MS 391 - $569.95 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
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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.

    More Information

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.

    More Information

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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 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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For Your Safety
  • Forestry Helmet System Zoom
    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.

Are You Ready for a STIHL?

MS 391 is rated 4.5 out of 5 by 253.
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
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