FS 91 Petrol Brushcutter

For working in large areas with tough grass

For working on large areas of tough grass. Simplified starting, bike handle, control handle with stop button, 4-MIX® engine with larger tank for increased cutting time between filling, rigid drive shaft, Supplied with ADVANCE Universal double shoulder harness, metal grass blade and AutoCut mowing head.

Extend your domestic warranty from 2 to 3 years with the purchase of 5 litres of STIHL MotoMix® fuel and this product. Your STIHL Approved Dealer will register your extended warranty on the STIHL warranty database at point of purchase.

Versions Price
FS 91 £622.80*
  • Technical data
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    Technical data Value
    Standard cutting tool AutoCut C 26-2 & GrassCut 230-2
    Displacement cm3 28.4
    Performance kW 0.95
    Power output hp 1.3
    CO² ­ g/kWh 877
    Weight kg 1) 5.8
    Power output kW/bhp 0.95/1.3
    Sound pressure level with plastic tool dB(A) 2) 96
    Sound power level dB(A) 2) 107
    Vibration value, left with plastic tool m/s2 3) 5.5
    Vibration value, right with plastic tool m/s2 3) 4.5
    Total length cm 4) 180
    Cutting diameter mm 420
    Tank volume l 0.71
    Cylinder 4 Takt / Chrom
    Filter Papierfilter
    Handle type Mählenker / Multifunktionsgriff / werkzeuglose Griffeinstellung
    Carburettor Standardvergaser / No Touch Limiter Cap
    Muffler Standardschalldämpfer
    Anti vibration system Einfach AV-System
    Tank cap STV schraub Tankverschluss
    Starter cord Autodekompression / manuelle Kraftstoffpumpe (Purger) / Standard Anwerfgriff

    1) Without fuel, cutting tool and without protection
    2) K-factor according to DIR 2006/42/EC = 2.5 dB (A)
    3) K-factor according to DIR 2006/42/EC = 2m / s ²
    4) Without cutting tool

  • Features
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    Standard features

    • STIHL 4-MIX® engine

      You can always rely on STIHL to keep setting new benchmarks this time with 4-stroke mixed lubrication technology. The STIHL 4-MIX® engine, which runs on a fuel-oil mix just like a 2-stroke, offers the benefits without the compromises of 4-stroke power. STIHL 4-MIX® engine technology provides fast acceleration, more power, added torque, lower noise, reduced emissions and increased fuel efficiency to complete jobs quickly, quietly and more easily.

    • Air filter with long service life

      The easily accessible paper filter with a long service life means it can go for long intervals without changing. (similar to illustration)

    • Manual fuel pump (Purger)

      A small fuel pump delivers fuel to the carburettor at the touch of a button. This reduces the number of starting strokes required following extended breaks in operations.

    • Bike handle

      When used in conjunction with a harness, the bike handle enables a smooth mowing action. The bike handle allows the machine to be easily guided, making it ideal for working on large areas and thus reducing fatigue.

    • Anti-vibration system

      Intense vibration at the handles of power tools can lead to long-term effects on blood vessels in the hands and arms. STIHL has therefore developed an effective anti-vibration system whereby the oscillations from the machine's engine are dampened which significantly reduces vibrations at the handles.

    • Multi-function handle

      All the engine and speed controls are easily accessible and at your finger tips.

    • Tool-free handle adjustment

      The handle bar can be easily adjusted to suit the users working position via the tool-free handle adjustment clamp.

    • ADVANCE Universal Harness

      Soft padding makes work more comfortable during longer jobs.

    • Stop switch

      The multi-function control handle features a stop switch which automatically reverts back to the start position for a quicker, simple restart.

  • Cutting Attachments
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    • AutoCut 2-2 / C 25-2 mowing head
      AutoCut 2-2 / C 25-2 mowing head

      Double lines, for mowing and thinning work. Mowing lines are automatically extended when the mowing head is tapped on the ground.


      AutoCut 2-2 – for FSA 56/FSE 52


      AutoCut C 25-2 – for FS 55 R / FS 56 RC-E / FS 56 C-E / FS 70 RC-E / FS 70 C-E / FS 55 / FS 91 / FS 111 / FS 94 RC-E / FS 94 C-E / FS 131 / FS 240 C-E / FSA 90 R / FSA 90 / FSA 130 R / FSA 130 / FR 131 T / FR 460 TC-EFM

      Versions Price
      AutoCut C 25-2 - 2.4 mm £36.00* Save and compare
      Save and compare
    • AutoCut 36-2 mowing head
      AutoCut 36-2 mowing head

      Double mowing line head for trimming and thinning work. Mowing lines are automatically extended when the mowing head is tapped on the ground. Featuring a low profile for more control and more precise trimming results. Compatible with line diameters of 2.7mm, 3.0mm and 3.3mm.


      AutoCut 36-2 – for FS 131 / FS 240 C-E

      Versions Price
      AutoCut 36-2 - 2.7 mm £45.60* Save and compare
      Save and compare
    • AutoCut C 26-2 mowing head
      AutoCut C 26-2 mowing head

      Double mowing line head for trimming and thinning work. Mowing lines are automatically extended when the mowing head is tapped on the ground. Easy loading system for quick and simple line refill. Featuring a low profile for more control and more precise trimming results. Compatible with line diameters of 2.4mm and 2.7mm.

