VIDEO How to adjust carburetor , if you need to work, and the service with a tachometer is far away.
Carburetor petrol cutters Shtil, Makita, Husqvarna and others are adjusted using adjusting screws. Sometimes the reason for the malfunction is a violation of fixation - due to vibration or damage to the protective cap. Such a breakdown can be detected by simply trying to turn the screw a little: if the fixation is not rigid, it is worth checking the setting.
Setting up the module does not apply to repair and replacement of spare parts is not required. Honda lawn mower carburetor cleaning. In this case, the carburetor repair kit for the brushcutter is not needed.
Three screws are provided for debugging:
L - is regulated first, since it is responsible for supplying fuel at low speeds;
H - he is responsible for the supply of gasoline at high speeds, as well as for fuel consumption and temperature;
T - it is used to debug idle.
There are options, as a rule, this is the carburetor of a Chinese petrol cutter, when only one screw remains on the body for debugging - for adjusting the idle speed. This does not mean that the module is configured automatically - it means that it will be difficult to carry out even such a type of repair as debugging. In the photo - adjusting the carburetor of a Chinese petrol cutter.
If there is a tanometer, and if the recommended rpm values are indicated in the product passport, the correction can be made more accurate, focusing not on hearing, but on the readings of the device.
6 comments per post &Adjustment and carburetor repair
Please clarify. In the adjustment section p. 5, screw L error? Should you read screw A? Thanks to.
prompt the initial position of the screws H L LA
SHOW START POSITION
prompt the initial position of the screws H L LA
The benzokos is one of the main tools of the summer resident, used to quickly put the land in order.Owners of private houses also purchase this tool for mowing grass in the backyard. The period of active use of petrol cutters and electric trimmers is in the summer. Before starting operation, the tool is put into working condition: rubbing parts are lubricated, the cutting attachment is changed, a fuel mixture is poured into the tank. If the engine does not start at all or stalls quickly, without gaining a sufficient number of revolutions, then you have to look for the causes of the malfunctions and eliminate the identified malfunctions. To repair a petrol brush with your own hands, you need to understand its structure and the principle of operation of the main units. This information can be found in the instructions for use, which the manufacturer applies to the garden equipment without fail. Check for such a guide when purchasing your chainsaw. The imported tool must be accompanied by instructions written in Russian.
A long tubular rod is attached to the gearbox of a two-stroke internal combustion engine. A shaft passes inside the rod, which transfers torque from the gasoline engine to the cutting mechanism. The line or knives rotate at 10,000 to 13,000 rpm. There are holes in the protective housing of the gearbox, into which grease is injected with a syringe. For the convenience of using the tool, the manufacturer equips it with a special adjustable shoulder strap.
A cutting attachment is attached to the brushcutters:
The line, which varies in thickness from 1.6 to 3 mm, is located in the trimmer head. The line is subject to wear during mowing. Changing the line is quick and easy in two ways: by winding a line of the same diameter onto a bobbin or by installing a new spool with line already wound.
Steel knives with double-sided sharpening for the benzokos for clearing the area from weeds, small bushes, hard grass. Knives differ in shape and the number of cutting surfaces.
On the U-shaped, D-shaped or T-shaped handle, which is attached to the boom, there are the petrol cutter control levers. The cutting mechanism is protected by a special casing. Household brushcutters are filled with a mixture prepared from gasoline and oil, which is poured into the fuel tank. The device of semi-professional and domestic brushcutters, equipped with a four-time gasoline engine, is slightly different. The filling scheme is also different: oil is poured into the crankcase, and gasoline is poured into the tank.
The measured piece of fishing line is folded so that one end is 15 cm longer than the second.We put the loop into the slot on the spool and start winding in the direction indicated by the arrow
If you cannot start the petrol cutter, then the first step is to check the presence of fuel in the tank and its quality. For refueling the tool, it is recommended to use high-quality gasoline purchased at gas stations, the grade of which must be at least AI-92. Saving on cheap fuel can lead to a breakdown of the cylinder-piston group, the repair of which can take a third of the cost of the brushcutter itself. It is equally important and correct to prepare the fuel mixture from gasoline and oil. The proportional ratio of these components of the mixture is indicated by the manufacturer in the manual. It is not necessary to prepare the fuel mixture in large volumes, since its properties are lost during long-term storage. Better to use a freshly prepared mixture.
