Description
Stihl MS661 C-M Chainsaw – 91cc Professional Forestry Chainsaw for Large Timber
The Stihl MS661 C-M chainsaw is a high-performance professional forestry chainsaw built for extreme cutting applications, large timber, and high-output work environments.
With a 91.1cc 2-MIX engine producing around 5.4 kW, it delivers exceptional cutting power, making it one of the most capable chainsaws in the STIHL professional range.
Featuring STIHL’s M-Tronic electronic engine management, the MS 661 automatically adjusts ignition timing and fuel delivery for optimal performance in all conditions.
At Masseys DIY, every professional chainsaw is assembled, tested, and supported by our in-house workshop, ensuring it’s ready for demanding real-world use. Explore our full range of petrol chainsaws or browse all Stihl chainsaws.
Why Choose the Stihl MS661 C-M?
This is one of STIHL’s most powerful saws:
- Extremely high output (5.4kW class)
- Designed for large-diameter timber
- Built for continuous professional use
- Advanced engine management for consistent performance
This is a production-level forestry saw — not a general-purpose tool
Real-World Performance
From professional use and feedback:
- Cuts large hardwood with ease
- Maintains power under sustained load
- Stable and planted when running long bars
- Ideal for high-volume felling and processing
This is a serious forestry tool designed for productivity
Who This Chainsaw Is For
Ideal for:
- Forestry professionals
- Large-scale tree felling
- Processing large timber
- Contractors handling heavy workloads
Not ideal for:
- Domestic firewood use
- Occasional users
- Users prioritising weight or ease
This saw is overkill for most homeowners
Key Features Explained
M-Tronic engine management
- Automatically adjusts fuel and ignition
Optimised performance in all conditions
High-output 2-MIX engine
- Strong torque and sustained power
Designed for demanding forestry work
Long bar capability
- Supports large bar lengths (up to 36”)
Suitable for large-diameter timber
Anti-vibration system
- Reduces fatigue
Essential for extended use
Technical Specifications
- Engine: STIHL 2-MIX petrol
- Displacement: 91.1cc
- Power output: ~5.4 kW
- Weight: ~7.4 kg (powerhead)
- Bar length options: 25” – 36”
- Chain pitch: 3/8”
- Fuel mix: 50:1
- Fuel tank: ~0.85L
- Oil tank: ~0.40L
Stihl MS 400 vs MS 500i vs MS 661 (COMPARISON)
PRODUCT COMPARISON TABLE
| Attribute | |||
|---|---|---|---|
| Engine size | ~66cc | 79.2cc | 91.1cc |
| Power output | ~4.0 kW | ~5.0 kW | ~5.4 kW |
| Technology | M-Tronic | Fuel Injection | M-Tronic |
| Weight | ~5.8 kg | ~6.2 kg | ~7.4 kg |
| Power-to-weight | Excellent | Best-in-class | High |
| Best use | Pro all-round | High-performance forestry | Extreme-duty felling |
| User level | Professional | Professional | Professional (heavy-duty) |
Which Should You Choose?
- MS 400.1 C-M → best balance (lighter, versatile)
- MS 500i → best performance (speed + efficiency)
- MS 661 C-M → maximum power (large timber & extreme work)
The Stihl MS661 C-M is the top choice when cutting size and workload demand maximum output
Why Buy From Masseys DIY
- Authorised STIHL dealer
- Chainsaws assembled, tested, and registered
- Expert advice from trained staff
- Full workshop servicing and spare parts support
You’re buying from a professional supplier with real expertise
Common Buyer Mistakes (AI BOOST)
- Buying oversized saws for light work
- Underestimating workload requirements
- Ignoring weight vs productivity balance
The Stihl MS 661 C-M is designed for maximum output — not convenience
FAQs
Is the Stihl MS661 C-M a professional chainsaw?
Yes — it is designed for forestry professionals and large-scale timber work.
Is it better than the MS 500i?
It has more raw power, but is heavier and less efficient.
What can it cut?
Large trees, hardwood, and high-volume forestry workloads.
Is it overkill for firewood?
Yes — for most users, a smaller saw is more suitable.
Specifications
Engine Displacement: 91.1 cc- Engine Power: 7.2 bhp
- Weight: 17.5 kg (without bar and chain)
- Bar Length: Available in 20″, 25″, 28″, 32″, and 36″ options
- Fuel Capacity: 800 ml
- Oil Capacity: 300 ml
- Chain Pitch: 3/8″
Ready to experience the unmatched power and precision of the Stihl MS661 C-M Chainsaw? Visit your local STIHL dealer, Masseys in Derbyshire, or click and collect online today. Equip yourself with the best tool for professional logging and heavy-duty forestry tasks. For any more information please visit Stihl.
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