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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 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 249.
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
Rated 5 out of 5 by from ms391 i'm i love with this saw i love this saw from the beginning. I have always owned cheap saws until now. it has to be started with a routine, but that's ok. it starts for me every time. it pulls like heck though oak and hickory on my 11 acres. this is the most amazing saw for me. reliablepowerfulfast cuttingeasy starting for me.
Date published: 2017-10-24
Rated 5 out of 5 by from Farm Chain Saw I live on a farm with 20 acres of woods and big old hardwood trees. When they come down the Stihl MS 391 has plenty of power to cut these up. Even with a 25" bar some of these need to be cut from both sides to get through them. This machine has enough power to chew through tough oak using the full length of the bar. It starts easy enough for a saw of this size. The decompression button makes starting much easier. I'm very happy with this saw.
Date published: 2017-10-02
Rated 5 out of 5 by from Easily fell the largest trees I've ever sawed Starts on the first pull and runs great. I just cut down several large poplars that were easily the largest trees I've ever fell. I've got a 25-inch bar on mine and it's had no problem tackling whatever I throw at it. Just know that handling this saw for hours will ware you out. It's extremely powerful and is not for the faint of heart or a beginner. Highly recommend for anyone who has very large trees to remove.
Date published: 2017-09-25
Rated 5 out of 5 by from This saw lives up to my expectations, I have been a chain saw user since the 1960's And a stihl saw user since the late 1960's. Starts easy, adequate power for my use, easy maintenance, and dependable.
Date published: 2017-09-20
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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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