When preparing the fuel mixture, pour oil into gasoline using a medical syringe, which allows you to accurately observe the required proportion of components
A dirty fuel filter in the tank can also prevent the brushcutter from operating. Therefore, if problems arise with starting the motor, check the condition of the filter. Replace the filter if necessary. Do not leave the inlet pipe without a fuel filter.
The air filter also needs to be checked. When contaminated, the part is removed, washed in gasoline in the field and put in place. In the country or at home, the filter can be washed in water using detergents.After that, the filter is rinsed, wrung out and dried. The dried filter is moistened with a small amount of oil used to prepare the fuel mixture. Excess oil is removed by squeezing the filter with your hands. Then the part is installed in place. The removed cover is put back and secured with screws.
The air filter, washed in a fuel mixture, wrung out and dried, is installed in place in a plastic case and closed with a lid
You can see how this procedure is done in more detail in the video:
If all of the above procedures are carried out, and the engine does not start, then adjust its idle speed by tightening the carburetor screw. In the video posted at the beginning of the article, attention is paid to this issue.
Place the tool on its side with the air filter at the top. This arrangement of the chainsaw ensures that the fuel mixture hits the bottom of the carburetor. The engine will start on the first attempt if you remove the air filter and pour a few drops of the mixture into the carburetor before starting, then reinstall the dismantled parts. The method has been tested in practice.
If the first tip doesn't work, then the problem is most likely in the spark plug. In this case, unscrew the plug and check its functionality, and also dry the combustion chamber. Replace the candle that does not show signs of life with a new one.
If the spark plug is in good working order, the filters are clean and the fuel mixture is fresh, then you can use the universal method of starting the engine. Close the carburetor choke and pull the starter handle once. Then open the choke and pull the starter 2-3 more times. Repeat the procedure three to five times. The engine will definitely start.
Some pull the handle with such force that they have to repair the starter of the petrol cutter with their own hands. This is only possible if the cable breaks or the cable handle breaks. In other cases, it is recommended to replace the starter. This unit is sold assembled.
Stop the engine and wait for it to cool down.
Disconnect the high voltage wire from the spark plug.
Unscrew the part using a special wrench.
Inspect the spark plug for replacement. The part changes if it is defective, heavily soiled, has a crack on the case.
Check the electrode gap. Its size should be 0.6 mm.
Tighten the new spark plug inserted into the engine with a wrench.
Install the high-voltage wire to the center electrode of the spark plug.
As you can see, there is nothing super complicated in this procedure.
A new spark plug for a two-stroke internal combustion engine of a gasoline streamer is installed to replace the old part that is out of order
After starting, the engine may stall if the carburetor is incorrectly tuned or misaligned. What are the signs that you can understand that the reason really lies in this? It is very simple, by the vibrations that will be clearly felt when the mower is running. You can adjust the fuel supply with your own hands by following everything that is written in the operating instructions for the tool.
The engine may stall due to a clogged fuel valve. The cause is eliminated by cleaning it. If the brushcutter starts up and then suddenly stalls, it means that the fuel supply to the carburetor is difficult. Loosen the carburetor valves to ensure that the correct amount of fuel can flow to it.
Excessive air intake can also stall the engine. Increase engine revs to allow air bubbles to escape faster from the unit's fuel system. Also, be sure to check the integrity of the fuel intake hose.If you find mechanical damage (cracks, punctures, etc.), replace the part.
During the period of operation of petrol cutters, monitor the condition of the engine cooling system. The channels in the starter housing and the cylinder fins must always be clean. If you ignore this requirement and continue to operate the brushcutter, you can damage the engine due to overheating.
Competent care of the gasoline scythe during operation allows you to use it for several seasons in a row without major repairs
Allow engine to cool before cleaning. Take a soft bristled brush and clean the outside of the dirt. Cleaning of plastic parts is carried out with solvents, including kerosene, or special detergents.
At the end of the summer season, the brushcutter must be prepared for long-term storage. For this, the fuel mixture is drained from the tank. The engine is then started to use up fuel residues in the carburetor. The entire tool is well cleaned of contamination and goes to "hibernation".
