MS 391

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

Product Description

STIHL engine technology means low fuel consumption, longer run times and reduced emissions in this high-powered chainsaw. The MS 391 features our newest engine technology that adds fuel efficiency while reducing emissions as compared to other models. Though equal in weight, the MS 391 is more powerful than the MS 311. Add to that an optimal power-to-weight ratio and you have a chainsaw that’s cut out for the big jobs in field, farm and ranch. Felling trees, cutting firewood and cleanup after the storm just got a whole lot easier with the rugged MS 391.

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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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.

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 4.4 out of 5 by 337.
Rated 5 out of 5 by from Only problem When it gets hot and have to fill with gas won’t start till it cools down ?
Date published: 2019-07-16
Rated 5 out of 5 by from I enjoy tools, and Stihl is one of my favorite tools in the belt! Cuts like a beast, and is super dependable. Own Stihl trimmer, Stihl multi-tool, blower, and this beautiful chainsaw.
Date published: 2019-07-14
Rated 5 out of 5 by from You Can not beat the power for the price I have used many chain saws, Mac, Homelite, Husq. Poulan, and for the price the saw puts them down, 64cc hundreds less than a pro saw with 59 cc, the right chain, and it melts through wood like butter, simple features, easy maintenance, I will not own anything but a Stihl..
Date published: 2019-06-05
Rated 1 out of 5 by from Junk Junk saws I had to learn this the hard way complete waist of money makes a good conversation piece!!!!
Date published: 2019-05-25
Rated 5 out of 5 by from Great product. Fires up and runs well. Been using it for taking trees and down and storm damage. I recommend the premium fuel mix and bar oil. It's a good precaution and letting the saw warm up as well.Its about the same weight or less as my older 34av. Looking forward to a long life time purchase with this.
Date published: 2019-05-13
Rated 5 out of 5 by from Perfect saw for any job! My first use for this saw was to clean up a tree that averaged 2 foot in diameter. The MS 391 had no problem with cutting right through it. Was very impressed
Date published: 2019-04-30
Rated 4 out of 5 by from Awesome power Never wants to start. When it does it’s more than enough saw. Had to mark it down for reliability due to the starting issue.
Date published: 2019-04-18
Rated 5 out of 5 by from Great saw but heavy I love this saw, I've owned it for 7 years now. It handles most everything I throw at it without issue. starts every time, power is good. Making sure you buy the right chain for the job makes this saw an animal.....right till you start bucking with it then you realize the weight of this saw and can wear you plum out if your not use to doing it all day and this is where a smaller saw can help you out. cutting the truck of a tree is great and I have embarrassed my friends with their other brand saws countless times while cutting up a tree with this saw cutting it like a hot knife thru butter BUT come time to limb the smaller stuff and again a small saws job but manageable, would I buy this saw again? yes all day everyday.
Date published: 2019-04-11
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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.

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Support

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