[Lifetime Warranty] 25-2 Trimmer Head 4002-710-2191 - Compatible with Stihl FS55, FS55R, FS56, FS56RC, FS70, FS70R, FS80, FS85, FS90, FS90R, FS91R, FS94R, FS100RX, FS110, FS111R, FS111RX, FS120 - Replaces 4002-710-2108 - Pack of 2
Set of two 25-2 trimmer heads for Stihl string trimmers with pre-installed orange cutting line.
Infographic showing dimensions and specifications for 25-2 trimmer head compatible with Stihl string trimmers.
25-2 Trimmer Head for Stihl brushcutters with compatibility and part number information chart.
Diagram showing the internal structure of a 25-2 trimmer head with labeled spool, cover, eyelets, and knob components.
Close-up details of 25-2 trimmer head showing ABS plastic housing, metal mounting point, and orange PVC cutting line.
25-2 trimmer head replacement for Stihl string trimmers shown in a promotional graphic with a person using a trimmer.
25-2 Trimmer Head components and assembled Stihl trimmer showing common repair symptoms.
Infographic showing 25-2 trimmer head maintenance tips for Stihl compatible string trimmers.
Instructional graphic showing the installation process for a 25-2 trimmer head on a Stihl grass trimmer.
Set of two 25-2 trimmer heads for Stihl string trimmers with pre-installed orange cutting line.
Infographic showing dimensions and specifications for 25-2 trimmer head compatible with Stihl string trimmers.
25-2 Trimmer Head for Stihl brushcutters with compatibility and part number information chart.
Diagram showing the internal structure of a 25-2 trimmer head with labeled spool, cover, eyelets, and knob components.
Close-up details of 25-2 trimmer head showing ABS plastic housing, metal mounting point, and orange PVC cutting line.
25-2 trimmer head replacement for Stihl string trimmers shown in a promotional graphic with a person using a trimmer.
25-2 Trimmer Head components and assembled Stihl trimmer showing common repair symptoms.
Infographic showing 25-2 trimmer head maintenance tips for Stihl compatible string trimmers.
Instructional graphic showing the installation process for a 25-2 trimmer head on a Stihl grass trimmer.
Lifetime Warranty

[Lifetime Warranty] 25-2 Trimmer Head 4002-710-2191 - Compatible with Stihl FS55, FS55R, FS56, FS56RC, FS70, FS70R, FS80, FS85, FS90, FS90R, FS91R, FS94R, FS100RX, FS110, FS111R, FS111RX, FS120 - Replaces 4002-710-2108 - Pack of 2

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25-2 Trimmer Head 4002 710 2191 - Pack of 2

Key Features

  • Package contains two (2) trimmer heads.
  • Semi-automatic, bump-feed line advance system.
  • Constructed from high-impact plastic for durability.
  • Designed for simplified line reloading without head disassembly.
  • Arbor Size: 10mm x 1.0 Left Hand Female (LHF).

Replaces / Cross-Reference Part Numbers

  • 4002 710 2191
  • 4002 710 2108
  • 4002 710 2168

Compatibility & Fitment

Fits specific Stihl string trimmer models including:

  • FS 44, FS 55, FS 55 R, FS 56, FS 56 R, FS 56 CE, FS 56 RC, FS 56 RCE
  • FS 70, FS 70 R
  • FS 80, FS 85
  • FS 90, FS 90 R, FS 91 R, FS 94 R
  • FS 100 RX, FS 110, FS 111 RX, FS 120, FS 130, FS 131
  • FS 250
  • FR 108

When to Replace

  • Visible cracks, chips, or significant wear on the head housing.
  • Failure of the bump-feed mechanism to advance line.
  • Worn-out line eyelets causing premature line breakage.
  • Excessive vibration during operation that is not related to the engine.

