4 Common Stihl Ms 661 Problems + Troubleshooting

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People trust in Stihl’s products. Why not? They are the best chainsaw manufacturing company.

However, even their products are not immune to mechanical problems. One such product is the Stihl MS 611 chainsaw. 

Some common Stihl Ms 661 problems you will likely experience are poor acceleration issues, the chain not rotating, a burning smell while cutting, and a struggling engine to reach the maximum rpm.

Note these problems might not come immediately after unboxing the unit. But whenever it does, you should be prepared to face it head-on with the help of this guide.  

4 Common Stihl Ms 661 Problems + Troubleshooting

Below is the list of stihl ms 661 problems, causes, and quick fixes: 

1. Poor Acceleration

Stihl MS 611 saws are prone to poor acceleration, often due to clogged or dirty air filter problems. 

Simply cleaning or replacing the dirty filter will ensure proper air intake to the engine, rectifying this issue. 

A worn spark plug could also affect combustion and acceleration. So inspect if it is in peak condition. If not, clean or replace using the manufacturer’s recommended type and gap. 

But nine out of 10 times, the leading cause is an over-tightened chain. It is either over-tightened or has gotten enough oil on it to run smoothly. 

You will have to tension the chain properly by loosening and greasing it a bit. 

2. Chain Not Rotating

Since this problem is closely related to the first, you must adjust the chain’s tension. 

If you need help fixing it, your user manual highlights how. 

Also, ensure the chains get a good lick of lubrication. Hence, fill the oil reservoir so that the oiler functions properly. 

The Chain Brake could also prevent the chain from rotating when the throttle is engaged. Ensure it is disengaging so the chain will rotate. 

Damage or debris guide bar is another factor. If excessively worn or dirty, it could obstruct the chain movement. 

3. A Burning Smell Is Released While Cutting

Perceiving a burnt smell from your chainsaw while cutting is an alarming issue that shouldn’t be ignored.

Most users let this roasting smell continue unchecked, thinking it is an overload issue. 

Could it be? Of course, it could if the engine overheats. But it can also be a worn-out clutch or a dull blade. 

Improperly tension chain will put more pressure on the motor, causing it to work harder than it should. This generates more heat internally, resulting in a burning smell. 

The right thing to do is sharpen the chain blades and feed it enough oil. Then, adjust the chain’s tension, as discussed in the previous section. 

4. The Engine Is Struggling To Reach The Maximum Rpm

Engine struggling to reach the maximum RPM might hinder your work. It is one of the most frustrating stihl MS 661 problems. 

To get it to its peak performance, a thorough investigation must be done by inspecting the fuel quality, air filter, spark plug, and carburetor.

Either of these could be the root cause.  

If you aren’t using high-quality fuel with the proper mix ratio or the air filter is clogged, it will affect the engine performance. The same goes for using a worn spark plug or if the exhaust system is restricted. 

You have to ensure the air filter and spark plug is spick and span. 

However, if you suspect the problem could be coming from an improper carburetor calibration, you should visit the repair shop.  

Frequently Asked Questions

Why Is Stihl Chainsaw Best?

Stihl’s reputation precedes them. 

They are the biggest chainsaw manufacturing company on the planet, known for nothing short of authenticity, wrapped with cutting-edge technology for peak performance, increased comfort, durability, and safety.

Stihl is way ahead of the curve, which is why professionals and homeowners bank on their tools. 

The company has earned its place amongst the people. 

What Is The Most Strongest Chainsaw?

The world’s most powerful chainsaw is the Stihl MS 881. 

It has a monstrous 121.6 cm3 powerhouse with an output of 6.4 kW/8.7hp —not to mention the massive 8.0 Nm of torque. 

The powerhead weighs about 9.9kg, or 12.7kg, and is equipped with the STIHL Rollomatic ES 75 cm/30” and a formidable  404″ Rapid Super chain that can cut through woods like paper. 

What Chainsaw Do Professionals Use?

Check there is something about the quality of their work. Is it experience? Maybe. 

But if you watch up close, all professionals in arboriculture or forestry have one thing in common aside from experience: they ALWAYS use the best chainsaw

They understand how demanding the task is and match the energy with a high-quality and reliable unit. This makes their job smooth sailing and so satisfying to watch. 

And this is what they are using: 

  • Stihl MS 271 Farm Boss Chainsaw
  • Echo CS-2511T Top Handle Chainsaw
  • Husqvarna T525 Top Handle Chainsaw
  • Stihl MS 261 C-M Chainsaw
  • Echo CS-590 Timber Wolf 60cc Chainsaw
  • Stihl MS 881 Magnum Chainsaw (up to 41″ bar)
  • Stihl MS 500i Chainsaw with EFI
  • Husqvarna 455 Rancher Chainsaw

What Brands Produces The Best Chainsaw? 

Chainsaws have flooded the market. It is now hard (more than ever) to tell apart quality from mediocre. 

One smart way to avoid this pitfall is sticking to reputable brands, as they always produce chainsaws with the best-in-class performance, reliability, and durability. 

Here are brands that do this exceptionally well; 

  • Husqvarna
  • Echo
  • Makita
  • Jonsered
  • Dolmar
  • Pioneer/Partner
  • Oregon
  • Shindaiwa


In conclusion, this article does not discourage you from owning a stihl MS 661. NO! 

Instead, it gives you a heads-up on what to expect from this unit and, when it does happen, how to address the issues. 

These problems will surface as time ticks away —like an aging human body prone to sicknesses. 

However, proactive maintenance is a good way to prevent most of it from happening. 


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