STIHL FS 91 R Professional String Trimmer, 4-MIX Engine, Loop Handle
The FS 91 R is STIHL's professional loop handle trimmer for long days on fence lines, ditches and commercial properties: a 1.7 cubic inch 4-MIX engine rated at 1.30 bhp, a 12 pound dry weight, a 24 fluid ounce translucent tank and a fully lined drive shaft that also takes a brush blade. Sold by Peach Country Tractor, an authorized STIHL dealer with two South Jersey stores. Every unit is assembled, fueled and started before it leaves.
Why Landscapers Run the FS 91 R
- STIHL 4-MIX engine. A four stroke that runs on standard two stroke mix, so there is no separate oil sump, with more torque than a comparable two stroke.
- Easy starts. Purge pump primer, semi automatic choke and a One Touch Stop switch; STIHL rates it at fewer pulls after a break.
- Long service intervals. A vertical pleated paper air filter extends engine life and the time between cleanings, per STIHL.
- Built for all day use. Padded double shoulder harness, loop handle with the multi function control handle, and a corrosion resistant polymer housing.
- More than string. The fully lined drive shaft and heavy duty steel on steel clutch let it swing a brush blade as well as a trimmer head.
- Made in America. STIHL states that most STIHL products sold in America are built in America.
STIHL FS 91 R Specifications
Figures are from STIHL USA's FS 91 R page. Anything STIHL does not publish online is marked "Not published".
| Engine | STIHL 4-MIX, 1.7 cu in (27.2 cc) |
| Power output | 1.30 bhp |
| Weight | 12 lb without fuel, cutting tool or guard |
| Fuel tank | 24 fl oz, translucent |
| Fuel | Regular unleaded with no more than 10 percent ethanol, mixed with STIHL two stroke oil per the manual |
| Cutting circle | 16.5 in |
| Compatible heads | AutoCut C 26-2, AutoCut 27-2, TrimCut C 32-2, FixCut 31-2, DuroCut 20-2, SuperCut 20-2 |
| Handle | Loop handle (R) with multi function control handle |
| Drive shaft | Fully lined solid drive shaft |
| Harness | Padded double shoulder harness included |
| STIHL part number | 4180 200 0506 US |
| Warranty | Not published on the product page; ask us for STIHL's current warranty terms |
| California | Not available for sale in California |
What It Replaces and What Fits
- Step up from the FS 56 and FS 70. Same loop handle layout with more power and the 4-MIX engine, for crews and large properties.
- Brush blade capable. Fit a STIHL grass or brush blade with the matching guard for saplings and heavy weeds along fence lines.
- Line and heads in stock. We stock AutoCut heads, STIHL trimmer line in the right diameters and the harness and guards at both stores.
Quick Answers
Is the FS 91 R a two stroke or four stroke?
It is a STIHL 4-MIX four stroke that runs on 50:1 two stroke mix, so you fuel it exactly like a two stroke.
What is the difference between the FS 91 and FS 91 R?
The R is the loop handle version; the FS 91 has a bike handle for brush cutting with a blade.
Do you assemble it?
Yes. We put the head and guard on, fuel it with STIHL MotoMix if you like, start it and go over it with you.
Can I buy it online?
STIHL power equipment is sold in store, not shipped. Call either store and we will hold one for you to pick up.
Peach Country Tractor, South Jersey
Available at both stores: 749 Mullica Hill Road, Mullica Hill, NJ 08062 ((856) 589-3953) and 1463 N Tuckahoe Road, Williamstown, NJ 08094 ((856) 226-3834). Call ahead and we will hold one for you. We set up and start every unit before it leaves, and the Mullica Hill shop services what we sell. Serving Sewell, Washington Township, Glassboro, Mullica Hill, Williamstown, Turnersville, Woodbury, Deptford, Swedesboro, Mantua, Pitman, Franklinville, Monroe Township, Vineland, Hammonton, Cherry Hill, Marlton and Voorhees.
Need help picking a trimmer?
Tell us the property and we will match you to the right STIHL model and head. Call (856) 589-3953 or send us a message.