Stihl FS 91 R Weed Eater: Entry-Level Pro String Trimmer Outdoor Power Equipment Reviews

Stihl FS 91 R Weed Eater: Entry-Level Pro String Trimmer


The Stihl FS 91 R weed eater comes across as a fairly simple string trimmer. But having a basic Stihl weed eater is kind of like having a basic Hitachi framing nailer – there’s still an inherent quality and hidden technology underneath the housing.

A read through the feature list might not impress you, especially if you’re a Pro. It’s a pretty standard list that you’ll find most commercial models share. There’s more to consider than just features, though.

Stihl FS 91 R Weed Eater Engine

Stihl packs a 28.4 cc 4-Mix engine in the FS 91 R. From merely an engine size perspective, it’s right where it needs to be. In Stihl’s professional line, you can go as high as a 36.3 cc engine, though.

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The 4-Mix engine on the Stihl FS 91 R weed eater is an intriguing concept. It’s a 4-stroke engine that still requires you to premix your fuel at a 50:1 ratio. Since not having to premix fuel is one of the major benefits of a 4-stroke engine, it seems a bit odd to go the route Stihl does. But there may be some advantages considering that it’s on a Stihl FS 91 R weed eater.

  • Lower weight since there’s no oil pump, sump, or tank
  • No oil system maintenance
  • Fewer emissions just like any 4-stroke engine
  • Lower noise just like any 4-stroke engine
  • Lugging power and high torque

So there’s a balance to strike and you can certainly make the argument that Stihl’s design is a benefit on a string trimmer.

Stihl FS 91 R Weed Eater: Entry-Level Pro String Trimmer

Fuel Capacity

The Stihl FS 91 R weed eater has a 24-ounce fuel tank – large for a string trimmer with this size engine. A full tank will add weight, but you’ll be stopping to refill it less often.

Price

With a dealer recommended price of $339.95, the Stihl FS 91 R weed eater is at the lower end of the price scale in their professional line of string trimmers. You’ll be able to pick it up from a dealer closer the to the $300 mark.

Given that Stihl’s entire range starts at $290 and runs to $580, this model is really an entry-level Pro product in their book.

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Performance and Place

How does this Stihl weed eater compare to others currently on the market? For that answer, we turn to our team over at OPE Reviews.  They have a standalone review where the FS 91 R earns a 4.2-star rating out of 5.

Stihl FS 91 R String Trimmer Review

To see how it compares to other popular models, take a look at their shootout, where it finished in 4th place overall.

Best Weedeater Shootout – String Trimmers Gas Powered

Stihl FS 91 R Weed Eater Features

  • Reduced emission engine technology
  • Built in the USA domestic and foreign parts
  • Shoulder strap/carrying system compatible
  • Adjustable front handle
  • Fully lined drive shaft
  • High-tech polymer housing
  • Start/Run/Stop controls on handle
  • Throttle trigger interlock (trigger safety)
  • Air filter cover
  • Protected control cables
  • Heavy-Duty steel-on-steel clutch
  • Protected spark arrestor muffler

Stihl Weedeater FS 91 R Specifications

  • Model: Stihl FS 91 R
  • Fuel: Gasoline
  • Fuel Capacity: 24 oz
  • Engine Displacement: 28.4 cc
  • Weight: 12.1 pounds
  • Warranty: 2 years
  • Price: $299 ($339.95 dealer suggested price)

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