MS 391 - $569.95 DSRP



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Our top-of-the-line chainsaw for farm and ranch.

With an advanced low-emission engine technology, the STIHL MS 391 mid-range chainsaw improves fuel efficiency by up to 20% compared to previous models. The new air filtration system requires fewer filter changes, allowing for longer run times. Improved fuel efficiency and fewer filter changes save you time and money.

Print Spec Sheets
MS 391 Specifications
DISPLACEMENT 64.1 cc (3.9 cu. in.)
ENGINE POWER 3.3 kW (4.4 bhp)
POWERHEAD WEIGHT 6.2 kg (13.67 Ibs.)
FUEL CAPACITY 600 cc (20.3 oz.)
CHAIN OIL CAPACITY 350 cc (11.8 oz.)
OILOMATIC® CHAIN 3/8" RS3
GUIDE BAR LENGTHS (Recommended ranges) 40 to 50 cm (16" to 20")
STIHL ROLLOMATIC®
POWER SOURCE Gas
STIHL recommends #3624 (33 RS3 72) OILOMATIC® saw chain and 20" 3003 008 8921 Ematic™ guide bar combination. The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.
Model Features
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    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.

    More Information

Standard Features
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    Common Features for Chainsaws
    View the features common to many STIHL chainsaws.
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    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.

    More Information

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    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.
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    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.
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    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.
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    Toolless fuel and oil caps with retainers
    Simply lift the lever and twist the caps to remove or tighten. There‘s no need to use a tool to tighten or loosen.

Important Information
WARNING! 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 (Q) 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.
* The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.
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. Learn More…
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.
Click to view the STIHL Limited Warranty Time Periods
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    Replacement latches and scabbard are available.

For Your Safety
  • Forestry Helmet System Zoom
    Forestry Helmet System
    Adjustable hearing protection. Epoxy-coated full face screen. Tough ABS hard hat meets ANSI Z89.1-2003 Type 1 Class G. All parts are replaceable.

Are You Ready for a STIHL?

MS 391 is rated 4.5 out of 5 by 261.
Rated 1 out of 5 by from Blown motor Bought saw in December, it's only been fueled with pure mix stihl gas already mixed. Had made 6 stump cuts, and maybe 8 other big cuts, started dogging them completely lost power. Took to dealer, they talked to stihl said jugs and piston bad needed rebuilt. Not warrantied..... How is that even possible. I have 12 year old saws that still run good , I keep very good care of my saws sand their operations. Totally switching after 20 years to husky
Date published: 2018-02-19
Rated 5 out of 5 by from The best saw I have owned! Some people complain a little on the weight of this saw but I don't have a problem with it and with a properly sharpened chain the weight of the saw does all the work. After I broke in the saw I used it to buck up a fir log that was 36 inches on the butt. The saw went through it like butter!
Date published: 2018-02-19
Rated 5 out of 5 by from Excellent The 391 Farm Boss head then more than reliable and dependable has plenty of power. I have a 25 inch bar on mine which is Max I believe but it's all the saw that I need and I tackle the task of trees that are 40 plus in diameter I would never go with another brand again which have always proving to be unreliable and pieces of ....!!!!
Date published: 2018-02-15
Rated 5 out of 5 by from Runs hard and cuts even even harder. Very pleased. Dads 038 mag was a heck of a saw. I loved that thing. Long sad story short she is still running but not on our farm. Picked this haus. Fired it up on 3 pulls (the way stihl should) had a BIG hickory down and my farm boss was too small. This hog ate that tree. So proud of my new saw and welcome it proudly to the stihl family in the barn. Thank you stihl for making a quality that I can count on.
Date published: 2018-02-11
Rated 5 out of 5 by from Beast! I purchased this Stihl MS391 based on the legendary Stihl name which is synonymous with reliability. I've had several other brand name saws that do some jobs, but I needed something bigger and more powerful to accommodate several projects that my smaller saws just couldn't handle. I've read several reviews on this saw and others and after owning my saw for a little over month, I just can't understand why there are so many reviews discounting this model saw. I have never had a problem getting my saw to fire up. First pull it burps in the choke full on position, after moving the choke lever to the warm engine start position, 2nd pull it's off and running. With this being said, I recently had an anterior cervical discectomy where 3 levels of my cervical spine were rebuilt including the removal and replacement of a crushed disc in my neck. The decompression valve used to help in the assistance of starting the saw makes my life much easier as I have found this feature makes this saw much easier start than my other big box store much smaller saws. This leads me to believe that problems that other users have experienced with starting this saw most likely is the result of operator malfunction as I doubt that Stihl would put out chainsaws that do not start for customers after they test start them at the factory before being shipped out.
Date published: 2018-02-07
Rated 5 out of 5 by from Great product This is a quality product, not the junk you find at the big box stores. After using some of the other chainsaws out there, I thought they were pretty sorry, then I bought the stihl ms391, & I knew right away it was a REAL saw that will last & not the typical disposable ones that are far too common. Stihl; keep it up, build quality products & you will always have my business.
Date published: 2018-02-06
Rated 5 out of 5 by from Great features I chainsaw is easy to use and to start. It zipped through a bridge bean in no time. Best purchase I ever made. I should have bought one a long time ago
Date published: 2018-02-05
Rated 5 out of 5 by from Great saw for the money. This saw cuts quick and easy. Only wish it could handle a 25" bar. I normally cut bigger trees and would like to put a bigger bar on the saw. Now I'm looking into a 261 professional saw. Which can handle a 25" bar, but has less cc.
Date published: 2018-02-04
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