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.)
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.)
OILOMATIC® CHAIN 3/8" RS3
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
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    Built in the USA
    Indicates products that are built in the United States from domestic and foreign parts and components.

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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.

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Standard Features
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    Common Features for Chain Saws
    View the features common to many STIHL chain saws.
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    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.

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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 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
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    Complete Filing Kits
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    Chain Pitch File Diameter File Guide
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    3/8 PMN 9.32 5/32 4.0 0811 411 8073

    5605 750 4327

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    3/8 PM
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    5/32 4.0 0811 411 8091

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    5605 007 1027

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    5605 750 4328

    5605 007 1028

    3/8 9.32 13/64 5.2 0814 243 3384 5605 750 4329

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    0.404 10.26 7/32 5.5 0811 412 8108 5605 750 4330

    5605 007 1030

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    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.

     

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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
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