MS 391

MS 391
Our top-of-the-line chainsaw for farm and ranch.

Model Features

  • 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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  • Built in the USA
    Indicates products that are built in the United States from domestic and foreign parts and components.

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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 depending upon which powerhead it is installed.

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.

Reviews

MS 391 is rated 4.5 out of 5 by 207.
Rated 5 out of 5 by from awsome saw I have 2 other saws and they are stihl 026, 171 . i needed a saw with a 20" bar for some big tree's. I was wanting to get the 311 but everyone was out of them. so the salesman , said the 391 was the next best choice. boy was he right ,this thing goes through some wood!!!! my nickname for the saw is "wood hog"
Date published: 2016-12-29
Rated 4 out of 5 by from This saw is GREAT, until it ain't I bought this saw to get out of the endless loop of disposable saws. Having worked in the equipment rental industry for some time years back, I came to realize the difference in quality equipment vs cheap equipment. When I purchased this saw, I maintained it meticulously, keeping up with adjustments, keeping a sharp chain, and emptying the tank when I knew it would sit up for any time. I buy only straight 90 octane gas and mix with Stihl synthetic oil, but alas, to no good end. With less than 100hrs runtime on the saw, it had to have a new carb. I took it out for two days of cutting firewood and it ran like the champ it is. Not one hickup or hard start. Day 3-won't hit a lick. I figured trash in the fuel or pickup or dirty filter, but nope; took it to the dealer I've been doing business with and was told, "Oh, this just happens. You gotta have a new carb. Sorry." I STILL love this saw, but a carb that costs this much after so little runtime really turns me off. At this rate, the disposable saws aren't such a bad deal after all, but I won't go back to them.
Date published: 2016-12-14
Rated 5 out of 5 by from Wood eating machine I have had the MS 391 for a month now. I live on 15 acres of woods and needed a machine that could cut through anything. I have cut down oak, hickory, and poplar. This machine had no problem with any of them. My previous STIHL was the 028. My father had bought it brand new almost 30 years ago and passed it down to me, I believe this saw will last just as long.
Date published: 2016-12-12
Rated 5 out of 5 by from MS 391 Fantastic chainsaw The MS 391 (25” bar) is a wood eating work horse. I have absolutely NO complaints regarding this chainsaw. I have read reviews that indicate it is difficult to start. That is a falsehood promoted by individuals that are not knowledgeable regarding STIHL products or 2 cycle equipment. FOLLOW the instructions & you will have a chainsaw that is amazing & reliable. The MS 391 isn’t cheap, but you pay for quality. Highly recommend STIHL & MS 391.
Date published: 2016-11-30
Rated 5 out of 5 by from Farm BOSS Bought a ms391 to replace another brand chainsaw that was wore out and under powered for amount of work I have been doing. The first day out I wish I had bought the stihl to start with, so much less work and effort to drop trees and then cut them up, just lay it on the wood and press the gas. After you get over the sticker shock of buying a stihl you will happy you spent the extra money. I always thought stihl was overrated and that all the name brands were close, that doesn't apply to chainsaws I've found out
Date published: 2016-11-28
Rated 5 out of 5 by from Best saw I've owned The MS391 has impressed me immensely! Stihl had done a great job packing this much power in the saw. Wow. I've paired it up to Husqvarnas of equal stats on paper and the 391 blows them away. Stihl is the only way to go, and this MS391 is the best for my ranch. Now to find somewhere close to me that sells full-skip chains!
Date published: 2016-11-21
Rated 1 out of 5 by from POWERHEAD SIEZED 9 DAYS AFTER WARRANTY MS391 along with the case of premixed fuel. never had a problem starting. Today I dropped a an 18 inch walnut and noticed the power head was smoking. I reached to pull the start lever and it seized up. I let the machine cool for awhile which I assume did not take long since it's 35 degrees here. Still no luck. So I spent a lot of money for something that performed well for awhile. I used duratac chain oil and the manufacturers gas. I still have 2 cans left! Now the warranty is up and I'm sure as not going to spend this much money on something that lasts under one year. The issue for me is this happened 5 days after the 1 year warranty ended. This is not my grandfathers engine company.
Date published: 2016-11-21
Rated 2 out of 5 by from No lie, my brand new Stihl left me high and dry out in the field on the first day on the first tank However I will continue to outfit my company with Sthl equipment, my problem with Stihl and every other manufacturer is that cheaper metal and plastics have taken the place of reliable, heavy duty metal parts. Two weeks ago I purchased my newest Stihl chainsaw to replace my 310 that needed some more shop time. Out in the field on my first tank of gas on my first chain re-tightening, while attempting to tighten the brand new chain on it's maiden voyage one of the tabs broke off the chain tightening mechanism and with no way to tighten the chain I was done for the day.When I returned the saw for repair I was informed that my (less than 24 hours old) new Stihl would not be covered under warranty and in fact I would not only pay for the parts and the labor but shipping as well.If this true story doesn't compel your company to strive for better customer service for its long standing customer base, I don't know what will.Long time customer,Scott Carpenter
Date published: 2016-11-17
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Standard Features

  • 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.
  • 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.
  • Common Features for Chainsaws
    View the features common to many STIHL chainsaws.
  • 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.

You Will Also Need

For Your Safety

Support

Chainsaw Safety and Maintenance - Video
Product Instruction Manual (PDF)
Product Safety Manual (PDF)
STIHL Limited Warranty
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