STIHL MS 661 C-M Petrol Chainsaw | 50 cm
The competition saw of the STIHL TIMBERSPORTS® Series
Product description
The STIHL MS 661 C-M is a real powerhouse offering high, constant performance. It combines cutting-edge technology with an optimum power-to-weight ratio of 1.4 kg/kW and is ideal for particularly tough and demanding forestry work. You can work even large timber effectively and quickly with this high-performance saw – it is even used as a competition saw in the STIHL TIMBERSPORTS® Series.
Common problems
Particularly tough forestry work in large timber places typical demands on the chainsaw:
- Large timber demands above-average engine power and pulling power
- Long and very long cutting attachments need a reliable, sufficient oil supply
- Manual carburettor adjustment responds only slowly to changes in altitude and outside temperature
Solution
The MS 661 C-M tackles this with a powerful 5.4 kW STIHL 2-MIX engine for the highest demands, an adjustable high-performance oil pump for long cutting attachments and STIHL M-Tronic for consistently optimum engine performance in all conditions.
Key features
- Extremely powerful professional saw with 50 cm RS cutting attachment
- STIHL M-Tronic for optimum engine performance from the start
- STIHL 2-MIX engine with 5.4 kW (7.3 hp) output
- Optimum power-to-weight ratio of 1.4 kg/kW
- Adjustable high-performance oil pump for long cutting attachments
- Carburettor preheating for reliable operation in winter
- HD2 filter with excellent filtering performance
- STIHL anti-vibration system for more comfortable working
Highlights
Competition saw of the STIHL TIMBERSPORTS® Series
The MS 661 C-M is used in the internationally renowned competition series for professional sport lumberjacking – proof of its exceptional performance.
Powerful 5.4 kW engine
The STIHL 2-MIX engine delivers the pulling power needed for the toughest forestry work in large timber, with an optimum power-to-weight ratio of 1.4 kg/kW.
Adjustable high-performance oil pump
For very long cutting attachments or very dry wood, the oil delivery rate can be increased as needed – with the E setting offering up to 50% less oil consumption in standard conditions.
STIHL M-Tronic
The fully electronic engine management automatically controls ignition timing and fuel metering, taking temperature, altitude and fuel quality into account.
Carburettor preheating
Switch from summer to winter operation in one simple move. Preheated intake air prevents the carburettor from icing up.
Comfortable working
The STIHL anti-vibration system significantly reduces strain on arms and hands during longer forestry work in large timber.
Technical data
| Part number | 1144 200 0364 |
| Displacement | 91.1 cm³ |
| Power | 5.4 kW / 7.30 hp |
| Weight without fuel | 7.5 kg |
| Bar length | 50 cm |
| Chain pitch | 3/8″ |
| Chain type | Rapid Super (RS) |
| Sound pressure level | 105 dB(A) |
| Sound power level | 118 dB(A) |
| Vibration value left/right | 6,9 / 5,6 m/s² |
In the box
- STIHL MS 661 C-M petrol chainsaw
- 50 cm guide bar
- 3/8″ Rapid Super (RS) saw chain
- Combination spanner
- Operating instructions
Frequently asked questions (FAQ)
Who is the STIHL MS 661 C-M suitable for?
The STIHL MS 661 C-M is aimed at forestry professionals looking for an extremely powerful chainsaw for the toughest work in large timber.
Is this saw really used in competition?
Yes, the MS 661 C-M is used as a competition saw in the STIHL TIMBERSPORTS® Series, an international series for professional sport lumberjacking.
How heavy is the chainsaw in use?
The saw weighs 7.5 kg without fuel, guide bar and saw chain.
Which bar length should I choose?
50 cm is suitable for heavy large-timber work, 63 cm for even thicker trunks and 71 cm for maximum reach with very large timber.
What is included?
The chainsaw, matching guide bar, saw chain, combination spanner and operating instructions are included.
Safety information & manufacturer details
Using a chainsaw requires experience and safe handling of the tool.
Before first use, familiarise yourself with the operation and the applicable safety regulations.
Please also note the requirements for suitable protective clothing such as chainsaw trousers, safety boots, gloves and a safety helmet with face and hearing protection.
If you are unsure about operating the machine, we recommend a personal handover and instruction from an authorised STIHL dealer.
- Read the operating instructions and safety information in full before first use.
- Wear suitable personal protective equipment.
- Use chainsaws only for their intended purpose.
Manufacturer information
STIHL Vertriebszentrale AG & Co. KG
Robert-Bosch-Straße 13
64807 Dieburg, Germany
Phone: +49 6071 204-0
Email: kundenservice@stihl.de
Data use information (Regulation (EU) 2023/2854)
| Connected products | All STIHL products connected to ‘STIHL connected’. |
| Access to product data | Product data is available in the ‘STIHL connected’ application. The product must be added first. |
| Deleting the user account | When your organisation is deleted, all linked data is removed, subject to statutory retention obligations. |
| Product data collected | Operational readiness status, service information and runtime data. |
| Data format | CSV file (Excel-compatible). |
| Data volume | Less than 1 MB per connected product. |
| Collection | Continuously in real time. |
| Storage location | Cloud infrastructure of the STIHL Group. |
| Storage period | Until the organisation is deleted, taking statutory retention periods into account. |
