Stihl chainsaw owners often face a situation where a reliable tool suddenly stops holding its momentum. The situation when Style 180 starts and stops.It can be caught by surprise right during the rolling of wood or wood harvesting. The engine starts, emits a characteristic sound, but immediately loses power and stops. This is a classic symptom of a malfunction of the fuel supply or ignition system, requiring immediate intervention.
In most cases, the problem lies not in the breakdown of the engine itself, but in a banal blockage or violation of adjustments. Chainsaw Stile 180 - reliable unit, but it requires high-quality fuel and cleanliness in the fuel system. Ignoring the first signs of unstable operation can lead to more serious consequences, such as piston group bullies. In this article, we will discuss the main reasons why the tool is deaf on idles or under load.
Before disassembling the carburetor, it is necessary to exclude the simplest factors. Often users forget that the quality of gasoline and oil is crucial. The old fuel mixture, which has stood in the tank for more than two weeks, loses its properties and can cause the saw to stop working normally. It is also worth checking whether the air filter is clogged, since the lack of air disrupts the mixture.
Quality check of fuel mixture and supply system
The first thing to do is if Chainsaw Stile 180 is stalled Immediately after launch, it is to assess the state of the fuel. Two-stroke engines are extremely sensitive to the octane number of gasoline and the quality of the oil. If you use a mixture that has been in the tank for more than a month, it must be completely drained. Oxidized gasoline forms resinous deposits that clog the jelly.
It is important to maintain the correct mixing proportion. For modern Stihl saws, a ratio of 1:50 is usually recommended, however, for older models or when using certain oils, this may differ. Violation of proportion in the direction of increasing the amount of oil leads to soak on the candle and piston. If there is little oil, there is overheating and jamming.
Check the fuel filter inside the tank. It is a small cylinder on the end of the hose. If it is blackened or covered with mucus, the fuel does not come in the required amount, and the engine stalls under load. Also, check the fuel hose itself: it should not have cracks through which air can be sucked.
- 🛢️ Pour the old fuel and pour a fresh mixture of AI-92/95 gasoline and high-quality two-stroke oil.
- 🔍 Remove the fuel filter through the neck of the tank and rinse it in pure gasoline or replace it.
- 🔌 Check the integrity of the fuel hoses and the density of their landing on the carburetor connections.
⚠️ Warning: Never leave a chainsaw full of tank for long-term storage (more than 3-4 weeks). The fuel evaporates, leaving an oily sediment, which turns into an adhesive substance that blocks the carburetor.
Diagnostics and cleaning of air filter
Air filter pollution is one of the most common reasons why Stihl MS 180 It starts and dies. Dust, wood sawdust and fine shavings quickly clog the pores of the filter element. The engine starts to “choke”, getting too rich mixture (lots of gasoline, little air), which leads to a stop.
The verification process is simple: remove the air filter cover by unscrewing the fixing nuts or latches. Visually assess the condition of the element. If it is gray or black from dust, it must be cleaned. To do this, it is enough to gently knock out the filter or rinse it in soapy water, but only after a thorough drying (at least 24 hours) you can put it back.
However, if the filter is torn or severely deformed, cleaning will not help – replacement is required. Working with a damaged filter is equivalent to no filter at all: abrasive dust will get into the cylinder, which will lead to rapid wear of the piston group and loss of compression.
In addition to the filter, check the air supply channels. Sometimes they are stuffed with compressed dust, which is difficult to see without a flashlight. Blowing the channels with compressed air or using a soft brush will help restore normal circulation.
Failures of spark plugs and electricians
If the fuel and air are all right, attention is switched to the ignition system. Ignition candle It is an indicator of engine health. Turn it off and examine the electrode carefully. The color of the soda will tell you a lot: black and wet plaque indicates a re-enriched mixture, whitish or melted electrode - overheating or poor mixture.
The gap between the electrodes also matters. For the saws of Style, it is usually 0.5 mm. If the gap is too large, the spark will be weak or disappear under load. Check for a spark by putting a candle to the metal part of the cylinder (making sure your hands are dry) and yanking the starter. A bright blue spark indicates the serviceability of the coil and wire.
Do not forget about the tightness of the candle channel. If water or dirt enters the depression where the candle is located, the spark breaks down on the mass. Before installing the candle, blow the well with compressed air. Also check the high-voltage wire: it should sit tightly on the candle and not have damage to the insulation.
| Candle condition | Probable cause | Action |
|---|---|---|
| Black, wet plaque | Excess oil, poor quality of mixture | Replace the mixture, clean the candle |
| White plaque, melting. | Poor mix, overheating | Check the carburetor, air filter |
| Brick-brown | Normal work. | Continue operation |
| Oily plaque | CNG wear, oil combustion | Measure compression, engine repair |
Adjustment and cleaning of the carburetor
The carburetor is the heart of the fuel system. If Style 180 is dead on singles or when pressing the gas, most likely, its setting is broken or the jellyfish clogged. Modern saws often have carburetors with adjusting screw limiters, but basic settings are available.
The main screws of adjustment: L (Low) - low revs, H (High) - high revs, LA (or T) - idling. If the saw stalls when releasing gas, you need to twist the idle screw (LA) clockwise to increase the supply of the mixture at a minimum. However, if the carburetor is contaminated, adjustments will not help - you need disassembly and cleaning.
☑️ Cleaning the carburettor
When cleaning the carburetor, pay special attention to the mesh filter-bar and needle valve. Even a microscopic motley can disrupt the entire node. Use special cleaners for carburetors and blow all channels with compressed air. After assembly, re-adjustment of the turns may be required.
