FS 91 R


FS 91 R

A professional trimmer packed with features for simplified and convenient trimming.

Demanding landscapers can save time using the STIHL FS 91 R professional trimmer. With its larger fuel tank than the FS 90 R, this model provides 30% longer run times, as well as a three-step start procedure to get to work faster. Thanks to its superior air filtration and low-emission engine, the FS 91 R is a dependable tool with great maneuverability and power. Its rubberized loop handle is desig...Read More
Print Spec Sheets
FS 91 R Specifications
DISPLACEMENT 28.4 cc (1.73 cu. in.)
ENGINE POWER 0.95 kW (1.27 bhp)
WEIGHT* 5.5 kg (12.1 lbs.)*
FUEL CAPACITY 710 cc (24.0 oz.)
POWER SOURCE Gas
*Without deflector and cutting attachment.
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.

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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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    Shoulder Strap / Carrying System
    Using a shoulder strap or carrying system helps distribute the weight of the equipment for increased operator comfort and improved maneuverability.
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    Adjustable Front Handle
    Adjusts for comfort.
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    Fully Lined Drive Shaft
    Provides smooth operation and less vibration.
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    High Tech Polymer Housing
    Housings are lightweight, withstand greater impact and are corrosion-resistant.
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    Protected Choke Lever/Knob
    Helps prevent damage.
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    Start/Run/Stop Controls on Handle
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    Throttle Trigger Interlock
    Must be depressed before the trigger can be activated.
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    Air Filter Cover
    Easily removed for fast and easy filter cleaning or replacement.
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    Protected or Enclosed Control Cables
    Eliminate dangling and loose wires.
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    Heavy-Duty Steel-On-Steel Clutch
    Centrifugal clutch is designed to reduce slippage.
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    Protected Spark Arrestor Muffler
    Has large baffles which reduce noise level and contains a screen designed to reduce the emission of sparks.
Standard Features
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    Common Features for Trimmers
    View the features common to many STIHL trimmers.

Important Information
WARNING! Improper use of any trimmer/brushcutter can cause serious or fatal injury. Read, understand and follow all safety instructions in your instruction manual. To reduce the risk of injury from blade contact, circular saw blades may be used on FS brushcutters that have a limitstop, a bicycle handle and double shoulder harness and not on FS brushcutters with a "J" handle or loop handle. Other rigid blades may be used on FS brushcutters having a bicycle handle, a "J" handle or a loop handle equipped with a barrier bar. To reduce the risk of eye injury always wear proper eye protection. Always use the appropriate deflector for the type of cutting attachment, as explained in your instruction manual.
Note: STIHL engine products with the Caring for Nature logo are cleaner than EPA Standards for exhaust emissions.
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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    •2.6 oz. bottle makes 1 gallon mix

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    STIHL recommends a mix of 50:1 high-quality 89 octane or higher unleaded gasoline to STIHL engine oil. This same mix ratio should be used during break-in.

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    No-Spill® Fuel Containers
    The latest advance in gasoline can technology is here with No-Spill® fuel containers. Featuring a special treated body for low permeation, thumb-button flow controls for easier pouring, and a wide and stable base design to reduce upsets, No-Spill® fuel containers help ensure that the gasoline goes into your tank, not on the ground or into the air. Fill even smaller-sized tanks without spilling – flow stops automatically when the tank becomes full. With 1¼-gallon, 2 ½-gallon and 5-gallon sizes available, you’re sure to find one that fits your needs. Ask your local STIHL Dealer about No-Spill® fuel containers. Don’t settle for anything less.

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For Your Safety
  • STIHL® Pro Mark™  Hearing Protector Zoom
    STIHL® Pro Mark™ Hearing Protector
    Padded stainless steel spring wire headband maintains constant pressure. Easy to adjust. Noise Reduction Rating (NRR): 29. Meets ANSI S3.19-1974 standard.

    Colors available: Camouflage, Orange and Grey
  • Patterned Frame Glasses Zoom
    Patterned Frame Glasses
    Experience professional-grade protection from the harsh sun with the Patterned Frame Glasses from STIHL. Offering 99% UV protection, the glasses meet ANSI standard Z87.1+ and feature comfort-cushioned nose pads and polycarbonate impact-resistant lenses. They’re also lightweight and slip-resistant. Stop by our showroom to check out the Patterned Frame Glasses, as well as all of our protective eyewear!
  • High Performance PRO Gloves Zoom
    High Performance PRO Gloves
    Elastic slip-on cuffs. Padded palm and knuckle guards. Reinforced PVC grip overlays. Sizes: M, L, XL

STIHL Dealer Days are Happening Now!