Installation Tips

  • Disconnect the spark plug wire before performing any maintenance.
  • Insert a locking pin or small screwdriver into the designated hole on the gear head to prevent the shaft from turning.
  • Unscrew the old trimmer head by turning it clockwise.
  • Screw the new trimmer head on counter-clockwise until it is hand-tight.
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  • FIX TRIMMER'S SYMPTOMS

    FIX TRIMMER'S SYMPTOMS

    Stuck/Tangled/ Broken trimmer head, The trimmer does not spin, The threads are stripping, Uneven Trimming, Excessive Vibration
  • SAVING SOLUTION

    SAVING SOLUTION

    Enjoy the great feeling when your trimmer is repaired and works like before - BlueStars brings DIY solutions to help you deal with any trouble
  • MAINTENANCE TIPS

    MAINTENANCE TIPS

    Regular Cleaning. Inspect the Trimmer Line & Keep surplus trimmer line around. Check the Air Filter & Fuel/Oil. Store Trimmer Appropriately
  • IMPORTANT NOTE

    IMPORTANT NOTE

    This is a replacement part designed to be compatible with certain appliances. Any brand names mentioned are used solely to indicate compatibility
EASY INSTALLATION

EASY INSTALLATION

1. Block the shaft with a stop pin; 2. Screw the trimmer head counterclockwise until it touches the base; 3. Tighten the trimmer head while the shaft is blocked; 4. Unlock the shaft. Test running for 5 mins to ensure proper operation.
#1 SOURCE OF HIGH-QUALITY REPLACEMENT PARTS

#1 SOURCE OF HIGH-QUALITY REPLACEMENT PARTS

Enjoy the comfort that our small yet mighty parts simplify your gardening experience - BlueStars brings DIY solutions to help deal with any trouble!
Brand Model Number
Replace part number 25-2, 4002 710 2108, 4002 710 2191, 40027102108
Stihl FS44, FS55, FS55R, FS56 (From 2008), FS56RC, FS56RCE, FS70, FS70R, FS74, FS76, FS80 (From 1996), FS80R, FS83, FS85, FS85R, FS87, FS90 (From 2005), FS90R, FS91, FS91R, FS94, FS94R, FS100, FS100RX, FS110, FS111R, FS111RX, FS120, FS130, FS130R, FS131, FS131R, FS200 (From 1997), FS240, FS250, FS260R, FS460R (From 2011)
Stihl FR85, FR85T, FR106, FR108, FR130T, FR220, FR350, FR410, FR450, FR460, FR480, FSA90R, FSA130R, FSA135, FSA135R, KM55, KM55R, KM56, KM56R, KM85, KM85R, KM90, KM90R, KM94, KM100, KM100R, KM110, KM110R, KM120, KM130, KM130R, KA85, KA85R, KR85, FS-KM
Fitment Backpack Brushcutters, Brushcutters, Clearing Saws, Electric Trimmers, Kombi Engines, Kombi Tools

FAQ

This head is compatible with a wide range of Stihl equipment, including FS44, FS55, FS55R, FS56, FS56RC, FS70, FS70R, FS80, FS83, FS85, FS90, FS90R, FS91R, FS94R, FS100, FS100RX, FS110, FS111R, FS111RX, FS120, FS130, FS200, FS240, FS250, KM55, KM56, KM85, KM90, KM110, and KM130 models.
This 25-2 trimmer head replaces OEM part numbers 4002-710-2191, 4002-710-2108, 4002-710-2168, and 4002-713-9608.
This AutoCut 25-2 head is designed to accommodate .080", .095", and .105" diameter trimmer line.
You should consider replacing the head if you notice excessive vibration, difficulty with the bump-feed mechanism, or if the plastic housing has become worn, cracked, or damaged from contact with rocks and concrete. A damaged head can lead to uneven line feeding and increased strain on the trimmer's engine.
The head features a 10mm x 1 LHF (Left Hand Female) thread. To install, ensure the engine is off and the spark plug wire is disconnected. Use a locking pin or screwdriver to lock the trimmer gear head in place, then unscrew the old head by turning it clockwise (since it is a left-hand thread). Screw the new head on by turning it counter-clockwise until secure.
The most common cause is debris buildup inside the head or the line becoming tangled or welded together on the spool due to heat. Regularly clearing grass clippings from the head and ensuring the line is wound neatly without overlapping can prevent most feeding issues.