Common Problems with Stihl MS 391 Chainsaws: How to Troubleshoot and Fix Them

Stihl MS 391 is a popular chainsaw among homeowners and professionals. However, like any other tool, it can develop problems over time.

This article will discuss common issues with Stihl MS 391 chainsaws and provide solutions for troubleshooting and fixing them.

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Stihl MS 391 is a powerful and reliable chainsaw that can easily handle tough jobs. However, it is not immune to problems, and users may encounter issues while using it.

In this article, we will discuss some common problems with Stihl MS 391 chainsaws and provide solutions for troubleshooting and fixing them.

1. Starting Problems

One of the most common problems with Stihl MS 391 chainsaws is difficulty starting. This can be due to various reasons, including a clogged air filter, old or contaminated fuel, a faulty spark plug, or a flooded engine.

To troubleshoot this problem, you can try the following:

  • Check the air filter and clean or replace it if necessary.
  • Drain the old fuel and replace it with fresh, clean fuel.
  • Check the spark plug and replace it if worn or faulty.
  • Clear the flooded engine by removing the spark plug and pulling the starter cord several times.

2. Overheating

Another problem that Stihl MS 391 chainsaw users may face is overheating. This can occur if the chainsaw is used for an extended period without giving it time to cool down.

Overheating can cause damage to the engine and other parts, so it is essential to address the issue promptly.

Here are some solutions for fixing an overheating chainsaw:

  • Turn off the chainsaw and let it cool down for a while.
  • Check the air filter and clean or replace it if it is clogged.
  • Ensure the engine oil level is correct and add oil if necessary.
  • Check the spark plug and replace it if it is faulty.
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3. Chain Problems

Chains are essential to any chainsaw, and their problems can affect the tool’s performance.

Common chain problems with Stihl MS 391 chainsaws include dull or damaged chains, loose or tight chains, and improper lubrication.

Here are some solutions for fixing chain problems:

  • Sharpen or replace the chain if it is dull or damaged.
  • Adjust the chain tension if it is loose or tight.
  • Ensure that the chain is adequately lubricated with chain oil.
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4. Fuel System Problems

The fuel system is another area where Stihl MS 391 chainsaws can develop problems. These problems include clogged fuel filters, leaks, and carburetor issues.

Here are some solutions for fixing fuel system problems:

  • Check the fuel filter and replace it if it is clogged.
  • Inspect the fuel lines for leaks and replace them if necessary.
  • Clean or rebuild the carburetor if it is not functioning correctly.

5. Oil Leaks

If your Stihl MS 391 chainsaw leaks oil, it can cause damage to the engine and other components. Here are some things you can check:

  • Check the oil tank cap: A loose or damaged oil tank cap can cause oil to leak out. Tighten or replace the oil tank cap if necessary.
  • Check the oil pump: A worn or damaged oil pump can cause oil to leak out. Replace the oil pump if necessary.
  • Check the oil lines: Cracked or damaged oil lines can cause oil to leak out. Replace the oil lines if necessary.

6. Chain Won’t Move

If the chain on your Stihl MS 391 chainsaw won’t move, there are several things you can check:

  • Check the chain brake: Make sure the chain brake is disengaged when using the chainsaw.
  • Check the chain tension: If the chain is too loose, it won’t move. Adjust the chain tension if necessary.
  • Check the drive sprocket: A worn or damaged drive sprocket can prevent the chain from moving. Replace the drive sprocket if necessary.
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Conclusion

Stihl MS 391 chainsaws are reliable and durable tools, but like any other tool, they can develop problems. Knowing how to troubleshoot and fix common issues with your chainsaw can ensure it stays in top condition and performs well.

If you encounter any issues with your Stihl MS 391 chainsaw that you cannot fix, it is always best to take it to a professional for repairs.

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