STIHL MS 661

R25,995.00

Professional chainsaw with enhanced fuel efficiency

When professionals need to fell large trees, in large quantities, they reach for the saw they know has the power to get the job done – the MS 661 C-M. Featuring an impressive power-to-weight ratio and STIHL M-Tronic™ engine management technology, the MS 661 C-M chainsaw also delivers less vibration and 20% greater fuel efficiency than the MS 660. Other features include a long-life filter system using HD-2 filter elements to provide longer run times between maintenance, an ElastoStart™ handle, and a high output adjustable oiler.

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Technical Data

  • Displacement cm³: 91.1
  • Performance kW: 5.4
  • Weight kg: 7.4
  • Power-to-weight ratio kg/kW: 1.4
  • Sound pressure level dB(A): 105
  • Sound power level dB(A): 118
  • STIHL Oilomatic saw chain pitch/type: 3/8
  • Chain pitch: 3/8
  • Tank volume l: 0.85
  • Chain brake: QuickStop
  • Anti-vibration system: Standard AV-System
  • Handle design: Standardgriff
  • Carburetor: STIHL M-Tronic
  • Oil tank volume cm3: 400

Features

  • STIHL 2-MIX Motor: The economical STIHL 2-MIX engine with 1-in-4-channel technology impresses with high torque over a wide speed range. The chainsaw saves up to 20% fuel compared to STIHL two-stroke engines of the same performance without 2-MIX technology. Exhaust emissions are reduced by up to 50%.
  • HD2 filter: This air filter keeps even the finest dust away from the engine, ensuring a particularly long service life. Thanks to its special material, the filter can easily be cleaned by washing, for example with STIHL Varioclean and warm water.

  • STIHL M-Tronic (FT): For a cold start, the STIHL M-Tronic only needs one start position on the combi-lever. After starting, you can immediately power up to full speed. The amount of fuel required is precisely calculated by the system and supplied as needed. Otherwise, start in position I as usual

  • STIHL anti-vibration system: Precisely calculated buffer zones minimize the transfer of engine and saw chain vibrations to the front and rear handles. The chainsaw therefore runs noticeably smoother. This allows the user to save their strength and work longer.

  • STIHL ElastoStart: Due to compression pressure, jerky stresses occur when starting internal combustion engines. The damping element in the ElastoStart special starter grip alternately absorbs and releases force according to the compression pattern. The result is smooth, even starting.

  • Tool free fuel caps: Special caps to open and close the tank cap quickly, easily and without tools.

  • Decompression valve: The decompression valve is part of the easy starting system. The valve should be pressed before starting to reduce the compression pressure when starting, as well as reducing the effort needed to pull the starter rope. The decompression valve is semi-automatic; it must be pressed manually before starting, but then closes automatically.

  • Compensator: This controller in the carburetor prevents the fuel-air mixture getting richer as the air filter becomes clogged. The correct quantity of fuel is delivered to the carburetor depending on the quantity of air passing through the air filter. This keeps the fuel/air ratio in the combustion mixture constant and hence also the engine power. The filter doesn’t need to be cleaned until an appreciable drop in power occurs.

  • STIHL Ematic System: Compared to conventional bars without Ematic, the STIHL Ematic system reduces the consumption of chain lubricant by up to 50 %, depending on the type of wood and the cutting attachment used. This system comprises a STIHL Ematic or Ematic S guide bar, a STIHL Oilomatic saw chain and a variable-flow or reduced-flow oil pump. As a result, virtually every drop of chain lubricant is delivered to exactly the right spot.

  • QuickStop Chain Brake: The chain brake on your STIHL chainsaw can be triggered automatically or manually. In both cases, the brake band encloses the clutch drum and prevents the chain starting to move even when the throttle trigger is squeezed. The chain brake is applied manually by pressing the front hand guard on your STIHL chainsaw forwards. It is activated automatically whenever a sufficiently strong kickback is encountered.

  • Side-mounted chain tensioning: Side-mounted chain tensioning makes it easy to tension the chain safely.

  • Controlled-delivery oil pump: Different bar lengths, wood types and sawing techniques require different amounts of oil. The controlled-delivery oil pump allows the user to select just the right amount of oil for the job at hand.