Stihl MS 651 Vs 661: Which Is Better?

When comparing the Stihl MS 651 and the Stihl MS 661 chainsaws, it’s natural to wonder which one comes out on top. These two formidable machines are designed for heavy-duty tasks, but they do have subtle differences that set them apart. If you’re in the market for a professional chainsaw and find yourself torn between the Stihl Stihl MS 651 Vs 661 let’s take a closer look at their features to help you make an informed decision.

Stihl MS 651

Stihl MS 651

The Stihl MS 651 is a high-performance chainsaw designed to tackle demanding applications in high-density stands. Equipped with the STIHL anti-vibration system, it minimizes vibrations for increased comfort and reduces operator fatigue during prolonged use. The HD2 filter ensures excellent filtering efficiency, keeping the engine running smoothly and extending its lifespan.

Additionally, the controlled-delivery high-performance oil pump ensures effective oil delivery, allowing for optimal lubrication of the chain. As for safety features, the roller chain catcher comes as standard, providing added protection in case of a chain derailment. With its powerful performance and reliable features, the Stihl MS 651 is a versatile chainsaw built to excel in challenging cutting tasks.

Stihl MS 661

Stihl MS 661

The Stihl MS 661 is a top-of-the-line chainsaw that combines cutting-edge technologies with exceptional performance. With a weight of only 7.4 kg, it offers an impressive power-to-weight ratio, making it the lightest chainsaw in its engine displacement class. The MS 661 packs a powerful punch with its 5.4 kW output, enabling it to handle demanding cutting tasks with ease.

This chainsaw’s lightweight design not only enhances maneuverability but also reduces strain on the operator, even during prolonged use. Whether you’re harvesting large timber or tackling challenging projects, the Stihl MS 661 is a reliable choice that provides outstanding performance for skilled professionals.

Stihl MS 651 Vs 661: Comparison detail


You can check the following sheet to learn Stihl MS 651 Vs 661 specs:

Specification Stihl MS 651 Stihl MS 661 C-M
Engine Displacement 91.1 cc 91.1 cc
Power Output 5 kW / 6.8 hp 5 kW / 7.3 hp
Weight 7.4 kg / 16.3 lb 7.4 kg / 16.3 lb
Bore 56 mm 56 mm
Stroke 37 mm 37 mm
Compatible Bar Sizes 20 – 36″ 20 – 36″

Engine Displacement

The Stihl MS 651 Vs 661 chainsaws are both excellent choices for professional-grade cutting tasks, but there are important differences to consider when choosing between them. One of the main contrasts between these two models is engine displacement. While the MS 651 has a displacement of approximately 65.1 cm³, the MS 661 has a more substantial engine displacement of around 91.1 cm³. The larger engine displacement of the MS 661 means it has a greater combustion chamber, which leads to more air and fuel mixture, potentially resulting in higher power output.

Power Output

Speaking of power output, this is another major factor to consider when deciding between the Stihl MS 651 Vs 661. The MS 661 is known for its high power output of around 5.4 kW or 7.3 PS, while the MS 651 typically delivers less power with an output of approximately 3.4 kW or 4.6 PS. That being said, the MS 651 is still a reliable choice for many cutting tasks and may be more than sufficient for those who don’t require as much cutting power.


Finally, we come to weigh a necessary consideration for anyone who will be using their chainsaw for extended periods. The MS 661 is slightly heavier, weighing around 7.4 kg, compared to the MS 651, which weighs in at approximately 6.5 kg. While the weight difference between the two models may not be significant, it’s important to choose the chainsaw that feels comfortable and doesn’t strain the user’s arms and hands during use.

Power-to-Weight Ratio

When comparing the Stihl Stihl MS 651 Vs 661 chainsaws, there are several factors that differentiate the two models. One important factor is the power-to-weight ratio. The MS 661 has a higher power-to-weight ratio compared to the MS 651 due to its larger engine displacement and higher power output. This means that for each kilogram of weight, the MS 661 generates more power, making it better suited for tasks requiring high power output.

Sound Pressure Level

Next, let’s consider the sound pressure level produced by each chainsaw. The MS 651 has a sound pressure level of approximately 107 decibels (dB) while the MS 661 produces around 105 dB. Both models produce considerable noise during operation, but the MS 661 has a slightly lower sound pressure level. Hearing protection should be used when operating either of these chainsaws to prevent hearing damage.

Saw chain pitch

Lastly, the saw chain pitch is an essential factor to consider. Both the Stihl Stihl MS 651 Vs 661 have a saw chain pitch of 3/8 inch. This means that they are compatible with the same size chain, allowing them to cut through materials of similar thicknesses. The 3/8 inch pitch is suitable for a range of cutting tasks, and both chainsaws offer the versatility needed for various applications.


There is a notable price difference between the two models. The Stihl MS 651 is priced at $919.98, while the Stihl MS 661 has a higher price tag of $1,559.99. Prices may vary depending on the location and the retailer from where you plan to purchase the chainsaw. These prices are provided as a general reference and can be subject to change. You can check the latest price from here.

Stihl MS 651 Vs 661: Which is better?

Stihl MS 651 Vs 661

When it comes to determining which chainsaw is better between the Stihl Stihl MS 651 Vs 661, it ultimately depends on your specific requirements. The MS 661 has a higher power-to-weight ratio, meaning it generates more power for its weight. This can make it more suitable for heavy-duty tasks that require extra cutting power. However, the MS 651 is still a capable chainsaw with a slightly higher sound pressure level and vibration levels compared to the MS 661. If you prioritize a quieter and potentially less fatiguing operation, the MS 661 might be the better choice.

Additionally, both the Stihl MS 651 Vs 661 share the same 3/8 inch saw chain pitch, providing compatibility with chains of the same size. Therefore, if the chain pitch is the primary consideration, both models would serve your needs equally well. Ultimately, it is essential to assess your specific requirements, such as the intended use, power demands, and personal preferences, to determine which chainsaw, either the MS 651 or MS 661, would be the better fit for you.


What size bar can an STIHL 661 take?

The STIHL 661 chainsaw can accommodate a variety of bar sizes, including 16-inch, 18-inch, 20-inch, and 25-inch bars.

How many ccs is a 661 STIHL?

The STIHL 661 chainsaw has an engine displacement of 91.1 cubic centimeters (cc).

What does MS mean on STIHL chainsaws?

In the context of STIHL chainsaws, “MS” stands for “Motorsäge,” which is German for “motor saw.” It signifies that the product is a chainsaw manufactured by STIHL.

What model is the best Stihl chainsaw?

Determining the best STIHL chainsaw model depends on individual needs and preferences. STIHL offers a range of models suitable for different applications and requirements, such as the MS 261, MS 362, and MS 500i.


Both the Stihl Stihl MS 651 Vs 661 have their own strengths, and the better option depends on your specific needs. The Stihl MS 651 offers a lightweight design and excellent fuel efficiency, making it an ideal choice for those seeking maneuverability and prolonged use. On the other hand, the Stihl MS 661 boasts a higher power output and a larger fuel tank capacity, catering to users who require maximum cutting performance and extended operation.