As you can see, it is possible to repair the faults of a household petrol cutter on your own. It is worth contacting service departments in case of serious breakdowns. In this case, the cost of repairs should be correlated with the price of a new petrol cutter. It may be more appropriate to buy a new instrument.
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Good afternoon, I was faced with the issue of replacing the breather (valve) in Husqvarna 236, 240. It turned out easy to remove, but back. is the installation going through the filler hole?
The adjustment procedure for the Husqvarna 128R carburetor is straightforward.
1. We set the line out of the trimmer head 15 cm long on each side (this significantly affects the speed).
2. We dilute AI-92 gasoline with Husqvarna engine oil for two-stroke engines in a ratio of 1:50 (one part oil to 50 parts gasoline). For ease of calculation, we recommend a ratio of 1 liter of fuel x 20 milliliters of oil. For the first start of the streamer, we recommend a ratio of 1 liter of fuel x 23 milliliters of oil (ratio for running in the engine). Strict adherence to these ratios and the use of only Husqvarna two-stroke oils will ensure long engine life and the supplier's warranty in the event of a warranty claim.
3. We launch the scythe and bring it with the throttle stick to maximum
revolutions. With the right adjusting screw H, we adjust the speed to the level of 8500 - 8800 by the tachometer.
4. We release the throttle stick. At idle, on top of the carburetor, with the adjusting screw T, we bring the idle speed to the level of 3000 - 3200 on the tachometer. In this case, the motor should run smoothly, without jerking. The trimmer head should stop rotating.
5. In case of visible smoke from the exhaust gases or unstable idling at the set idle speed, adjust the “mixture quality” with the left adjusting screw of the carburetor L.
Having trouble adjusting the carburetor for your Husqvarna 128R brushcutter?
The practice of servicing Husqvarna's gasoline-powered tools at our service center has shown that the need for adjustment arises periodically for other models of Husqvarna's chainsaws and brushcutters. These adjustments, by analogy with the method described for adjusting the carburetor of the Husqvarna 128R petrol cutter, can be made by any user independently. Below, for reference, we give the engine speed indicators for various equipment and in various modes.
Self-adjustment of the carburetor gas cutters do it yourself is impossible without preliminary work, knowledge of the theory, understanding of the structure of the fuel system. Annotation for the repair of the carburetor.
petrol cutters with their hands - a matter of 5 minutes.
The carburetor from the petrol cutter is a unit in the power system. In it, like all carburetors, there is a process of mixing air and fuel (gasoline) for the forthcoming supply to the engine cylinders.
In this process, the main thing is the correct proportion of fuel and air, which is why they regulate the carburetor.
Mesh filter. With this element, most often there are only two tasks:
In order to find out the cause of the breakdown, the fuel filter cap is unscrewed to remove the strainer. If dirt has simply accumulated on it, then flushing in gasoline or blowing 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 repair, they practice checking this element).
Blowing out parts of a carburetor with a blockage with compressed air is an acceptable and comfortable repair practice.
The throttle body, the places where the carburetor parts are bundled, the inlet or outlet pipeline - all of these parts are subject to depressurization. You can probably check with a simple method - smear the problem area with soapy foam.
The diffuser is equipped with fuel channels. From them, fuel is drawn in with the help of a stream of air.
Outside the carburetor is installed:
fuel pump;
jet system;
a system for adjusting the consistency of fuel with air;
VIDEO How to adjust carburetor , if you need to work, and service with a tachometer is far away.
VIDEO How to adjust carburetor brushcutters Husqvarna 125, 128 (without tachometer) Part number: 5450818-48. Carburetor .
The throttle valve determines the amount of air to be supplied, and the engine power directly depends on this.
Fuel is sucked into the carburetor system by a pump (its membrane). Then it passes through the choke in the carburetor. The fluid then flows through the pump inlet and outlet valves. Filtered by the grid. It moves through the needle valve into the diaphragm chamber.
Phased operation of the device:
Air supply to a tube with an air baffle (damper). The baffle regulates the intensity of the air flow.
The fuel supply system is necessarily narrowed by a diffuser to increase the flow rate.
