Wet spark plug in the trimmer: diagnosis and solution

The situation when the gasoline trimmer stops starting, often catches the owner by surprise in the midst of gardening. The most common symptom of this malfunction is a fuel-filled spark plug, which instead of a spark gives only wet soak. Wet candle indicates a violation of the proportions of the fuel mixture or problems with the supply of air, which makes it impossible to ignite in the combustion chamber.

Before you sort it out. carburetor or buy new parts, it is necessary to conduct a competent primary diagnosis. Often the problem lies not in engine failure, but in the elementary failure to follow the sequence of actions when starting or using low-quality fuel. Understanding the physics of the process will help avoid costly repairs.

In this article, we will discuss in detail the algorithm of actions when detecting a flooded candle, methods for its proper drying and setting up the fuel supply system. You will learn to distinguish normal garlic from signs of serious malfunction and will be able to return the tool to the system in a matter of minutes.

Causes of Fuel Getting to Electrodes

The main reason for the appearance of liquid on the electrodes is the re-enrichment of the fuel-air mixture. When there is too much gasoline and not enough air, the mixture does not have time to burn completely and settles on working surfaces. This phenomenon is often called “bay”, and it is characteristic not only for trimmers, but also for any gasoline equipment with a two-stroke engine.

A common mistake is repeatedly jigging the starter without trying to blow the cylinder. If the engine didn’t catch on the first time, further attempts simply pump new portions of gasoline, making the situation worse. carburetor continues to supply fuel until the piston makes a compression stroke with the correct mixture.

The quality of the fuel used should also be considered. Old gasoline or mixture with expired shelf life (more than 2-3 weeks) loses its properties and evaporates worse. As a result, the liquid fractions settle on plug-stickIt prevents the formation of a spark.

• 🛑 Repeated attempts to launch without pause for fuel evaporation.
• 🛑 Violation of the proportions of mixing oil and gasoline.
• 🛑 Air filter pollution that limits airflow.
• 🛑 A needle valve malfunction in the carburetor float chamber.

It is important to understand that even a serviceable tool can deafen and deafen when a sharp change in atmospheric pressure or temperature. Therefore, before looking for a breakdown, always check the condition of the air filter and the freshness of the fuel in the tank.

Diagnosis of candle and sodium

The appearance of the spark plug can tell a lot about the state of your trimmer’s engine. The color of the coar and the presence of moisture are indicators of the correctness of the combustion system. Regular visual inspection helps to identify problems at an early stage.

If the candle is wet, but there is a spark, the problem is most likely in violation of the ventilation of the crankcase or getting excess oil. When the electrodes are filled with gasoline and there is no spark, it is necessary to check the ignition system and dryness of the high-voltage wire. Ceramic insulator in good condition should be dry and have a brownish tint.

Particular attention should be paid to the gap between the electrodes. Too small a gap can lead to a weak spark, which is not able to ignite a rich mixture. Too much gap requires a higher voltage, which puts a strain on the ignition coil.

⚠️ Attention! If the candle is covered with a black oily coating, this may indicate wear of the piston group or the use of too much oil in the fuel mixture.

For accurate diagnosis, it is recommended to twist the candle and wipe it with clean rags. After that, you need to check the presence of a spark by applying the thread to the metal part of the engine (mass) and turbo-turbo-turbo starter. The spark should be bright blue and punch the gap with a characteristic click.

How to check a candle without a sparkmeter?

The simplest way is to twist a candle, put a cap on it, attach a threaded part to the engine metal (cylinder) and pull the starter. The spark should be clearly visible in daylight.

Algorithm of drying a flooded candle

The procedure for restoring the performance of the flooded trimmer requires strict adherence to the sequence of actions. Attempting to start the engine with a wet candle will only make the problem worse, so the first step should always be to dry the combustion chamber.

First, you need to shut down the fuel crane (if any) or squeeze the fuel hose. Then unscrew the spark plug and wipe it thoroughly with a dry cloth. Do not use abrasive materials that may damage the surface of the electrode.

Next, the engine cylinder should be blown. To do this, insert the candle into the cap, apply it to the mass of the engine (so that there is a spark) and make 10-15 sharp jerks with the starter. This action will remove excess fuel from the cylinder through the candle hole.

After drying, screw the candle back, observing the necessary tightening moment. Do not drag the candle so as not to damage the thread in the aluminum cylinder head. Now you can try to start the engine according to the standard algorithm.

