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Stihl MS 391 20 in.
Stihl MS 391 20 in.

Specs

General Information

Manufacturer
Stihl
Stihl
Model
MS 391 20 in.
MS 391 20 in.
Model Code
11402000591
11402000591
Color
Orange / White
Orange / White

Dimensions

Weight
Powerhead - 13.67 lb.
Powerhead - 13.67 lb.

Engine

Engine
Power Source - Gas
Power Source - Gas
Horsepower
4.4 bhp
4.4 bhp
Displacement
64.1 cc
64.1 cc
Fuel Type
Gas
Gas
Fuel Tank Capacity
20.3 oz.
20.3 oz.
Oil Capacity
Chain - 11.8 oz.
Chain - 11.8 oz.

Operational

Chain

OILOMATIC® 33 RS3

Pitch - 3/8 in.

Gauge - 0.050 in.

OILOMATIC® 33 RS3

Pitch - 3/8 in.

Gauge - 0.050 in.

Guide Bars
Length (Recommended) - 20 in. 8921
Length (Recommended) - 20 in. 8921

Other

Miscellaneous
Note: STIHL recommends #3624 (33 RS3 72) OILOMATIC® saw chain and 20 in. 3003 008 8921 Ematic™ guide bar combination. Compatible guide bar ranges: 16 in. to 20 in.
Note: STIHL recommends #3624 (33 RS3 72) OILOMATIC® saw chain and 20 in. 3003 008 8921 Ematic™ guide bar combination. Compatible guide bar ranges: 16 in. to 20 in.

Features

Features

  • REDUCED-EMISSION ENGINE TECHNOLOGY - CARING FOR NATURE: The STIHL Inc. “Caring for Nature” seal identifies its powered products that are more environmentally conscious, producing zero or low exhaust emissions. STIHL Inc. defines “low exhaust emissions” as being cleaner than EPA and/or CARB exhaust emission standards.
  • PRE-SEPARATION AIR FILTRATION SYSTEM: This time-saving technology boosts the efficiency of the engine’s filter system, doubling the time between air filter cleanings. Air drawn into the engine is first separated via centrifugal force, ejecting the heavier dirt particles before being routed to the air filter. This pre-separation means less dirt to be captured by the air filter, resulting in less frequent cleaning and maintenance.
  • ANTI-VIBRATION SYSTEM: STIHL has developed a system for minimizing the vibration levels of handheld outdoor power equipment. The STIHL anti-vibration system helps reduce operator fatigue and provides a more comfortable working experience.
  • INTELLICARB™ COMPENSATING CARBURETOR: The IntelliCarb™ Compensating Carburetor is designed to automatically adjust the air/fuel ratio when the air filter becomes restricted or partially clogged and maintains the engine’s correct RPM. IntelliCarb™ uses air from the clean side of the air filter to control the diaphragm and flow of fuel. As the air filter becomes dirty and less air is available for the carburetor, the IntelliCarb™ system adjusts the fuel flow to compensate for the decrease in air flow. This is in contrast to typical carburetors that utilize this air from the “dirty” side of the air box.
  • SIDE-ACCESS CHAIN TENSIONER: The side-access chain tensioner makes it much more convenient for the user to adjust the saw chain with a bar wrench as opposed to the typical location of the guide bar adjustment screw.

Features

  • REDUCED-EMISSION ENGINE TECHNOLOGY - CARING FOR NATURE: The STIHL Inc. “Caring for Nature” seal identifies its powered products that are more environmentally conscious, producing zero or low exhaust emissions. STIHL Inc. defines “low exhaust emissions” as being cleaner than EPA and/or CARB exhaust emission standards.
  • PRE-SEPARATION AIR FILTRATION SYSTEM: This time-saving technology boosts the efficiency of the engine’s filter system, doubling the time between air filter cleanings. Air drawn into the engine is first separated via centrifugal force, ejecting the heavier dirt particles before being routed to the air filter. This pre-separation means less dirt to be captured by the air filter, resulting in less frequent cleaning and maintenance.
  • ANTI-VIBRATION SYSTEM: STIHL has developed a system for minimizing the vibration levels of handheld outdoor power equipment. The STIHL anti-vibration system helps reduce operator fatigue and provides a more comfortable working experience.
  • INTELLICARB™ COMPENSATING CARBURETOR: The IntelliCarb™ Compensating Carburetor is designed to automatically adjust the air/fuel ratio when the air filter becomes restricted or partially clogged and maintains the engine’s correct RPM. IntelliCarb™ uses air from the clean side of the air filter to control the diaphragm and flow of fuel. As the air filter becomes dirty and less air is available for the carburetor, the IntelliCarb™ system adjusts the fuel flow to compensate for the decrease in air flow. This is in contrast to typical carburetors that utilize this air from the “dirty” side of the air box.
  • SIDE-ACCESS CHAIN TENSIONER: The side-access chain tensioner makes it much more convenient for the user to adjust the saw chain with a bar wrench as opposed to the typical location of the guide bar adjustment screw.