The situation when the gasoline trimmer refuses to start after a winter downtime or even during active work is familiar to many owners of garden equipment. Instead of the usual roar of the engine, you hear only silence or short, fruitless attempts to grab and stall the engine. This is annoying, especially when you need to urgently mow the grass, but do not panic - in most cases, the problem lies in simple things that can be eliminated on their own.
Gasoline engine It is a complex mechanism where the precise configuration of all systems is important: fuel supply, spark formation and compression. The failure of any of these systems leads to the trimmer It's not working. Often, owners sin on the quality of gasoline or candle, forgetting to check the air filter or the condition of the fuel mixture. Understanding the working principle of the two-stroke engine will help you quickly find the fault and return the tool to operation without an expensive visit to the service.
In this article, we will discuss the main reasons why trimmer is bad.And we'll make a step-by-step algorithm of actions. You will learn how to check the ignition system, clean the carburetor and properly prepare the fuel mixture. Competent diagnosis will save you time and money, and also prolong the life of your garden assistant.
Checking of the ignition system and candles
The first thing to do if the trimmer does not start is to check for a spark. Lack of spark is one of the most common causes of engine failure. To do this, you need to twist the candle, put a high-voltage wire cap on it and attach the metal part of the candle to the metal part of the cylinder (mass). With a sharp twitch of the starter, a bright blue spark should skip.
If there is no spark or it is weak, reddish color, the problem may lie in the very spark-plug. Carefully examine the electrode: if it is wet, black from soot or covered with oily plaque, this indicates a violation of the combustion process of fuel. In such cases, the candle is better to replace the new one, selected strictly according to the recommendations of the manufacturer of your home. gas-cots.
⚠️ Warning: When checking for a spark, never hold a candle in your hands without insulation and do not touch metal parts while scrolling the starter. High-voltage discharge can be palpable and unpleasant, although not fatal to humans.
It is also worth checking the gap between the candle electrodes. It must meet the specifications, usually a range of 0.6 to 0.7 mm. Too large or small a gap can prevent normal spark formation. If after replacing the candle spark and did not appear, perhaps failed module ignition (coil) or damaged high-voltage wire.
- 🔍 Visually inspect the candle for cracks and chips of ceramics.
- ⚡ Check the reliability of the connection of the cap and high voltage wires.
- 🧹 Clean the coar with electrodes with fine sandpaper if replacement is not possible.
Buy candles only in specialty stores, as there are many fakes on the market that fail after a few hours of operation.
Problems with the fuel system and the quality of the mixture
The second most common reason why trimmer doesn't startIt is a poor quality fuel or improperly prepared mixture. Two-stroke engines work on a mixture of gasoline and special oil. If you use pure gasoline, the engine will quickly fail due to lack of lubrication. If there is too much oil, the candle will “fill in”, and the spark will stop skipping.
It is important to remember the shelf life of the fuel mixture. Finished fuel is not recommended to be stored for longer than two weeks, since gasoline is oxidized, and oil precipitates, forming resinous deposits. These deposits are clogging. carburetor and fuel channels, which leads to difficult launch. Old gasoline loses its octane properties, which also negatively affects the engine.
If the trimmer stood idle for a long time, the old gasoline could evaporate, leaving a sticky substance in the tank and carburetor. In this case, you need to completely drain the residues, wash the tank and try to start the engine with a new portion of fresh fuel. Sometimes you need to pull the open-flip starter several times to blow the system.
Pay special attention fuel-filterThe one inside the tank. If it is clogged with dirt or sediments, gasoline simply does not enter the carburetor in the desired volume. Remove the filter through the tank hole and check its cleanliness. If necessary, replace the element or thoroughly rinse it in pure gasoline.
Carburetor malfunction and air supply
The carburetor is the heart of the fuel system, where air and gasoline mix. If Trimmer starts and dies. or does not grasp at all, possibly disturbed proportions of the mixture due to contamination of chiclera. Small particles of dirt, rust from the tank or resinous deposits of old fuel can clog the thinnest channels of the carburetor.
Removal of the defects often requires disassembly and carburettor. This is a delicate process that requires care. It is necessary to remove the device, disassemble it, blow all channels with compressed air and clean with ultrasound or special liquid. Pay special attention to membranes: if they have lost elasticity or are damaged, the carburetor will not work correctly.
| Symptoms. | Possible cause | Decision |
|---|---|---|
| The engine won't start. | Head jikler is down. | Clean the chick with thin wire |
| Trimmer's deaf on singles | Suction of air or dirt in idle jeeler | Check the leakproofness and clean |
| Increased fuel consumption | Incorrect screw adjustment | Re-adjust the carburetor |
| Black smoke from the silencer | Re-enriched mixture | Reduce the fuel supply with quality screw |
Another important detail is air-filter. If it is heavily polluted with dust and herbal flour, the engine is “choked” from lack of air. The mixture becomes too rich (lots of gasoline, little air), which prevents ignition. Remove and wash the filter regularly in soap solution or replace it if it is damaged.
