How To Change The Ignition On The Trimmer

Trimmer ignition. principle of operation and possible malfunctions

If the owner of the lawn mower wants to adjust the ignition system on his own, he should understand the principle of operation of this unit. In an internal combustion engine, it consists of a flywheel and a magneto (coil). In turn, the flywheel includes an impeller that performs the function of cooling the motor and a number of permanent magnets.

How To Change The Ignition On The Trimmer

Diagnostics of magneto

Magneto is a key component in engine ignition systems. It is a core coil that is surrounded by a primary and then a secondary winding. If this part is defective, there is no spark on the spark plug and the fuel will not ignite.

The first way

You can check the performance of the magneto using a tester. To do this, you must perform the following sequence of actions.

  • Correctly configure the tester: use the resistance measurement function and set 200 Ohms to take measurements of the primary winding.
  • Direct the first electrode of the measuring device to the “ground” of the magneto, and the second to the output contact. If the primary winding is good, the readings should be from 0.4 to 2 ohms.
  • Set the tester switch to 20KΩ to diagnose the secondary winding. Then direct the first dipstick to the candle cap, and the second to ground. If everything is in order, the figures will vary from 4 to 6 Kom, depending on the trimmer model, whether it is a Patriot 547, a Husquarna 128 r or another brand of equipment. If the circuit is open, the tester will display an infinity value. And if there was a short circuit, the display will show zero.
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The main problems and malfunctions of the carburetor.

Mesh filter. With this element, there are often only two obstacles:

In order to find out the cause of the breakdown, the fuel filter cap is unscrewed to remove the strainer. If dirt just accumulates on it, then flushing in gasoline or blowing will help.

If there is visible damage to the strainer, 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).

The carburetor starter in most cases does not work due to blockages. Use acetone or the same gasoline for flushing.

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

The body of the throttle valves, the places of the bundles of the carburetor parts, the intake or exhaust pipe. all of these parts are subject to depressurization. You can probably check with a simple method. smear the problem area with soapy foam.

Why do I need ignition adjustment

In some cases, when the engine does not start, ignition adjustment will be required. Of course, first you need to check the condition of the candle and the high-voltage cable with a cap.

It is necessary to adjust the ignition on a two-stroke engine in order to ensure timely ignition of the fuel in the engine combustion chamber. Below is a diagram from which you can understand the principle of operation of the internal combustion engine.

The spark in the plug should appear at the moment the fuel is compressed by the piston, when it does not even reach the top dead center (TDC). When the piston passes TDC, the fuel mixture ignites, as a result of which the piston goes down under the action of the explosion energy.

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Therefore, if for some reason (mainly due to the displacement of the flywheel on the shaft relative to its original position), the fuel ignites before the piston passes TDC, then it goes back, and the crankshaft rotates in the opposite direction. This movement can damage the starter assembly, cut the starter cord, etc. In this case, early ignition of the fuel occurs.

There may also be a late ignition on the trim: the piston, after compression of the fuel that has not ignited, goes down, and at this moment a spark appears. In this case, the engine will either not start, or will significantly lose power and it will be bad to gain speed.

But such problems with early or late ignition on two-stroke internal combustion engines are quite rare, since the flywheel with magnets is already installed in the correct position, which is perfectly synchronized with the movement of the piston. In addition, the flywheel is secured to the shaft with a key and nut. Therefore, incorrect installation of the part is excluded.

Basically, ignition adjustment is about setting the correct gap between the magneto and the flywheel.

How to set the ignition on the trimmer

Often, owners of gasoline braids are faced with the fact that the ignition does not work on their equipment. In most cases, the problem is really with this node. To fix it, you need to adjust the ignition on the trimmer. But at the same time, it is not uncommon for the ignition coil to be in good working order, and the breakdown must be looked for elsewhere. The ignition system is arranged in the same way on four-stroke and two-stroke internal combustion engines, therefore, troubleshooting of this unit is performed in a similar way. In addition, the technique of different brands has almost the same design of this most important component of the tool, which means that the adjustment process will be identical both for the Soyuz or Prorab trimmers, and for Huter or samples of other brands.

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The principle of operation of the carburetor lawn mowers

The throttle valve determines the amount of air for supply, and the power of the motor directly depends on this.

Ignition Trim Adjustment

Do-it-yourself lawn mowers carburetor adjustment

Lawn mowers, like all gas powered garden tools, are not difficult to maintain. It is possible and necessary to repair, configure without the help of others. For example, adjusting the carburetor for lawn mowers with your own hands is a matter of 5 minutes.

A lawn mower carburetor 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, why they regulate the carburetor.