MS 391

• 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.
• Specifications

  POWER SOURCE	Gas
  POWERHEAD WEIGHT	13.67 lbs.
  GUIDE BAR LENGTH (Recommended)	20 in.
  OILOMATIC® CHAIN	3/8" RS3
  CHAIN OIL CAPACITY	11.8 oz.
  ENGINE POWER	4.4 bhp
  FUEL CAPACITY	20.3 oz.
  DISPLACEMENT	64.1 cc

  Note: STIHL recommends #3624 (33 RS3 72) OILOMATIC® saw chain and 20" 3003 008 8921 Ematic™ guide bar combination. Compatible guide bar ranges: 16" to 20"
• Questions and Answers
• Reviews
• Warnings and Safety
  Note: STIHL recommends use of fuel with no more than 10% Ethanol content. Using fuel with greater than 10% Ethanol content may cause damage to your equipment and may void your STIHL warranty.

  * The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.

  IMPORTANT SAFETY INFORMATION The occurrence called “kickback” can cause serious or fatal injury. Always read the instruction manual carefully before using your saw. STIHL uses a green and yellow color-coding system to help you select a powerhead, bar and chain combination that complies with the kickback requirements of ANSI Standard B175.1 (gasoline-powered saws) and §30 of UL 1662/ ANSI Standard B175.1 (electric chainsaws). Ask your STIHL dealer about safe operating procedures and the advantages of the STIHL Quickstop® chain brake, STIHL Quickstop® Plus additional chain braking feature, STIHL reduced kickback bars and STIHL low-kickback saw chains.
  
  STIHL recommends the use of green reduced kickback bars and green low kickback chains on all STIHL chainsaws.

  

  WARNING! Improper use of any power tool may cause serious or fatal injury. Read, understand, and follow carefully the operating and safety instructions in your instruction manual before using such products.
  
  STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.

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