Big timber saw for the toughest jobs in forestry. The M-Tronic guarantees optimum engine performance at all times, while its single start position and stop button function mean easy starting. Controlled-delivery high-performance oil pump for conveying high quantities of oil; HD2 filter with very good filter effect,
economical 2-MIX engine.
Versions
Price
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MS 661 C-M 3/8" R Chainsaw
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** Price on request from your STIHL Approved Dealer
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Technical data
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Displacement
cm³
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91,1
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Performance
kW
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5,4
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Weight
kg
1)
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7,4
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Power-to-weight ratio
kg/kW
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1,4
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Chain pitch
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3/8"
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EPA Certified fuel consumption
l/h
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2,87
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Oil tank volume
cm3
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400
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1) Without fuel, without bar and chain
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Standard features
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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.
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STIHL M-Tronic (M)
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.
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STIHL anti-vibration system
Precisely calculated buffer zones minimise 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.
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Carburettor heating (V)
By changing the chain saw from summer to winter operation, the intake air is pre-heated over the engine fins. This ensures that the carburettor does not ice up and you can continue working in freezing temperatures.
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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.
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Tool free fuel caps
Special caps to open and close the tank cap quickly, easily and without tools.
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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.
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Compensator
This controller in the carburettor prevents the fuel-air mixture getting richer as the air filter becomes clogged. The correct quantity of fuel is delivered to the carburettor 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.
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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.
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Side-mounted chain tensioning
Side-mounted chain tensioning makes it easy to tension the chain safely.
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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.
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
