How to Adjust a Carburetor On a Trimmer

A modern gasoline trimmer is a complex unit, which also includes a carburetor. It is from its reliable and proper operation that performance will depend. The trimmer carburettor must be adjusted in the following cases:

  • After engine break-in (as a rule, it is necessary to use 4-5 liters of gasoline for this);
  • Before the beginning of the mowing season;
  • If during operation from vibration, the adjusting screws are loosened loosely.

Taking into account the fact that the trimmer does not belong to the category of complex units, carburetor adjustment can be done by yourself.

Functions and working principle

In order to understand how the petrol scraper carburetor is arranged, it is worth getting acquainted with its working principles. The main elements of the carburetor include a throttle, the function of which is to perform control of the air supply. The operation of such a device as a carburetor can be considered in stages.

  • Air supply to the compartment where the throttle is located.
  • Moving air flow facilitates the movement and atomization of fuel through the nozzle.
  • The resulting mixture (air fuel) is fed into the engine cylinder.

Acquainted with these basic steps, we can conclude: the more the throttle is open, the greater the consumption of gasoline in the mowing process.

Carburetor adjustment for lawn mowers

Before you begin the adjustment, you need to very carefully clean the filters. This work must be carried out in accordance with the instructions from the manufacturer. Further work with the carburetor is done by adjusting the three screws.

  • The right screw. Adjusting the air-fuel mixture. Turning the screw left and right is idling. It is necessary to determine the maximum speed.
  • Left screw. Adjust the air-fuel mixture. Work is performed at high speeds. The screw is regulated last and foremost, engine power and gas mileage will depend on its proper setting.
  • Bottom screw. Engine operation adjustment. The work is idling. Clockwise rotation indicates increase, counterclockwise indicates decrease.

The last left screw is adjusted as follows:

  • The throttle fully opens and full gas is squeezed out;
  • The screw rotates clockwise until the speed decreases (orientation by ear);
  • Turn the screw counterclockwise until the engine is not smooth. Intermittent;
  • We turn the screw in the position in which it ensured stable and smooth operation of the engine.

How to adjust the carburetor gasoline lawn mowers?

The principle of adjustment is the same for almost all types of carburetor.

I will consider the example of the Husqvarna 128R trimmer.

There are three adjusting screws on the carburetor.

Which are denoted by the letters L, H, T.

After that we release the throttle stick and set the engine idle using screw T. The engine should idle smoothly, stably and without twitching. The trimmer head must not rotate.

If the engine smokes and (or) the engine idles unsteadily, we adjust the “mixture quality” with screw L.

If necessary, the adjustment procedure can be repeated.

First, we say that the carburetor adjustment of gasoline lawn mowers should be carried out in the following cases:

But many adjust their carburetor’s carburetor to be sure that the engine is working as it should.

Before starting the adjustment, the trimmer must first be serviced (the trimmer and engine should be washed, the spark plug should also be replaced and minor defects should be eliminated). Do not forget to wash the foam element of the air filter (it is better to do this in warm water with soap, and then dry it properly).

So, now let’s move on to carburetor adjustment:

There are only three adjusting screws for adjusting the brushcutter carburetor: right (L), left (H) and lower (T).

1). Right screw (screw L). Controls the enrichment of the low-speed mixture (this screw is regulated first):

First we find the maximum idle speed by quietly turning the right screw to the right and left. Then turn this screw a quarter (ΒΌ) of a turn counterclockwise.

2). Bottom screw (T screw). Provides engine idle adjustment. If you turn it clockwise, then the idle speed increases, if counterclockwise decrease.

Correct adjustment is considered when:

3). And finally, the left screw (screw H). It controls the enrichment of the mixture of high speed (it is regulated last).

The left screw adjusts the maximum speed, engine power, as well as temperature and fuel consumption.

On this, in fact, the adjustment is complete.

Correctly adjust the carburetor gasoline lawn mowers can only specialists of specialized workshops.

But there are such cases that you need to adjust yourself. Usually this is when large idle speeds or even the petrol trimmer stalls when the speed is reduced.

There are two adjusting screws on the body of the carboturator of the gas trimmer.

One is for regulating the fuel supply, and the second is for adjusting the idle speed.

If the cutting element of the lawn mowing rotates, this means that you need to turn the idle screw counterclockwise until the coil stops rotating.

If you need to increase the number of idle speed. You need to turn the screw clockwise.

But I would not recommend adjusting the quality of the mixture with a special screw.

I tried it myself, so the brushcutter stopped starting. And what I just did not do. I had to go to the workshop, where they all returned to the factory settings, or even better. Now I don’t stick my nose at the adjusting screws and I don’t advise others.

Basically, carburetor adjustment gasoline lawn mowers same on most products. Here you can watch a on how to adjust the carburetor on different lawn mowers.

