Chainsaw Stihl MS 400 problems: Common Issues & Fix

The Stihl MS 400 chainsaw is a powerful tool that can quickly work even the toughest logs. However, like any mechanical device, it’s not immune to problems. 

From fuel leaks and ignition issues to cutting performance problems and damaged or broken chains, the MS 400 can throw various challenges your way. But don’t despair! Many of these issues can be quickly resolved with the proper knowledge and tools. 

So if your trusty MS 400 is giving you grief, take a deep breath and roll up your sleeves. With a little bit of elbow grease and some help from this guide, you’ll have your chainsaw back to its best in no time.

What Is Stihl MS 400 

The Stihl MS 400 is a top-of-the-line chainsaw designed for professionals who need reliable and robust equipment to get the job done. With its powerful engine and long-lasting chain, the MS 400 can easily tackle even the toughest logs. 

Whether you’re a logger, a tree cares professional, or just someone who loves working with wood, the MS 400 is an excellent choice. Its durability and safety features make it an excellent investment for anyone who needs a chainsaw that can handle heavy use. 

So if you want a tool that will help you work faster and more efficiently, consider the Stihl MS 400. It may become your new go-to chainsaw for all your woodcutting needs.

Specification of Chainsaw Stihl MS 400 

Here is a table with the detailed specifications for the Stihl MS 400 chainsaw:

SpecificationDescription
Engine type2-stroke
Displacement63.3 cc
Power output4.4 horsepower
Fuel tank capacity19.5 fl. oz.
Oil tank capacity13.5 fl. oz.
Weight13.9 pounds
Power sourceGas-powered
Bar length18 inches
Chain pitch3/8 inch
Chain gauge0.05 inch
Chain speed63.9 fts.
Oil pump capacity310 cc/min.
Noise rating110 dB
Vibration level5.1 m/s2
Vibration level (front / rear handle)2.6 m/s2 / 2.5 m/s2

Most Common Stihl MS 400 problems & Solutions

Problem: The chainsaw won’t start

Solution: If the chainsaw doesn’t start, it could be due to several issues. One common cause is a faulty spark plug. The spark plug is responsible for generating the spark needed to ignite the fuel in the engine. If the spark plug is old or damaged, it may not be able to generate a spark.

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To fix this issue, try replacing the spark plug. Another possible cause could be a clogged fuel filter. If the fuel filter is dirty or damaged, it can prevent fuel from reaching the engine. In this case, try cleaning or replacing the fuel filter.

Problem: The chainsaw is running poorly

Solution: If the chainsaw runs poorly, it could be due to a malfunctioning carburetor. The carburetor is responsible for mixing fuel and air in the correct ratio, so the engine may only sustain a consistent fuel supply if it’s working correctly. To fix this issue, try cleaning or rebuilding the carburetor.

Another possible cause could be a faulty ignition system. If the ignition system is not working correctly, it can prevent the engine from starting or running smoothly. Try cleaning or replacing the ignition system components, such as the spark plug or ignition coil.

Problem: The chainsaw is leaking oil

Solution: If the chainsaw leaks oil, it could be due to a damaged oil seal. The oil seal is responsible for preventing oil from leaking out of the crankcase, so if it’s damaged, the oil may leak out of the chainsaw. To fix this issue, try replacing the oil seal. Another possible cause could be a faulty oil pump.

If the oil pump is not working correctly, it may not be able to deliver the proper amount of oil to the chain and bar, which can cause oil to leak out of the chainsaw. In this case, try cleaning or replacing the oil pump.

These solutions help resolve any issues you may be experiencing with your Stihl MS 400 chainsaw.

Problem: The chainsaw is not cutting properly

Solution: If the chainsaw is not cutting correctly, it could be due to a light chain. To fix this issue, try sharpening the chain using a round file that is the same diameter as the chain.

If the chain is severely damaged or worn, it may need to be replaced. Another possible cause could be a misaligned bar. If the bar is not aligned correctly, it can cause the chain to cut poorly. In this case, try aligning the bar according to the manufacturer’s instructions.

Problem: The chainsaw is vibrating excessively

Solution: Excessive vibration can be caused by several issues, including a damaged or misaligned bar and chain or a damaged engine mount.

To fix this problem, try tightening the bar and chain or replacing them if they are damaged. If the engine mount is damaged, it may need to be replaced.