⚠️ Note: Do not twist the L and H screws without the need or tachometer. Incorrect setting of the screw H (maximum revs) can lead to the engine working on too poor mixture, which will cause overheating and piston bullying in a matter of minutes.
Problems with the tank sapuna and tightness
Often the reason that the saw starts, works for several minutes and dies, lies in a vacuum plug in the fuel tank. Behind the lid of the gas tank is a sapun (valve), which equalizes the pressure. If it is clogged, a vacuum is created in the tank, and the fuel ceases to flow into the carburetor.
It is easy to test this hypothesis: when the saw stalls, try to gently open the lid of the tank. If you hear the characteristic sound of air suction ("psh"), then the problem is in the sapuna. It must be cleaned with thin wire or blown with compressed air.
Also check the tightness of the engine crankcase. Suction of excess air through the crankshaft coils or the gasket between the carburetor and the cylinder violates the composition of the mixture. The engine begins to work unstable, the turns float, and the saw dies. For diagnosis, you can use a special device - an airbrush, which pumps air into the cylinder and checks the pressure drop.
- 🌬️ Check the valve in the tank cover for dust clogging.
- 🔧 Check the intake manifold for cracks.
- 🧪 Conduct a test for tightness of the crankcase (pressure) if you suspect wear of glands.
Silencer and exhaust system
A smeared smother is another reason why chainsaw It loses power and it dies. The products of combustion of oil and gasoline are deposited on the walls of the exhaust channel and in the spark. Over time, the passage section decreases, the exhaust gases cannot escape, and the engine is "pressed".
Remove the muffler and inspect the cylinder outlet. If smoke is coming from the cylinder or traces of sodium are visible, the muffler requires cleaning. The metal mesh of the sparker can be burned out with a blowtorch or soaked in aggressive chemistry, but it is often easier to replace the knot entirely.
Can I see without a silencer?
Technically, you can run a saw without a muffler, but it is not recommended to do this. First of all, it's very noisy. Secondly, the resonance of the exhaust changes, which can knock down the settings of the carburetor. Third, the sparks from the exhaust can cause a fire. Use this method only for short-term diagnosis.
Pay attention to the condition of the cylinder exhaust window. If the piston is worn out or poor-quality oil is used, the window can overgrow with coke, which will also make it difficult to get gases out. Cleaning the window requires removing the cylinder and carefully removing the coar without damaging the mirror surface.
Compression and mechanical damage
If all of the above systems are serviceable, and the saw still does not hold speed, it is worth measuring the compression. Low compression (less than 8 atmospheres) indicates serious wear of the piston group: rings, cylinder or piston. In this case, the engine cannot create enough pressure for the mixture to burn normally.
The cause of the compression drop may be damage to the crankshaft coils. The oil from the crankcase begins to be sucked into the combustion chamber, the candle overgrown with soda, and the saw dies. Diagnosis of the oil seals is possible only with a complete disassembly of the engine.
When buying a used chainsaw, always check the compression. Twisted the candle, insert the compressometer and sharply pull the starter. If the arrow does not rise above 6-7 atmospheres, the engine requires major repairs.
Also check the condition of the crankshaft bearings. Luft in bearings leads to the beating of the shaft, the destruction of the glands and the loss of tightness of the crankcase. This is a complex malfunction requiring professional repair using a special skipper.
Diagnostic sequence: 1. Fuel and filter, 2. Candle, 3. Sapoon tank, 4. Carburetor, 5. Silencer, 6. Compression. Go from simple to complex.
Prevention and proper start-up
To avoid the situation where Style 180 starts and stops.It is important to follow the rules of operation. Always use a fresh fuel mixture, store the saw in a dry place and clean the air filter regularly. Proper start-up also affects durability: don’t keep the saw long at maximum revs without loading.
Before starting work, warm up the tool for 30-60 seconds on idling. This will allow the oil to be evenly distributed across the nodes of friction. If the saw was working in intensive mode, let it work on blanks before turning off to avoid heat stroke.
Regularly inspect the tool for fuel and oil leaks. Timely detection of a minor malfunction, such as a cracked hose or a weakened carburetor mount bolt, will save you from expensive repairs in the future. Careful attitude to technology is the key to its long service.
Why does Style 180 stop when you press the gas?
Most often, this indicates improper tuning of the L screw (low revs) or contamination of the idle jeeler. Also, the cause may be in the air suction through the gasket of the intake manifold. The engine does not receive sufficient enrichment of the mixture with a sharp opening of the throttle.
How long should a saw work at idle?
The optimal time of idling is no more than 10-15 seconds. Long-term work without a load leads to overheating of the engine, since the cooling air flow from the flywheel is insufficient, and the fuel mixture is too poor for effective cooling. It could cause piston bullies.
What to do if the saw starts only with a closed valve?
This is a clear sign that the carburetor is not supplying enough fuel in running mode. Possible causes: clogged fuel filter, clogged jelly carburetor, or disturbed adjustment of the screw L. It is also worth checking the tightness of fuel hoses.
Can I use AI-92 gasoline for Style 180?
Yes, for chainsaws Stihl is recommended to use gasoline with an octane number of at least 90-92. The use of fuel with a higher octane number (AI-95, AI-98) is allowed, but does not give advantages, and sometimes can lead to more rigid engine operation. The main thing is the freshness of the fuel.
How often should the fuel filter be changed?
The fuel filter is recommended to be changed every season or when signs of contamination appear (saw stops developing speeds). If you work in very dusty conditions or use fuel of dubious quality, the replacement should be carried out more often - once in 2-3 refueling tanks of large volume.