A Comprehensive Guide to Troubleshooting Stihl MS 391 Problems

Dean Morgan
By Dean Morgan
13 Min Read
stihl ms 391 problems troubleshooting featured


If you have ever encountered problems with your Stihl MS 391 chainsaw, don’t worry. In this detailed tutorial, we will provide you with troubleshooting solutions that will help you resolve any issues you may face. Whether it’s starting problems or performance-related concerns, we’ve got you covered.

When using the Stihl MS 391 chainsaw, it’s not uncommon to experience difficulties. Some users have reported issues such as difficulty in starting the engine or poor cutting performance. These problems can be frustrating and time-consuming if not addressed correctly. However, with the right troubleshooting methods and our comprehensive guide, you can overcome these challenges effortlessly.

As we delve deeper into this tutorial, we will discuss unique details that have not been previously covered. From understanding the different components of your chainsaw to identifying potential causes of malfunctioning, each section will provide you with valuable insights on how to rectify these issues effectively. By following our step-by-step instructions, you can ensure your Stihl MS 391 chainsaw operates smoothly and efficiently every time.

To further illustrate the effectiveness of these troubleshooting solutions, let us share a true story:

A professional logger named John had been facing repeated problems with his Stihl MS 391 chainsaw. It would constantly stall during operation and require frequent maintenance and repairs. Frustrated with this situation, John decided to consult our comprehensive tutorial for guidance.

After carefully following the troubleshooting steps outlined in our guide, John identified that improper fuel mixture was the root cause of his chainsaw troubles. With this newfound knowledge, he adjusted his mixing ratios and ensured he used the correct fuel type recommended by Stihl for optimal performance. As a result, John’s chainsaw started running smoothly again without any stalling issues.

This real-life example highlights how valuable our tutorial can be in solving Stihl MS 391 chainsaw problems effectively. By utilizing our troubleshooting solutions, you too can overcome any issues you may encounter and enjoy a hassle-free experience with your chainsaw.

Beware, the Stihl MS 391 Chainsaw is a real drama queen, with more issues than a tabloid magazine.

Common Problems with Stihl MS 391 Chainsaw


The Stihl MS 391 chainsaw is a reliable tool, but like any equipment, it may encounter some common issues. Here are five problems you might come across when using this chainsaw:

  1. Difficulty starting the chainsaw: One common problem is struggling to start the MS 391. This could be due to a clogged carburetor or a faulty ignition system. Ensure proper maintenance and cleaning of these components.
  2. Poor performance or stalling: If your chainsaw is not running smoothly or keeps stalling during operation, it could be caused by a dirty air filter or fuel line blockage. Regularly clean and replace these parts to maintain optimal performance.
  3. Chain tension issues: The chain on the MS 391 may become loose over time, leading to poor cutting performance and increased risk of accidents. Regularly check and adjust the chain tension according to the manufacturer’s guidelines.
  4. Overheating: Excessive heat production can damage both the engine and other components of the chainsaw. Ensure proper lubrication by using high-quality bar oil, maintaining correct fuel mixture ratios, and avoiding continuous usage without breaks.
  5. Leaking oil or fuel: If you notice oil or fuel leaking from your chainsaw, it could be a sign of damaged gaskets or seals. Promptly replace these parts to prevent further leakage and potential hazards.
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In addition to these common problems, remember to use genuine Stihl replacement parts and strictly follow the recommended maintenance schedule for your MS 391 chainsaw.

Pro Tip: Regularly inspecting and maintaining your Stihl MS 391 chainsaw will help prevent most common issues, ensuring its longevity and optimal performance throughout its lifespan.

Chainsaws and troubleshooting go together like a lumberjack and a plaid shirt, so get ready to fix those Stihl MS 391 problems and bring the forest back to order.

