Stihl MS 390 problems: Common issues and Fixes

This gas-powered chainsaw is known for its durability, versatility, and high performance, but like any tool, it’s not without its faults.

In this article, I’ll discuss some common Stihl MS 390 problems that users have experienced, and provide tips on how to fix them.

Stihl Ms 390 Problems

The Stihl MS 390 is a popular chainsaw that’s designed for heavy-duty cutting tasks. It’s powered by a 64.1 cc two-stroke engine that delivers up to 3.4 kW of power, making it ideal for felling large trees or cutting thick logs.

However, its have some Problems that have affected its performance or safety.

Stihl Ms 390 Have some common Problems like

  1. Starting Issue
  2. Chain Malfunction
  3. Stalling
  4. Chain Brake
  5. Excessive vibration
  6. Overheating
  7. Oil Leaks

Now discuss these Problems in Detail and Give some Tips to Fix Them

Stihl Ms 390 won’t start

One of the most common issues that users have reported with the Stihl MS 390 is difficulty starting the engine. This can be frustrating, especially if you need to use the saw quickly.

The cause of this problem can be traced to several factors, such as a dirty air filter, a faulty spark plug, or an improperly adjusted carburetor.

To fix this problem, you can start by cleaning the air filter with compressed air or a brush. If the spark plug is fouled or damaged, replace it with a new one.

You can also try adjusting the carburetor to ensure that the fuel-air mixture is correct. If these steps don’t work, you may need to take the saw to a professional for further diagnosis.

The Chain Not Lubricating Properly

Another issue with the Stihl MS 390 is the chain not lubricating properly. This can cause the chain to become dull quickly, or even damage the bar and chain sprocket.

The cause of this problem is usually a clogged oil filter or oil port, or a faulty oil pump.

To fix this problem, you can start by cleaning the oil filter and port with a brush or compressed air.

You can also check the oil pump to ensure that it’s working properly, and adjust the flow rate if necessary. If these steps don’t work, you may need to replace the oil pump or seek professional help.

Loss of Power or Stalling

Stihl MS 390 has experienced a loss of power or stalling during use. This can be dangerous, especially if you’re cutting a large tree or log.

The cause of this problem can be traced to several factors, such as a dirty air filter, a clogged fuel filter, or a faulty ignition coil.

To fix this problem, you can start by cleaning the air and fuel filters, and replacing them if necessary.

You can also check the spark plug and ignition coil to ensure that they’re working properly. If these steps don’t work, you may need to take the saw to a professional for further diagnosis.

Chain Brake Not Working

The chain brake is an important safety feature on the Stihl MS 390 that’s designed to stop the chain in case of kickback or other accidents.

However, sometimes the chain brake doesn’t work properly or gets stuck in the “on” position.

To fix this problem, you can start by cleaning the chain brake mechanism with a brush or compressed air. You can also adjust the tension of the.

Excessive vibration

Stihl MS 390 experiences excessive vibration while used, which can be uncomfortable and even lead to hand fatigue or injury.

This problem can be caused by several factors, such as a loose or damaged bar, a worn-out chain, or a malfunctioning engine.

To fix this problem, you can start by inspecting the bar and chain for any signs of wear or damage, and replacing them if necessary.

You can also check the engine mounts and tighten any loose bolts or screws. If the vibration persists, you may need to take the saw to a professional for further diagnosis.

Overheating of Stihl Ms 390

Sometimes Stihl MS 390 is overheating, especially during prolonged use. This can cause the engine to stall or even damage some of the internal components, such as the piston or cylinder.

stihl ms 390 Overheating

To avoid this problem, you can make sure that the air filter and cooling fins are clean and free of debris.

You can also check the fuel mixture to ensure that it’s not too lean, and avoid using the saw in hot or humid conditions. If the chainsaw still overheats, you may need to take it to a professional for further diagnosis.

Stihl Ms 390 leaking oil

Stihl MS 390 Leaks Oil, which can be messy and even pose a fire hazard if the oil comes into contact with hot engine parts.

To fix this you can start by inspecting the oil tank and lines for any signs of damage or wear, and replacing them if necessary.

You can also check the oil cap and gasket to ensure that they’re tight and properly sealed. If the leak persists, you may need to take the saw to a professional for further diagnosis.

Final Words

Stihl MS 390 is a powerful and reliable chainsaw that can handle a variety of cutting tasks with ease. However, like any tool, it is not immune to problems or malfunctions. Many of these problems can be addressed with proper maintenance and troubleshooting techniques. By following the manufacturer’s recommendations and taking care of your Stihl MS 390.

FAQs

Can I use regular gasoline in my Stihl MS 390?

No, you should use high-quality gasoline with a minimum octane rating of 89, and mixed with high-quality two-stroke engine oil at a ratio of 50:1.

How can I prevent chain tensioning problems on my Stihl MS 390?

Make sure to check the tension of the chain regularly, and adjust it as needed using the chain tensioning screw. Also, make sure that the bar and chain are properly lubricated with bar and chain oil to prevent excessive wear and stretching.

What should I do if my Stihl MS 390 is overheating?

You can try cleaning the air filter and cooling fins, and checking the fuel mixture.