The universal instruction is as follows:

  • The main thing is to understand that there are only three adjusting screws on the carburetor and each has its own designation: L, H, T.
  • Before starting the adjustment, pour gasoline and only after that the plant will give them a braid at full power.
  • Now we need the adjustment lever H, on which the screw puts 8500 revolutions, so as not to make a mistake, we can use the tachometer.
  • Set the engine to idle using T.
  • In case smoke started, L will help regulate the quality of the mixture.

Any carburetor has three types of adjustment. This is the maximum fuel supply (that is, the maximum shutter stroke that allows you to set the maximum speed), the screw to adjust the amount of air supplied to obtain the fuel-air mixture, and idle speed. According to these adjustments, any classic carburetor can be adjusted. Perhaps on imported braids it does not have an adjustment of the amount of air supply. Usually, tuning is not required throughout the life of the spit.

The main purpose of the carburetor in the brushcutter is to mix fuel and air in order to start the engine. If the engine freezes during idling, or, while idling, the blades are still in motion, then there is a need to adjust the idle screw on the carburetor.

You can do this as follows:

  1. Set the “Off” / “Off” switch on the top of the handle. Put the brushcutter on a flat, even surface and let it cool completely.
  2. Wear safety glasses and gloves.
  3. Turn on the brushcutter and let the engine idle a little bit. If the engine stalls, insert a small flathead screwdriver into the idle adjustment screw on the right front of the engine and turn it clockwise.
  4. Restart the brushcutter. If the knives move in the same way as at idle, turn the idle adjustment screw counterclockwise until they are adjusted to the desired state.

How to Adjust a Carburetor On a Carver Trimmer

DIY carburetor setup for chainsaw

For an independent carburetor option, it is necessary to familiarize yourself with its device and clarify the procedure for the work that is carried out to adjust the parts responsible for the proper functioning of the component parts of the device and parts close to it.

It is necessary to carefully handle objects for the system option, and also determine the compliance of the set characteristics with very acceptable values.

About carburetor design

The carburetor is used to mix a combustible consistency with air, subject to well-established proportions. If clear doses are not respected, the health of the motor is at risk. When a huge amount of air enters during the mixing of the component, and there is not enough fuel, such a mixture is considered “poor.”

It should not be allowed and oversaturation, because with a large amount of fuel in comparison with air, malfunctions or deterioration of the motor are also likely. Adjustment of the carburetor is necessary not only before the initial implementation, but also when any differences in its work are revealed. Before working with a chainsaw, do not forget to run it in.

Carburetor parts

The carburetor design contains a standard set of parts, but may vary little depending on the manufacturer. Components:

  1. The foundation. This is a special tube that visually resembles an aerodynamic design. Air passes through it. In the transverse direction in the middle of the pipe is a damper. Her position can be changed. How to adjust the carburetor to How to change the piston on the trimmer. The more it is pushed into the passage, the less air enters the engine.
  2. Diffuser. This is the lent out part of the tube. Here’s what it looks like on how to adjust the carburetor on a chainsaw to set up. With its help, the air supply rate increases in the segment where the fuel comes from.
  3. Channels to supply fuel. The fuel mixture is contained in the float chamber, then passes into the nozzle, from which flows into the spray.
  4. Float chamber. It is a separate structural element that resembles the shape of a tank. Designed to constantly maintain an optimal level of fuel fluid before entering the channel from where air comes.

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What you need to have to configure

Each carburetor owner must have the necessary tools to adjust this system. There are three adjusting screws that are located on the device. They have their own markings:

  • L. Screw for low speed correction.
  • H. Screw for adjusting high revs.
  • T. Regulates idling, in most cases it is used for experiments.

Chainsaw Air Filter

Before adjusting the carburetor, you need to prepare the device:

  1. The engine warms up, that is, it starts about 10 minutes before repair, and turns off when work starts (see how to start a chainsaw).
  2. The air filter is checked and flushed.
  3. The chain is stopped by turning the T screw all the way (see chain oil).

To carry out safe repairs, you need to prepare a flat surface where you can neatly position the device and unscrew the chain in the opposite direction. Need a tachometer. It determines the presence of a malfunction in the carburetor. When turning the screws, the sound should be perfect and absolutely even. If screeching notes are noticed, then the mixture is oversaturated.

Setup Instructions

Carburettor adjustment is divided into two main stages. The first is called basic. How to adjust the carburetor on the brushcutter. Carburettor adjustment at full speed. How to adjust the carburetor while looking at the candle :. It is made with the engine turned on. The second is performed when the engine is warm.

To carry out the carb adjustment procedure successfully, you need to familiarize yourself with the instruction manual specific model to identify additional features of the device settings.

First stage

The adjusting screws for the highest and lowest revolutions should be carried out clockwise until the highest resistance is encountered. When the screws reach the stop, you need to translate them in the opposite direction and leave when passing 1.5 turns.

Main stage

The engine starts at medium speed and it warms up like this for about 10 minutes. The idle adjustment screw should be clockwise. Here’s what it looks like in the diagram: how to adjust the carburetor on a chainsaw. It is released only when the engine comes into stable operation. It must be ensured that the chain does not move during this process.