      AutoCut C 26-2 – for FS 55 R / FS 56 RC-E / FS 56 C-E / FS 70 RC-E / FS 70 C-E / FS 55 / FS 91 / FS 111 / FS 94 RC-E / FS 94 C-E / FS 131 / FS 240 C-E / FSA 90 R / FSA 90 / FSA 130 R / FSA 130 / FR 131 T / FR 460 TC-EFM

      Versions Price
      AutoCut C 26-2 - 2.4 mm £36.00* Save and compare
      Save and compare
    • TrimCut C 32-2 mowing head
      TrimCut C 32-2 mowing head

      FS mowing head with manual line adjustment for semi-professional and professionals who want a robust mowing head. The new trimcut models are an evolution of the previous 31-2 | 41-2 | 51-2 models designed for robustness and efficient use of the line. There are two ways of reload trimmer line; from the outside (C-feature) or conventionally by removing the spool.

      For FS 55 / FS 55 R / FS 56 RC-E / FS 56 C-E / FS 70 RC-E / FS 70 C-E / FS 91 / FS 111 / FS 131 / FS 240 C-E / FSA 90 R / FSA 90 / FSA 130 R / FSA 130 / FR 131 T / FR 460 TC-EFM / FS-KM

      Versions Price
      TrimCut C 32-2 - Ø 2.4 mm £37.50* Save and compare
      Save and compare
    • SuperCut mowing head
      SuperCut mowing head

      Double line, for mowing and thinning work. Mowing lines are automatically adjusted for optimal cutting length.


      SuperCut 20-2 – for FS 55 R / FS 56 RC-E / FS 56 C-E / FS 70 RC-E / FS 70 C-E / FS 55 / FS 91 / FS 111 FS 94 RC-E / FS 94 C-E FS 131 / FS 240 C-E / FSA 90 R / FSA 90 FSA 130 R / FSA 130 / FR 131 T FR 460 TC-EFM


      SuperCut 40-2 – for FS 360 C-EM / FS 410 C-EM / FS 460 C-EM / FS 460 C-EM L / FS 490 C-EM

      Versions Price
      SuperCut 20-2 - 2.4 mm £37.50* Save and compare
      Save and compare
    • DuroCut 20-2 mowing head
      DuroCut 20-2 mowing head

      Double or quadruple lines, for mowing and thinning work. Up to four lines can be easily inserted. Compatible with many different sizes and types of mowing line.


      DuroCut 20-2 – for FS 55 R / FS 56 RC-E / FS 56 C-E / FS 70 RC-E / FS 70 C-E / FS 55 / FS 91 / FS 111 / FS 94 RC-E / FS 94 C-E / FS 131 / FS 240 C-E / FSA 90 R / FSA 90 / FSA 130 R / FSA 130 / FR 131 T / FR 460 TC-EFM

      Versions Price
      DuroCut 20-2 £41.30* Save and compare
      Save and compare
    • RG - rotary cutting head
      RG - rotary cutting head

      Tool attachment for brushcutters. For effective removal of weds and grass from various surfaces such as gravel and paved areas. Enables low-spin mowing, for example along roads and around traffic islands. Complete functionality in the attachment gearbox. Powerful cut, tends not to become blocked with cuttings, easy and quick blade change. Fits: FS 91, FS 94, FS 111, FS 131, FSA 130 (reduced performance compared to KMA).

      Versions Price
      RG rotary cutting head £359.00* Save and compare
      Save and compare
    • FH 145° - adjustable scrub cutter
      FH 145° - adjustable scrub cutter

      Light brush cutter attachment for ground-based pruning and mowing in confined areas, the FH 145 allows for more control when cutting grass and scrub. Flexible adjusting of head, space-saving transport position, weight: 1.5 kg. Fits FS 90, FS 100, FS 130 FSA 130 (reduced performance compared to KMA)

      Versions Price
      FH 145° £345.00* Save and compare
      Save and compare
  • Accessories
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    • ADVANCE PLUS universal harness

      With quick release system for fast connection and disconnection of brushcutters. Suitable for FS 50 - FS 560, FSA 90.

      Versions Price
      ADVANCE PLUS universal harness - one size £63.40* Save and compare
      Save and compare
    • ADVANCE PLUS universal harness, fluorescent orange

      High visibility. Perfectly complements protective clothing when mowing in hazardous areas, with a comfort carry ring for quickly attaching and removing the clearing saw, for FS 50 – FS 560, FSA 90 adn FSA 130.

      Versions Price
      ADVANCE PLUS universal harness, fluorescent orange - one size £68.50* Save and compare
      Save and compare
    • ADVANCE forestry harness

      Freely suspended leg protection provides excellent freedom of movement. Extremely ergonomic and comfortable for forestry use with circular saw blades. Very light. Tool bag also available.


      Standard size - for FS 91 – FS 560

      XXL version - for users > 1.90 m in height, for FS 91 – FS 560

      Versions Price
      Standard size £60.00* Save and compare
      Save and compare
    • ADVANCE PLUS forestry harness

      Ergonomically designed harness offering great freedom of movement thanks to the freely suspended leg protection. Very light and with comfort carry ring for quickly attaching and removing the clearing saw. For FS 91 - FS 560.

      Versions Price
      ADVANCE PLUS forestry harness - one size £99.80* Save and compare
      Save and compare
    • ADVANCE X-TREEm forestry harness

      Offering outstanding ergonomic design, specially developed for long periods of forestry work using circular saws. Highly comfortable to wear due to the length-adjustable back section and infinitely variable load distribution between the shoulders and hips, for FS 90 – FS 560, and FSA 90.

      Versions Price
      ADVANCE X-TREEm forestry harness - one size £128.50* Save and compare
      Save and compare
  • Documents
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    Owners manuals

  • Product variations
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* Manufacturer's recommended retail price updated as of January 2022. The manufacturer's recommended retail prices are subject to change without notice.

The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.