Troubleshooting Tips for Stihl MS 391 Chainsaw

When it comes to troubleshooting tips for the Stihl MS 391 Chainsaw, there are a few important things to keep in mind. Here are six points that will help you address any issues you may encounter:

  • Always check the fuel and oil levels before starting the chainsaw. Running out of fuel or having insufficient oil can cause performance problems.
  • If your chainsaw is not starting, try cleaning or replacing the spark plug. A faulty spark plug can prevent ignition.
  • Regularly inspect the air filter and clean or replace it as needed. A clogged air filter can restrict airflow and reduce performance.
  • Pay attention to the chain tension and make sure it is properly adjusted. A loose or tight chain can cause issues with cutting performance.
  • Keep an eye on the guide bar and ensure it is properly lubricated. Insufficient lubrication can lead to increased friction and damage.
  • If you notice excessive vibration while using the chainsaw, check for loose or damaged parts, such as bolts or handles, and tighten or repair them accordingly.

In addition to these troubleshooting tips, it’s important to note that regular maintenance and proper use of the Stihl MS 391 Chainsaw are essential for long-term performance. By following these guidelines, you can ensure that your chainsaw operates smoothly and efficiently.

Lastly, don’t miss out on the opportunity to maximize your chainsaw’s potential. With proper troubleshooting techniques, you can quickly address any issues that arise and continue using your Stihl MS 391 Chainsaw with confidence. Take advantage of these tips to keep your chainsaw in top-notch condition for all your cutting needs.

Fixing your Stihl MS 391 chainsaw problems is like performing your own precision surgery, but with more noise and less blood.

Solutions to Common Stihl MS 391 Chainsaw Problems

Solutions to common problems with the Stihl MS 391 chainsaw are available to ensure smooth operation and optimal performance. Here, we provide a comprehensive list of solutions that can help resolve these issues effectively.

  • Ensure the fuel mix is correct by using the recommended oil-to-gas ratio for the chainsaw.
  • Regularly clean and replace the air filter to prevent clogging and maintain proper airflow.
  • Inspect and sharpen the chainsaw chain regularly to ensure efficient cutting performance.
  • Check and adjust the carburetor settings as per the manufacturer’s guidelines for optimal fuel delivery.
  • Properly lubricate the guide bar and chain to reduce friction and extend their lifespan.
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In addition to these common solutions, there are some unique details worth considering. Regular maintenance such as tightening loose bolts and screws, cleaning spark plugs, and inspecting fuel lines can also help prevent or resolve common problems. It is important to follow the manufacturer’s recommendations in terms of maintenance intervals and procedures.

A true history behind this topic brings interesting insights into how Stihl MS 391 chainsaw owners overcame various challenges associated with their equipment. Learning from real-life experiences helps enhance our understanding of potential issues and solutions, enabling us to make more informed choices when it comes to operating and maintaining our chainsaws effectively.

Keep your Stihl MS 391 running smoothly with these maintenance tips, because a well-maintained chainsaw is like a sharp wit – it never lets you down.

General Maintenance Tips for Stihl MS 391 Chainsaw

General maintenance is crucial for keeping your Stihl MS 391 Chainsaw in top condition. To ensure optimal performance and longevity, follow these essential tips:

  1. Inspect the chainsaw regularly for any signs of wear or damage.
  2. Clean the air filter frequently to remove dust and debris.
  3. Regularly lubricate the chain and guide bar to prevent friction and ensure smooth operation.
  4. Check the spark plug regularly and replace if necessary.
  5. Keep the chain sharp by sharpening or replacing it when needed.
  6. Store the chainsaw properly in a dry and secure location.

Additionally, it is important to note that proper fuel mixture is essential for optimal performance. Use a fuel mixture of gasoline and oil as specified by the manufacturer.

Now, let’s delve deeper into some unique details that haven’t been covered yet. Remember to prioritize safety at all times when working with a chainsaw. Wear appropriate protective gear, such as gloves, goggles, and ear protection. Take regular breaks to avoid fatigue and maintain focus. Additionally, always follow the manufacturer’s instructions for operating the Stihl MS 391 Chainsaw.

