Husqvarna 128r doesn’t idle. From personal experience

husqvarna, 128r, doesn, idle, personal, experience

Husqvarna grass trimmer fuel system. Husqvarna adjustment. Limiting maximum rpm

lawn mowers, like all petrol garden tools, are not difficult to maintain. To repair, tune by yourself is possible and necessary. For example, adjusting the carburetor of a lawn mower with my own hands is a matter of five minutes.

The carburetor from a lawn mower is a node in the power system. In it, as well as any carburetors, there is a process of mixing air and fuel (gasoline) for further feeding into the engine cylinders.

In this process, the main thing. the correct proportion of fuel and air, for which regulate the carburetor.

Repair (modification) of starter motor of brushcutters Husqvarna 128r. From the “Custom Home” series.

Minor redesign of starter.

For uninterrupted and long service life, experts recommend using oil from Husqvarna.

Husqvarna gasoline pumps can be repaired with your own hands, like replacing a clogged air filter. And it’s conveniently located under the cover for easy access. You don’t need any tools to change it. In the case of a breakdown, it is better to deliver the equipment to the service center, because ignorance of the principles of operation of individual parts can only make the situation worse.

The most common problems with Husqvarna 128R gasoline pumps are problems with ignition or fuel supply. In the first case, the gas grass trimmer either stops within a few dozen seconds, or does not start at all. To do this, check the spark plug system. If it is wet, then you probably need to properly adjust the carburetor. Or the problem comes from improper starting, then you should carefully study the manual.

If the spark plug is dry, the fuel mixture is not coming. Most often this is due to a dirt filter or hose that is clogged. The filter should be replaced (better to do it every 3 months) and the hose just needs to be cleaned.

Gasoline grass trimmer of this model can last for many years, the main thing. Follow the rules of operation and timely check and replace the necessary parts. In addition, Husqvarna 128R is fully consistent with its quality and performance.

Adjusting the Husqvarna 128r Carburetor With Your Own Hands

You can adjust the carburetor of your lawnmower with your own hands

Lawn mower, like all gasoline tools for the garden, is not a difficult technique to maintain. Repair, adjust without the help of others is possible and necessary. For example, adjusting the carburetor of a lawn mower with their own hands. a matter of 5 minutes.

The carburetor from the lawnmower is a node in the power system. In it, as well as all carburetors, there is a process of mixing air and fuel (gasoline) for the upcoming feeding into the engine cylinders.

In this process, the main thing. the correct proportion of fuel and air, and why adjust the carburetor.

The main problems and malfunctions of the carburetor.

Mesh filter. to become adjustment of the carburetor, gasoline saw Husqvarna with your own hands. Self-adjustment of the lawnmower carburetor with your own hands is impossible without preparatory work, knowledge of theory, understanding of the device of the fuel system. Adjusting the carburetor of a lawnmower with their own hands There are two tasks with this item most often:

In order to find out the cause of the malfunction unscrew the fuel filter cover to remove the strainer. Adjusting the Husqvarna carburetor on our Husqvarna 128R lawnmower. If it is just a dirty accumulation, it can be washed in gasoline or blown with a soft cloth.

In case of visible damage on the strainer, it is imperative to put a new one. There can also be damage to the fuel supply pipe (when repairing check this element).

The carburetor starter almost always fails because of clogs. Adjusting the Husqvarna 137 carburetor. Proper carburetor adjustment is important in the proper operation of the Husqvarna 137 chain saw, tension. Husqvarna 55, its technical characteristics, purpose and features. Adjusting the carburetor on your own, such as Husqvarna and Partner. Adjusting the carburetor with your hands. Use acetone or the same gasoline for flushing.

Blowing out clogged carburetor parts with compressed air is an acceptable and comfortable repair practice.

Adjust the Husqvarna Grasshopper Carburetor 235 P

Adjust the Husqvarna carburetor if:

Adjusting the Husqvarna carburetor

Before setting up your Husqvarna, perform maintenance on your grass trimmer (wash the gasoline engine and motor, replace the spark plug, repair minor defects).

Be sure to wash the foam element of the air filter. Wash element in warm water and soap, then wring and dry (or replace if old or damaged).

Note: If you adjust the Huskvarna carburetor with a dirty air filter, the fuel mixture will become much leaner after cleaning the air filter (which can lead to poor performance or even engine failure). Install a grass trimmer with a cord of the maximum allowable diameter and standard length (up to the cutting disc in the extra guard) to put stress on the engine while adjusting the high-speed screw of the Husqvarna carburetor. Start the gasoline pump according to the Husqvarna Manual and warm it up for 10 minutes (if the grass trimmer head rotates at this idle speed, the idle screw, t.е. lower, must be turned counterclockwise until the grass trimmer head stops rotating ). Carefully turn both needles (right and left) to the middle position between fully unscrewed and fully screwed (do not turn it on the stop!, This can damage the Husqvarna engine).

