FS 91 R - $339.95 DSRP


Distributor Suggested Retail Price
FS 91 R

DSRP: $339.95

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.

    More Information

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

    More Information

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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: Cancer and Reproductive Harm - www.p65warnings.ca.gov
ADVERTENCIA: Cáncer y Daño Reproductivo - www.p65warnings.ca.gov
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
Optional Accessories
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    Gearbox Attachments
    Gearbox attachments are available for this model. View the interchangeable gearbox chart to find out which attachments work with this model.
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    Trimmer Heads & Blades
    Many trimmer heads and blades are available. Find out which ones to use with this model in this chart.  
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    Trimmer Line
    There's high-performance STIHL trimmer line for every operating condition. 
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    Deflectors
    Protect yourself from flying debris while trimming. Check out our selection of deflectors and find the one that will help protect you.
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    Straps and Harnesses
    They distribute the load from your hands to your shoulders. They also help reduce operator fatigue and make it easier to use trimmers, brushcutters and clearing saws for extended periods.
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    HP Ultra is a fully synthetic 2-cycle engine oil specially suited for high performance chainsaws and power tools. This oil has outstanding engine cleaning characteristics, plus “ultra” superior lubricating qualities in comparison to other 2-cycle engine oils. It is ideal for use in STIHL 4-MIX® engines. This oil is biodegradable, degrading by 80% in 21 days.

    •2.6 oz. bottle makes 1 gallon mix

    •5.2 oz. bottle makes 2 gallon mix

    •6.4 oz. bottle makes 2 1/2 gallon mix

    •12.8 oz. bottle makes 5 gallon mix

    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.

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

Are You Ready for a STIHL?

FS 91 R is rated 4.3 out of 5 by 94.
Rated 5 out of 5 by from Great trimmer with plenty of power for all lawn care needs. Starts easy every time. This is my favorite professional lawn care trimmer. It has the perfect blend of power/performance/balance/reliability for ant lawn care job. Comfortable for extended use. Very little vibration at all operating speeds(best in class)!
Date published: 2018-06-14
Rated 5 out of 5 by from FS 91 R I bought this product this year to replace an old trimmer. It does everything better than my old home depot special if you know what I mean. In addition, I also purchased a new hedge trimming bar with the machine and it's incredible. It saves me so much time on jobs with the edging and have the ability to do bigger hedge jobs. It is truly a win win. I would highly recommend this product to anyone doing more than just their own home. I have used Stihl in the past, but this machine made me a life customer, and since the purchase of the trimmer I also bought a new Stihl (BR600) blower to replace my old one the product is just superior. There is only one downside the weight, but it is worth the trade-off for the power and reliability.
Date published: 2018-06-13
Rated 2 out of 5 by from Carburetor Problems since Purchase I bought my FS91R in Feb18 and have had low and high idle problems e.g. many pulls to start, rough idle, and stalling out during idle and full throttle. I turned it it in to adjust carburetor. I received it back and had it running well and then it would not start. I unsuccessfully attempted to adjust the carburetor myself. I turned it in to replace the carburetor. it was at the service sight for 3 weeks waiting for a carburetor 3 WEEKS. Stihl product are very difficult to find parts for and make repairs. I purchased Stihl for my new business based on their reputation. I will not be purchasing Stihl again.
Date published: 2018-06-11
Rated 4 out of 5 by from Newby review, initial impressions I’m 64, have had various trimmers over the years.My wife and I are building on 8 acres of level pasture with native grasses that will reach eye level. As I will be grass/brush trimming regularly I wanted a quality trimmer with some grunt. This trimmer handles everything with ease so far.My friend who knows his way around tools of all types was impressed that the trimmer handled some of the tall thistle weeds with only the string. I have had no problem with the string breaking or re-winding the spool. Easy peasy.My only complaint so far is the gas tank is too big, you can cut for a long time without stopping.Not cheap so 4 stars, and 3 stars for dependability as I’ve only used it 4 times.Just bought a bigger blade guard and a grass blade. Hope it works well.Easy to start (using motomix)
Date published: 2018-06-10
Rated 5 out of 5 by from LOVE STIHL BEST GAS TRIMMER HAD FOR 2 YEARS OF MOWING SEASONS LOVE IT LOVE IT BEST FOR YOUR BUCK... LAST LONG
Date published: 2018-06-09
Rated 4 out of 5 by from Reliable!!! Starts great and runs good but I miss the old school 2 stroke rip! Awesome for everyday around the house stuff plus a lot more, I somehow manage to bog it down in high weeds but that might be my own fault for using a regular grass head when I should be using a brush knife of some sort.
Date published: 2018-06-04
Rated 1 out of 5 by from Cannot wait to return this product Spent most of my time dealing with adjusting the line than actually cutting grass. A goat would have been faster
Date published: 2018-06-02
Rated 5 out of 5 by from Love the product Before I purchased my new Stihl product I read all the reviews I could find, quite frankly I was skeptical about buying, many reviews basically were not good, being that said I purchased anyway, and so far it has preformed great, no problems starting, one pull fires right up, after the brake in period it has plenty of power. I have 4 acres to mow and weed it. I would recommend the FS 91 R to any who askMikeIn Idaho
Date published: 2018-05-31
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