 11 o'clock. 
2) Bottom screw T– adjusting the idle speed of the Husqvarna engine (if necessary): turning the screw clockwise increases the idle speed, counterclockwise reduces it.
Note: From the factory (Husqvarna), the idle speed screw was unscrewed by 8 full turns and “2 o’clock” (now it remains so). The recommended idle speed of the Husqvarna lawn mower engine is 2,900 rpm. 
3) Left screw H– regulates the enrichment of the mixture at high speeds (adjusted last).
It regulates maximum speed, engine power, temperature and fuel consumption.
Note: The Husqvarna engine should not run at full speed for more than 10 seconds!
This completes the Husqvarna adjustment.
Note: On a new Husqvarna trimmer from the manufacturer (Husqvarna), the left screw was completely unscrewed (0.5 turn) and blocked (filled) with hard plastic, which I drilled out after the warranty expired. Now the left propeller (like the right) is pointing at approximately 11 o'clock.
The engine revs quickly, smoothly and confidently, and revs a little at maximum speed; the T-35 trim head should not rotate at idle.
The required composition (quality) of the air-fuel mixture is adjusted (changed) by turning the screws for adjusting the fuel supply to the intake air flow (right and left). The amount of mixture entering the cylinder is dosed by the throttle valve.
If they are turned clockwise, the mixture sucked into the cylinder becomes leaner (less fuel in the air/fuel ratio) and the engine speed increases, while the Husqvarna engine runs softer (weakly picks up speed) and the power drops significantly. In addition, at higher speeds, less oil and gasoline enter the cylinder with a lean mixture (worse lubrication), and this can cause the engine to spoil. Well, the trimmer will have trouble starting.
If the screws are turned counterclockwise, the mixture sucked into the cylinder becomes richer (more fuel in the air/fuel ratio) and the engine speed decreases, while at low speeds more gasoline and oil enter the cylinder (better traction, better lubrication), but the Husqvarna engine “spins up” poorly (does not pick up speed well) and more carbon deposits form in the cylinder!
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