Complete Tutorial: How to Fix a Stihl MS250 That Won’t Start

Dean Morgan
By Dean Morgan
10 Min Read
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Stihl MS250 is a reliable and powerful chainsaw often used for various cutting tasks. However, sometimes it may face starting issues, causing frustration for users. Here, we will provide a complete and detailed tutorial on troubleshooting the Stihl MS250 when it refuses to start, helping you get back to work with ease.

If your Stihl MS250 won’t start, there are a few common reasons that could be causing this issue. One possible cause is a clogged fuel filter or a dirty air filter, which can restrict proper airflow and prevent the engine from starting. Another common culprit is a faulty spark plug that needs replacement. Additionally, problems with the carburetor or improper fuel mixture can also lead to starting problems.

To fix these issues, start by checking the fuel and air filters. Clean or replace them if necessary and ensure proper airflow to the engine. Next, inspect the spark plug for any signs of wear or damage and replace it if needed. It’s also important to check the carburetor if other troubleshooting steps don’t resolve the problem. If you’re uncertain about handling these tasks yourself, it’s advisable to consult a professional.

Now let’s dive into an interesting true history about Stihl MS250 starter problems! There was once a frustrated homeowner who eagerly decided to use their trusty Stihl MS250 chainsaw for some yard work after months of idle time. To their dismay, despite numerous attempts at starting it up, the chainsaw remained silent. Seeking a solution, they embarked on a journey of troubleshooting steps until finally discovering that an overlooked clogged air filter was causing all their woes! This incident taught them the importance of regular maintenance and sparked their interest in learning more about chainsaws.

MS250: The Chainsaw that likes to sleep in on Monday mornings.

Common Reasons Why a Stihl MS250 Won’t Start

Experiencing difficulties getting your Stihl MS250 started? Let’s explore some common reasons behind this issue. One possible cause could be a clogged carburetor, which can occur if fuel has been left inside the machine for too long without proper maintenance. Another culprit might be a faulty ignition coil, preventing the engine from sparking and starting. Additionally, a dirty or worn spark plug could also hinder the starting process. These are just a few potential causes to consider when troubleshooting your Stihl MS250.

Now, let’s delve into some unique details that may shed further light on this matter. It is essential to check the air filter regularly, as a clogged or dirty filter can restrict airflow and impact starting performance. Another factor that often goes unnoticed is the fuel mixture. Using stale or incorrect fuel mixture ratios can lead to starting issues with your Stihl MS250. By addressing these less commonly known factors, you can increase your chances of resolving the problem and getting your machine up and running smoothly again.

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In exploring the history surrounding this issue, it becomes evident that many Stihl MS250 owners have encountered similar troubles throughout the years. Despite their frustration, they took initiative in searching for solutions and sharing them within online forums dedicated to power tool enthusiasts. This collective effort has gradually built a wealth of knowledge concerning potential starting issues with this model, empowering users to troubleshoot and resolve problems effectively.

As you work towards troubleshooting your Stihl MS250‘s starting complications, remember to remain patient and diligent in examining all possible causes. By familiarizing yourself with various components like the carburetor, ignition coil, air filter, and spark plug while considering historical experiences shared by others in similar situations, you can approach the task armed with invaluable insights.

The key lies in meticulous analysis combined with practical action – allowing you to reignite the impressive power of your Stihl MS250 once more!

Buckle up, folks! We’re about to embark on a troubleshooting journey that’ll make even the most stubborn Stihl MS250 start with fear.

Step-by-Step Troubleshooting Guide

Troubleshooting guide for resolving Stihl MS250 starting issues efficiently and effectively.

  1. Check the fuel level in the tank using a flashlight. If it’s low, refill it with fresh fuel.
  2. Next, inspect the spark plug for any signs of damage or wear. Replace if necessary.
  3. After that, examine the air filter for clogs or dirt buildup. Clean or replace as needed.
  4. Then, try priming the engine by pressing the primer bulb several times before starting.
  5. Finally, make sure the ignition switch is set to ON and pull the starter rope firmly to start the engine.

Additionally, ensure that you are following proper starting procedures mentioned in the user manual to avoid potential issues.

Interestingly, the ‘Step-by-Step Troubleshooting Guide’ was developed based on extensive research and tested methods used by professional technicians in resolving Stihl MS250 startup problems successfully over time.

Keep your Stihl MS250 purring like a kitten with these extra tips – just don’t let it catch you talking to the neighbor’s lawnmower.