Problem: The chainsaw is smoking excessively

Solution: Excessive smoke can be caused by several issues, including a malfunctioning carburetor, an overfilled oil tank, or a damaged or clogged muffler.

To fix this problem, try cleaning or rebuilding the carburetor, checking the oil level and refilling if necessary, and cleaning or replacing the muffler if it is damaged or clogged.

These solutions help resolve any issues you may be experiencing with your Stihl MS 400 chainsaw.

Problem: The chainsaw is consuming too much fuel

Solution: If the chainsaw consumes too much fuel, it could be due to a malfunctioning carburetor. The carburetor is responsible for mixing fuel and air in the correct ratio, so if it’s not working correctly, the engine may consume more fuel than necessary.

To fix this issue, try cleaning or rebuilding the carburetor. Another possible cause could be a faulty fuel filter. If the fuel filter is dirty or damaged, excess fuel can reach the engine, leading to higher fuel consumption. In this case, try cleaning or replacing the fuel filter.

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Problem: The chainsaw is emitting too much exhaust smoke

Solution: If the chainsaw emits too much exhaust smoke, it could be due to a malfunctioning carburetor. The carburetor is responsible for mixing fuel and air in the correct ratio, so if it’s not working correctly, the engine may produce more smoke than usual.

To fix this issue, try cleaning or rebuilding the carburetor. Another possible cause could be a faulty spark plug. If the spark plug is old or damaged, it may not generate a strong enough spark to properly ignite the fuel in the engine, which can result in excess smoke. In this case, try replacing the spark plug.

Problem: The chainsaw is producing a low-power output

Solution: If the chainsaw produces low power output, it could be due to several issues. One possible cause is a faulty ignition system. If the ignition system is not working correctly, it can prevent the engine from producing its total power output.

Try cleaning or replacing the ignition system components, such as the spark plug or ignition coil, to fix this issue. Another possible cause could be a clogged fuel system. If the fuel system is clogged, it can prevent the engine from getting the fuel it needs to produce its total power output. In this case, try cleaning the fuel system or replacing any damaged components.

These technical solutions help resolve any issues you may be experiencing with your Stihl MS 400 chainsaw.

Chainsaw Stihl MS 400 problems

Step-by-step Guide: Troubleshooting Stihl MS 400 Chainsaw

Here is a step-by-step guide to troubleshooting the Stihl MS 400 chainsaw:

Step 1: Identify the problem

Before you begin troubleshooting, it’s essential to identify the problem you’re experiencing with your chainsaw accurately. Take note of any symptoms or issues you have noticed, such as difficulty starting the chainsaw, poor performance, excessive vibration or smoke, or oil leaks.

Step 2: Check the fuel system

One of the most common causes of issues with chainsaws is a problem with the fuel system. Begin by checking that you have sufficient fuel in the tank and that the fuel is fresh and properly mixed with the correct amount of oil. If the fuel system functions correctly, try cleaning or replacing the filter.

Step 3: Check the ignition system

If the fuel system is functioning correctly, but the chainsaw still won’t start or is running poorly, the next step is to check the ignition system. Begin by checking the spark plug to ensure it is clean and functioning correctly. If the spark plug is damaged or worn, replace it. You should also check the ignition coil and spark arrestor to ensure they function correctly.

Step 4: Check the carburetor

If the ignition system is functioning correctly, but the chainsaw is still experiencing issues, the next step is to check the carburetor. Begin by cleaning the carburetor and checking for any damage. If the carburetor is severely damaged or not functioning correctly, it may need to be rebuilt or replaced.

Step 5: Check the bar and chain

If the carburetor and ignition system is functioning correctly, but the chainsaw is still experiencing issues, the next step is to check the bar and chain. Begin by checking the tension of the chain and adjusting it if necessary. If the chain is dull or damaged, it may need to be sharpened or replaced. You should also check the bar for any damage or misalignment and adjust or replace it if necessary.

This step-by-step guide helps you troubleshoot any issues you may be experiencing with your Stihl MS 400 chainsaw. If you are still experiencing problems after following these steps, it may be necessary to seek professional repair or service for your chainsaw.

