STIHL FS 91 Series

Choose Bike Handle or Loop Handle
The FS 91 comes with a bike handle for two-handed control, while the FS 91 R offers a loop handle for tighter maneuverability — same powerhead, your choice of grip.

Identical Power Across Both Models
Both models share the same 1.3 bhp STIHL 4-MIX engine, so you’re choosing a handle style, not sacrificing performance.

Match the Trimmer to Your Work
Pick the handle configuration that suits your terrain and how you like to carry a trimmer through a long day.

Built for Daily Commercial Use
Both the FS 91 and FS 91 R are professional-grade trimmers designed for daily commercial use.

1.7 in³ Displacement, 1.3 BHP
A 1.7 cubic-inch STIHL 4-MIX engine delivers 1.3 brake horsepower with the low-end torque professional trimming demands.

4-Stroke-Like Performance
The 4-MIX engine runs on a gas/oil mix like a 2-stroke but delivers the torque and lower emissions of a 4-stroke.

24-Ounce Fuel Tank
A 24 fluid-ounce fuel tank keeps you trimming longer between fill-ups.

Fewer Engine Rebuilds
The 4-MIX design puts less strain on internal components, meaning fewer engine rebuilds over the life of the trimmer.

16.5-Inch Cutting Diameter
A 16.5-inch cutting diameter covers ground efficiently on every pass.

Tap to Advance Line
The TapAction AUTOCUT 27-2 head advances line with a simple tap on the ground — no bumping or stopping to manually feed line.

Quick, Easy Reloading
The AUTOCUT 27-2 head is designed for quick, easy line reloading when you’re back at the trailer.

Consistent Cut Quality
A reliable line-feed system keeps cutting performance consistent from the first acre to the last.

Padded Double Shoulder Harness
A padded double shoulder harness distributes weight evenly, reducing fatigue over a full day of trimming.

Fully-Lined Solid Drive Shaft
A fully-lined, solid drive shaft delivers smooth power transfer with reduced vibration at the handle.

Multi-Function Control Handle
A multi-function control handle keeps throttle and stop controls centralized and within easy reach.

12-Pound Powerhead
At 12 pounds without fuel or cutting tool, the FS 91 and FS 91 R stay light and maneuverable through long days.

One-Touch Stop
A One-Touch Stop switch shuts the engine down quickly and reliably at the end of a job.

Semi-Automatic Choke Lever
A semi-automatic choke lever simplifies cold starts without extra steps.

Purge Pump Primer
A purge pump primer helps get fuel to the engine quickly for faster starts.

Vertical Pleated Paper Air Filter
A vertical pleated paper air filter extends engine longevity by keeping debris out of the intake.

Heavy-Duty Steel-on-Steel Clutch
A heavy-duty steel-on-steel centrifugal clutch is built to hold up to daily commercial use.

Protected Spark Arrestor Muffler
A protected spark arrestor muffler helps reduce noise while protecting engine components.

Built for Landscapers & Ag Operations
Durable, professional-grade construction holds up to fence lines, ditch banks, and everyday landscaping work alike.

Backed by STIHL Engineering
Every FS 91 and FS 91 R is built to STIHL’s professional-grade standard for reliability season after season.

Backed by Parallel Ag’s Parts & Service Team
Parallel Ag’s expert parts and service team is here to keep your STIHL FS 91 or FS 91 R running at peak performance — with knowledgeable staff across all our locations ready to support you throughout the season.

Genuine STIHL Parts
STIHL replacement parts and cutting heads are made to the same high standards as those used on the assembly line. Talk to your local Parallel Ag parts team to get the genuine parts you need, fast.

Handle Style Guidance
Parallel Ag’s team can help you decide between the bike handle FS 91 and loop handle FS 91 R before you buy.

Financing Available
Talk to Parallel Ag about financing options to get your new STIHL trimmer working for you.