MS 391 - $559.95 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

  • 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.
  • 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.
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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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    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.

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  • 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.
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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 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.

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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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STIHL Dealer Days are Happening Now!

MS 391 is rated 4.5 out of 5 by 274.
Rated 5 out of 5 by from Best chainsaw ever had! Love this chainsaw, had several but none compared to the MS391. Lots of power, easy to use. 20in bar, I’ve cut 24in across oaks like butter. Do get the 2 in 1 file, to keep teeth sharp, you won’t have any problems.
Date published: 2018-03-09
Rated 1 out of 5 by from Stihl will not honor their warrenty Less than 90 days after purchasing a new ms391 the clutch let go. stihl would not honor their warrantee. I was told that is was caused by me running the saw with the brake on, or a really dull chain. Both of which are wrong. If it were possible to run the saw with the brake engaged, that doesn't say much about their saw brakes.
Date published: 2018-03-05
Rated 5 out of 5 by from Exactly what I have come to expect from Stihl This is my 3rd Stihl Chainsaw. I have an O41 Farmboss, an O36 and now an MS391. I have to say that this saw is impressive. It handles like my O36, but cuts like the O41. Plenty of power for a 20" bar, so if it is like the O41 it would probably handle the 24" like it wasn't even there. To be honest, I had to hold it back as it was almost too aggressive. Easy to start like all of my saws. Very well worth the money.
Date published: 2018-03-02
Rated 5 out of 5 by from This saw is a workhorse The 391 is a good priced saw with plenty of power. Power to weight ratio is great.
Date published: 2018-03-01
Rated 4 out of 5 by from Great Product Great saw, I have been very pleased so far. More importantly I was very pleased with the customer service and professionalism of the crew at Mountain Stihl in Helena, MT.
Date published: 2018-02-28
Rated 1 out of 5 by from Blown motor Bought saw in December, it's only been fueled with pure mix stihl gas already mixed. Had made 6 stump cuts, and maybe 8 other big cuts, started dogging them completely lost power. Took to dealer, they talked to stihl said jugs and piston bad needed rebuilt. Not warrantied..... How is that even possible. I have 12 year old saws that still run good , I keep very good care of my saws sand their operations. Totally switching after 20 years to husky
Date published: 2018-02-19
Rated 5 out of 5 by from The best saw I have owned! Some people complain a little on the weight of this saw but I don't have a problem with it and with a properly sharpened chain the weight of the saw does all the work. After I broke in the saw I used it to buck up a fir log that was 36 inches on the butt. The saw went through it like butter!
Date published: 2018-02-19
Rated 5 out of 5 by from Excellent The 391 Farm Boss head then more than reliable and dependable has plenty of power. I have a 25 inch bar on mine which is Max I believe but it's all the saw that I need and I tackle the task of trees that are 40 plus in diameter I would never go with another brand again which have always proving to be unreliable and pieces of ....!!!!
Date published: 2018-02-15
Rated 5 out of 5 by from Runs hard and cuts even even harder. Very pleased. Dads 038 mag was a heck of a saw. I loved that thing. Long sad story short she is still running but not on our farm. Picked this haus. Fired it up on 3 pulls (the way stihl should) had a BIG hickory down and my farm boss was too small. This hog ate that tree. So proud of my new saw and welcome it proudly to the stihl family in the barn. Thank you stihl for making a quality that I can count on.
Date published: 2018-02-11
Rated 5 out of 5 by from Beast! I purchased this Stihl MS391 based on the legendary Stihl name which is synonymous with reliability. I've had several other brand name saws that do some jobs, but I needed something bigger and more powerful to accommodate several projects that my smaller saws just couldn't handle. I've read several reviews on this saw and others and after owning my saw for a little over month, I just can't understand why there are so many reviews discounting this model saw. I have never had a problem getting my saw to fire up. First pull it burps in the choke full on position, after moving the choke lever to the warm engine start position, 2nd pull it's off and running. With this being said, I recently had an anterior cervical discectomy where 3 levels of my cervical spine were rebuilt including the removal and replacement of a crushed disc in my neck. The decompression valve used to help in the assistance of starting the saw makes my life much easier as I have found this feature makes this saw much easier start than my other big box store much smaller saws. This leads me to believe that problems that other users have experienced with starting this saw most likely is the result of operator malfunction as I doubt that Stihl would put out chainsaws that do not start for customers after they test start them at the factory before being shipped out.
