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
POWER SOURCE Gas
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 Chainsaws
    View the features common to many STIHL chainsaws.
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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 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 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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    Chain Pitch File Diameter File Guide
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    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
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    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

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

     

    Where 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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Rated 4.7 out of 5 by 144reviewers.
Rated 5 out of 5 by 12 loggers cords and a new 391 I bought this saw brand new just all factory I left the 18" on it for firewood been cutting with it everyday it is a great saw and its light and its got more than enough power I cant seem to bog it down it fires right up in two three pulls tops I really like how light it is and how good it is on fuel and bar oil I can cut for it seems like hours before I have to fill it up and sharpen it I will keep doing my wood and post another review in the winter let everybody know how its running August 24, 2015
Rated 5 out of 5 by MS 391: A fast, dependable saw for big jobs. I had two dead oak trees in Illinois that had to be removed with diameters of 40 and 52". The best offer I could get was $900 for an arborist to remove just the smaller tree. Instead I purchased a 28" blade for my MS 391 and called a few buds to help cart the logs away. Each tree came down easily and I cut them into 25" lengths. It took about four hours per tree from start to finish. This is not a light saw, but if you let the saw work for you it pulls itself right through the tree and you can go for hours. That saw never kicked back or lagged once, and the chain stayed sharp through the entire job. One tree alone paid for that saw! My guys saw how easily it was cutting and begged me for chances to try it out themselves. Is there a finer saw anywhere? I've not found it. August 14, 2015
Rated 5 out of 5 by i love the power i have a ms 290 and was wanting a bigger more powerful chainsaw i cut a lot of firewood some 30 plus inch logs and the ms 290 is good but lacked the power i needed to get the big jobs done so i got the ms 391 and love it so far its got plenty of power my only complaint is that its heavy but if you can over come the weight its a great chainsaw to get. July 19, 2015
Rated 1 out of 5 by Disapointed in saw. Bought the MS 391 in March 2015. Used saw 4 times and every time about 1 hr. into cutting the saw stalls out and does not have power. I have to quickly pull throttle trigger multiple times to keep it from stalling or bogging down. I use 1 gallon of fresh premium gas and 2.6 fl. oz. of Stihl HP Ultra 2 cycle fully synthetic engine oil that I purchased with the saw. I took the saw back to the dealer (Hastings Ace Hardware) who I purchased it from and they removed the gas from the tank and placed it in a mason jar to observe it for several days. They showed a sample of gas to me and said the ethanol and gasoline was separating causing the saw to have the problems I am experiencing. I also did the mason jar test in my garage at home with the mix from my can and left over fuel in the saw's tank. Never have I seen any separation and the fuel looks uniform in color, nothing like what Ace Hardware employees showed me. The fuel is and looks fresh. Yet I still have problems with power and I am beginning to feel that I have a defective saw. I have a 2 year warranty on the saw, and I am just short of demanding a new saw or a return of my purchase amount in full. I also purchased a Stihl FS 56 RC string trimmer this spring. Unfortunately, I have not used the trimmer enough to know if I will have similar problems. I have owned another Stihl chainsaw for many years without any problems and this helped me decide to purchase other Stihl equipment. I cut an average 10 to 12 full chord of firewood annually and I really don't need mechanical issues with a new saw when I am in the woods. July 17, 2015
Rated 5 out of 5 by Lives up to the Stihl name This was my first Stihl that I purchased as brand new (got it while it was on sale). All of my other Stihls that I own I purchased as used (18, 28, 36, 44). It is just as reliable as all of the Stihls I have owned, with one exception: it doesn't run very well on old mix and it definitely needs Stihl mix to run at it's peak performance. My older Stihls were not finicky on old mix. For the price, this is a great saw for felling trees and crosscutting for firewood. July 11, 2015
Rated 2 out of 5 by Nice saw but pretty gutless. The saw seems to be well built but really has no power, which is unreal for the c.c. it has. It was that way from day one too. Its not like its old and worn out. use the saw around the house on small jobs and it struggles. Ive used lots of other saw of much lower quality that had way more power. I would not recommend this saw if you have any sizeable wotk to do. July 4, 2015
Rated 5 out of 5 by Great saw This saw is great. The power is amazing. It starts every time by the third pull of he rope. I will recommend that if you are experienced with a saw and cut a lot of firewood get a different chain. The chain that comes with it is a low kickback version that shouldn't even be put on a serious saw such as this. Morgantown Outdoor Power is an awesome retailer, very helpful. June 29, 2015
Rated 5 out of 5 by Really good saw for the price This is a solid saw. I have a 291 that is light but not much power. I also have a 461 with plenty of power but fairly heavy. I have the 391 set up with a 20 inch bar and it has plenty of power and not too heavy. So just right for my uses. As far as starting I have no problem with that and use it at altitudes ranging from 5 to 10 thousand feet. Fires right up. For those with problems here is what mine likes. First pull on full choke it pops. Push the lever up one spot while the throttle is still locked open and the chain brake is off. 2nd pull fires right up, pull the throttle and it pops into the run position. Warm fires right up. And the compression release is to be pushed in to start. It pops out on its own. Maybe that will help? So a great saw that I really like and use the most. And is really easy to start if you can follow directions June 22, 2015
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