FS 91 R is rated 4.9 out of 5 by 10.
Rated 5 out of 5 by from Only trimmer you will ever buy I just purchased a FS91R yesterday and love it. I used to mow commercially and we used to 100rx but I wanted something a little lighter so I purchased th 91R. In one season of commercial mowing I easily put 400 hrs on the 100rx with no issues. My father purchased a Stihl trimmer 25 years ago and he is still using it today. I logged a lot of hours on his trimmer and hopefully will do the same with mine! So I figured if I am going to buy a trimmer it's going to be a stihl!!!
Date published: 2017-04-19
Rated 5 out of 5 by from Machine is a BEAST! I have the FS 130 with handle bars and i only use a blade on it I wanted a trimmer that could be multi purpose, use string or blades, so i picked this one up. Today, the first time using it, i put the brush knife on it. We had roughly 1500 sq feet of extremely thick brush to cut by a shoreine about 6+ feet tall. It had more than enough power to get the job done. If i were using a blade on this unit all the time I'd have the handle bars though. Im extremely happy and satisfied with this BEAST so far!
Date published: 2017-04-13
Rated 5 out of 5 by from Easy start up Great trimmer with easy start up. Plenty of power to handle any job I have for it.
Date published: 2017-04-11
Rated 5 out of 5 by from Very strong trimmer Used my other 2 trimmers (box stores junk)as targets.... the 91r was well worth the extra price. Great power very quite. Probably more than I will ever need does not bog down powers right through. Very easy to start. Weight was not a factor. Very well balanced. Purchased from lankys in Dunn nc. Great people
Date published: 2017-04-09
Rated 4 out of 5 by from Somewhat Disappointed I purchased a new Stihl FS 91 R about a week ago, I've used it twice so far. I've had a few problems with it. The Stihl trimmer line that came with it had tiny cuts in it, I assume to make it break easier. It kept breaking off inside the head, I needed a screwdriver to get the cap off to re-thread the line. The head was very complicated, the last double line trimmer I had had a hole in the spool, I simply doubled the line through the hole and wrapped it, the cap came of easily with my fingers. I also had a problem with the throttle linkage sticking, the trigger wouldn't pull. I manipulated it several times and it began working. The deflector shield over the head doesn't cover enough of the string, small bits of weeds fly up and hit me in the face. I just put a different brand .095 line on the machine that doesn't have tiny cuts, I'm hoping it works better. I definitely like the muffler sound, it's not nearly as loud as any other trimmer I've used. It doesn't give me a headache after about 2 hours of work. It does start easily, that's very important to me. This machine was pretty expensive compared to other trimmers, I would recommend it, but the head design in particular could probably use some improvement.
Date published: 2017-04-06
Rated 5 out of 5 by from Loved it! I do the trimming at home. My fiancee does the mowing, and I absolutely love it! I have tried 5 other trimmers, but this by far was the greatest decision ever. It's pricy, but so worth it. I love my FS 90 R and I recommend it to everyone.
Date published: 2017-04-05
Rated 5 out of 5 by from AWESOME TRIMMER!! My dad has a 90 and I used it for years and I absolutely loved it, so when I had to finally purchase one I tried to get him to upgrade his so I could buy the older one. He would not upgrade. Luckily the local shop had one. Starts up on the first pull. These are awesome trimmers and definitely worth the money. Go ahead and get the straight shaft 91 and you'll have all the power you need.
Date published: 2017-04-04
Rated 5 out of 5 by from Amazing Power! My other Stihl is a FS 65 RC which was plenty powerful for yard use but it is currently out on loan so I replaced it with this model, with farm use in mind. I am amazed by the difference in power. I wanted this model for brush in fence lines (brush blade), etc. and to use on my yard until I get my other model back. This trimmer is definitely overkill for normal yard use even on the first mow of the year. This is a great model for thicker use applications like ditch mowing, high grass, and those areas that don't get mowed very often thanks to its awesome power. I plan to put the brush blade on this one use my 65 for the yard. I don't see an application that would require any more power than this trimmer has, very pleased!
Date published: 2017-03-30
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