Owners of gasoline gardening equipment are often faced with a situation where a tool that worked successfully last season refuses to start in the spring. Chainsaw Shtil 180 is no exception: despite the high reliability of German engineering, long-term storage without proper preparation leads to a number of problems. Most often, the reason lies in a change in the properties of the fuel mixture or sticking of the piston group.
An attempt to start the engine "dry" or with an excessively rich mixture can lead to serious damage to the cylinder-piston group. Stihl MS 180 requires a careful approach, especially if it has stood motionless for more than three months. In this article we will analyze in detail the algorithm of actions that will help to revive the tool without contacting a service center.
The first thing that needs to be done before any manipulation is to visually assess the condition of the unit. Check the integrity of the housing, the absence of cracks in the tanks and the condition of the air filter. If there are no visual defects, you can begin to diagnose the systems responsible for ignition and fuel supply. Ignoring the preparatory stage often leads to the user simply “flooding” the candle even more.
Fuel system diagnostics and mixture check
The most common reason why chainsaw Stihl 180 Doesn't start after winter due to poor quality fuel. Gasoline tends to oxidize and lose its characteristics during long-term storage, especially when mixed with oil. If you have left fuel in the tank from last season, it must be completely drained. Using an old mixture is guaranteed to result in the formation of gums that will clog the carburetor jets.
After draining the old fuel, be sure to blow out the tank with compressed air or simply let it dry. It is important to check the fuel filter located inside the tank. If it looks dirty or has a sticky residue, it should be replaced. There should be no air in the fuel supply system, so inspect the fuel hoses for cracks and leaks.
Preparing a new mixture requires strict adherence to proportions. For Calm 180 the manufacturer recommends a ratio of 1:50 if branded oil is used Stihl HP Ultra, or 1:40 for oils from other manufacturers. It is critically important to use only fresh AI-92 or AI-95 gasoline with an octane number not lower than that specified in the instructions, since high-octane fuel, when stored for a long time in the saw tank, can evaporate the light fractions faster.
The correct consistency of the mixture ensures the necessary lubrication of the crankshaft and piston bearings. A lack of oil will lead to overheating, and an excess will lead to carbon deposits on the spark plug and piston. Shake the container with fuel thoroughly before refueling to ensure uniform emulsion.
Condition of the spark plug and spark system
The next step is to check the ignition system. If, after refueling with fresh fuel, the engine shows no signs of life, you need to remove the spark plug. This must be done carefully so as not to damage the threads in the cylinder head. Visual inspection of the electrode can tell a lot about the condition of the engine and the quality of combustion of the mixture.
If the spark plug is wet and has black carbon deposits, this indicates that the mixture is over-rich or there is no spark. If the electrode is dry, the problem most likely lies in a lack of fuel supply or compression. Spark plug gap for model Stihl MS 180 should be 0.5 mm. The gap is adjusted using a special feeler gauge by bending the side electrode.
- 🔥 Normal condition: Brick-brown or grayish-brown carbon deposits indicate proper engine operation.
- 🌫️ Black velvety soot: Indicates operation with a rich mixture or excess oil in gasoline.
- 💧 Wet black candle: Indicates a heavy overflow of fuel or a malfunctioning ignition.
- ⚪ White plaque: He talks about running on a lean mixture, which is dangerous due to overheating.
It is best to check the spark using a special tester or by pressing the threaded part of the spark plug against the metal of the cylinder (by pulling the starter). However, modern electronic ignition systems can produce a weak spark in air, but work reliably under pressure. Therefore, if the spark plug is visually intact and the gap is normal, but there is no spark, the ignition module or high-voltage wire may have failed.
⚠️ Warning: Never test the spark while holding a spark plug in your hand without insulating gloves. Although the voltage is not fatal, an electric shock can cause a reflexive withdrawal of the hand and injury from the sharp parts of the saw.
Air filter and carburetor: cleaning and adjustment
A dirty air filter is a common cause of difficult starting. If air flow to the carburetor is restricted, the mixture becomes too rich and the engine will choke. Remove the filter cover, remove the filter element and wash it in soapy water or blow it with compressed air. For Calm 180 You can use filters made of porous material that allow repeated washing.
Carburetor Walbro or Zama, installed on these saws, is a reliable unit, but is sensitive to dirt. If cleaning the filter and replacing the spark plug did not help, you may need to disassemble the carburetor. Pay special attention to the membranes and mesh filter. Even a microscopic speck can disrupt the functioning of the valves.
