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 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.

    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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    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

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    Performance Forestry Boot

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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?

MS 391 is rated 4.4 out of 5 by 8617.
Rated 5 out of 5 by from Best saw I've owned The MS391 has impressed me immensely! Stihl had done a great job packing this much power in the saw. Wow. I've paired it up to Husqvarnas of equal stats on paper and the 391 blows them away. Stihl is the only way to go, and this MS391 is the best for my ranch. Now to find somewhere close to me that sells full-skip chains!
Date published: 2016-11-21
Rated 1 out of 5 by from POWERHEAD SIEZED 9 DAYS AFTER WARRANTY MS391 along with the case of premixed fuel. never had a problem starting. Today I dropped a an 18 inch walnut and noticed the power head was smoking. I reached to pull the start lever and it seized up. I let the machine cool for awhile which I assume did not take long since it's 35 degrees here. Still no luck. So I spent a lot of money for something that performed well for awhile. I used duratac chain oil and the manufacturers gas. I still have 2 cans left! Now the warranty is up and I'm sure as not going to spend this much money on something that lasts under one year. The issue for me is this happened 5 days after the 1 year warranty ended. This is not my grandfathers engine company.
Date published: 2016-11-21
Rated 2 out of 5 by from No lie, my brand new Stihl left me high and dry out in the field on the first day on the first tank However I will continue to outfit my company with Sthl equipment, my problem with Stihl and every other manufacturer is that cheaper metal and plastics have taken the place of reliable, heavy duty metal parts. Two weeks ago I purchased my newest Stihl chainsaw to replace my 310 that needed some more shop time. Out in the field on my first tank of gas on my first chain re-tightening, while attempting to tighten the brand new chain on it's maiden voyage one of the tabs broke off the chain tightening mechanism and with no way to tighten the chain I was done for the day.When I returned the saw for repair I was informed that my (less than 24 hours old) new Stihl would not be covered under warranty and in fact I would not only pay for the parts and the labor but shipping as well.If this true story doesn't compel your company to strive for better customer service for its long standing customer base, I don't know what will.Long time customer,Scott Carpenter
Date published: 2016-11-17
Rated 5 out of 5 by from Tuff saw I run an Excavating business sometimes I get Into brush jobs where i need a bigger saw.I had a farm boss I thought it was tuff until I bought this thing. With a 20 inch bar it's hard To pull this saw down. Cuts twice as good as farm boss does. Eats hard wood up like candy.
Date published: 2016-11-16
Rated 5 out of 5 by from Good dependable saw Start's up fast and easy every time. runs great. good powerful fast cutting saw for fire wood i also have a 460. And a 660. For every day jobs but when i bought a cabin and started cutting fire wood i want something with a little less weight and a shorter bar so its a excellent saw for the job love it and all my sthil products
Date published: 2016-11-14
Rated 5 out of 5 by from has good power for its size I used to fall trees for a living I have 2 stihl 391. I worked them 10 hours a day 5 days a week never had any problems with them starting one of them worked after having a big tree fall on it
Date published: 2016-11-13
Rated 5 out of 5 by from Great all around saw I bought this saw for home firewood cutting and property maintenance . Saw has great power with a 20" bar on it and runs even better cutting bigger stuff with a half skip chain. Installed some real dogs because the little ones that come on it are worthless. (My only complaint) --helps with bucking logs. "Stihl the best" is a worthy saying.
Date published: 2016-11-03
Rated 5 out of 5 by from Lots of power and light enough for east handling, great product support , can be a little sensitive to flooding The 391 seems very well made. It handles beautifully with lots of power for large diameter and hard wood. Its light enough for sustained day-long cutting. Mine is fairly sensitive to flooding during starts - just takes getting used to each others little idiosyncrasies. I definitely recommend this saw for fairly heavy usage.
Date published: 2016-11-02
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