How to check the STIHL 180 ignition coil

The starter device

Often, chainsaw manufacturers equip their units with starters that work on almost the same principle, namely: in the groove of the saw housing there is a handle, through which a cord is passed. When the handle is suddenly lifted, the cord is pulled through, which engages the drum of the ratchet mechanism. In this way, the ratchet drum, which is located on the shaft, is actuated. At this time, the crankshaft makes several revolutions, resulting in compression of the fuel mixture, which at this point is between the cylinder head and the piston. When the handle is lowered, on the contrary, the ratchet and pins lose their contact, which causes the shaft to stop.

Design and principle of chain saw starter

Increasing the power of the chainsaw increases the amount of fuel mixture, which must ignite when starting the chainsaw. In this case, to start the engine it is necessary to increase the number of jerks of the starter cord. To accelerate the return of the drum mechanism, manufacturers use a special steel starter return spring, which has excellent elasticity.

Chainsaw starter spring

If the spring is broken, it is necessary to: remove the mechanism cage, pull out the spring, fixing the upper part of it with your finger and pulling the starter handle a little to the side. Then, wind a new part, avoiding kinking and twisting the new spring element, then carefully fix the cage.

The starter gears

Often, chainsaw manufacturers equip their units with starters that work on basically the same principle, namely, there is a handle in the groove of the saw housing, through which a cord is passed. When the handle is raised sharply, the cord is also pulled, causing the ratchet drum to engage. This is how the sprocket assembly on the shaft works. At this time, the crankshaft makes several revolutions, causing the fuel mixture to compress and at this moment it is between the cylinder head and the piston. When you lower the handle, on the contrary, the ratchet and the studs lose their contact, which causes the shaft to stop.

Possible problems

If the chain saw fails to start, the first thing to check is the spark plug which ignites the fuel in the barrel. Begin by removing the high voltage lead to which the spark plug is connected. Then unscrew the spark plug itself from the cylinder head and examine its condition. The spark plug should be dry when working properly and there should be a small deposit on the ceramic of a light color:

Stihl Ignition Coil Bench Test and Replacement

  • If the spark plug is wet, there is a problem with the carburetor. You need to adjust and set the fuel level in it;
  • Dark or black soot on the spark plug surface indicates a problem with the piston group.
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If there is no visible cause, the spark plug is dry and the soot is light, go back the other way. Since this is the final point of ignition of the mixture. Now check to see if the spark is coming to the spark plug. This is the ignition system unit.

Adjusting the carburetor on the STIHL chain saw 180.

There is only one screw to adjust the carburetor on the STIHL 180 chain saw. the idle speed adjustment screw. 1. Standard idle speed adjustment (abbreviated to x).х.): turn screw counterclockwise until it is no longer tight, then make two revolutions clockwise and that’s it. 2. If the rpm is too low x.х., then it is necessary to turn the screw clockwise until the chain starts to move, and then turn the screw 0.5 turn counterclockwise. 3. If the rpm is too high x.х., If you have a problem with an ignition module, turn the screw counterclockwise until the chain stops turning, and then turn the screw another 0.5 turns counterclockwise.

That’s it. carburetor adjustment on the STIHL 180 chain saw is over.

Troubleshooting chainsaw ignition modules

Quite often it is the ignition modules and coils that cause problems when starting chainsaws. The main symptom of a faulty carburetor is no spark. All you can do is replace the suspect module with a guaranteed good. If you still can’t get a spark after that, there may be another reason why you’re looking for it.

Replacing the module with one that is guaranteed to be working is the most reliable way to check if it is working. All other methods are not a 100% guarantee.

Another sign of failure of the ignition module or its coil is a weakening of the spark, which simply does not have enough power to start the engine. This happens at the moment when the chainsaw is heated up in the process of intensive work. Once the ignition coil control system transistor is heated, its resistance increases dramatically and the spark strength drops. Because the malfunction only shows up when the saw is hot, it’s hard to prove the malfunction to the salesperson when trying to return the saw to the store.

Chainsaw ignition system parts replacement

Some early electronic ignition systems consisted of two parts. the ignition module and the ignition coil. Today they are combined in one part. On saws with dual ignition systems, the trigger module can be replaced without replacing the coil. This is an easy job, as the trigger is usually installed with a couple of screws. When replacing this part, simply remove the old module and install the new module in its place. Just make sure that the new module has a good base. If you notice any corrosion on the mounting connections or if the screws were not tight, this could be your ignition problem. The modules should be well connected.