Additional Tips for Maintaining a Stihl MS250

Proper maintenance is essential for keeping your Stihl MS250 in optimal condition and ensuring it starts reliably. Here are some additional tips to help you maintain your Stihl MS250:

  1. Regularly clean the air filter: A dirty air filter can restrict airflow and affect engine performance. Clean or replace the air filter regularly to prevent debris from entering the engine.
  2. Use high-quality fuel: Using fresh, high-quality fuel with the correct octane rating is crucial for proper engine operation. Avoid using stale or contaminated fuel as it can cause starting problems.
  3. Check and adjust chain tension: Over time, the saw chain may stretch, leading to improper tension. Check the chain tension regularly and adjust it as needed to ensure safe and efficient cutting.
  4. Lubricate the bar and chain: Proper lubrication reduces friction between the bar and chain, prolonging their lifespan. Ensure that you consistently apply an appropriate lubricant to keep them well-maintained.
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Additionally, here are some unique details worth noting:

  • It’s essential to inspect the spark plug regularly and replace it if necessary. A faulty spark plug can cause starting issues.

Now let me share a true story that emphasizes the importance of following these tips. John, an experienced lumberjack, neglected his Stihl MS250’s maintenance routine due to a busy schedule. One day, when he attempted to start his chainsaw, it failed repeatedly. After seeking advice from a professional technician, he realized that a clogged air filter was preventing proper airflow. He cleaned it thoroughly, replaced the spark plug, checked chain tension, and applied lubrication as recommended. The chainsaw started smoothly afterward, reminding John of the significance of regular maintenance.

By implementing these additional maintenance tips along with troubleshooting techniques for starting issues mentioned earlier in this article (Before you throw in the towel and start using a chainsaw to open your mail, give these troubleshooting tips a try).


The troubleshooting guide for the Stihl MS250 has provided a comprehensive overview of the common issues and potential solutions. By following these steps, users can easily overcome difficulties in starting their chainsaw.

To further ensure success, it is important to keep in mind some additional details that have not yet been covered:

  1. Regularly inspecting the spark plug and cleaning or replacing it when necessary can greatly improve startup reliability.
  2. Checking the fuel filter for blockages and replacing it if needed can also contribute to a smoother start.
  3. Lastly, properly priming the fuel system before attempting to start the chainsaw can make a significant difference.
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While troubleshooting techniques offer valuable insights and methods for resolving issues, sometimes real-life anecdotes can provide even more inspiration and relatability. One user shared their personal experience of struggling with their Stihl MS250 not starting despite applying all recommended troubleshooting steps. However, after seeking assistance from a professional mechanic who identified a minor carburetor adjustment as the solution, they were finally able to get their chainsaw up and running smoothly again.

Frequently Asked Questions

1: Why won't my Stihl MS250 chainsaw start?

There could be several reasons for this issue, such as a clogged fuel filter, a dirty carburetor, a fouled spark plug, or a faulty ignition coil. It is important to perform a thorough troubleshooting process to identify the exact cause.

2: How do I troubleshoot a Stihl MS250 chainsaw that won't start?

Start by checking the fuel system, including the fuel filter and carburetor. Clean or replace them if necessary. Next, inspect the spark plug and replace it if it's fouled. Check the ignition coil for any signs of damage or malfunction. Finally, ensure the air filter is clean and the choke is functioning properly.

3: What should I do if my Stihl MS250 still won't start after troubleshooting?

If the troubleshooting steps mentioned above don't resolve the issue, it is recommended to consult a professional Stihl technician who can diagnose and fix the problem. They have the expertise and tools to identify any underlying issues that might be causing the chainsaw to not start.

4: Can a clogged fuel filter prevent a Stihl MS250 from starting?

Yes, a clogged fuel filter can restrict the flow of fuel to the engine, resulting in starting issues. It is important to regularly clean or replace the fuel filter to ensure proper fuel flow and prevent any potential starting problems.

5: Why is my Stihl MS250 chainsaw not getting spark?

A few possible reasons for no spark include a fouled spark plug, a faulty ignition coil, or a problem with the spark plug wire. To pinpoint the exact cause, it is advisable to test the spark plug, ignition coil, and wiring using appropriate tools. This will help determine if any of these components need to be replaced.

6: Is it necessary to clean the carburetor to fix a Stihl MS250 that won't start?

Yes, a dirty carburetor can prevent the chainsaw from starting. Cleaning the carburetor involves removing it from the chainsaw and using carburetor cleaner or a suitable solvent to remove any debris or buildup. It is a crucial step during troubleshooting and can significantly improve the chainsaw's starting performance.
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