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.)
GUIDE BAR LENGTHS* (Recommended ranges) 40 to 50 cm (16" to 20")
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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    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

    3/8 PM
    5/32 4.0 0811 411 8091

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    5605 007 1027

    0.325 8.25 3/16 4.8 0811 412 8088

    5605 750 4328

    5605 007 1028

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    5605 007 1029

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    5605 007 1030

For Your Safety
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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
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Are you ready for a STIHL?

Rated 4.5 out of 5 by 192reviewers.
Rated 4 out of 5 by Great saw for average person I use this saw in conjunction with my MS170. This saw handles larger stuff quite well. I changed out to a full skip chain, and it made a huge difference. Plenty of power for typical light felling, and bucking work. I would highly recommend this saw. It starts easy, and I have yet to need to use the decompression valve. I rated it 4 stars across the board, because nothing is perfect. This saw has been pretty close though. October 17, 2016
Rated 4 out of 5 by easy to start muffler has been held on by wire but saw stihl works October 4, 2016
Rated 4 out of 5 by Good saw Kind of heavy, good power, needs to start easier. Fix your survey!!! October 3, 2016
Rated 1 out of 5 by Saw dead after 6 months of heavy use. Returned saw 2 times during the 6 month period. Last visit was told engine was scored, a rebuild would cost me the same amount of a new saw. I had owned a 290 before and that lasted years.Debating on going up on the model or switching to another manufacturer. October 3, 2016
Rated 1 out of 5 by Lots of Power .......until it dies 1 month after warranty expires Was really impressed with this saw when it was working! I went to start it the other day and it would not stay running so took it into the local dealer. They said it had grey "gunk" in the cylinder and that there was scoring on only the exhaust side of the piston. I only use the Stihl HP fuel mix and never messed with the tuning after I bought it. They think the bearings went out and said it would be cheaper to buy a new saw then to fix since warranty expired month ago. Ridiculous, I don't have unlimited $ to drop on a new saw every year. Won't buy Stihl again since this is second saw to die, first saw was a MS181 that had a lean seizure after 2 years yet I was running only the Stihl premix fuel in that saw. September 28, 2016
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
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