Adjustment of carburetor screws
The screw L is responsible for low revs, H for high, and T (or LA) for idling. Basic setting: twist the screws L and H to the stop (not much!), then twist L to 1-1.5 revolution, and H to 1 revolution. Start the engine and warm up, then adjust the T screw for stable operation on idles.
Compression and condition of the piston group
A good compression is required to ignite the fuel mixture. If compression the cylinder is low, the mixture will not shrink to the desired pressure and temperature, and there will be no flash. You can check the compression with a special device - a compressometer, which is screwed in instead of a candle. For normal operation of the two-stroke trimmer engine, the compression must be at least 8-9 atmospheres.
Low compression can be caused by wear and tear piston-ring Or the cylinder itself. During operation, the rings are erased and cease to fit tightly to the walls of the cylinder, passing gases into the crankcase. Also, the cause may be bullies on the cylinder mirror, arising from working on a poor mixture or overheating.
Diagnose the condition of the piston group can be visually by looking into the candle hole with a flashlight. If you see deep scratches on the walls of the cylinder or back pistons, you will need a major repair – replacement of the piston group. This is a time-consuming procedure that requires skills and a special tool.
- 🔧 Check the tightness of the crankshaft coils, as their wear also leads to a drop in compression.
- 🌡️ Do not allow the engine to work with overheating, this leads to rapid wear of parts.
- 🛢️ Use quality oil for two-stroke engines with good lubrication ability.
⚠️ Note: Operation of a low-compression trimmer or bulls in the cylinder can lead to complete engine jamming and piston destruction, which will make repairs economically unfeasible.
Contamination of muffler and exhaust system
Often owners forget that the products of combustion need not only to enter the cylinder, but also to freely exit it. Silencer The trimmer will eventually become loaded, especially if you use a mixture with a lot of oil or low-grade gasoline. A clogged exhaust system creates a back pressure that prevents the cylinder from cleaning the exhaust gases.
If the trimmer starts, but immediately stalls or does not develop turns, remove the muffler and examine its insides. You can find there a dense crust of soda, completely covering the outlet hole. In some models, mufflers are collapsible, and they can be cleaned mechanically or burned out on fire.
Pay special attention to the state of sparker inside the silencer. It is a metal mesh that is often hammered first. Cleaning it with a metal brush or replacing it often solves the problem of “suffocating” the engine. Clean exhaust is the key to stable work and easy start-up.
Regular cleaning of the silencer and spark prolongs the life of the engine and provides stable power during operation.
The correct algorithm for starting a cold engine
Sometimes the problem lies not in the breakdown, but in the violation of the launch technology. Many users pull the starter too often or forget about the important stages of warming up. For a cold engine, there is a clear algorithm, the violation of which leads to a “overflow” of the candle and the impossibility of starting.
First, you need to turn on the ignition and make sure that the throttle control lever is in the correct position. Then, if there is a primer (pumping pear), press it 5-7 times to pump fuel into the carburetor. Then, transfer the air valve lever to the “Cold Start” position.
☑️ Trimmer launch algorithm
As soon as the engine "captures" (produces a characteristic sound, even if it does not start fully), immediately open the air valve. Now you need to pull the starter several more times - the engine should start and warm up at idle speeds. If you do not open the valve after the first flash, you will again fill the candle.
It is also important to take into account temperature conditions. In hot weather, the mixture evaporates faster, and the algorithm may require correction (swing the primer less). In the cold, on the contrary, more effort is required to evaporate the fuel. Compliance with manufacturer's instructions gas-cots The key to a successful start in any environment.
Why is the trimmer started only with an open flap?
This is a sign that the engine is “overflowing” with fuel. The mixture is too rich and the spark cannot ignite it. In this case, you need to twist the candle, dry the cylinder with a few scrolls of the starter, wipe the candle and try to start again with an open flap.
Can I use AI-95 gasoline?
Yes, most modern trimmers are designed for AI-92 or AI-95 gasoline. However, it is important that the gasoline is fresh. Using old fuel or fuel with an octane number below the recommended can cause detonation and damage to the piston group.
What to do if the trimmer smokes and loses power?
Heavy smoke and loss of power often indicate an improper proportion of oil in the fuel or wear of the piston group. Check the mixture, clean the muffler and carburetor. If the problem is not resolved, a replacement of piston rings is likely required.