FS 91 R - $339.95 DSRP


Distributor Suggested Retail Price
FS 91 R

DSRP: $339.95

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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.
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    •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 122.
Rated 4 out of 5 by from Great upgrade! Purchased Sept 2018- used 3 times so far, so cannot say much about the reliability and dependability yet.When I first bought my home, I purchased the most economical (aka cheapest) trimmer I could. It was a 2-cycle curved shaft. That machine never seemed to run right- but being a new operator, I figured it was me and not the machine. It was a pain to start, would bog down under load and was generally a pain to use. 10 years later I finally bit the bullet on a new unit. After researching and talking to some landscapers, decided to go with the bottom of the pro line instead of gambling on a home-owner unit (I don't have a very big yard, so may have been fine with a 56 or 70). The 91R was around three (more the 3X what my first one cost) but after just a couple of outings, this unit is definitely worth the extra $$ (so far- hopefully it continues to perform and not crap out in a few months!). Purchasing from a Stihl dealer, I was actually walked through the startup and operation and the unit was started and function tested before I left the store. Pros: 1. Easy Startup: warm or cold, this unit starts on the first or second pull 2. Power: plenty of torque to cut through the thickest grass. I believe this unit will also run a blade for small saplings as well (with an additional 'safety' upgrade). 3. Comfort: I am 5'10"- the straight shaft is FAR more ergonomic and easy-to-handle than the old curved shaft one 4. The bump head seems to work pretty well. You do have to be diligent when wrapping the line to ensure it feeds freely when bumped Cons: 1. Price: Definitely not cheap, time will tell if it is a worthwhile investment 2. Heat: This may be a matter of needing to play with the position of the handle, but currently, the forearm of my throttle hand get very close to the hot top of the power unit.. hopefully a non issue once adjusted right 3. Not the lightest, but seems to be well balanced. Might be an issue if you plan on prolonged use.
Date published: 2018-10-16
Rated 5 out of 5 by from Can’t go wrong Just got this after having an FS 90 R for a bunch of years. It’s awesome! Does everything well, great power and versatility!
Date published: 2018-10-04
Rated 5 out of 5 by from good trimmer love it. had a fs 45 before and now have fs 91 r. feels good in hands and has lots of power to cut down the heavies weeds.
Date published: 2018-10-02
Rated 1 out of 5 by from Issues running consistently Bought the product bran new after the 90 models were done... I had issues the first week with it running and dying on me ... took it back had it adjusted... ran great for a little bit then same issues..It’s back in the shop now for the fourth time... I have multiple 90 models and love em ... Not having good results with the 91 I don’t recommend it. I use Stihl everything in my business very disappointed
Date published: 2018-09-26
Rated 5 out of 5 by from Owner So far this trimmer has performed excellently, It was purchased to replace the previous model.Previous mod. lasted appx. 8 years and was used extensively.
Date published: 2018-09-23
Rated 5 out of 5 by from It has a lot of power. This is a very dependable and powerful machine.I recommend this machine to everyone.
Date published: 2018-09-18
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
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