FS 91 R - $329.95 DSRP SAVE $30.00 on select models

Distributor Suggested Retail Price
FS 91 R

DSRP: $329.95 $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.
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 4.4 out of 5 by 58.
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
Rated 5 out of 5 by from AWESOME! I have two of these in my lawn care setup and they are the best trimmers on the market!
Date published: 2017-12-08
Rated 2 out of 5 by from FS 91 I purchased this product from Ace hardware. My other trimmer was stolen. I wanted the previous model just like the one I purchased 6 months prior. I was given the FS 91 model because the 90 was no longer available. Big mistake buying the FS 91. It’s a pain trying to turn it on. I still don’t fully understand how to turn it on. The 90 model was so simple to turn and easy to maneuver. The price was also overrated. The FS 91 quality is like a residential home owner product. It should not be categorized as a pro product. I wish I can get my money back...
Date published: 2017-11-29
Rated 5 out of 5 by from best value-for-money trimmer on the market starts very quickly, third pull for me. surprisingly light, considering its size. very powerful. love the rubber grips, too. It is a very comfortable trimmer, great for prolonged use. Also, I can cut around 15 yards on one tank of gas. my only complaints are the lack of a detachable shaft, and it can be difficult to disassemble the head to restring it. I have to use a flathead screwdriver. I have used many trimmers, this is the best one. very good trimmer for the money.
Date published: 2017-11-07
Rated 5 out of 5 by from Perfect size I bought this trimmer to clear out shooting lanes. I bought the 3 blade cutter for clearing saplings and briars. The trimmer has plenty of power and not real heavy. Super fuel efficient.
Date published: 2017-11-01
Rated 5 out of 5 by from This product is dependable and powerful This trimmer started right up after the cold winter months. Ran all spring and summer with no issues. LOVE all Stihl products!!
Date published: 2017-10-28
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