Gasoline through the float chamber and the nozzle tube with a constriction. A float chamber adjusts the temporary volume of gasoline. In the float chamber, the pressure level is neutral, and in the tube with a constriction it is already low. Due to the differential pressure, the fuel flows through the nozzle.
The acceleration of the air flow facilitates the transfer of fuel (gasoline) and its atomization. As a result, an air-fuel mixture of the required proportion or density is formed.
The air / fuel mixture enters the engine cylinder through the fuel pipe.
The level of air density in the system depends on the area of the open air damper. The wider the throttle is open, the greater the fuel consumption and power.
Simply put, adjusting the carburetor on a petrol cutter is the creation of an optimal fuel mixture due to the correct air supply.
Further adjusting the carburetor DIY petrol cutters performed by adjusting screws. There are three of them:
Right (L) - adjustment of the fuel mixture for low rpm.
You need to find the maximum idle speed. To do this, slowly unscrew the screw (L) left and right.
To adjust, turn the screw a quarter of a turn always counterclockwise.
Lower (T) - is responsible for adjusting the engine at idle speed.
clockwise - increase;
counterclockwise - decrease.
For the correct adjustment of the idle speed, it is characteristic:
stable operation of a cold engine;
not overestimated speed of a hot engine;
a large reserve of turns for the trimmer head;
stable operation of the engine when changing position (sharp lifting or lowering of the knife).
Left (H) - regulation of the mixture at high speeds. (The screw is adjusted last).
The left screw (H) determines the general adjustment of maximum speed, engine power, temperature and gasoline consumption.
Customization carburetor petrol cutters with the last screw is performed as follows:
Open the throttle to full, while at the same time give full throttle. Turn the screw clockwise until the revolutions drop (in this case, orientate by ear).
Turn the screw counterclockwise as slowly as possible until the engine runs unevenly.
Then turn back quite a bit, barely hearing a stable, even operation.
For a more visual use of skills, it is more convenient to consider the work of an experienced user:
Interestingly, from the point of view of the author of the video, the setting (its correctness) is determined by the color of the candle, and not only by the speed and stability of the engine.
115302726 Rev. 2 7/15/10 Russian - 28
ATTENTION! Always use
Air filter needed
Incorrect carburetor operation
Loss of engine power
Excessive wear of parts
Excessive fuel consumption
Therefore, the filter is necessary damaged
The bevel gear is filled with
Usually, the lubricant does not need
stop the engine before
Home »Starter Repair Husqvarna 128r Video
VIDEO
Repair (rework) starter brushcutters husqvarna 128r ... From the series "Private House".Small design change starter .
To make the tool turn on quickly even after long periods of inactivity, it has a built-in primer for priming fuel and the Smart Start system. The maximum working width is 45 cm. The Husqvarna 128R Petrol Brush Cutter is a petrol trimmer with a straight boom and professional handles, made in the shape of a bicycle. This allows much better control over the work process and the direction of the tool. Straight boom designs are considered more reliable than curved booms. The bike handles can be folded to make it easier to transport the brushcutters.
knife with 4 blades for hard and tall grass or bushes;
trimmer head (semi-automatic);
harness for 2 shoulders;
a set of keys;
bicycle handle;
operation and maintenance manual;
protective cover;
non-separable bar.
The line is used to remove only small grass.
The Husqvarna petrol cutter start button automatically returns to its original position to make it easier and faster to re-engage the trimmer. A special blade for cutting grass does not crush it, but puts it into swaths. The blade guard and the line trimmer are the same cover and do not need to be removed when changing the rig.
For a smooth and long service life, experts recommend using Husqvarna 2-stroke engine oil.
You can also do the repair of the Husqvarna petrol mowers with your own hands, such as replacing a clogged air filter. Moreover, it is located in a convenient and easily accessible place under the cover. No tools are needed to replace it. In the event of a breakdown, it is better to take the equipment to a service center, since ignorance of the principles of operation of individual parts can only aggravate the situation.
If the spark plug is dry, it means that the fuel mixture does not flow. This is most often due to a clogged fuel filter or hose.The filter should be replaced (it is better to do this every 3 months), and the hose just needs to be cleaned.
VIDEO
ATTENTION.
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Video (click to play).
Excellent machine. Once it started to stall, but cleaning the flame carrier fixed everything.
