Stihl MS 661 C-M Chainsaw

• The STIHL TIMBERSPORTS® series competition chainsaw
• Suitable for large timber for the most demanding forestry applications
• M-Tronic ensures consistently optimal engine power
• Easy starting thanks to a single position and stop lever function
• High-performance oil pump with adjustable flow for excellent lubrication
• HD2 filter with high filtration capacity
• Bar length: 63/71/80 cm
• Displacement: 91.1 cm³
• Power: 7.3 HP
• Weight: 7.4 kg

63 cm bar and chain included
ROLLOMATIC ES LIGHT 63 cm 3/8 P 1.6 mm 84-link chainsaw bar
RS 63 cm 3/8 P 1.6 mm 84-link chainsaw chain

71 cm bar and chain included
ROLLOMATIC ES 71 cm 3/8 1.6 mm 91-link bar
Chain RS3 71 cm 3/8 1.6 mm 91 links

TECHNICAL DATA 

Displacement: 91.1 cm³
Power: 5.4 kW/7.3 HP
Pitch: 3/8" P
Weight: 7.4 Kg (without fuel, bar and chain)
Tank capacity: 850 cm³
Sound pressure level: 105 dB(A)
Sound power level: 118 dB(A)
Vibration value left: 6.9 m/s²
Vibration value right: 5.6 m/s²
Chain pitch: 3/8" P
Tank content: 0.85 l
Max RPM: 9500
Chain oil tank capacity: 400 cm³

EQUIPMENT

Long-life air filter with pre-filtration
This innovative system allows for a significantly longer filter lifespan. In fact, thanks to the pre-filtration, it removes coarser dirt particles, reducing the workload of the actual filter. The chainsaw can operate longer without the need to clean the filter compared to a chainsaw without this type of filter.

HD2 Filter
The new HD2 filter with polyethylene filtering material has pores 70% finer than felt and polyamide filters, allowing it to filter even the finest dust particles. Additionally, it is oil-repellent, making it easy to clean. The PET-coated filter core can be quickly mounted and removed without tools.

Compensator
Ensures a constant fuel-air mixture even when the air filter becomes dirtier.

ElastoStart
Thanks to the exclusive STIHL ElastoStart starting handle, combined with the manual fuel pump and the decompression valve, kickbacks during ignition are significantly reduced.

Ematic Chain Lubrication System
Depending on the type of guide bar and wood, the STIHL Ematic system reduces chain oil consumption by up to 50%. It consists of an Ematic guide bar, Oilomatic chain, and an adjustable low-flow oil pump. This ensures that the lubricant is delivered precisely and with minimal loss exactly where it is needed.

Anti-vibration System
Specially positioned damping zones reduce the transmission of vibrations from the engine and chain to the handle and grip.

Tool-free Fuel Cap
Special caps for the fuel tank and oil tank allow for easy opening and closing without tools.

Side Chain Tensioner
The chain is tensioned laterally via the sprocket. This prevents any contact between the operator’s hand and the sharp chain.

STIHL M-Tronic (M)
Fully electronic fuel metering and ignition timing adjustment. The STIHL M-Tronic (M) system ensures optimal engine performance, constant speed, and excellent acceleration behavior in every operating condition. Manual carburetor adjustment is no longer necessary.

Adjustable Flow Oil Pump
Different cutting lengths, types of wood, and working techniques require varying amounts of oil. The adjustable flow oil pump allows precise regulation of the oil flow rate according to needs. It is possible to reduce the amount of oil supplied by up to 50%.

Kombi Lever with Stop Button
The lever automatically returns to the operating position (I) after stopping.

Decompression Valve
The decompression system automatically opens the intake valve. This absorbs pressure peaks and reduces the amount of force needed on the starting rope.