FS 91 R - $319.95 DSRP SAVE $20.00 on select models

Distributor Suggested Retail Price
FS 91 R

DSRP: $319.95 $299.95


Reserve with STIHL Express for In-Store Pick Up

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.)
*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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    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
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    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.

  • No-Spill® Fuel Containers Zoom
    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.

    Meets California Air Resources Board Phase II requirements for sale or use in California. No-Spill® gasoline cans are tested and certified to ASTM F-852-99 standard specification for portable gasoline containers for consumer use and our diesel and kerosene cans are tested and certified to ASTM F-976-02 standard specification for portable kerosene and diesel containers for consumer use.

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 4.3 out of 5 by 63.
Rated 5 out of 5 by from a suprisingly powerful machine i just bought mine last saturday a week ago on their special deal that they have goin on it i bought it thinkin it was gonna be a real wimp machine but once i started it up and ran it awhile cuttin what was able to be cut so far it really suprised me it's got plenty of power for doin most things although things havent grown much yet around here it did power through anything i took it to and i have no doubt in my mind that it would cut down hay sized stuff once the grass gets high enough although it isnt as powerful as an fs130R or either one of the 131's all 3 of which i also have it seems to do a pretty good job but there is one small gripe although a small one an annoying gripe all the same and that is that when ya go to change the string on mine one of the eyelets fell out i know it doesnt happen with all machines but some of these heads stihl makes or outsources to these heads arent quite the quality they used to be after they made their cosmetic changes on alot of these machines the eyelets in the heads will fall out so make sure ya dont lose em if and when they fall out but anyways do i recommend this machine ? yeah i do i highly recommend it it has more than enough power for most people so dont wait people get to your local dealer and buy one
Date published: 2018-04-08
Rated 5 out of 5 by from Packed with great features! FS 91 R has the features and power I need to get my work completed. Easy operation with the maneuverability to work around all the obstacles I encounter. Love the easy operation, power and durability that Still has always provided me. Looking forward to the many years of service that it will provide just like the last one I owned.
Date published: 2018-04-07
Rated 3 out of 5 by from Poor trimming head Trimming head is not good for commercial use - cheaply made and does not work well
Date published: 2018-04-04
Rated 5 out of 5 by from Top of the heap I've never had a problem with this trimmer. It starts quick every time. It has more power than I thought possible for a small engine. I'm a home owner with an average yard and I'm sure this is the last trimmer I will ever need.
Date published: 2018-04-03
Rated 3 out of 5 by from Cheap Trimmer Head Design I have the Stihl FS-90R, since purchasing this machine I have had nothing but problems with the head spool either it won't release new string or it snaps off causing me to remove the head cover, it takes me longer to do my yard with this machine than it does with my than it does with my old sears electric model, they seriously need to go back to the drawing board on this one.
Date published: 2018-04-03
Rated 4 out of 5 by from Poor Quality trimmer head; great engine I have owned other trimmers. My Stihl has twice the power and is extremely easy to start. I love it. Unfortunately, the head that came with my FS 91 R is significantly inferior to my older Speed – Feed High Capacity head which reloaded without disassembling. More Importantly, the head does not jam like the Stihl. I tried different tensions on the line when reloading but still the same problem – jamming which causes me to disassemble the head.
Date published: 2018-03-20
Rated 4 out of 5 by from Pretty good for a lawn care business I would recommend buying this weedeater. There is tons of power, little vibration and an auto choke which makes it easy to use. Although there is a lot of power you barely have to push the trigger for full power which makes it easier but then it really wastes the trigger. I've pushed the trigger all the way down and the engine cuts up so it's really not good for the engine. Other than that it is pretty light and pretty reliable. Tip: when you first get it do not use it at full power break it in.
Date published: 2018-03-19
Rated 3 out of 5 by from Ditch the 91r and start making the FS 90r again. The old saying "if it aint broke don't fix it" applies here. The changes made from the 90 to 91r, are not significant enough to make any difference in usability. They use the same amount of gas and are not any lighter in weight. I run a mid size landscaping company and use mostly Stihl power tools. Last year we purchased 4 new trimmers which turned out to be the FS 91r. I will never buy a new model first year out again. Stihl knows the issues, as I'm sure they've been filling a lot of warranty requests for the new model. All four trimmers I bought last April 2017 had to be taken in for warranty work within months of purchase. Mainly due to the shaft coming warn at the clutch and failing to spin the head. My other gripes are that the small changes to some parts in the engine are cheaper and not as durable. Now they're hard to find because most suppliers have not switched over to the new model. Lastly, now I have four 90's and four 91's so I have to order different parts for essentially the same machine. This year I'll probably look into older models used on EBay to add to my fleet.
Date published: 2018-03-07
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