FS 91 R - $329.95 DSRP


Distributor Suggested Retail Price
FS 91 R

DSRP: $329.95

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.
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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
  • 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 47.
Rated 5 out of 5 by from Great product! I finally went from box store brand trimmers because they were so under-powered and I was having to replace them all the time for various quality issues. I can do more at quarter throttle with this trimmer than I could at full throttle with the old ones. It's a little heavy, but the power is well worth the extra weight.The trimmer line could be more durable, but switching to the heavier stuff will void warrantee.
Date published: 2017-10-03
Rated 5 out of 5 by from Excellent trimmer, loads of power, low fuel consumption I bought this trimmer one year ago today, and used it to clean up 8 acres of land that had been left vacant for years. I bought the brush cutting blade with it, and it has plenty of power to cut down large saplings without bogging down. Excellent all around trimmer/brush cutter, uses very little fuel. This thing ran nearly non stop for weeks on end, and still is used frequently. Has never failed to start, with no more than two pulls.
Date published: 2017-09-26
Rated 2 out of 5 by from Loss of power I have trusted stihl products and loved them,except this trimmer!!!! Had the same problem of loss of power ,its been in shop four times and they all say varb was gunked up.Then they go on to say it runs great!! Well why after a hour of being out of shop it will not stay at full throttle??? The products are expensive enough i cant afford to have worked on every year!
Date published: 2017-09-20
Rated 4 out of 5 by from Strong and ready for use A little pricey for most consumers, but overall it has the power to tackle most of what I needed it for. Engine gets a little warm up around the top end (Wish they worked a heat deflector into design) when using as I am a tall person. The push to extend line button did not last long before I had to replace it, fuel filter popped out, and gas cap retention line was poorly designed. The motor is strong and reliable: as well as; quick to start and power through "Most" of my yard with ease.
Date published: 2017-09-20
Rated 4 out of 5 by from Should have bought the higher hp model Overall good performing but did bog down a little in heavy grass/brush. I am going to invest in the blades to see if that improves performance. I almost bought the higher hp model just to be sure but did not want to go way over budget.
Date published: 2017-09-19
Rated 5 out of 5 by from This product is as advertised. This product has a lot of power, but more important is that it starts every time. I have no idea why I waited so long to buy this trimmer.
Date published: 2017-09-08
Rated 2 out of 5 by from Won't stay at high throttle I love stihl so don't think I'm writing this to down on stihl. It's just I have recently bought the brand new fs91r and since day one the weed eater would not stay at high throttle when string extended. And I took it in for repair 3 times before someone found the filter was dark brown. Said it was from ethonal in gas and that I got the bottom of the tank. He said to only use 93 or ethonal free gas. Well seeing as ethonal is not at every gas station I have done 93 and now it's doing it again where it don't want to run when string is out. But the past three weeks after it has ran awesome. But now having same issue as before. Still not as good as my old fs90r I had though.
Date published: 2017-09-07
Rated 5 out of 5 by from Product has great power. Trigger to small i like new choke system the weight of product makes it easy to use. Stihl has made sure our dealer is well trained on products.
Date published: 2017-08-26
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