FS 91 R - $329.99 DSRP


Distributor Suggested Retail Price
FS 91 R

DSRP: $329.99

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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.)
CUTTING SWATH 16.5"
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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    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
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.
We Also Suggest
  • HP Ultra 2-Cycle Engine Oil Zoom
    HP Ultra 2-Cycle Engine Oil
    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

Are You Ready for a STIHL?

FS 91 R is rated 4.3 out of 5 by 116.
Rated 5 out of 5 by from Did an excellent job Needed to clean up my deceased Mother's property for sale and this product was recommended by Mr. Cotton at Hernando Equipment Co. Cut through the grass and brush easily. So glad I invested in this.
Date published: 2018-09-06
Rated 5 out of 5 by from Great Trimmer! We use 12 of these at work and they are far superior to other brands! Lots of power and minimal downtime due to breakdowns. I can’t recommend these enough.
Date published: 2018-09-04
Rated 5 out of 5 by from Upgrade for home use. I had always bought trimmers from the box stores and they never had enough everything, so this time I went with the professional model and wow am I happy with my choice. It has everything power, easy to handle couldn’t ask for better I highly recommend this trimmer.
Date published: 2018-09-04
Rated 4 out of 5 by from Good yard tool, very dependable and good quality. Light weight, dependable, good quality but higher priced compared to other brands..
Date published: 2018-09-02
Rated 1 out of 5 by from Love Stihl but this product is horrible. Bought this from a local dealer. Got it home started right up and after 2 minutes it would not feed the string. Took the head apart and redid the line and started it and over and over the string would not feed. Took it back to the dealer they said the string was old and gave me some new string. Once again re did the string and after two minutes it would not feed. Over and over with this piece of garbage re string and take the head off and do it again and again. If you want a string trimmer that the string lasts about 2 minutes then this is the string trimmer for you. Absolute and complete garbage, the head does not hold enough string to start off with and then it does not feed no matter what you do. If it does feed it is out of string before you do one curb.
Date published: 2018-08-26
Rated 5 out of 5 by from FS 91R Trimer I've had the FS 91R for a year. At first I had trouble keeping it idling without stopping. After a few uses and break in it it runs great. One pull starts, idles fine and Its a workhorse.! Very happy with it now.
Date published: 2018-08-23
Rated 5 out of 5 by from Great upgrade trimmer for a home owner I upgraded to this trimmer when I moved into a 10 acre wooded estate earlier this summer. Easy to start, quiet, powerful, good balance string trimmer that I enjoy running. I've had the chance now to run it with some of the blades while clearing brush and greenbriars, this trimer makes an easy job of it.
Date published: 2018-08-22
Rated 5 out of 5 by from Excellent My first Stihl Product, i use for residential every 2 week and love the power of this equipment and the build quality is Perfect, but the price in my country little high for this
Date published: 2018-07-28
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