MS 391 - $549.95 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 based on which powerhead it is installed on.
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

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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: Cancer and Reproductive Harm - www.p65warnings.ca.gov
ADVERTENCIA: Cáncer y Daño Reproductivo - www.p65warnings.ca.gov
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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    Replacement latches and scabbard are available.

  • Complete Filing Kits Zoom
    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.
    Includes file guide, depth gauge, round file, flat file and two file handles in tool pouch.
    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
  • Performance Zip Chaps - 6 Layer Zoom
    Performance Zip Chaps - 6 Layer

    The Performance Zip Chaps - 6 Layer provides a 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.

  • STIHL Pro Mark™ Dynamic Protective Gloves Zoom
    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.
  • Two-Tone Work Glasses Zoom
    Two-Tone Work Glasses
    The lightweight STIHL Two-Tone Work Glasses feature a hollowed-out framework that is lightweight and comfortable to wear. Protect your eyes with ANSI standard Z87.1+ lenses, offering 99% UV protection – so you don’t have to slow down when the sun is beating down. Featuring flexible rubber temple tips and nose pads, the STIHL Two-Tone Work Glasses deliver a soft, comfortable fit for all those tough outdoor tasks that demand your full attention. Stop by our showroom to see them for yourself!
  • Forestry Helmet System Zoom
    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 4.5 out of 5 by 292.
Rated 5 out of 5 by from Excellent Saw Have 4 others but needed to step up to a saw that will do everything that I want it to do, so far so good, may need a bigger one, you never know.
Date published: 2018-07-16
Rated 5 out of 5 by from Great saw for the price It a great saw for the price, I've only had the saw for two weeks and have ran a few tanks through it. Immediately noticed the small felling dogs weren't cutting it. Ordered larger dogs asap had them in a couple days. Also could use 1/4 turn clips for filter/carb access. Other then that like I said for the price and how well it runs I love the saw.
Date published: 2018-07-06
Rated 5 out of 5 by from Good for the money If you know how to start a saw without flooding it, this saw will start easy. I’ve had no problems starting this saw, from dead cold, in less than a minute. I am particular when using two cycle mix. I use Stihl HD and Stihl bar oil. My only issue with the MS391 are the baby dogs on one side only!! Why? I’ve upgraded to bigger felling dogs on both sides of the bar. This will give you a better, straighter cut. I use 046 and 461 at work and I love the quick access to the air filter. The MS391 uses a star wrench to remove the cover to access anything under it. Simply annoying. Overall, great saw and great power for the money. I look forward to owning this for at least ten years
Date published: 2018-06-13
Rated 5 out of 5 by from Great saw, looking forward to using it for years to come. I had never used a Stihl chainsaw before even though i have used saws for over 30 years. I have mostly used another brand before this that was a pro level saw, really heavy and hard to crank. This saw is really close to the performance of that saw and in a much lighter package. I've never used a saw of this size range that would run this long on a tank of fuel. I've so far in the first couple weeks cut up 3 big Hickory trees, 2 big white oaks, 1 large Pine and a couple junk trees that i'm not sure what they are. It runs great, I feel it's at or just below the bottom level of the pro saws.
Date published: 2018-06-12
Rated 5 out of 5 by from Good dependable saw I have used many saws from all different makes and models and this saw, the MS 391, is by far the best one I’ve owned. Fires right up every time. If properly maintained it will cut any size tree like butter. Couldn’t ask for anything better.
Date published: 2018-06-10
Rated 1 out of 5 by from Went through 2 in 3 months...Stihl will not stand behind their product Upgraded to a Stihl MS391 due to recommendations from past users. The 1st saw blew it's engine after an hour of use. All guidelines were followed including using Stihl oil and high octane gas. Dealer analysis showed that the piston housing was leaking air by the cylinder where it is fused together. I was given a new saw under warranty. The second saw lasted a month and a half and the same malfunction occurred. An air leak in the exact same place caused the engine to blow. This time the stihl reginal distributor told our sales individual that we ran it with to dull of a chain and caused the issue. I asked the them to have the regional person to call me and give me actual proof of this and did not receive a call. After pursuing a credit care dispute, I was given a refund. The regional guys name I believe was Simon. I also had 2 chains in another Stihl distributor shop for sharpening and was told they were not in need since they were not dull yet. This proves I change my chains more often than needed and never run the saw with a dull chain. Also my bar had no burn marks which occurs when a dull chain is used.I feel that Stihl has quality issues and that they do not want to admit. I think they hide behind the customer abuse excuse to hide their quality issues not honor their warranty.
Date published: 2018-05-30
Rated 4 out of 5 by from Great saw and great buy I got the ms391 love the saw great power not heavy at all. Very happy with it. The only downside I saw to the saw is it is hard to start. Don’t know if it me or the saw. Other then that I would recommend the ms391 to anyone you will not be disappointed. Keep up the great work Stihl
Date published: 2018-05-25
Rated 5 out of 5 by from Cuts very well. Smooth running, powerful. I'm pleased so far. The best chainsaw I've ever used, hand down. There is no substitute for a stihl.
Date published: 2018-05-19
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