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READ Adjusting the carburetor on your Sadko brushcutter

There are three adjustment screws for adjusting the Husqvarna carburetor: right, left, and below.

1) Correct screw L. Adjusts the low-speed mixture enrichment (first adjustment): Find the maximum idle speed by slowly turning the right-hand screw to the left and right. Then turn this screw 1/4 turn counterclockwise. Note. Husqvarna factory had the right screw turned all the way around (0.5 turns). It is now looking at 11 o’clock.

Husqvarna 125R carburetor adjustment without tachometer (temporary solution)

,if you need to work, and the service with the tachometer is far away.

Adjusting the carburetor of the Husqvarna 125, 128 brushcutter

Hupsquan 125, 128 (without tachometer) Part No: 5450818-48.2) Bottom screw T. Adjust the idle speed of the Husqvarna engine (if necessary): Turn the screw clockwise to increase the idle speed, counterclockwise to decrease it.

It is considered correct to adjust the idle speed when:

  • Cold engine runs stable at idle speed.
  • Hot engine does not have too high idle speed.
  • There is still enough RPM left before the grass trimmer head is turned.
  • Engine runs steadily in any position (e.g., when the blade is lowered sharply).

READ Adjusting the carburetor of the Husqvarna 135 chainsaw

Note: From the manufacturer (Husqvarna) the idle speed screw has been turned from fully turned to 8 full rpm and “2 hours” (now it remains). The recommended idle speed for the Husqvarna gasoline engine is 2,900 rpm. 3) Left screw H. adjusts high rpm mixture enrichment (corrected in the last turn). It adjusts the maximum speed, engine power, temperature, and fuel consumption.

Note: The Husqvarna gasoline engine should not run at full power for more than 10 seconds!

  • Fully open the throttle (give full throttle) and slowly turn the left screw clockwise until the Husqvarna engine speed decreases (by ear).
  • Then slowly turn the left screw counterclockwise until the engine starts to run unevenly.
  • Then slowly turn the screw a short distance clockwise until the Husqvarna engine starts to run smoothly.

This is the end of the Husqvarna setting.

Note: Recommended maximum high-speed Husqvarna motor. 11,500 rpm. The maximum power output of the Husqvarna 333R gasoline engine is 1.6 kW (2.1 L.с.) at 8,400 rpm.

Note: On a new Husqvarna trimmer from the manufacturer (Husqvarna), the left screw was completely unscrewed (0.5 turns) and blocked (poured out) with hard plastic, which I drilled after the warranty expired. Now the left screw (like the right screw) looks about “11 o’clock”.

READ How to adjust the carburetor on a Husqvarna 240 chainsaw

We check that the Husqvarna carburetor is properly configured

The engine is fast, steady and sure to pick up speed, and a bit quadruple in maximum rpm, the T-35 grass trimmer head should not rotate at idle.

Reference. Read to understand what you’re doing!

Required composition (quality) of air (changes) by turning adjusters in intake air flow (right and left). The amount of mixture fed into the cylinder is metered by the throttle. If they are turned clockwise, the mixture drawn into the cylinder is depleted (less fuel in the air/fuel ratio) and the engine speed increases, and the Husqvarna engine is softer (picks up speed weakly) and power drops. Also, with increased turnover, less oil is fed to the cylinder on a lean mixture (lubrication is worse), and therefore the engine can be damaged. Well, the grass trimmer will be bad. If the screws are turned counter-clockwise, the mixture sucked into the cylinder is enriched (more fuel in the air/fuel ratio), and the engine speed is reduced, and at low speeds more gasoline and oil gets into the cylinder (better traction. Better lubrication), but the Husqvarna engine “deflects” poorly (hard to pick up speed) and produces more carbon deposits in the cylinder!

How to Adjust the Carburetor On a Husqvarna 128r Grass Trimmer

Modern chainsaws have a complex system and consist of several major components, which at times require maintenance and adjustment. Here let’s talk about how to adjust the carburetor on a Husqvarna chainsaw.

The problems that can be solved by adjusting the carburetor, enough. Husqvarna chainsaw carburetor adjustment is needed when such defects occur, such as:

  • high idle speed;
  • strong smoking during the operation of the tool;
  • Difficulty starting a cool or hot motor;
  • Lack of traction and low maximum rpm.

This is not a complete list of difficulties, the solution to which will be the adjustment of the carburetor Husqvarna. In a number of cases, the adjustment of properties and quantity of fuel consistency is carried out after the overhaul of the engine or during the scheduled maintenance of gasoline saw.

Husqvarna AB manufacturer recommends adjusting the carburetor before and after running-in.

