Top of the range, high torque farmer chain saw
MS 391 STIHL CHAINSAW 20 inch { fan cover side }
![Picture](/uploads/3/4/3/2/34320369/2032942.jpg?349)
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Easy-to-manage, high-torque chain saw for improved performance and user comfort when harvesting wood or sawing firewood. High torque over a wide range of speeds. Up to 20% less fuel consumption and up to 50% lower emissions compared with the previous model without 2-MIX technology.
MS 391 STIHL CHAINSAW 20 inch { bar cover side }
(1) without bar/chain
(2) K-factor Directive 2006/42/EC according to 2.5 DB(a)) =
(3) K-factor Directive 2006/42/EC according to = 2 m/s²
(2) K-factor Directive 2006/42/EC according to 2.5 DB(a)) =
(3) K-factor Directive 2006/42/EC according to = 2 m/s²
Durable, high performing farm saw
STIHL 2-MIX reduced-emission engine technology :
![Picture](/uploads/3/4/3/2/34320369/3503320.jpg?164)
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2-stroke engine with stratified charge. A fuel-free layer of air is created between
the burned charge in the combustion chamber and the fresh charge in the crankcase,
reducing the amount of fuel lost during the charge cycle. This results in more power
with a lower weight, up to 20% lower fuel consumption than regular 2-stroke engines
and significantly reduced exhaust emissions.
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the burned charge in the combustion chamber and the fresh charge in the crankcase,
reducing the amount of fuel lost during the charge cycle. This results in more power
with a lower weight, up to 20% lower fuel consumption than regular 2-stroke engines
and significantly reduced exhaust emissions.
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STIHL 4-channel technology
![Picture](/uploads/3/4/3/2/34320369/9920443.jpg?164)
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Advanced combustion technology
Four overflow channels swirl the fuel-air mix before ignition, allowing for optimum
combustion and highly efficient performance. The result is lower fuel consumption
and high torque across a broad rpm range.
(Similar to picture)
Four overflow channels swirl the fuel-air mix before ignition, allowing for optimum
combustion and highly efficient performance. The result is lower fuel consumption
and high torque across a broad rpm range.
(Similar to picture)
Long term filtration system with pre-separation:
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STIHL long-life air filtration systems with pre-separation achieve perceptibly
longer filter life compared with conventional filter systems. Air drawn in is
swirled. The larger, heavier particles are ejected. The pre-cleaned air is
routed to the air filter via the pre-separator duct.
(Similar to picture)
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longer filter life compared with conventional filter systems. Air drawn in is
swirled. The larger, heavier particles are ejected. The pre-cleaned air is
routed to the air filter via the pre-separator duct.
(Similar to picture)
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Anti vibration system:
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In the longer term, strong vibrations at the handle points
of motor equipment can lead to poor circulation in hands and
arms. STIHL has therefore developed a high quality anti vibration system.Motor
devices with AV system, the vibrations generated by the engine and the
working environment, be substantially reduced at the handle points.
(Similar to picture)
of motor equipment can lead to poor circulation in hands and
arms. STIHL has therefore developed a high quality anti vibration system.Motor
devices with AV system, the vibrations generated by the engine and the
working environment, be substantially reduced at the handle points.
(Similar to picture)
Decompression valve
![Picture](/uploads/3/4/3/2/34320369/_1966012.jpg)
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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 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.
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 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.
Carburettor heating:
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Carburettor heating
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.
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.
Tool-less tank lid:
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Tool free filler caps
Special catches on the fuel and oil tanks for easy opening and locking without
the need for tools
(Similar to picture)
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Special catches on the fuel and oil tanks for easy opening and locking without
the need for tools
(Similar to picture)
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Compensator:
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The STIHL compensator, a control system in the carburettor, ensures
that despite increasing pollution of the air filter engine performance, exhaust
quality and fuel consumption over a long period remain almost constant.
Only when a noticeable performance degradation occurs,
the air filter must be cleaned. So, very long working
intervals without maintenance are possible. (Similar to picture)
that despite increasing pollution of the air filter engine performance, exhaust
quality and fuel consumption over a long period remain almost constant.
Only when a noticeable performance degradation occurs,
the air filter must be cleaned. So, very long working
intervals without maintenance are possible. (Similar to picture)
- Variable-displacement oil pump
![Picture](/uploads/3/4/3/2/34320369/_1519106.jpg)
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Variable-displacement oil pump
The exact chain oil output can be adjusted manually for varying conditions,
allowing for a reduction of up to 50%.
The exact chain oil output can be adjusted manually for varying conditions,
allowing for a reduction of up to 50%.
STIHL Ematic system:
![Picture](/uploads/3/4/3/2/34320369/7999865.jpg?163)
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Ematic chain lubrication system
The Ematic chain lubrication system ensures pinpoint lubrication of the saw chain
links and guide bar rails. When used with STIHL OILOMATIC saw chain, it will provide
maximum lubrication, longer wear and less oil consumption than conventional methods
of chain lubrication. The Ematic system can reduce bar oil consumption by up to 50%
The Ematic chain lubrication system ensures pinpoint lubrication of the saw chain
links and guide bar rails. When used with STIHL OILOMATIC saw chain, it will provide
maximum lubrication, longer wear and less oil consumption than conventional methods
of chain lubrication. The Ematic system can reduce bar oil consumption by up to 50%
_Lateral chain tensioning
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_Side chain tensioner
The tensioning screw can be found on the side of chain saw through the sprocket cover.
This removes the need for contact with the sharp saw chain.
(Similar to picture)
The tensioning screw can be found on the side of chain saw through the sprocket cover.
This removes the need for contact with the sharp saw chain.
(Similar to picture)
Single-lever operation:
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The functions of the machine, such as cold and warm startup,
operation and stop, are controlled by a single lever. This makes
the operation especially comfortable and safe, because the right hand
on the handle can remain. (Similar to picture)
operation and stop, are controlled by a single lever. This makes
the operation especially comfortable and safe, because the right hand
on the handle can remain. (Similar to picture)
Additional features
_STIHL ElastoStart
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_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.
(Similar to picture)
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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.
(Similar to picture)
More information