MS 391 - $579.95 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
  • Zoom
    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
  • Zoom
    Common Features for Chainsaws
    View the features common to many STIHL chainsaws.
  • Zoom
    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

  • Zoom
    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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    STIHL recommends a mix of 50:1 high-quality 89 octane or higher unleaded gasoline to STIHL engine oil. This same mix ratio should be used during break-in.

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    Bar and Chain Oil
    STIHL Bar and Chain oil is formulated to adhere to the bar and chain, and to reduce wear. Special agents in the oil formulation help keep sap and pitch from clinging to the bar and chain.

    Available in quart and gallon bottles, 5 gallon pails and 55 gallon drums, in both summer and winter weights.

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  • Complete Filing Kits Zoom
    Complete Filing Kits
    Kits available for the following chain types: STIHL PICCO Mini; 1/4" pitch chain; .325" pitch chain; 3/8" pitch chain; .404" pitch chain.
    Includes file guide, depth gauge, round file, flat file and two file handles in tool pouch.
    Chain Pitch File Diameter File Guide
    Part Number
    Sharpening Kit
    Part Number
    in. mm in. mm Part Number
    3/8 PMN 9.32 5/32 4.0 0811 411 8073

    5605 750 4327

    5605 007 1026

    1/4
    3/8 PM
    6.35
    9.32
    5/32 4.0 0811 411 8091

    5605 750 4327

    5605 007 1027

    0.325 8.25 3/16 4.8 0811 412 8088

    5605 750 4328

    5605 007 1028

    3/8 9.32 13/64 5.2 0814 243 3384 5605 750 4329

    5605 007 1029

    0.404 10.26 7/32 5.5 0811 412 8108 5605 750 4330

    5605 007 1030

For Your Safety
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    Performance Zip Chap

    The Performance Series Zip Chaps provide full wrap-around protection for a user’s lower leg area and are made to stand up to daily wear and tear. The outer material is crafted from durable orange Cordura® nylon fabric, an all-weather material used in a range of premium outerwear brands. Inside, the chaps feature six layers of Avertic® Pro by Engtex® cut retardant material, designed to reduce the risk or severity of injury in the event of contact with the rotating saw chain on a gasoline-powered chainsaw. For extra convenience, the chaps feature rows of zippers that run along the entire inseam of the chap, helping to ensure a comfortable fit that is easy to put on and/or remove. Visit our Dealership to see these chaps in person.

  • STIHL Pro Mark™ Dynamic Protective Gloves Zoom
    STIHL Pro Mark™ Dynamic Protective Gloves
    Durable and hardworking, STIHL Pro Mark™ Dynamic Gloves deliver professional-grade hand protection. The palm and inner fingers are made of full grain tanned leather, so you can work with comfort without sacrificing a firm hold. Featuring multiple layers of cut-retardant materials – Avertic Pro and Dyneema fabrics by Engtex® – these gloves will help deliver protection without compromising the dexterity you need while operating a chainsaw. Accented with an orange rip-stop nylon backing, these dynamic gloves offer style and protection. Water repellant, breathable and featuring a Velcro wrist closure, STIHL Pro Mark™ Dynamic Gloves are as ready for the woods as you.
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    Forestry Helmet System
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Are You Ready for a STIHL?

MS 391 is rated 4.5 out of 5 by 259.
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
Rated 5 out of 5 by from Great saw. I have had my saw about 12 years. I loved its easy to start, well running engine and the absorption dampening. Over the last 5 or so years I started purchasing "parts" 440 saws off of ebay and rebuilding them. None of my rebuilt saws run as superior as this 391. I had a three day yard clearing project and this saw still exceeds my expectations. Even after 12 years this started effortlessly and wound run all day.
Date published: 2018-01-15
Rated 5 out of 5 by from Excellent power After owning a few lower grade less powerful saws this was my first jump to a "big boy" saw. I generally use it for cutting large loads of firewood for heating in the winter. My only disappointment came on the first start. I got it home and after a few pulls it flooded quickly and was done for in further attempts. Took it to the dealer who replaced the plug and explained sometimes the first start is rough due to oils used in manufacturing. Home again started on 3 pulls and ran it without load for 5 minutes (burns off oils from manufacturing) after that in the timber 2-3 pulls cold and one quick one when warm and it starts right up. Saw has plentiful power cutting through anything I find and good reliability. Watch the chain, it warms up quick and gets loose, don't let it slip. Other than that a great saw, very pleased with the bang for my buck.
Date published: 2018-01-14
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