MS 391 - $569.95 DSRP


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 depending upon which powerhead it is installed.
Model Features
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    Built in the USA
    Indicates products that are built in the United States from domestic and foreign parts and components.

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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.

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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.

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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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    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.

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    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.
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    Chain Pitch File Diameter File Guide
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    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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    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.

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    Performance Forestry Boot

    Combine cut-resistant protection with comfort when you buy our STIHL performance forestry boot. Whether tackling tree removal or a tough landscaping job, this forestry boot will meet the demands of most any task. You’ll benefit from additional features like its well-padded steel toe cap, puncture resistant throughsole, and waterproof exterior. The insole and arch support systems were anatomically formed to provide maximum comfort, and the low-weight sole offers wear-resistant, nonslip traction. Stop by our STIHL showroom to check out what could be your next go-to work shoe.

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    Anti-Vibration Gloves
    Reduced vibration from handheld machines. Meets ISO 10819.1996 and ANSI S2.73 vibration standards TRM 72 and TRN 55.

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    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?

Rated 4.5 out of 5 by 187reviewers.
Rated 5 out of 5 by great saw plenty of power I bought this saw September 2015 to cut firewood, I cut approximately 2 tandem dump truck load of logs each year. never let me down, easy on fuel, plenty of power. the only problem is it is heavy. I opted for the 18" bar, so it cuts quick September 16, 2016
Rated 5 out of 5 by Very good My MS 391 is a very good chain saw. I think you could make it a little easier to start. It seems to be very easy to flood with the choke on full, then you have to wait for the fuel to evaporate or take the spark plug out, dump the access out. It has plenty of power for what I wanted it to do.All in all, it is the best chain saw I've ever used.Ed September 6, 2016
Rated 5 out of 5 by My product is awesome I like all the features I like my product a lot it has a lot of power and when I bought it the dealer was extremely helpful! August 24, 2016
Rated 5 out of 5 by Better than Husqajunk Four. It took for Husqajunk chainsaws to fell two trees in my backyard. Four because only the fourth one stayed running long enough to do the job. My new Husquavarna 562xp has 2 hours and 27 minutes on it, the microprocessor says so. I pull and pull and pull, it just doesn't like to start. Anyway, I went out and bought an ms391 out of pure frustration. Wow what a difference, pull it once with the choke on, and again at half-choke. Starts EVERY TIME. Then I bought a Stihl pole saw, it starts and runs like a dream. I'm a Stihl convert.I should mention I run only 100octane airplane fuel, highly recommend this. It doesn't degrade over time and it makes saws really rip August 19, 2016
Rated 5 out of 5 by Everthing i expected This saw with the 24" bar is everything I expected in a larger chainsaw. August 3, 2016
Rated 1 out of 5 by MS391 25" bar Hard to start, several repairs, engine blew up after 18 months. Currently looking to replace. When it did work it was wonderful. July 26, 2016
Rated 5 out of 5 by Love this saw Great all around saw!!! I have four saws and it's my giro saw for medium to heavy jobs. Plus it starts fast even in cold weather. July 9, 2016
Rated 5 out of 5 by Great saw I've had mine for over six years and closing in on the 1000 hour mark. Never even changed the oil yet no issues starts +40 to -40 never skips a beat bar finally died this year after 10+ chains on a 24" bar. New bar and back felling/bucking. Might even treat the ol girl to an oil change this year. When your felling around homes and structures you need a reliable saw and this beats my rancher out every time. June 14, 2016
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