Chainsaw launch Stihl MS 180 This is the first and most important stage of work, on which not only the efficiency of sawing depends, but also the engine life. Many users face difficulties in cold start, not knowing about the intricacies of the two-stroke engine and the fuel supply system. The wrong sequence of actions often leads to a “drenched” candle or the inability to turn the crankshaft.
In this article, we will analyze a detailed algorithm of actions that will allow you to confidently run the tool in all weather conditions. You will learn how to properly manipulate the valve lever and why decompression-valve (If there is a modification) greatly facilitates the jerk of the starter. Also, let’s look at the typical mistakes of beginners.
Before pulling the starter, you need to make sure that there is a fuel mixture. For Style 180 A mixture of AI-92 gasoline and a special two-stroke oil in a ratio of 1:50 is required. Using pure gasoline or incorrect proportions can quickly disable the piston group. Always check the fuel level before starting work.
Preparation of the instrument for the first launch
The initial preparation takes only a few minutes, but ignoring this stage is fraught with problems. Install a saw headset: a tire and a chain. The chain must be stretched correctly - it should not sag, but also pull it over. categorically. When heated, the metal expands, and weak tension can cause the chain to jump off the tire.
Check the air filter status. If the saw was used before, the filter could be clogged with sawdust. The dirty filter disrupts the proportion of the fuel-air mixture, making the launch impossible or extremely difficult. Remove the filter cover, remove the element and, if necessary, blow it with compressed air or rinse in soapy water.
Pay special attention to the fuel tank. Make sure the lid is tightly closed and the tank itself is filled with fresh mixture. Old fuel, which has stood for more than two weeks, loses its properties and may contain oxides that clog the jelly carburetor.
☑️ Preparation for launch
Visual inspection of the body for cracks and integrity of the starter cable will also not be superfluous. Mechanical damage can lead to depressurization of the crankcase, which will make the engine impossible.
Algorithm of cold start of the engine
Cold start is the most complex procedure, requiring strict adherence to the sequence. Place the saw on a flat, hard surface. Make sure the saw chain does not touch the ground, branches or other items. The brakes on the chain The lever in the forward position shall be switched on for the safety of the operator.
Press the decompression valve (if the model is equipped with a decompression button) to reduce the resistance on the first jerk. Then move the combined control lever to the cold start position (top position). In this position, the throttle overlaps, creating a rich mixture for the start.
⚠️ Warning: Do not press the trigger on a cold start! The control lever will fix the desired position of the throttle itself. Pressing the trigger will knock the settings of the valve and fill the candle.
Take your left hand for the front handle, pressing the saw with your foot to the ground. With your right hand, smoothly pull the starter handle until you feel resistance, then make a sharp, strong jerk. The engine must be "snatched" and shut down. It's a signal that the fuel has entered the cylinder.
After the first flash, move the combined lever to the middle position (semi-open flap). Pull the starter again. The engine should start and run at higher speeds. Press and release the gas trigger - the saw will go to idle mode.
Starting the hot saw and restarting
If the engine was already in operation and warmed up, the start procedure is greatly simplified. In this case, you do not need to transfer the lever to the cold start position. It is enough to transfer the combined lever to the middle position (or the "hot start" position, if it is highlighted separately in your modification).
During hot start, the mixture should be less enriched, since the evaporation of fuel in the heated crankcase is higher. Excessive enrichment will cause the spark to fail to penetrate the wet electrode of the candle. Therefore, the main rule of a hot start is to minimize the supply of fuel.
Make some jerks as a starter. If the saw doesn't start, it may have "choked." In this case, twist the candle, dry the cylinder with a few scrolls of the starter (with an open combustion chamber) and screw the candle back. Try to start again without swap.
If the saw stood for 10-15 minutes, it is considered conditionally hot. If you have a few hours, use the cold start algorithm.
If after several attempts of hot start the saw does not start, try to fully open the air valve (position of work) and pump the starter 5-7 times to blow the cylinder from excess fuel.
