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.)
GUIDE BAR LENGTHS* (Recommended ranges) 40 to 50 cm (16" to 20")
FUEL CAPACITY 600 cc (20.3 oz.)
CHAIN OIL CAPACITY 350 cc (11.8 oz.)
OILOMATIC® CHAIN 3/8" RS3
POWER SOURCE Gas
STIHL recommends #3624 (33 RS3 72) OILOMATIC® saw chain and 20" 3003 008 8921 STIHL ROLLOMATIC® 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 depending upon which power head it is installed.
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
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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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    STIHL Pro Mark items are "Wash and Wear." They do not require dry cleaning as other brands do.

     

    Where this label appears, these garments have been Classified by UL® (Underwriter Laboratories Inc.) as chainsaw cut-retardent leg protection for all operators of Gasoline-Powered Chainsaws by using ASTM (American Society of Testing & Materials) F1414 Test Method and ASTM F1897 performance standard. See complete marking on the product.

     

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STIHL Dealer Days are Happening Now!

Rated 4.7 out of 5 by 134reviewers.
Rated 5 out of 5 by Awesome power. This is my first stihl product. I have owned many other brands husqvarna, poulan, and homelite. I must say this saw out powers much larger saws mentioned.i am very impressed with the power from idle to full rip. It has plenty of low and midrange power and not just top end like some saws. My brother ran my saw and went and bought one just like it. May 21, 2015
Rated 3 out of 5 by Burned up before the second tank of fuel was done I bought Stihl because I believe they build an excellent product. After having the first saw fail It seems it wasn't prepped properly by the original dealer. I was fortunate enough that STihl stood behind the product. When I got the new saw from the original dealer that seemed frustrated to have to deal with the warranty. I then took the new saw to another dealer and they showed me how the original unit like the new one wasn't to the spec that it should leave the factory at.The real problem is being a California customer we have poor alcohol based fuels and I think the tune from the factory just wasn't close enough for my environment. At last at a great dealer I love the new saw and would always buy Stihl again May 21, 2015
Rated 1 out of 5 by For at home use only I returned this saw due to it not being powerful enough for large pine here in Idaho and felt it was heavy for the power it had. I replaced it with the ms362 and I love the thing, recommend for homeowner use only not to be used on large wood. May 20, 2015
Rated 5 out of 5 by reliable, powerful, strong, awesome saw I have used this saw around my yard and it's a power house. The ms 391 is strong, powerful, and goes through wood with ease. Saves on fuel and time. It's nice to have a bigger saw when I am out cutting wood, because you don't know what you are going to run into, that a smaller saw cannot cut. Stay a way from the box store saws, they don't have the quality and reliability that Stihl has. May 8, 2015
Rated 5 out of 5 by Great farm saw I have owned a few Stihl saws and this is probably one of the best. I currently have a ms 270 and although a great saw, I needed something bigger as I had some very old and very large beech trees to fell. It was ideal, and made the job easy. May 6, 2015
Rated 5 out of 5 by THIS PRODUCT GETS THE JOB DONE! I purchased my MS 391 last summer and it has come in handy many times over. I needed a really good chain saw for multiple uses: farm, home, woods, etc., and it has not let me down. Whether it's cutting through big trees or small, I have yet to have any issues with it. Runs like a dream, not heavy, probably the best all around saw on the market in my opinion. I would even put it up against professional saws. I am more than impressed with this product. May 4, 2015
Rated 5 out of 5 by Love this saw Chews through wood like it isn't even there . Will tackle any job put in front of it with ease. April 27, 2015
Rated 5 out of 5 by Perfect saw for home owner who needs a bigger unit. A true work saw. Equipped unit with a 25" bar and skip chain and handles big tree rounds with ease. Found keeping bar oil topped off after monster cuts is a must. Love this saw! April 18, 2015
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