Adjusting the carburetor of the Husqvarna 128r. Fuel Pump Problems

Adjusting the Husqvarna. Lawn mower carburetor adjustment can be done with your own hands Husqvarna petrol mower does not work at full power

Lawn mowers, like all power tools for the garden, are not difficult to maintain. You can and should repair, tune up by yourself. For example, adjusting the lawnmower’s carburetor with your own hands is a matter of five minutes.

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

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

Major carburetor problems and malfunctions.

Mesh There are only two problems with this element:

To determine the cause of the malfunction, unscrew the fuel filter cap to remove the strainer. If there is just dirt accumulated on it, it will help to rinse with gasoline or blow.

Be sure to install a new filter if there is any visible damage. There could also be damage to the fuel line (try checking this element during the repair).

Carburetor starter almost always fails due to clogs. For washing, use acetone or the same gasoline.

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

Throttle body, carburetor parts packages, intake or exhaust pipe. All of these parts are subject to depressurization. You can probably check the simple way. Cover the problem area with soap scum.

From personal experience

Lawn mower or grass trimmer

Grass trimmer is a broader term than lawnmower (lawnmower), as it can also be electric. A gasoline grass trimmer and a lawn mower are one and the same.

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Some authors assure that the grass trimmer is a weaker tool, unlike a more powerful lawnmower, which can be used to mow bushes. Personally, I have a tool with a maximum power of 1.7 kW and capable, as stated in the instructions, to mow small bushes up to 10 mm thick. The owner’s manual is called a gasoline grass trimmer. “.

The proportion of fuel mixture

I read somewhere that if the lawnmower manual and the oil can indicate different proportions of fuel mixture, you should use the proportion indicated in the manual.

For a long time I did that. the engine oil surplus was flowing down to the gas tank and the plug was constantly covered with soot because the manual stated the ratio for a running-in engine as 1:25, but the canister says 1:50. After switching to a 1:50 ratio the oil drip stops. The spark plug was still burning, but with less intensity (carburetor was not yet adjusted).

How to adjust the carburetor on the brush

Read it for yourself

Further adjust the carburetor make pliers yourself by adjusting the screws. There are three of these:

Right (L). Adjusting the fuel mixture for low rpm.

You need to find the maximum idle speed. To do this, slowly turn the screw (L) to the right and to the left.

To adjust, turn the screw a quarter turn necessarily counterclockwise.

Bottom (T). Responsible for adjusting engine at idle speed.

To properly adjust the idle speed, as a rule of thumb:

  • Stable operation of the cold engine;
  • Not too hot engine speed;
  • Large trimmer head cabinet;
  • Stable operation of engine when changing position (sharp rise or fall of blade).

Left (N). Adjusting mixture at high speed. (Screw set last).

Left screw (H) determines overall control of maximum speed, engine power, temperature, and gas mileage.

Adjust the carburetor Brushes with the last screw as follows:

adjusting, carburetor, husqvarna, 128r
  • Open the throttle to full, while releasing the full throttle. Turn screw clockwise until speed decreases (in which case they focus on the ear).
  • Turn screw as slowly counterclockwise as possible until engine begins to run erratically.
  • Then turn back a little, barely hearing stable, smooth operation.
  • For a clearer application of skills, it is more convenient to consider the work of an experienced user:
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Interestingly, from the point of view of the author of the video, the tuning (its correctness) is determined by the color of the spark plug, and not just by the speed and stability of the engine.

Proper adjustment of the carburetor with his own hands in this case. It is to burn the fuel mixture without residue, the color of the spark plug should be light brown.

Main problems and malfunctions of the carburettor.

Mesh filter. There are two tasks with this element more often than not:

In order to find out the cause of failure unscrew the fuel filter cover to remove the mesh filter. If it’s just clogged up with mud, flushing in gasoline or purging will help.

If there is any visible damage to the strainer, it is essential to replace it with a new one. There may also be damage to the fuel supply pipe (when repairing the practice of checking this element).

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

Throttle body, carburetor component linkages, inlet or outlet piping. all of these parts are subject to depressurization. To check probably can be simple method. put soap foam on the problem area.

Chainsaw chain

The advantage of these chainsaw models are the standard chainsaw chains. Almost any chain of bar length (40 cm in general) with a slot width of 1 will do.3 millimeters, chain pitch. depending on model. For chains beginning with “1”. 3/8″. which is true for Model 135, for counterparts beginning with “4”. 0.325″.

In any case you can use any chain for your chainsaw, just keep an eye on its tensioning. To adjust the chain tension, use the adjusting screw and the rule that the chain should not sag on the bar, sit fairly firmly, but at the same time should not hinder the rotation of the sprocket, when off, the chain should easily scroll over the bar of the chainsaw by hand

An important feature of the adjustment is that the chain is slightly stretched during operation, so you must periodically check its tension. The correct adjustment is 1/4 turn of the adjusting screw.

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When to Carry out Adjustment

Adjustment of the carburetor is necessary in the following cases:

  • the new engine has been run-in (4-5 litres of fuel mixture was used);
  • the fuel composition (oil and gasoline grade) has changed;
  • weather changes (it became hot, cold);
  • The air rarefaction has changed (applies to mountainous areas);
  • after a long storage time;
  • the load on the engine has increased (after a tool change, etc.); or.д.);
  • vibration caused the adjustment screws to unscrew spontaneously;
  • fuel consumption has increased, the carburetor overflows fuel;
  • the electrodes of the spark plug quickly become soiled (if the fuel mixture is prepared correctly)
  • The engine starts and immediately stops or picks up poorly;
  • There is no gasoline flowing into the cylinder;
  • A large number of exhaust gases.

To summarize

If you see the first signs of a chainsaw malfunctioning, it’s worth doing a complete diagnosis. In order to avoid damage to the saw as a result of improper maintenance, the work of identifying and troubleshooting engine problems is best left to professionals. And most importantly, you don’t want to use a chainsaw with minor defects, t. к. it will lead to more problems.

Owners of chainsaws have to deal with the fact that the saw, without any apparent circumstances, ceases to operate normally. To understand why the chainsaw stalls in different modes of operation, and now to outline, the most diagnose the malfunction, we will try in our article.

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