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FS 91 R

FS 91 R
A professional trimmer packed with features for simplified and convenient trimming.

Model Features

  • 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.

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  • Built in the USA
    Indicates products that are built in the United States from domestic and foreign parts and components.

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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.
  • Protected Spark Arrestor Muffler
    Has large baffles which reduce noise level and contains a screen designed to reduce the emission of sparks.
  • Heavy-Duty Steel-On-Steel Clutch
    Centrifugal clutch is designed to reduce slippage.
  • Protected or Enclosed Control Cables
    Eliminate dangling and loose wires.
  • Air Filter Cover
    Easily removed for fast and easy filter cleaning or replacement.
  • Throttle Trigger Interlock
    Must be depressed before the trigger can be activated.
  • Start/Run/Stop Controls on Handle
  • Protected Choke Lever/Knob
    Helps prevent damage.
  • High Tech Polymer Housing
    Housings are lightweight, withstand greater impact and are corrosion-resistant.
  • Fully Lined Drive Shaft
    Provides smooth operation and less vibration.
  • Adjustable Front Handle
    Adjusts for comfort.

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.

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.

Reviews

FS 91 R is rated 4.6 out of 5 by 29.
Rated 5 out of 5 by from Worth every penny! Worth every penny! 1 year going strong and handles the serious weeds.
Date published: 2017-07-14
Rated 2 out of 5 by from Power as advertised but hard start and rough to no idle I purchased this trimmer new from my local dealer after reading the reviews and doing lots of research that I didn't think I needed since I believe strongly in the brand because I have been running Stihl chain saws for over 20 years. That said, I am VERY disappointed. For once I actually took the time to read the manual and follow the break in steps. It has been hard to start and has ran rough from day one and although I thought it would get better after break in, it has not. I was actually able to see the shaft flexing from vibration while waiting for it to warm up (yes, fresh gas and Stihl oil). I am in Ga. so when I'm trimming, its not warm out, its HOT. I broke the unit in and adjusted the idle as per the manual, however, it either over-revs at idle, or stalls within about 30 seconds of idle time. As for the bump head, as other reviews have stated it could be better but I would be happy if it would run long enough at idle to go from a tree to landscape edge and not have to re-start or keep it running at half throttle. I do agree the power and torque are remarkable at speed, but what good is it if it wont stay running? I have no problem paying a premium for a quality product and in fact I would rather do that than have problems, I just don't like having to do both. I will be returning this to my dealer and hope they make it right.
Date published: 2017-07-04
Rated 5 out of 5 by from I can't imagine a better trimmer I just purchased the 91 R and I'm glad I did. I carried it straight to the farm and put it to the test. It performs great! I recently bought a Farm Boss chainsaw and it's what made me want to stay with Stihl, I love it. I spent over two hours with my new 91 in a wet highway ditch and around my pond, cut waist high weeds. Even getting the lines in the water wouldn't bog it down. It was quite and smooth to run , and it started on the first easy pull every time. That is a must! Believe or not, the whole time was on the 3/4 tank of fuel that came in it! When I was done I wasn't 'buzzing' all over. I'm very happy and impressed, and can't wait to try the saw blade out in the brush.
Date published: 2017-06-21
Rated 5 out of 5 by from Great trimmer for the price Purchased 1 year ago. Still starts on the first pull and has had 0 problems. If your tired of buying junk ones every year then get a Stihl.
Date published: 2017-06-17
Rated 5 out of 5 by from Great product but for the price it could be better I love this trimmer. The power and reliability is on point. It will cut anything. For the price I wish the safety guard could be re engineered. I know stihl engineers could do better. The string can not get long enough. When the line breaks it sucks right I to the line head. Other than this small problem this trimmer is great.
Date published: 2017-06-14
Rated 5 out of 5 by from pOWERFUL ,YET LIGHTWEIGHT WITH AN EASY START nEIGHBOR WHO IS A PROFESSIONAL LANDSCAPER TOLD ME THAT FOR TRIMMING MY STEEP SLOPE DOWN TO THE LAKE i SHOULD BUY A QUALITY STIHL TRIMMER.. GLAD i TOOK HIS ADVICE THIS IS MY SECOND YEAR AND THIS TRIMMER IS VERY POWERFUL FOR LARGE WEEDS AND WITH EASY START IT MAKES IT SINGLE PULL TO START.. BOUGHT MY STIHL FROM lECHER fARM SERVICES AND THE INSTRUCTION AND THOROUGH DETAIL HAS PAID OFF TIME AND AGAIN. tHIS YEAR i BOUGHT A CHAIN sAW AND RECEIVED A VERY THOROUGH TRINING AND CAUTION .
Date published: 2017-06-05
Rated 5 out of 5 by from Awesome machine I bought this trimmer 1 year ago loved it .I picked up a friends trimmer 131r. I used his trimmer 2 time's i trim about 5 acres plus other side jobs aswell. I traded 91r to purchase 131r i was blown away by the power what a difference. I cut waist high weeds heavy brush use circular saw blade on both trimmers cutting trees 3.5 in diameter the weight isn't much different. I run non ethanol stihl mix only. I highly recommend stihl product's.
Date published: 2017-06-05
Rated 5 out of 5 by from Incredible power Upgraded from an Echo GT-225 to the FS91R. First time I started the Stihl up I laughed at the torque compared to the echo. I realize I'm comparing two completely different machines but it feels like I went from a Prius to a diesel truck. The manual states you need to run 4-5 tanks of gas through the trimmer to reach full power. I can't wait. I've managed to find reasons to weed wack 3 nights in a row after work. Love it.
Date published: 2017-05-31
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Standard Features

  • Common Features for Trimmers
    View the features common to many STIHL trimmers.

You Will Also Need

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Support

Read what our customers say about STIHL Trimmers
STIHL Trimmers & Edgers, the Right Tools for the Job - Video
How to Wind a STIHL Trimmer Head - Video
Cutting Heads & Blades Selection Chart (PDF)
FS 91 R Instruction Manual (PDF)
Download Instructions on How to Rewind Your Trimmer Head (PDF)
Product Safety Manual (PDF)
STIHL Limited Warranty
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