Adjusting the carburetor: when necessary
chainsaw Stihl MS 180 It is equipped with a carburetor with limited access to adjustments. On many models only screws are available. L (Low) and H (High)idling (LA or T) may be hidden or require a special key. Adjustment is necessary if the saw stalls on idle, smokes or does not develop power.
Before the start of adjustments, the engine should be warmed up. The screw L is responsible for the quality of the mixture at low revs, H - at high. Factory settings are usually optimal, but changing altitude or fuel composition may require adjustments. Turn the screws clockwise to deplete the mixture (less fuel), against - for enrichment.
| Vint | Function | Symptoms of improper setting | Direction of correction |
|---|---|---|---|
| L (Low) | Low speed/acceleration | Failures when pressing gas, deaf on singles | Against the sentinel (enrich) |
| H (High) | High RPM/power | Overheating, scorching on a candle, black smoke | By the hour (dining) |
| LA / T | Idle move | The chain is spinning on singles or the saw is deaf | Adjustment of engine speed |
Be careful with the H screw. Too poor mixture at high revs can lead to overheating of the piston and bullies. If you are not sure of your actions, it is better to leave factory settings or contact the service.
The secret of factory screw tuning
On newer saws, the L and H screws often have plastic power limiters that prevent them from being unscrewed completely. This is done to protect the engine by beginners. Power users sometimes remove these limiters to fine tune for a specific fuel.
Typical startup problems and their solution
One of the most frequent problems is candle-drench. This happens when too much fuel enters the cylinder and the spark cannot ignite it. Symptoms: the smell of gasoline from the silencer, wet candle electrodes, no flashes when scrolling.
To solve the problem, twist the candle, wipe it with dry rags and dry it. Blow through the candle channel by pulling the starter several times with the candle twisted (this will remove excess gasoline from the cylinder). Roll the candle back in and try to start the saw in hot start mode (without closing the air damper).
Another reason for the rejection is the lack of spark. Check the candle by applying it with a thread to the metal of the cylinder and yanking the starter. If there is no spark, the problem may be in the ignition coil, the wire contact, or the candle itself. Also check if you have closed. contact-wire on the mass due to damage to the insulation.
⚠️ Warning: Never leave a working saw unattended. Even when idling, the chain can start moving when the clutch malfunctions, which will lead to injuries.
If the starter spins too lightly as a idle one, it may have cut the slits on the ratchet or the cable has broken. In this case, it is necessary to disassemble the starter mechanism and replace worn parts.
Safety Techniques When Working with Chainsaw
Safety is the number one priority. Always work in protective gear: glasses, gloves, headphones and special shoes. Backlash - a sharp throw of the saw up when the toe hits the tire on the obstacle - can cause serious injuries.
Hold the saw firmly with both hands, clasping the handles with your fingers. The left thumb should be under the front handle. This position allows you to control the tool even with a strong vibration or jerk.
Do not work with a saw above shoulder level and do not saw the end of the tire unless there is an urgent need for this. Keep an eye on your surroundings: Make sure there are no people, animals or objects nearby that may fall off after oversawing.
Regular sharpening of the chain reduces the load on the engine and the risk of backlash. A dull chain requires more effort and crashes worse into wood.
After work, let the saw cool before putting it in the case or garage. A hot engine can cause fire when in contact with flammable materials.
Why does the saw stop when you press the gas?
Most often, this indicates clogging of the fuel filter in the tank, contamination of the air filter or improper setting of the L screw. Also, the cause may be the sucking of air through the coils of the crankshaft.
Which oil is best used for Style 180?
The best choice is the original oils. Stihl HP or HP Ultra. They provide better lubrication and burn with minimal amount of sodium. It is acceptable to use analogues of the JASO FB or FC class.
Can I start a saw without an air filter?
A short run to check is acceptable, but long-term operation without a filter will lead to the entry of abrasive dust into the cylinder, which will cause rapid wear of the piston group.
What if the starter is jammed?
Don't put too much effort into it. Remove the starter lid and check the mechanism. Often, the wedge is caused by a break in the cable or a rutting of the forklift. In some cases, engine jamming means a serious breakdown inside the motor (bobbers, wedge bearings).