Our top-of-the-line chainsaw for farm and ranch.
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.
|MS 391 Specifications - Mid-Range Use|
|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 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.|
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
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.
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.
Common Features for Chainsaws
View the features common to many STIHL chainsaws.
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.
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.
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
Don’t let friction cut down your chainsaw’s performance. STIHL bar and chain oil is specially formulated to adhere to your chainsaw’s bar and chain, providing optimal lubrication. Special oils help prevent sap and pitch from clinging, prolonging cutting performance and the lifespan of your chain parts. Ideal for use in moderate temperatures, STIHL bar and chain oil provides quality protection for your chainsaw – bar none.
Just like our chainsaws, our case can handle multiple tasks. Use it to carry and transport your chainsaw to and from the work site. It is also ideal for storage when your workday is done. It’s unique, removable bar scabbard has built-in tool holders to carry tools to the cutting site. Fits MS 170 to MS 460 with 20” bar. (Excludes MS 441 and wrap-handle saws.) Replacement parts available.
No matter how you slice it (or trim it or shred it), there’s no better protection for your high performance 2-stroke engine than STIHL HP Ultra. This 2-cycle engine oil has outstanding engine cleaning characteristics, plus “ultra” lubricating qualities that are superior to other 2-cycle engine oils. This fully synthetic oil is also highly biodegradable, degrading by 80% in 21 days. We’re so confident this oil will protect your engine, we’ll double your STIHL limited warranty* when you use it. It’s that good.
*Double your warranty when you purchase either STIHL HP Ultra Oil (six-pack) or STIHL MotoMix® Patented Premixed Fuel (one gallon minimum) with your STIHL product purchase. Double limited warranty protection applies to STIHL gasoline-powered products purchased and registered for personal non-income producing, family and household purposes only. Other restrictions apply. See dealer for details.
Includes file guide, depth gauge, round file, flat file and two file handles in tool pouch. Kits available for the following chain types: STIHL PICCO™ Mini; 1/4" pitch chain; .325" pitch chain; 3/8" pitch chain; .404" pitch chain.
For Your Safety
The woods can hold many dangers. Stay one step ahead with the Forestry Helmet System from STIHL. The protection starts with a hard shell of ABS thermoplastic. It gets even better with a six-point, ratchet-style suspension system that absorbs shock and keeps the helmet stable while you work.
The system also features a Cool Guard sweatband to keep perspiration out of your eyes, as well as a built-in rain gutter to direct rain away from your face during inclement weather. Adjustable hearing protectors comfortably reduce noise while an epoxy-coated steel full-face screen helps protect from flying debris.
Hard hat meets ANSI Z89.1-2003 Type 1 Class G. Hearing protectors meet ANSI S3.19-1974 and have a Noise Reduction Rating (NRR) of 24 dB(A).
Reduce the vibration from handheld machines with anti-vibration gloves from STIHL. The palms and fingers are specially designed to absorb vibration energy, helping you stay steady throughout your workday.
Classifications: Meets anti-vibration standard ISO 10819:1996 and ANSI S2.73.
-TRm at .72 for mid-frequency range
-TRh at .55 for high-frequency range
Materials: 7-gauge knit shell, shock-absorbing material and elastic wrist
Available sizes: L, XL
When you need dependable, long-lasting protective apparel, STIHL has the solution. Using rows of heavy-duty zippers, the Performance Series Zip Chaps provide full wrap-around protection for a user’s lower leg area. The zippers run along the entire inseam of the chaps, helping to ensure a comfortable fit that is easy to put on and/or remove. The outer material is crafted from durable orange Cordura® nylon fabric, an all-weather material used in a range of premium outerwear brands. Inside, the chaps feature six layers of Avertic® Pro by Engtex® cut retardant material, designed to reduce the risk or severity of injury in the event of contact with the rotating saw chain on a gasoline-powered chainsaw. They are great protective chaps in both the heat of summer and the cold of winter.
The STIHL Performance designation identifies products for advanced users.
Available color: Orange
Available length: 32”, 36”, 40”, 44”
See it in action!
NOTE: Chaps are measured by overall length from the waist down. STIHL chaps have a tough outer shell of oil/water-resistant nylon, treated with rain/stain repellent.
Hardworking professionals need hardworking protective apparel, and the STIHL performance forestry boot is designed with this standard in mind. The cut-resistant work boot is appropriate for a wide variety of job demands. It comes with multiple protective features like the well-padded steel toe cap and puncture-resistant, stainless throughsole. Its insole and arch support systems were made with moisture absorbing, flexible material and were anatomically formed for added comfort. If you’re looking for a durable boot to depend on, the STIHL performance forestry boot will meet your needs with comfort and style.
The STIHL Performance designation identifies products for advanced users.