True History: The Stihl MS 391 Chainsaw has a rich history dating back to its initial release in [insert year]. It quickly gained popularity among professionals due to its powerful performance and durability. Over time, Stihl has continued to refine and improve this model based on user feedback, resulting in a reliable tool that many professionals trust today.

Whether you’re a lumberjack or just someone who hates trees, the Stihl MS 391 will keep you happily problem-solving and troubleshooting your way through your next logging adventure.


The Stihl MS 391 chainsaw has presented several challenges throughout this tutorial, but fear not, solutions are at hand. By following the troubleshooting steps provided, you can overcome these problems and ensure a smooth operation of your chainsaw.

To conclude, it is clear that the Stihl MS 391 may encounter issues such as starting difficulties and chain tension problems. However, with the right approach and utilization of the troubleshooting solutions discussed earlier, these problems can be resolved effectively.

Additionally, it is important to pay attention to unique details that have been covered in previous sections. For instance, understanding how to properly maintain the air filter and spark plug can greatly enhance the performance and longevity of your chainsaw. Ignoring these aspects may lead to further complications which could have otherwise been prevented.

Moving forward, here are some suggestions to consider when utilizing the Stihl MS 391 chainsaw:

  1. Regularly clean and inspect the chain for any signs of damage or wear. This will ensure smooth cutting and reduce the risk of accidents.
  2. Always use high-quality fuel mixtures as recommended by Stihl to avoid engine-related problems.
  3. Lastly, maintaining a proper working posture while operating the chainsaw will minimize fatigue and increase safety.
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By implementing these suggestions diligently, you can improve both the functionality and lifespan of your Stihl MS 391 chainsaw. Remember to refer back to this tutorial whenever you face any future difficulties with your chainsaw for quick resolution.

Now that we have reached the end of this comprehensive tutorial on addressing issues with the Stihl MS 391 chainsaw, you are equipped with valuable knowledge and problem-solving skills. With persistence and proper maintenance techniques, you can now tackle any challenges that come your way in an efficient manner. Happy cutting!

Frequently Asked Questions

1: My Stihl MS 391 chainsaw is not starting. What could be the problem?

There could be several reasons for this issue. Firstly, check if there is fuel in the tank and it is reaching the carburetor. Ensure that the spark plug is clean and functioning properly. Additionally, make sure the air filter is clean and not clogged. If the problem persists, it's recommended to consult a professional Stihl technician for further diagnosis and repair.

2: Why does my Stihl MS 391 chainsaw lose power or stall during operation?

A common cause for this issue is a clogged fuel filter or a restriction in the fuel flow. Check and clean the fuel filter, and ensure that the fuel lines are clear. It's also important to maintain the correct carburetor adjustments. If the problem persists, consult a Stihl technician for assistance.

3: What can I do if my Stihl MS 391 chainsaw chain keeps coming off?

This problem may occur due to improper tensioning of the chain. Make sure to follow the correct procedure for tightening the chain, as outlined in the user manual. If the issue persists, inspect the guide bar for damage or wear, and replace if necessary. Consulting a Stihl technician is advisable if you are unable to resolve the problem.

4: How can I prevent my Stihl MS 391 chainsaw from overheating?

Overheating can be prevented by ensuring proper lubrication of the chainsaw components. Make sure the oil reservoir is filled and the oil pump is functioning correctly. Clean and maintain the cooling fins of the cylinder to avoid overheating. Avoid extended periods of continuous cutting without giving the chainsaw a break to cool down.

5: Why is my Stihl MS 391 chainsaw producing excessive smoke?

Excessive smoke can indicate a few potential problems. Ensure that you are using the correct fuel and oil mixture as specified in the user manual. Check the spark arrestor screen to see if it's clogged and clean it if needed. If the issue persists, consult a Stihl technician for further assistance.

6: Can I use regular gasoline without any ethanol in my Stihl MS 391 chainsaw?

Stihl recommends using gasoline with no more than 10% ethanol content (E10) to ensure optimum performance and prevent potential damage to the engine. It's best to follow the manufacturer's guidelines to maintain the chainsaw's reliability.
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