☑️ Pre-launch preparation checklist
The carburetor is adjusted using three screws: L (low speed), H (high speed) and LA (idle speed). The basic setup for starting usually involves unscrewing screws L and H 1-1.5 turns from fully tightened. Fine adjustment is carried out only on a warm engine using a tachometer, since it is difficult to determine the optimal speed by ear.
The table below shows typical problems and methods for eliminating them at the carburetor preparation stage:
| Symptom | Probable Cause | Elimination method |
|---|---|---|
| The engine does not catch | No fuel supply | Clean the jets, check the fuel filter |
| Stalls at idle | Incorrect adjustment of screw L | Smoothly rotate screw L until stable operation |
| Smokes and loses power | Excess oil in mixture | Drain fuel, prepare new mixture 1:50 |
| The candle is filled with fuel | Carburetor seal is broken | Replace gaskets, check needle |
Cold engine starting algorithm
After all the preparatory work has been completed, you can begin the launch. It is important to follow the correct sequence of actions, since Stihl chainsaw has a specific launch system. Place the saw on a flat, hard surface, making sure that the chain does not touch anything. Engage the chain brake by moving the lever to the forward position until it clicks.
Move the throttle control lever to the cold start position (usually the lowest position of the combination lever). Now you need to sharply pull the starter handle several times until the characteristic “grabbing” sound appears in the carburetor (the first flash). As soon as the engine "sneezes", move the combination lever to the half-open throttle position (middle position).
After switching mode, pull the starter again. The engine should start. Let it warm up for a few seconds at idle, then briefly press the throttle trigger. This will automatically put the saw into idle mode. If the engine stalls when trying to idle, the idle screw may need (fine tuning).
Problems with compression and piston group
If all systems are working properly, the fuel mixture is fresh, the spark is powerful, but Stihl MS 180 it still won't start or starts and immediately stalls, the problem may lie in the mechanical part. Low compression is a serious diagnosis. You can check the compression with a compression gauge or manually by plugging the spark plug hole with your finger and pulling the starter. The finger should be noticeably “knocked out” with air.
Loss of compression is often caused by worn piston rings or scoring on the cylinder. This can happen if the saw was run on a lean mixture or with poor lubrication. It is also worth checking the crankshaft seals. If they dry out over time, the engine will suck in air, which will disrupt the operation of the carburetor.
- 🔧 Seizures on the cylinder: They require boring the cylinder and installing a repair piston or replacing the entire CPG.
- 🌀 Seal wear: They are quite easy to change, but require removal of the flywheel and clutch.
- 🔩 Bearing failure: Accompanied by strong play and noise, it requires major repairs.
In some cases, after a long period of inactivity, the piston may “stick” to the cylinder. If the starter is difficult to pull or seizes, do not use excessive force. Try pouring some penetrating lubricant (such as WD-40 or kerosene) into the spark plug hole and leave it for a few hours. Sometimes this helps to move the piston without disassembling the engine.
⚠️ Attention: Operating the saw with low compression or extraneous knocking in the engine is strictly prohibited. This will lead to rapid destruction of the connecting rod and piston group and costly repairs.
Storage prevention and seasonal maintenance
To ensure that the question “how to start a saw after winter” no longer bothers you, you need to properly prepare the tool for storage. The main enemy is fuel residues in the carburetor. Before storing the saw in the garage, use up all the gas in the tank or drain it completely. Then start the engine and let it stall on its own - this will release any remaining fuel from the float chamber.
Lubricate the spark plug with a couple of drops of engine oil, tighten it and turn the crankshaft a few times. This will create an oil film that protects the cylinder from corrosion. Store chainsaw Shtil 180 better in a dry room, in a case, away from direct sunlight and heat sources.
Regular maintenance also includes lubricating the driven sprocket needle bearing. For this purpose, the design provides a special oiler. Do not forget to check the chain tension and sharpening of the teeth, since working with a dull chain creates an increased load on the engine, which is especially critical for small two-stroke engines.
Is it possible to use pure gasoline without oil for testing?
Absolutely not. Two stroke engine Stihl MS 180 does not have a crankcase oil lubrication system. Lubrication occurs precisely due to the oil added to gasoline. Starting on pure gasoline will lead to instant overheating and jamming of the piston group in a matter of seconds.
Why does the saw only start when the damper is open?
This is a classic sign of excess air being sucked in or the idle screw being adjusted incorrectly. The reason may also be a clogged idle passage in the carburetor. Requires cleaning and adjustment.
How often should the fuel filter be changed?
It is recommended to change the fuel filter mesh once a season or every time the air filter is replaced if operating conditions were dusty. The cost of the filter is low, and its clogging can damage the carburetor.