Replacing the coil is a little more difficult. The ignition coil is mounted in the fan housing next to the flywheel. The module in contact with the magneto field of the flywheel, produces energy for the spark and contains a link to the ignition advance. When replacing the coil, remove the old coil and inspect it. Look for damage from contact with the flywheel. Contact between the coil and flywheel can be caused by loose mounting screws or worn crankshaft main bearing.

Even if you don’t see any damage, check the crankshaft bearing. If you feel movement and play in this bearing, replace the bearing. Also inspect the flywheel. If everything looks good, install the new coil. The base of the coil should be set about 1. 1.5mm above the magnets on the flywheel. If you don’t have blades, try using a business card or a piece of cigarette packet as a spacer. Turn the flywheel so that the magnets face the coil. With gasket in place, tighten spool mounting screws remove gasket.

When replacing the spool, the clearance must be set perfectly to ensure that the flywheel does not touch the spool at any point in its rotation. Also do not use thick cardboard or thick paper, the clearance must be appropriate, pay special attention to this.

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Repair oil system

If there is no oil supply to the chain, you must diagnose the entire system and determine the reason for the lack of oil. There may be several main reasons:

  • Clogged oil filter or oil system;
  • Lack of threading on the worm gear of the oil pump;
  • Clogging or malfunction of the pump itself;
  • The oil system is leaking (there will be oil leaks on the bottom of the chain saw).

To check the threads on the oil pump worm drive, you will need to remove the chainsaw’s drive sprocket and unscrew the clutch. To do this, the spark plug is unscrewed and the piston stopper is installed in its place, thereby ensuring that the crankshaft of the tool is securely secured from turning.

Then the guide bar cover on the STIHL 180 chain saw is removed and the circlip that holds the chain sprocket is removed with a screwdriver.

check, stihl, ignition, coil

How to set the ignition on a chainsaw?

As in the case with the constant need to adjust the carburetor itself, used in a private household or on the shaft of the forest, chainsaw must lend itself to the timely adjustment of the built-in regular ignition. The essence of this procedure is to set the gap originally provided between the flywheel of the power unit and the OEM ignition coil. The size of this gap may initially be different. it all depends on the purpose, as well as the design features of the saw. Average is considered to be a distance equal to not less than 0.2 and not more than 0.4 mm. If the correct gap is breached, the basic ignition system will not be able to generate the spark required for the timely instantaneous ignition of the primed fuel mixture.

To initially properly adjust the proper clearance between the flywheel and the ignition coil on a chainsaw, its owner will need a special plate template. However, it is not always advantageous to buy it for a single use. In some cases, the template may be replaced with a homemade one. To make one, the operator needs a smooth plastic bottle, from the side of which a thin strip must be cut out. There should be no embossing on the homemade template.

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The operator can adjust the ignition on the chainsaw directly in this order:

  • First, it is necessary to slightly loosen the plastic bolts designed to fix the element of the regular ignition;
  • Next, the magnets provided on the flywheel will need to be brought up to the factory coil;
  • Then between the base high-voltage coil and the built-in engine flywheel you need to install a homemade or previously purchased template. After that, the bolts fixing the coil will need to be screwed in the opposite direction;
  • The operator must then carefully remove the guide bar from the saw.
  • At the end you need to rotate the built-in handwheel. At the same time you need to make sure that when rotating the element does not touch the coil and other parts of the chainsaw.

If, for some reason, the adjustment of the ignition of the chainsaw led to a permanent contact of the flywheel, then you need to inspect the reinforcements that fix it in its normal place. If they are deformed, the fasteners will need to be replaced.

STIHL 180 chain saw ignition adjustment

STIHL chain saw MS 180 is mainly used for cutting wood and other construction site work. STIHL 180. Adjusting the ignition of the STIHL 180 chain saw. STIHL 180, video. Similar equipment is very often used because of its long list of functions and features. The main feature of such a model is reduced vibration, which is very vital. Of course, chain saw malfunctions during use, which means that it needs to be repaired.

Problems with the carburetor

A feature of the STIHL chain saw carburetor is the presence of a single screw that is responsible for adjusting the idle speed. Always pay attention to idle speed when operating the machine. A few simple steps will help to adjust it: check the air filter, as well as the spark screen.

It is worth noting that repairing the carburetor of STIHL chain saws is considered a labor-intensive process. This article takes an in-depth look at the spark plug adjustment for the STIHL 180 chain saw. If for some reason it stops starting, you need to do the following:

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  • Adjusting the carburetor of a STIHL 180 chain saw
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