Stihl MS 661 C-M Chainsaw
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The Stihl MS 661 C-M chainsaw is a very powerful high-performance saw with advanced 2-MIX technology and STIHL M-Tronic (M). The electronic engine management system regulates the ignition timing and the fuel supply and automatically registers the external temperature for optimal engine performance, great acceleration and sustained maximum torque. Extremely robust and durable with low vibration levels. Designed for professional use within forestry and big timber harvesting. Supplied with a rollomatic guide bar and full chisel rapid super chain.
The 28" bar supplied is the Stihl ES Light Guide bar as per the picture
The 36" bar supplied is the Stihl Rollomatic ES guide bar. (This is because Stihl does not produce the light bar in 36" lengths)
Technical data
| Displacement cm³ | 91.1 |
| Power output kW/bhp | 5.4/7.3 |
| Weight kg 1) | 7.4-7.5 |
| Power-to-weight ratio kg/kW | 1.4 |
| System weight kg 2) | 9.22 / 10.28 |
| CO2 g/kWh | 711 |
| Sound pressure level dB(A) 3) | 105 |
| Sound power level dB(A) 3) | 118 |
| Vibration values left/right m/s² 4) | 6.9/5.6 |
| Tank volume l | 0.85 |
| STIHL Oilomatic saw chain pitch/type | 3/8" RS |
| Bumper spike | Stahlkralle |
| Sprocket - number of teeth | 7.7 Z |
| Cylinder | Chrom |
| Oil pump | einstellbar |
| Filter | Patronenfilter HD2 |
| Sprocket | Chain sprocket,Ringkettenrad |
| Chain tensioning | seitliche Kettenspannung,Side chain tension |
| Anti vibration system | Standard AV-System |
| Filler cap | WTV werkzeugloser Tankverschluss |
| Chain pitch | 3/8",3/8" |
| EPA Certified fuel consumption l/h | 2.841 |
| Oil tank volume cm3 | 400 |
1) without bar/chain - ESLight bar only fitted to 28" machine.
2) (K) factor according to Dir. 2006/42/EC = 2m/s²
3) Power factor according to DIR2006/42/EC=2.5(dB(A))
Additional features
HD2 filter
The newly developed HD2 filter is made from polyethylene filter material with up to 70% finer pores than fleece and polyamide filters to trap even very fine dust. In addition, it is oil and water-repellent and thus very easy to clean. The PET-covered round filter cartridge with quick-release lock enables the filter to be assembled and disassembled in next to no time, without using tools.
Anti-vibration system
Intense vibration at the handles of power tools can lead to long-term effects on blood vessels in the hands and arms. STIHL has therefore developed an effective anti-vibration system whereby the oscillations from the machine's engine are dampened which significantly reduces vibrations at the handles.
STIHL ElastoStart
STIHL ElastoStart reduces the shock caused by the compression of the engine during starting. The compression shock is taken away from the user's joints and muscles through a spring or rubber element in the starter handle.