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 depending upon which powerhead it is installed.
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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    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
    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.

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    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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Are You Ready for a STIHL?

MS 391 is rated 4.5 out of 5 by 247.
Rated 5 out of 5 by from Great, powerful saw! Takes the "work" out of felling trees!! Upgraded to this saw from a smaller, lesser brand a few years back. I LOVE cutting with this saw. A true powerhouse. I burn wood all winter, so this saw gets used often throughout the year. I'm particular about keeping it sharp, and have provided many first hand lessons to cutting buddies on the difference between a sharp saw and a dull saw. I've made plenty of friends envious of the cutting power of this beast. The chain sometimes(not very often) bogs, but likely cause I get antsy and start pushing too hard. I've never regretted paying what I did for this saw. I have a 16" bar I use when I'm doing quick limbing or cutting up a felled tree. The 20" stays on mostly for felling the big oaks around my property. The MS391 is a fantastic tool for any homeowner that wants a truly enjoyable tool.
Date published: 2017-11-02
Rated 1 out of 5 by from Unreliable Purchased this saw and drove 50 miles to do a job and the saw won't start. Take it back to the store and they finally get it to start. Drive back to the job the next week and after a few cuts, the chain comes off and I am unable to re-install it. Back to the store again and they tell me the chain is damaged. I believe the fault might be a defective bar. Waiting to hear back from the store. I have had much cheaper saws that were better than this.
Date published: 2017-10-30
Rated 5 out of 5 by from ms391 i'm i love with this saw i love this saw from the beginning. I have always owned cheap saws until now. it has to be started with a routine, but that's ok. it starts for me every time. it pulls like heck though oak and hickory on my 11 acres. this is the most amazing saw for me. reliablepowerfulfast cuttingeasy starting for me.
Date published: 2017-10-24
Rated 5 out of 5 by from Farm Chain Saw I live on a farm with 20 acres of woods and big old hardwood trees. When they come down the Stihl MS 391 has plenty of power to cut these up. Even with a 25" bar some of these need to be cut from both sides to get through them. This machine has enough power to chew through tough oak using the full length of the bar. It starts easy enough for a saw of this size. The decompression button makes starting much easier. I'm very happy with this saw.
Date published: 2017-10-02
Rated 5 out of 5 by from Easily fell the largest trees I've ever sawed Starts on the first pull and runs great. I just cut down several large poplars that were easily the largest trees I've ever fell. I've got a 25-inch bar on mine and it's had no problem tackling whatever I throw at it. Just know that handling this saw for hours will ware you out. It's extremely powerful and is not for the faint of heart or a beginner. Highly recommend for anyone who has very large trees to remove.
Date published: 2017-09-25
Rated 5 out of 5 by from This saw lives up to my expectations, I have been a chain saw user since the 1960's And a stihl saw user since the late 1960's. Starts easy, adequate power for my use, easy maintenance, and dependable.
Date published: 2017-09-20
Rated 5 out of 5 by from Well thought out design. This saw has many little features that make it very user friendly and easy to maintain. From the single control lever for starting and running, to the laser etched reference guides on the chain, and the air bypass for preheated air for cold operating temperatures. I have blocked 20+ cords of pine with this saw so far and I have had no issues to date.
Date published: 2017-09-06
Rated 5 out of 5 by from Excellent saw in every way. Starts right-a-way every time, cuts fast and clean, well balanced, easy access for maintenance and cleaning. I mainly cut 16 to 24 inch pine logs and the saw cuts through quickly without bogging.I highly recommend the MS391.Mike
Date published: 2017-07-14
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