FS 91

Petrol brushcutter for landscape maintenance with 4-MIX engine and bike handle

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 £582.00*
  • Technical data
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    Technical data Value
    Standard cutting tool AutoCut mowing head C 25-2, GSB 230-2
    CO² ­ g/kWh 877
    Displacement cm3 28.4
    Weight kg 1) 5.8
    Power output hp 1.3
    Sound power level dB(A) 2) 107
    Sound pressure level with plastic tool dB(A) 2) 96
    Sound power level with metal tool dB(A) 2) 107
    Vibration value, right with plastic tool m/s2 3) 4.5
    Performance kW 0.95
    Vibration value, left with metal tool m/s2 3) 5
    Tank volume l 0.71
    Cutting diameter mm 420
    Sound pressure level with metal tool dB(A) 2) 94
    Vibration value, left with plastic tool m/s2 3) 5.5
    Vibration value, right with metal tool m/s2 3) 4.3
    Total length cm 4) 180

    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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    • Grass cutting blade (2 blades)
      Grass cutting blade (2 blades)

      Steel double blade, reversible. For working on areas of tough grass.


      230 mm – 2 B – for FS 55 R / FS 55 / FS 56 RC-E / FS 56 C-E / FS 70 RC-E / FS 70 C-E / FS 91 / F S 111 / FS 131 / FSA 130 / FSA 130 R / FS 94 RC-E / FS 94 C-E / FSA 90 R / FSA 90 / FS 240 C-E / FR 131 T / FR 460 TC-EFM


      260 mm – 2 B – for FS 91 / F S 111 / FS 131 / FSA 130 / FSA 130 R / FS 94 RC-E / FS 94 C-E / FSA 90 R / FSA 90 / FS 240 C-E / FR 131 T / FR 460 TC-EFM

      Versions Price
      260 mm (2 B) £22.50* Save and compare
      Save and compare
  • Accessories
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    • Chest belt

      Chest belt for ADVANCE universal harness and backpack blowers. Ensures the shoulder straps are securely positioned.

      Versions Price
      Chest belt ADVANCE £8.10* Save and compare
      Save and compare
  • Documents
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    Owners manuals

* Manufacturer's recommended retail price updated as of February 2021. 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.