In the world of carpentry, having the best equipment always helps you get your job done faster and more efficiently. The Stihl MS651 is a professional chainsaw designed to meet this need. But how does this saw differ from the 661 model? Here are the answers that unveil the mystery.
First and foremost, the most significant feature that sets the MS651 apart from the 661 is its lack of M-Tronic. M-Tronic is a feature often found in the 661, but there are also versions of the 661 without it. In contrast, none of the versions of the MS651 have M-Tronic. Only the carburetor version is available.
Interestingly, the MS651 is not sold in the United States, Canada, Germany, France, or other European countries, Australia, or New Zealand. However, it can be found in regions such as South Africa, Southeast Asia, and South America. So, what’s the reason behind this difference?
This discrepancy, it is said, stems from the unreliability of fuel quality in these countries compared to the West. Therefore, M-Tronic versions are not suitable. Higher octane fuel may be required in these regions, which may not always be available.
As an added insight from a carpentry expert: Tips on using the saw! How can you master cutting techniques to achieve the best results?
Stihl MS651 Vs MS661
Just like the MS 661 followed the MS 660, the MS 651 steps in as the successor to the MS 650. It’s a natural progression in Stihl’s lineup, each iteration aiming to improve upon its predecessor. However, diving into the specifics, it’s inevitable to draw comparisons between the MS 651 and its counterpart, the MS 661. Let’s take a closer look at their specifications side by side.
| STIHL | MS 651 | MS 661 C-M |
| CC | 91.1 cc | 91.1 cc |
| Power | 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 |
| Bar | 20 – 36″ | 20 – 36″ |
These are some social media comments about the Stihl MS 651 and its comparison to the MS 661:
- One user points out that the main discrepancy between the MS 651 and the MS 661 lies in the thickness of the base gasket. The thicker gasket in the MS 651 results in lower compression, allowing it to accommodate lower-grade fuels more effectively.
- Another user mentions that the MS 651 is essentially a low-compression version of the MS 661, specifically designed for countries with potentially poor fuel quality. This version features an adjustable carburetor to adapt to varying fuel conditions.
- Someone else highlights that the MS 651 is essentially the younger sibling of the MS 661, featuring an open port cylinder design. However, it’s expected to generate slightly less power than the MS 661. Additionally, it comes with an adjustable carburetor for flexibility.
- Another user finds it intriguing to see saws like the MS 651 not available in the USA, prompting them to research its purpose. They appreciate Stihl’s approach of designing saws tailored to markets with lower fuel quality, ensuring efficient performance.
- One user provides a concise comparison between the MS 651 and the MS 661, noting that while the MS 651 is almost identical to the MS 661, it offers slightly less power, produces more noise, lacks the M-Tronic option, and has notably inferior anti-vibration features.
- Additionally, it’s mentioned that the MS 651 has low compression and a smaller venturi, allowing it to run on lower-grade fuel more effectively, albeit with slightly reduced performance.
In terms of specifications, the MS 651 has a thicker cylinder gasket compared to the MS 661, reducing the probability of misfiring, especially in regions with lower-quality fuel. The comparison chart shared by Stihl illustrates differences in sound power, pressure levels, and vibration, attributed in part to the slightly lower power output of the MS 651. The weight discrepancy between the chart and the manual suggests that both the MS 651 and MS 661 likely weigh the same.
Stihl MS651 Specifications and Features:
- Displacement: 91.1 cc
- Bore: 56 mm
- Stroke: 37 mm
- Weight: 7.5 kg
- Engine Power: Up to 5.0 kW (6.8 bhp) at 9,500 rpm
- Idle Speed: 2,800 rpm
- Ignition System: Electronic magneto ignition
- Carburetor: All-position diaphragm carburetor with integral fuel pump
- Chain Lubrication: Fully automatic, speed-controlled reciprocating oil pump. Additional manual oil flow control.
- Spark Plug: Resistor type (Bosch WSR 6 F, NGK BPMR 7 A), Electrode gap: 0.5 mm
- Fuel Tank Capacity: 850 cc (0.85 l)
- Oil Tank Capacity: 400 cc (0.4 l)
The primary distinction between the MS651 and the 661 C-M lies in the carburetor system. While the 661 C-M utilizes a computer-controlled mix, the MS651 features an adjustable carburetor, offering manual control over fuel mixture.
Notable features of the MS651 include Elasto-start for smooth starting, tool-free fuel caps for convenience, a decompression valve for easier starting, and the Stihl Ematic system which reduces bar oil consumption. Additionally, it boasts an improved anti-vibration system, reducing vibration by approximately 50% compared to its predecessor.
For a more comprehensive understanding of the difference between MTronic and non-MTronic systems, refer to our Stihl 261 review.
MS651 Reviews
The buzz surrounding the Stihl MS651 is overwhelmingly positive, with users expressing surprise at its exceptional performance. Many attest to its power, smooth operation, and superior ease of maintenance compared to M-Tronic models. Stihl’s own marketing emphasizes its easy-to-repair technology, eliminating the need for specialized computer software for repairs.
Highlighted features include its high-performance capabilities for challenging tasks in dense forests, complemented by the STIHL anti-vibration system, HD2 filter with excellent filtering efficiency, and a controlled-delivery high-performance oil pump for optimal lubrication. Additionally, it comes standard with a roller chain catcher for added safety.
Online reviews echo this sentiment, with users sharing their preference for the MS651 over M-Tronic saws due to past negative experiences. Many express a desire to acquire the MS651 despite its limited availability in countries like Jamaica, Colombia, and Brazil.
Interestingly, the non-M-Tronic version of the MS661 has become more widely available in response to consumer demand, essentially offering a similar alternative to the MS651.
The main advantage of the MS651 lies in its user-friendly adjustable carburetor, favored by many chainsaw enthusiasts. However, in regions where the MS651 is not sold, opting for the MS661 might be a more practical choice due to better parts availability.
Stihl MS651 Chainsaw
The Stihl MS651 stands out as a formidable chainsaw, delivering impressive power and unwavering reliability, earning its reputation as a dependable workhorse in the field. In comparisons with the 661 M-Tronic model, it often emerges as the preferred choice among users, thanks to its straightforward operation and maintenance. However, when pitted against the non-M-Tronic version of the 661, the MS651 holds its ground admirably, showcasing comparable performance and functionality.
Regardless of the specific model, Stihl’s line of large chainsaws consistently garners praise for their robustness and effectiveness in demanding tasks. It’s worth noting, however, that these powerful tools deserve respect and proper handling to ensure longevity and safety.
If you’ve had the opportunity to own or operate a Stihl MS651, we invite you to share your thoughts and experiences in the comments below. And don’t forget to explore other pro-Stihl saws, including the MS880, Stihl Jetsaw, and Stihl Magnum saws, for a comprehensive range of options to suit your needs.