If the engine does not start after 3-5 attempts, repeat the purge procedure. Sometimes it takes several cycles to completely remove gasoline vapors from the muffler and cylinder.

Adjustment of the carburetor and the quality of the mixture

If the candle is poured constantly, even after proper drying, the reason lies in the wrong setting of the carburetor. The fuel mixture may be too rich due to twisted screws adjusting the quality of the mixture. carburetor It is a precise mechanism that requires careful handling.

Most trimmers have one or three adjusting screws. The screw "L" (Low) is responsible for working at low revs, and the screw "H" (High) is responsible for high. If the screw "L" is twisted too hard, at idle speeds, excess fuel is received.

To eliminate the bay, you need to wrap the screw adjusting the mixture by 1/4 or 1/2 revolution. This will impoverish the mixture and allow the engine to work more stable. However, this should be done carefully so as not to overheat the engine.

Symptoms.	Probable cause	Action.
Candle wet, black garlic	Excess oil or rich mixture	Wrap the screw "L", change the fuel.
Candle dry, white garlic	Poor mix, risk of overheating	Turn the screw "L", check the filter
Candle in oil	Wear of piston or glands	Compression measurement, CNG repair
Candle brown, dry	Normal work.	Preventive cleaning

Remember that the factory settings of the carburetor can be lost due to vibration or intervention of an unqualified craftsman. Adjustment is better carried out using a tachometer, but in the field you can focus on the stability of the work and the color of the candle.

The effect of the air filter on the engine

A polluted air filter is one of the most common reasons why gas-light. If air access is limited, the carburetor continues to supply the same amount of fuel, resulting in a sharp enrichment of the mixture. The engine starts to “shock” and stop.

Owners of trimmers are advised to check the condition of the filter element after every 10-15 hours of operation. In dusty conditions (for example, when mowing dry grass), the check should be carried out even more often.

Filters come in different types: foam, felt and mesh. Fur foam can be gently washed in soapy water, but before installation they must be thoroughly dried and slightly soaked with oil (if this is provided by the instructions). Feel filters are better to change to new ones with severe pollution.

Ignoring filter cleaning leads not only to the bay of the candle, but also to accelerated wear of the piston group. Abrasive dust, getting into the cylinder, acts as sandpaper, reducing the compression and power of the tool.

• 🌬️ Remove the filter carefully so that dust does not get into the intake tract.
• 🌬️ Do not use open flames or heating appliances to dry.
• 🌬️ Change the filter immediately if it breaks or loses elasticity.

Prevention and proper storage of trimmer

To avoid launch problems in the future, it is important to store gasoline appliances properly. If you plan not to use the trimmer for a long time (more than a month), be sure to run all the fuel from the carburetor.

To do this, let the engine work at idle speeds until it itself stalls. This will prevent the carburetor membranes from drying and the internal channels from oxidizing. Residues of gasoline in the float chamber can turn into a resinous plaque.

Also, monitor the quality of the fuel mixture. Gasoline with ethanol has the property of stratifying and absorbing moisture from the air. Prepare the mixture in small quantities, designed for 2-3 weeks of active use.

⚠️ Attention! Never keep a trimmer with a full tank of gasoline in an enclosed room. Fuel vapors are toxic and fire-prone.

Regular maintenance, including cleaning the air filter, checking the candle and lubricating the gearbox, will prolong the life of your tool. Prevention It is always cheaper than a major engine repair.

Can I use a car candle in a trimmer?

No, it's strictly forbidden. Candles for two-stroke trimmer engines have a different kalyl number, thread and design. Installation of an inappropriate candle will lead to kalyl ignition, overheating and destruction of the piston group.

How often should I change the spark plug?

The candle’s resource depends on the quality of the fuel and operating conditions. On average, replacements are recommended every 100 hours or once a season when used actively. If the electrodes are burned out or the gap is not regulated, change immediately.

Why is the candle dry but the trimmer doesn't start?

A dry candle with a idle engine indicates the absence of fuel supply (filter clogged, carburetor defective) or the absence of a spark (coil failure, wire breakage). It is necessary to check the presence of a spark and the flow of gasoline into the cylinder.

What is dangerous for long-term use of a flooded candle?

Constant work on a rich mixture leads to the washing of the oil film from the walls of the cylinder, which causes bullies. In addition, unburned fuel gets into the muffler, clogging it with soda, and can damage the catalyst (if any).