FS 91 R - $329.99 DSRP SAVE $30.00 on select models


Distributor Suggested Retail Price
FS 91 R

DSRP: $329.99 $299.99

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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.)
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! 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

STIHL Dealer Days are Ending Soon!

FS 91 R is rated 4.4 out of 5 by 77.
Rated 5 out of 5 by from Easy starting quality product with plenty of power! Easy starting product with plenty of power for the homeowner or pro lightweight. A little noisy would recommend noise protection. Highly recommendable
Date published: 2018-05-15
Rated 5 out of 5 by from Great Trimmer I have 2 acres with a 1/2 acre pond that I use this trimmer for. So far it has not failed to start and has need able to cut down the biggest cat tails!
Date published: 2018-05-15
Rated 5 out of 5 by from Great product once you replace line The trimmer runs great and has lots of power but the initial line on the trimmer seemed brittle and weak. Once new line was installed, cutting went much better.
Date published: 2018-05-14
Rated 4 out of 5 by from Good machine, really hogs through heavy grass and weeds Lots of power, runs well, larger fuel tank is nice. Overall does a great job at the heavy grass and weeds in my ditch and around the farm. Adding more string is a pain though. Buy good stuff so you don't need to change it often.
Date published: 2018-05-14
Rated 5 out of 5 by from Glad I chose this I love it. Works great and starts up on first pull every time.
Date published: 2018-05-13
Rated 5 out of 5 by from A Great Machine Plenty of power, a good all around machine. Would be a much better value if you didn't have to buy a brush cutting guard and kit separately), after all, if you are buying a set up like this you want to have that capability..
Date published: 2018-05-13
Rated 3 out of 5 by from Great Trimmer Love the ergonomics and the engine runs great. I do hate the spool head, it could be much easier to load if it was more like the spool head on the Echo.
Date published: 2018-05-08
Rated 5 out of 5 by from Best trimmer I have ever used I love the torque of the fs91r it really cuts well right off idle and is really good on fuel I used it for 2 hours and still had a half tank i have a large property and it takes two days to trim everything so I really like that it doesn’t use as much fuel I really like the rubber grip and new rubber loop handle it is quite and really smooth running I will definitely be buying more stihl equipment in the future I should have got a 4mix trimmer years ago.
Date published: 2018-05-07
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