Panari FS91R Trimmer Head for STIHL FS70R FS94R FS90 FS90R FS55 FS55R FS56 FS56RC FS70 FS85 FS91 FS91R FS94 FS100RX FS130 FS250 String Trimmer Weedeater Replace 25-2 40027102108

What It Is

The Panari FS91R Trimmer Head is a replacement bump-feed string trimmer head designed for a wide range of STIHL curved- and straight-shaft trimmers. It replaces the OEM 25-2 head (part 40027102108) and is used for general lawn edging, trimming grass, and light weed control.

Fitment & Compatibility

• Compatible STIHL models: FS55, FS55R, FS56, FS56RC, FS70, FS70R, FS85, FS90, FS90R, FS91, FS91R, FS94, FS94R, FS100RX, FS130, FS250. Also fits FS38, FS40, FS45, and FS46 trimmers.
• OEM part replaced: 25-2 head (STIHL part #40027102108).
• What to check before buying:
  • Shaft size: Ensure your trimmer has a 10mm (M10 x 1.25 LH) threaded shaft. This head will not fit smaller 8mm or larger 12mm shafts.
  • Trimmer type: Works on both curved and straight shafts, but not on battery-powered or Kombi-system models without an adapter.
  • Line size: Accepts 0.080" to 0.095" trimmer line (most common sizes). Do not use thicker 0.105" or 0.130" line—it will jam.
• Aftermarket note: This is a direct replacement for the OEM head but is made by Panari. It uses the same bump-feed mechanism and mounting hardware.

Key Things to Know

• Quality: 4.0/5 stars from 93 reviews. Most users report it works well for the price, but a few note the plastic feels slightly less durable than OEM.
• Installation difficulty: Easy—takes 5 minutes. Remove the old head (counterclockwise), install the new head (clockwise), and load line. No tools needed beyond a screwdriver to press the spool lock.
• Common gotcha: The bump-feed button may stick if you overfill the spool. Load no more than 15–20 feet of line per chamber.
• Line loading: This head has two chambers. Use the arrow guides on the spool to feed line—don’t force it. If line breaks inside, you’ll need to disassemble to clear jams.

Should You Buy It

Buy the Panari FS91R if you want a budget-friendly, direct replacement for a worn-out OEM 25-2 head on a compatible STIHL trimmer. It’s ideal for homeowners or light commercial use—just avoid it if you regularly trim heavy brush or need the extra durability of a premium metal head.