To successfully perform a Husqvarna chainsaw carburetor adjustment, it’s important to know the setup and understand how it works. The real left to do for our customer is not as hard as it may seem.

The saw’s carburetor has an integrated fuel pump, which is responsible for transporting the consistency of gasoline and oil, and of course the diaphragm, a needle valve with a coringula. They work together to dispense fuel to the main chamber and the two flaps.

One of the flaps is designed to regulate the flow of fuel into the cylinder when you press the gas, it is called throttle, the other. is responsible for limiting air flow from the air filter to facilitate starting a cool chain saw Husqvarna.

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The moment the operator shuts off the air flow to the carburetor with a choke, the fuel consistency is emptied and the flow to the cylinder is increased, thus making the chain saw much easier to start than when a cool start is made in standard mode.

The Husqvarna carburetor operates with a nozzle that sprays the fuel and prevents air from entering the main chamber. Quite often it is the fault of this element that causes difficulties during saw’s work.

For example, the valve, with improper storage chainsaw can stick, the fuel supply will end, making the work of the motor is not feasible. Also, malfunctions of the nozzle can cause air leaking into the carburetor’s main fuel chamber.

In this case, the adjustment of the position of the adjusting screws will not fix the situation, it is useful to repair or replacement unit.

For the adjustment of the quality and quantity of consistency, and the number of revolutions of the crankshaft in the idle mode are responsible three adjustment screws installed in the carburetor housing:

  • Screw (L). adjusts the amount of fuel working in the mode of low and medium revolutions;
  • (H). is responsible for the thrust at high revolutions and their quantity;
  • (T). adjusts throttle valve position to control the amount of fuel consistency entering the cylinder and the engine idle.

Screws (L) and (H) cannot be adjusted without some knowledge and experience. Improper adjustment of fuel consistency and quantity will cause the engine to stop working or work incorrectly, leading to drastic wear and tear or even to seizure.

An ordinary slotted screwdriver is not an adequate screwdriver for adjusting the. к. The adjusting screws on Husqvarna chain saws have different sections. It will be necessary to purchase a special, this peculiarity of Husqvarna chain saws repair, they have created what remains to be done by our customer, so the saw can be repaired only in a special service Husqvarna.

Husqvarna 125R carburetor adjustment without tachometer (temporary solution)

The Husqvarna carburetor is adjusted similarly to how carburetors are adjusted on chainsaws by other manufacturers.

Before the adjustment it is necessary to make a complete diagnostics of the saw and make sure that there is no blockage of fuel supply and no air sucking into the chainsaw crankcase. Also make sure that the air filter is clean and if necessary replace it with a new one.

  • On a switched off saw the factory options of Husqvarna carburetor are installed.
  • The engine is started and the saw is warmed up in a few minutes.
  • Turn the screw (L) clockwise to the position when the engine develops the most speed, after that the screw should be turned back 1⁄4. If with all this the chain of the chain saw rotates, it is necessary to reduce the idle speed by adjusting the position of the screw (T).
  • The next step is to adjust the power of Husqvarna at the highest rpm and adjust the number of rpm. For this purpose, you connect the tachometer to a running chainsaw, throttle knob is squeezed to the full, then check the tachometer readings. If the value of the highest revolutions differs from the highest number recommended by the manufacturer, the tachometer readings are brought back to normal by adjusting the screw position (H).

After adjustment the chainsaw should run in and out of rpm, operate smoothly at low and high rpm. If the saw chain spins at idle after adjusting the carburetor control screws, it is an indication that the adjustments are not correct and that the carburetor control screw (T) needs adjusting.

When adjusting the Husqvarna carburetor it is also worth taking into account the chain saw’s response time to turning the screws. The options do not change overnight but take 5 to 10 seconds.

Huskavrna grass trimmer 128R-repair

One of the characteristics of a wrong adjustment is a strong smoke when the saw is working, which indicates a large amount of fuel entering the combustion chamber. If this occurs, adjust the position of the screw (L).

How the lawnmower carburettor works

The throttle valve controls the amount of airflow and thus the engine output depends directly on the throttle valve.

Fuel is sucked into carburetor system by pump (its diaphragm). Then flows through the nozzle in the carburetor. The fluid then moves through the inlet and outlet valves of the pump. Is filtered by the grid. flows through the needle valve into the diaphragm chamber.

  • Air supply to the tube with air baffle (damper). The throttle damper controls the intensity of the air flow.
  • The fuel supply system is necessarily narrowed by a diffuser to increase the flow rate.
  • Gasoline flows through the float chamber and restrictor tube. The float chamber regulates the temporary volume of petrol. In the float chamber, the pressure level is neutral, but in the tube with the constriction is already low. Thanks to the pressure differential, the fuel flows through the nozzle.
  • The acceleration of the air flow promotes the transfer of fuel (gasoline) and its atomization. The result is an air-fuel mixture of the desired proportion or density.
  • The air-fuel mixture enters the engine cylinder through the fuel tube.