Date published: 2018-02-07
Rated 5 out of 5 by from Great product This is a quality product, not the junk you find at the big box stores. After using some of the other chainsaws out there, I thought they were pretty sorry, then I bought the stihl ms391, & I knew right away it was a REAL saw that will last & not the typical disposable ones that are far too common. Stihl; keep it up, build quality products & you will always have my business.
Date published: 2018-02-06
Rated 5 out of 5 by from Great features I chainsaw is easy to use and to start. It zipped through a bridge bean in no time. Best purchase I ever made. I should have bought one a long time ago
Date published: 2018-02-05
Rated 5 out of 5 by from Great saw for the money. This saw cuts quick and easy. Only wish it could handle a 25" bar. I normally cut bigger trees and would like to put a bigger bar on the saw. Now I'm looking into a 261 professional saw. Which can handle a 25" bar, but has less cc.
Date published: 2018-02-04
Rated 5 out of 5 by from Great saw. I have had my saw about 12 years. I loved its easy to start, well running engine and the absorption dampening. Over the last 5 or so years I started purchasing "parts" 440 saws off of ebay and rebuilding them. None of my rebuilt saws run as superior as this 391. I had a three day yard clearing project and this saw still exceeds my expectations. Even after 12 years this started effortlessly and wound run all day.
Date published: 2018-01-15
Rated 5 out of 5 by from Excellent power After owning a few lower grade less powerful saws this was my first jump to a "big boy" saw. I generally use it for cutting large loads of firewood for heating in the winter. My only disappointment came on the first start. I got it home and after a few pulls it flooded quickly and was done for in further attempts. Took it to the dealer who replaced the plug and explained sometimes the first start is rough due to oils used in manufacturing. Home again started on 3 pulls and ran it without load for 5 minutes (burns off oils from manufacturing) after that in the timber 2-3 pulls cold and one quick one when warm and it starts right up. Saw has plentiful power cutting through anything I find and good reliability. Watch the chain, it warms up quick and gets loose, don't let it slip. Other than that a great saw, very pleased with the bang for my buck.
Date published: 2018-01-14
Rated 3 out of 5 by from This saw has ample power. Instruction manual is not very helpful in regards to starting the saw. My saw does not start if it has not been used for a few days if you follow the directions in the manual. Very hard saw to start, generally always floods.Would prefer the old style caps for fuel and oil.
Date published: 2017-12-27
Rated 5 out of 5 by from Great product I bought this saw to run a 25In bar to do some logging on the farms we lease saw works great cuts good we have been sawing 20+ inch oak logs every few days with the saw not as bad on gas as I thought it would be either looking at buying another larger saw in the near future
Date published: 2017-12-26
Rated 5 out of 5 by from Great machine. After purchasing several inferior products, a friend of mine let me borrow his Farm Boss, I was totally impressed. Since I have a lot of hardwood on the property, I purchased this saw and it works phenomenal.
Date published: 2017-11-25
Rated 4 out of 5 by from Ms391 Great for firewood cutting reliable powerful easy to maintain
Date published: 2017-11-19
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
Rated 5 out of 5 by from INSANE POWER so I'm 12 years old and I ran this chainsaw for the first time more powerful than any Husqvarna I ran this thing is overpowered and excellent for what I need it for this is an insane saw it cuts fast I love it not even broken in yet and its still a champ.
Date published: 2017-07-13
Rated 5 out of 5 by from This makes retiring my old saw easy very pleased with my purchase Typical of all Stijl products they just run and so reliableMakes the work fun and quickOver all if you want a saw that you can pick up for a day of cutting or a hour or minutes get this saw as I find excuses to use it!
Date published: 2017-06-23
Rated 5 out of 5 by from Saw is a beast Put it to work for about 3 hours the first day. Cut through large trees like butter. Wish I would have bought a Stihl years ago.
Date published: 2017-06-16
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