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Avoiding common mistakes when using the Stihl MS 400 chainsaw

Here are some tips to help you avoid common mistakes when using the Stihl MS 400 chainsaw:

  1. Don’t forget to wear protective gear
  2. Don’t force the chainsaw.
  3. Pay attention to maintenance.
  4. Don’t overreach
  5. Don’t use the chainsaw when you’re tired.

Maintaining the Stihl MS 400 to prevent future problems.

Sure thing! Here are some tips to help you maintain your Stihl MS 400 chainsaw and prevent future problems:

Clean the air filter regularly

The air filter is an essential component of the chainsaw that helps to keep dirt and debris from entering the engine. To keep your chainsaw running smoothly, it’s essential to clean the air filter regularly. Follow the manufacturer’s recommended schedule for cleaning the air filter, or clean it more frequently if you’re using the chainsaw in dusty or dirty conditions.

Sharpen the chain regularly.

A light chain can make it difficult to cut through wood efficiently and increase the risk of accidents. To keep your chainsaw performing at its best, it’s important to sharpen the chain regularly. Follow the manufacturer’s recommended schedule for sharpening the chain, or sharpen it more frequently if you use the chainsaw heavily.

Check and replace the spark plug as needed.

The spark plug is an essential component of the chainsaw that generates the spark needed to ignite the fuel in the engine. If the spark plug is old or damaged, it can prevent the chainsaw from starting or running smoothly. To prevent problems with the chainsaw, it’s essential to check the spark plug regularly and replace it as needed.

Keep the chainsaw well-lubricated.

Lubricating the chain and bar are essential for the smooth operation of the chainsaw. Keep the chain and bar well lubricated to prevent problems with the chainsaw by adding oil as needed. Follow the manufacturer’s recommended oil level and use the correct type of oil for your chainsaw.

Store the chainsaw properly

Proper storage can help prevent problems with the chainsaw. When not in use, store the chainsaw in a dry, secure location. Avoid storing the chainsaw in damp or humid conditions, which can lead to rust and other problems.

Following these maintenance tips can help prevent future problems with your Stihl MS 400 chainsaw and keep it running smoothly for years to come.

Chainsaw Stihl MS 400 Review Video

FAQ (Frequently Asked Questions)

Q: How often should I clean the air filter on my Stihl MS 400 chainsaw?

A: The frequency of cleaning the air filter on your Stihl MS 400 chainsaw depends on the usage and conditions in which you use the saw. As a general rule, it’s a good idea to clean the air filter every 25 hours of use or after every two tanks of fuel.

If you’re using the chainsaw in dusty or dirty conditions, you may need to clean the air filter more frequently.

Q: How often should I lubricate the chain and bar on my Stihl MS 400 chainsaw?

A: The frequency of lubricating the chain and bar on your Stihl MS 400 chainsaw depends on the usage and conditions in which you use the saw. As a general rule, it’s a good idea to lubricate the chain and bar every time you fill the fuel tank or whenever the chain appears dry or rusty. Use the correct type of oil for your chainsaw and follow the manufacturer’s recommended oil level.

Proper lubrication is essential for the smooth operation of the chainsaw and can help prevent problems such as excessive wear or damage to the chain and bar.

Q: What are some common problems with the Stihl MS 400 chainsaw?

A: Some common problems with the Stihl MS 400 chainsaw include difficulty starting, poor performance, excessive vibration or smoke, and oil leaks.

Q: What should I do if my Stihl MS 400 produces low power output?

A: If your Stihl MS 400 produces low power output, it could be due to several issues. One possible cause is a faulty ignition system. If the ignition system is not working correctly, it can prevent the engine from producing its total power output.

Try cleaning or replacing the ignition system components, such as the spark plug or ignition coil, to fix this issue. Another possible cause could be a clogged fuel system.

If the fuel system is clogged, it can prevent the engine from getting the fuel it needs to produce its total power output. In this case, try cleaning the fuel system or replacing any damaged components.

Conclusion

Like any mechanical device, the Stihl MS 400 can experience problems from time to time. Some common issues that users of the MS 400 may encounter include difficulty starting the chainsaw, issues with the fuel system, and problems with the chain and bar. 

It is essential to regularly maintain and service your chainsaw to help prevent problems from occurring. If you experience problems with your MS 400, you should contact a qualified service technician for assistance. 

It is also a good idea to refer to the operator’s manual for troubleshooting guidance and to ensure that you are using the chainsaw correctly.

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