How To Install An Ignition Coil On A Hitachi Trimmer

Any person who owns a summer cottage or land is well aware of the problems of combating excess vegetation. Now a trimmer has come to the rescue, which has successfully replaced the usual braid in this field. This unit is very convenient to use, but it, like any mechanism, tends to fail due to difficult working conditions or incorrect operation. Situations are quite common when the trimmer does not gain momentum. To understand this problem, you need to understand some aspects related to the operation of the device.

Features of the trimmer

All trimmers are classified by type of power: gasoline or electricity (from the mains or battery). It should be noted that gas mowers in many respects surpass their electric and battery counterparts. Despite the fact that they all perform similar functions, the difference in performance, maneuverability and efficiency is very noticeable. However, the general principle of operation of all types of hand-held mowers is almost the same. the devices are equipped with engines (two- or four-stroke ICEs or electric motors) that drive the cutting unit (reel with fishing line or metal disk). All elements are fixed on a straight or curved rod, including a handle for controlling the trimmer, on which the main buttons are located.

How To Install An Ignition Coil On A Hitachi Trimmer

Since the problem of low revs is more characteristic of the gasoline versions of trimmers, more attention will be paid to them. So, the lawn mowing is very comfortable in operation and unpretentious in maintenance. over, most of its malfunctions are caused by the user’s ignorance of the elementary things that are described in the instructions. Therefore, before starting operation of the unit, it is necessary to carefully study the manufacturer’s manual. In particular, to start the engine, it is necessary to do the following sequential actions:

  • turn on the ignition button;
  • press the silicone button several times to pump gasoline;
  • close the air damper;
  • set the throttle lever to high revs;
  • first make slight jerks with the starter handle to feel the resistance of the engine, then sharply yank.

If the lawn mowing is started, but stalled, you need to put the air damper in the middle position and try again. When the engine is working, you need to slow down the gas and open the air damper, since the trimmer only works on the suction.

Important! The operating mode of the trimmer depends on various environmental influences. In hot weather, the unit needs to be given more time to cool. When working in dense thickets or high vegetation, the engine also overheats. It is necessary to take five-minute breaks every 15-20 minutes.

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Causes of weak trimmer revs

If users complain about a trimmer that is not gaining momentum, this means that at idle it works fine, and when you press the gas it does not develop the necessary power. This may happen as a result. long idle time of the device without activity. These problems are typical for gasoline vehicles, including Husqvarna 128r, Stihl FS 38 and Hitachi of various modifications.

When working with the trimmer, you need to monitor its behavior all the time. a drop in speed and unusual noise signal a malfunction in the unit. Sometimes you give gas, and the trimmer floats. In such cases, the work must immediately be stopped, the mechanism allowed to cool down and proceed with the search for possible problems. They can be of a different nature, both the technological plan, and external factors associated with the conditions and features of the operation of the device.

External factors

Several factors unrelated to its breakdown influence the reduction of revolutions of the lawn mowers:

  • the filter is dirty due to the ingress of particles of dirt and dust;
  • use of low-quality fuel;
  • improperly prepared mixture (relevant for trimmers with two-stroke gasoline engines);
  • pollution of the silencer mesh by vegetation particles, soil elements and other objects.

over, in the second and third case, carbon deposits in the combustion chamber, and clogged carburetor elements.

technical issues

Technical problems of lawn mowers mainly occur in the fuel supply and ignition systems. You can deal with them yourself.

  1. When the hand mower does not start or stalls, the problem may be with the candle. Dark soot indicates poor carburetor adjustment and low quality gasoline.
  2. A clogged fuel hose may be a cause of trimmer malfunction. Filters are also often clogged.
  3. Another internal problem. the muffler is covered with soot. This greatly reduces the speed of the trimmer. Exit. you need to clean the muffler.

Video: How To Install An Ignition Coil On A Hitachi Trimmer

Important! If the unit does not work due to engine breakdowns, serious problems can arise. In this case, malfunctions that can be eliminated by oneself include only the destruction of the piston rings. In case of more serious problems with the motor, if there is no guarantee, you should be prepared to visit the workshop.

Diagnostics and troubleshooting of petrol engines

Before proceeding with the repair of a particular unit (part), it is necessary to determine the nature of the malfunction. Step-by-step diagnostics and troubleshooting. further.


