MS 391 - $579.95 DSRP


Reserve Now for In-store Pick Up

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.)
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
  • Zoom
    Built in the USA
    Indicates products that are built in the United States from domestic and foreign parts and components.

    More Information

  • 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 Chain Saws
    View the features common to many STIHL chain saws.
  • 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.
  • Zoom
    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.
  • Zoom
    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.
  • Zoom
    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 chain saws). Ask your STIHL dealer about safe operating procedures and the advantages of the STIHL Quickstop® chain brake, STIHL Quickstop® Plus additional chain braking feature (Q), 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 chain saws.
* 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
We Also Suggest
  • HP Ultra 2-Cycle Engine Oil Zoom
    HP Ultra 2-Cycle Engine Oil
    HP Ultra is a fully synthetic 2-cycle engine oil specially suited for high performance chainsaws and power tools. This oil has outstanding engine cleaning characteristics, plus “ultra” superior lubricating qualities in comparison to other 2-cycle engine oils. It is ideal for use in STIHL 4-MIX® engines. This oil is biodegradable, degrading by 80% in 21 days.

    •2.6 oz. bottle makes 1 gallon mix

    •5.2 oz. bottle makes 2 gallon mix

    •6.4 oz. bottle makes 2 1/2 gallon mix

    •12.8 oz. bottle makes 5 gallon mix

    STIHL recommends a mix of 50:1 high-quality 89 octane or higher unleaded gasoline to STIHL engine oil. This same mix ratio should be used during break-in.

  • Bar and Chain Oil Zoom
    Bar and Chain Oil
    STIHL Bar and Chain oil is formulated to adhere to the bar and chain, and to reduce wear. Special agents in the oil formulation help keep sap and pitch from clinging to the bar and chain.

    Available in quart and gallon bottles, 5 gallon pails and 55 gallon drums, in both summer and winter weights.

  • Woodsman Chainsaw Carrying Case Zoom
    Woodsman Chainsaw Carrying Case
    Woodsman carrying case. Unique, removable bar scabbard has built-in tool holders to carry tools to the cutting site. Fits MS 170 to MS 460 M with 20" bar.

    Replacement latches and scabbard are available.

  • Complete Filing Kits Zoom
    Complete Filing Kits
    Kits available for the following chain types: STIHL PICCOTM 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

    3/8 PM
    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
  • Pro Mark™ Apron Chaps Zoom
    Pro Mark™ Apron Chaps
    Rugged, yet comfortable, apron-style chaps are treated with water and oil resistant nylon covering multiple layers of Avertic™ Pro by Engtex® sewn-in, cut-retardant material. Garments are easy to buckle on and can be adjusted to fit a variety of sizes. Cargo pocket on front. Waist size expands from 30" to 42". For Proper fit and protection, the chap length should extend below the calf of the wearer's leg. Larger waists can be accommodated with the waist extender strap (Part No. 0000 886 5901)

    STIHL Pro Mark items are "Wash and Wear." They do not require dry cleaning as other brands do.


    UL Classified 6F63Where 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.


  • STIHL® Forestry Helmet System Zoom
    STIHL® 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.
  • Cut-Retardant Gloves Zoom
    Cut-Retardant Gloves
    Made with water-resistant nylon backs and goatskin palms for comfort and a better grip without sacrificing dexterity. Avertic™ Pro by Engtex® cut-retardant material sewn into back of left glove. High-visibility orange color, separate index finger, and hook and loop wrist straps make these three-fingered chainsaw protective gloves an excellent choice for the professional logger. Sizes available: S (8), M (9), L (10), XL (11).

Are you ready for a STIHL?

Rated 4.8 out of 5 by 119reviewers.
Rated 5 out of 5 by High quality, hard-working saw I replaced a good MS 290 with this 391 as I had some larger trees coming up and my old right arm objected to the high compression cranking of the 290. I follow timber harvest cutting and use the tops for firewood, so a lot of the material is 10 to 20 inches in diameter. I also use a Stihl 260 with a 16" bar for the smaller limbs. I have both 20 and 24 inch bars for the 391 and the balance seems much better with the 20" bar. No problem with power for the longer bar, though.The saw is heavy if you are trying to cut small limbs and branches. It is made for larger material where the weight can work for you. If you are trying to decide between the pro 362 and the 391, the pro saw does have a pound advantage (less weight) as far as the power head goes. Also, the price difference between the two saws is not as much as it once was. Add the M-tronic carb system and you may want to give the more expensive 362 some serious consideration.Some have complained about the 391 being hard to start. I've not had too much difficultiy starting it as long as I catch the first "burp" and move the control lever to the partial choke level. It is easy to flood if you miss this first hit.The AV system is a great improvement over the older 290 model.I've used Stihl HP Ultra oil and non-ethanol fuel mix with good results.I've also found that keeping the chain sharp will throw chips not dust and the air filter stays cleaner. Howerer, don't neglect checking and cleaning the air filter.My 391 is about a year and a half old now and it is really a great tool. With over 100 reviews on line, about all has been said about it that can be said, but you won't go wrong with the MS 391. February 17, 2015
Rated 5 out of 5 by Great power and effecent This saw is great.I was looking for a new saw and wanted a 25"bar.Picked this one up and haven't been disappointed. Lots of power and it rips through the logs.:-) February 16, 2015
Rated 5 out of 5 by great on gas cutting machine well balance great handle vibration control Had a farm boss ms290 cut 11 cord for outdoor wood boiler.Still have the saw used now has a limb trimmer.Upgraded to a ms391 what a machine.Save time and fuel.That 3/8 chain made a big difference.All I can say I have gone from a chevtte to a cadillac. Great saw, it will work that winter fat right off you. February 14, 2015
Rated 5 out of 5 by Effortless Cutting Santa brought new 391 and safety chaps and helmet/ear muffs/ faceshield. Used first time mid Feb. Cut like butter, no strain, easy. Bought more than enough and glad I have the extra power.Don't buy too small. February 12, 2015
Rated 5 out of 5 by Power, dependability and effecent I was looking for a new saw that I wanted to replace my old red saw. I looked at the Red ones and Orange ones. I noticed that the reviews showed a lot of flaws. I looked to STIHL knowing the saws were going to be a little more money, but heck if I only have to buy one saw for the next 20 years it should be worth it. I found it in this package. I was surprised at how easy the saw is on fuel and oil. I have a 20" Bar and cut all my own firewood as well as clean up trees on my land. No problems cutting through big trees. I will warn you, its not the lightest saw on the market, but as far as I am concerned one of the best.I am submitting this review after a year of using this product. February 12, 2015
Rated 5 out of 5 by Great power This saw is awesome. It has great power. I have a 20 inch bar and was using all of it. It almost cut's to fast for me.Had to get use to it. I'm use to using a 029. Also bought the chaps and glad I did. February 8, 2015
Rated 5 out of 5 by Great saw for the wooded acreage I live on Wonderful saw!!! Upgraded from a 16" husqv. Wow! What a difference more horsepower makes, and a bigger cutting edge on the saw. I use the 20" bar, 3/8" chain, rips thru logs with ease. Very glad I spent the extra money for this versus the 291 and the 311. January 29, 2015
Rated 4 out of 5 by Good, not great I got this to replace my old 038M. Once I get it running, it cuts well and does everything I expect it to. The hard part is getting it going. The dealer taught me the specific steps to start it and you MUST follow those steps exactly including the exact number of pulls on full choke. Any deviation from those steps results in flooding and a tedious procedure to restart. It has gotten better after several tanks of fuel. January 27, 2015
2 3 4 5next>>