The area of the open air damper determines the level of air density in the system. The wider the damper is open, the greater the fuel flow and power.

Simply speaking, adjusting the carburetor on a chainsaw is about creating the optimal fuel mixture by correcting the air supply.

Husqvarna 128r brushcutter starter repair (rebuild). From “Private Home” series.

Slight modification of the starter.

Husqvarna makes various appliances and tools for home, garden, forest, and construction. Husqvarna chainsaws, cultivators, shears, riders, lawnmowers and all other products are made only with the latest developments and quality materials. Exactly because of unmatched reliability of the tools Husqvarna is known all over the world and is in great demand.

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Gasoline grass trimmer 128R by Husqvarna is designed for small and medium-sized areas, and is suitable for cutting grass near inaccessible places (beds, curbs). Equipped with a two-stroke engine with 0.8 kW or 1.1 L displacement.с. Turning speed of Husqvarna 128R reaches 11000 rpm. Engine is designed with E-Tech 2 technology, which significantly reduces exhaust emissions from the trimmer. Its displacement is 28 cm3.

To get the tool to work quickly even after long periods of inactivity it has a built-in primer for pumping up the fuel and a “Smart Start” system. The maximum working width is 45 cm. The Husqvarna 128R is a straight-boom gasoline grass trimmer with professional bicycle-style handles. This gives better control of the operation and direction of the tool. Straight booms are considered more reliable than curved ones. Handles can be folded for easy transport.

The tool weighs 4.8 kg without fuel, mounted cutting parts and blade guard. That means the Husqvarna 128R gasoline grass trimmer can be used for extended periods of time without interruption. The gasoline grass trimmer’s fuel tank is made of white plastic, for easy monitoring of the amount of fuel left in it. Gasoline tank has a capacity of 400 ml. A gentle pull of the cord is all it takes to start the lawnmower, because the amount of pulling force required has been reduced by 40 percent.

  • 4-blade blade for tough, tall grass or bushes
  • trimmer head (semi-automatic)
  • 2-shoulder belt attachment;
  • wrench set;
  • Bicycle handle;
  • The user manual and service manual;
  • protective hood;
  • fixed boom.

the trimmer line is used to remove only fine grass.

The start button on your Husqvarna lawnmower automatically returns to the home position so that it’s quicker and easier to switch the trimmer back on. Special blade for cutting grass does not shred it, but tucks it into windrows. The blade guard and line trimmer cover are the same, and there’s no need to remove it during equipment changes.

Specialists recommend using Husqvarna two-stroke engine oil for consistent, long life.

Husqvarna lawn mowers can be repaired with your own hands, such as replacing a clogged air filter. The more so because it is located in a convenient and easily accessible place under the cover. You don’t need any tools to change it. In the case of a breakdown, it is better to take the technique to the service center, as ignorance of the principles of operation of individual parts can only aggravate the situation.

The most common faults of the Husqvarna 128R lawnmower are problems with ignition or fuel supply. In the first case, the gasoline grass trimmer either stops after a few tens of seconds, or does not start at all. To do this, you should inspect the condition of the spark plugs of the ignition system. If it’s wet, you’ll probably need to properly adjust the carburetor. Or the problem is caused by improper starting, so read the manual carefully.

If the spark plug is dry, it means that there is no fuel mixture. Most often it is caused by a clogged fuel filter or hose. The filter should be changed (better every 3 months) and the hose should only be cleaned.

Gasoline trimmer for grass of this model can serve for many years, the main thing to follow the rules of operation and timely inspection and replacement of necessary parts. The more so that the price of the Husqvarna 128R fully corresponds to its quality and performance.

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Great machine. Started to stall once, but cleaning the flame thrower fixed everything.

Greetings! My name is Peter. From my youth I liked to collect automodels and paragliders, later my hobby grew into something bigger and I worked as a handyman for a long time in the “man for an hour” company. For many years of experience in my piggy bank are a huge number of different schemes and implementations of repair and installation with their own hands of various devices. Not all “recipes” are mine, but I believe that such knowledge should be in the public domain. This is the reason for creating this site.

To summarize

At the first signs of chain saw malfunction, it is worth to carry out a full diagnosis. To avoid damage to the saw as a result of improper maintenance, the work of identifying and troubleshooting the engine is better left to professionals. And most importantly, you should not use a chainsaw with minor defects, t. к. This will lead to even more problems.

Owners of chain saws have to deal with the fact that the saw, without any apparent circumstances, stops working normally. To understand why the chainsaw stops working in different modes of operation, and now to outline the most diagnose malfunctions, we will try in our article.

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