MS 391 - $569.95 DSRP
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.
Model Features
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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.
Standard Features
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Common Features for Chainsaws
View the features common to many STIHL chainsaws. -
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. -
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. -
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. -
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. -
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.
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
STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.
We Also Suggest
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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
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.
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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.
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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.
Includes file guide, depth gauge, round file, flat file and two file handles in tool pouch.Chain Pitch File Diameter File Guide
Part NumberSharpening Kit
Part Numberin. mm in. mm Part Number 3/8 PMN 9.32 5/32 4.0 0811 411 8073 1/4
3/8 PM6.35
9.325/32 4.0 0811 411 8091 0.325 8.25 3/16 4.8 0811 412 8088 3/8 9.32 13/64 5.2 0814 243 3384 5605 750 4329 0.404 10.26 7/32 5.5 0811 412 8108 5605 750 4330
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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Performance Forestry Boot
Combine cut-resistant protection with comfort when you buy our STIHL performance forestry boot. Whether tackling tree removal or a tough landscaping job, this forestry boot will meet the demands of most any task. You’ll benefit from additional features like its well-padded steel toe cap, puncture resistant throughsole, and waterproof exterior. The insole and arch support systems were anatomically formed to provide maximum comfort, and the low-weight sole offers wear-resistant, nonslip traction. Stop by our STIHL showroom to check out what could be your next go-to work shoe.
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Anti-Vibration Gloves
Reduced vibration from handheld machines. Meets ISO 10819.1996 and ANSI S2.73 vibration standards TRM 72 and TRN 55.
Sizes available: L, XL -
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.
MS 391 is rated out of 5 by 237.
Rated 5 out of 5 by enucky3 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
Rated 2 out of 5 by Bonehead from Unreliable Used this saw about 40 hours over two years before it quit starting. Starting it progressively got harder. Took to Stihl service center only to find out the ignition module is faulty. Bought one from Ebay and it still starts no easier. At least I have spark at the plug now but with arthritis I cannot pull it hard enough to start. I would think Stihl should last more than 40 hours before having to replace pricey parts.
Date published: 2017-06-08
Rated 4 out of 5 by outdoorsguy55 from Quality built Product I am comparing this product to a 35 year old Pro Mac 700, so this may or may not be a fair comparison. A little disappointed in the power for a larger saw, had the 25" bar and chain installed at the dealer before purchase. Once its running, its a smooth cutting saw. Have run several tanks of gas thru it now, and am a little surprised at how finicky is is to start, especially after a warm refuel. Like the one quarter turn caps on the fuel tank and the oil tank, and the foot hole on the rear handle.
Date published: 2017-06-07
Rated 1 out of 5 by Scape403 from Second day into owning this saw and it won't start Worked ok for about 3 hours yesterday, started every 4th or 5th pull but fought for an hour with it this morning thinking something must be wrong return to the dealer and they say it's gonna take 2 days to replace the carb on a saw that's 24 hours old absolutely pathetic , won't let me return it won't lend me a new one in reality I expected a complete replacement
Date published: 2017-05-31
Rated 1 out of 5 by 03Tundra from Brand new MS391, won't start. Bought a brand new MS391 to compliment my smaller Stihl saw, Got it home, read manual thoroughly & it would not start. Acted flooded, gave it a few hours, still wouldn't start, Checked plug, was dry. Convinced I had to be doing something wrong, I returned to my dealer the following day to get their opinion. Their resident technician was very cool, as we eliminated any mistakes I may have made. Fresh fuel? Check, Stihl premix. Choked properly? Check. He took cover off, determined it was flooded, although I hadn't attempted to start it that day. He tried to start it and had the same results I did, and determined it was a faulty carb. Very frustrating for a new saw, returned it, got my $$ back, Planned on using it this weekend to do a ton of tree work. Very dissimilar experience from other Stihl products I've bought.
Date published: 2017-05-29
Rated 5 out of 5 by 1stsgt from Great operational saw I had a couple of new saws that I did not really care for, so I decided to trade them for another saw- a stihl ms-391. It would be a good bit heavier than the two saws I was trading in but it had a decompression button that would make it a lot easier to start. As is my usual procedure, I started the 391 out with a cap full of extra Ultra two cycle oil for the first two tanks and a little bit of Seafoam to clean out the fuel system. I let it mostly idle for the first tank with an occasional run-up to clean off the sparkplug. I could not believe how log it took to get it through the first tank of gas. It took considerably longer than my ms 271 by half again as much. It took six 15 minute sessions to get it through the first tank. On the second tank, as is my usual procedure, I let it do a little cutting. Nothing big or difficult - just small stuff. After it did a little cutting, I cleaned it up and put it on a shelf in the shop. No sooner had I put it up than the power companies tree cutting folks came back to my house and wanted to cut down a 12 Inch white oak on the rear of my property. I said fine but I want the wood.So, out comes the 391 and we spent the next two plus hours limping, bucking and stacking the tree they cut down. It got a good workout on that white oak. Actually, it only used 3/4of a tank of gas and ran the whole time. Just about anyone of my seven stihl saws could have cleaned up that tree but it gave me a good example of its dependability and abilities. Ever since then it has sat just inside my rear door, right next to my ms 261 cm, which is my other operational saw. To be an operational saw at my house means the saw is capable of being cranked on the back deck or front porch. Even on the kitchen floor if need be. Both of these saws have that capability in spades.
Date published: 2017-05-21
Rated 5 out of 5 by olsa53 from The saw that does it all very easy to start and use, light weight, and reliable.
Date published: 2017-05-19
Rated 5 out of 5 by Dudley16 from Great product Quality equipment and service. The MS391 has excellent power and ability, when using the recommended 20" bar, for any job so far.
Date published: 2017-05-03