This mechanism is an important component of the gas trimmer. In order for the carburetor to work properly, several conditions must be observed:

  • disassemble and clean it at times;
  • adjust the idle speed according to the instructions;
  • refer to the wizard for help with adjustment.
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In the event of a breakdown of this unit, it is possible to repair it yourself, but only if you have certain knowledge.

One of the reasons for carb carb malfunctioning is relaxed cable. To fix the problem, you first need to disassemble the entire assembly, and then, thoroughly rinsing all the parts, grease and tighten the cable, but not very much so as not to stretch.

Important! Other malfunctions can also negatively affect the operation of the carburetor: failure of the intake needle, deformation of the membrane, wear of the adjusting lever, contamination of the adjusting cavity, wear of the dampers.


In case of problems with a candle, sometimes it is enough to dry it or sand it with sandpaper and put it back in place, setting the gap correctly. it should be 1 mm. If the candle is very covered with soot, it is better to replace it with a new one. With the optimal operating mode of the trimmer, the candles do not so often fail.


Clogging air filter ─ Another reason for the unreliable operation of the device. To check the involvement of this element in the malfunction, you need to start a lawn mowing without it. A dirty filter can be washed in gasoline, dried or replaced with a new one.

Clogged fuel filter does not pass fuel into the cylinder, and the engine stalls at full throttle due to an elementary lack of gasoline. This element is located inside the tank on the intake hose. To fix the problem, instead of the old filter, put on a new hose or rinse thoroughly the one that was removed.

Advice! If you try to pull out the plug in the tank, the hose together with the filter may fall into the tank. You can get them with tweezers.


The engine is the most important part of any unit. The causes of engine failure are several:

  1. wrong proportions of oil with fuel (for push-pull);
  2. old fuel mixture;
  3. wear and destruction of the piston ring;
  4. traces of scratches on the cylinder and piston;
  5. operation of the apparatus for wear.

All this leads to the fact that the engine either does not start or stalls.

Important! If all other parts and components of the trimmer can be repaired by yourself, then with the motor you need to be extremely careful. This work is best entrusted to a specialist. Piston, gaskets, cylinder, rings may be subject to repair.

Fuel system

For the trouble-free operation of the gas trimmer, the functioning of the fuel system is of great importance. Gasoline passes through all its components and parts, so they should be cleaned regularly. In addition, only high-quality fuel must be used. For the preparation of a combustible mixture in a two-stroke engine, motor automotive oil cannot be used, since it has insufficient qualities.

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Diagnosis and troubleshooting of electric motors

Trimmer failures can be as follows:

  • insulation failure or cable breakage;
  • malfunctions in the area of ​​the cutting tool;
  • damage to the socket or plug.

To cope with these breakdowns, you do not need to disassemble the entire device.

On a note! Before starting the repair, it is important to prepare the necessary tool: a set of screwdrivers, a tester, a soldering iron, an indicator, a set of keys.

With serious engine trouble have to disassemble it. To do this, unscrew a few screws. Having access to the details of the motor, you need to carry out such actions:

  • check the degree of wear of the brushes. unsuitable parts will need to be replaced with new ones;
  • ring the motor winding. the resistance should be high;
  • check the stator and rotor. to test the rotor winding with a multimeter, measure the resistance: large deviations from the norm indicate a malfunction, the lack of resistance on the stator winding also indicates a breakdown (the stator case is diagnosed in the same way).

Advice! Solving the problems associated with faulty electrical components is fraught with great difficulties. Often they are easier to replace with new parts than to take the time to rewind.

Problems with low revs are common for cheap trimmers. However, with improper maintenance, manual mowers such as Huter, Patriot 3055, and Echo also suffer from this.

When to contact the workshop

If the device is under warranty, at the first sign of malfunctioning, it can safely be taken to a specialized workshop. Repair will be done free of charge, regardless of the nature of the damage, if it happened through no fault of the owner. In the event of engine breakdowns, it is better for a person ignorant of the technique to consult a specialist immediately. In any case, the severity of problems with the unit is determined by the user.

Summarize. Both gasoline and electric trimmers are designed for many years of reliable operation. Most of the problems described above are due to insufficient attention of the owner to his assistant. Subject to strict adherence to requirements from the manufacturer and regular maintenance, the hand mower will operate rhythmically and without interruption.

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