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.