Adjustment of the carburetor of the Chinese brushcutter. Practice.

Correct setting carburetor determined by the operation of the engine and the color of the candle. Adjusted.

How to adjust a carburetor on a brush cutter

My first channel: Free consultation.

In idle mode, the engine may stall (the reason is here). In this case, immediately adjust the adjusting screw clockwise to the stop. Sometimes the chain begins to move. In this case, turn the adjusting screw in the opposite direction.

Acceleration Test

If this does not happen or the speed increase is too slow, you must use the screw marked with the letter L. It turns counterclockwise. It is necessary to observe moderate movements, since the turn cannot be more than 1/8 of the full circle.

Maximum speed

If you make this figure more, the engine of the device will run to wear, which will lead to problems in the ignition system. When rotating this screw, the ignition processes of the device must be taken into account. If the slightest glitches appear, then the maximum speed value must be reduced.

Final idle check

Before this procedure, it is necessary to perform a full adjustment of the components of the carburetor when operating at maximum speed. Next, you should check the operation of the device in idle cold mode. How to clean a silencer on a Husqvarna trimmer 128 r, very often the problem of power loss lies on the surface and people without knowing it are trying to change the carburetor to Husqvarna be. When the correct parameters are reached during adjustment, you can see the exact compliance of the carburetor design with the following criteria:

  1. When the idle cold mode is connected, the circuit does not move.
  1. When even pressing the accelerator a little, the engine accelerates at an accelerated pace. With a gradual increase in pressure, you can notice that the engine speed is proportionally increasing, reaching the maximum allowable values.
  2. When the engine is running, you can compare its sound with a four-stroke device.

If violations are noted in the given parameters or the device was not fully adjusted, you need to perform the main setup step again. The story of how to adjust the carburetor chainsaw futlik There is a breather on this chainsaw. Sometimes actions are performed incorrectly. In this case, the device may fail due to the loss of the correct node settings. In this case, you will have to contact a specialist.

Dismantling the carburetor if necessary to check or repair the components

The device of different models of carburetors is almost the same, therefore, when working with them, you can use the standard scheme. All items must be removed carefully and then lay out in the order below, so that you can successfully arrange the objects in place at the end of the repair work.

Top cover removal

  1. The top cover is removed. To do this, unscrew the 3 bolts holding it in a circle.
  2. Foam is also removed, as it is the upper part of the filter that conducts air.
  3. The fuel hose is removed.
  4. The drive rod is displayed immediately on it.
  5. The cable tip is disconnected.
  6. The gas hose can be completely removed by steadily pulling it off the fitting.

To finally prepare the carburetor for a major overhaul or replacement of the smallest parts, you need to carefully disconnect it from the main system. Sometimes it requires further disassembly. Unscrew the components carefully and fold the fasteners in groups, as these small parts are easily lost.

Instruction for chinese

To correctly configure the carburetor of a Chinese chainsaw, you must first remember the factory settings of the device, then turn on the engine. In the future, you will have to leave it to work for several hours to accurately set your own parameters. Sometimes work is performed once after a ten-minute operation of the engine, but many Chinese-made models require special handling.

Chinese model of chainsaw

Adjustment Procedure:

  1. Events start at idle. Using the adjusting screws, you need to achieve a systematic set of revolutions by the engine, so you should first let it work at low speeds. A deviation from the norm is the movement of the chain along the bus. In this case, it is necessary to adjust the extreme position of the extreme screws so that the chain remains stationary.
  2. Switching to medium speed revs. Sometimes the engine smokes at the same time. This defect can be eliminated by tightening the screw to supply a leaner fuel mixture.

In this case, the smoke will disappear, but the engine speed will increase. It is necessary to adjust the settings to the level where, when you press the throttle, the engine gains speed, sharp jerks or interruptions are not heard.

How to Adjust a Carburetor On a Trimmer
  • Device engine check in progress. The chainsaw is transferred to the minimum speed, and then a rapid pressing of the lever is carried out. With maximum pressure, it is held for 3 seconds. If there is a malfunction in the engine, you need to gradually loosen the screw until the optimum position is reached.
  • Chainsaw should work for several hours in real conditions. It is necessary to engage in sawing wood, and then perform an inspection of all the elements involved in this event. If there are deviations, they need to be corrected using adjusting devices. When all defects have been eliminated and optimal settings have been set for the supply of correctly concentrated fuel, the process of setting up the device can be considered completed.
  • Look at the clearly:


    In order for the chainsaw to work properly, it is necessary to carefully carry out work on adjusting the carburetor in exact accordance with their priority. Here’s what it looks like on how to adjust the carburetor on How to adjust the needle. If there are any malfunctions in the operation of the device, you must independently perform its complete disassembly. How to adjust the carburetor Screw N set the speed as on different lawn mowers. In most cases, replacement of any parts that have become unusable is required.

    With a constant check of the quality of the carburetor settings and the implementation of timely actions to improve its operation, there are no problems with the chainsaw.