Identify Your Model
How to Read Stihl Model and Serial Labels
Updated 2026-05-20
A model-identification guide for Stihl saws and trimmers, focused on avoiding wrong-family parts and serial-range mistakes.
Model Family Is Only the First Step
A label such as MS 170, MS 250, FS 55, or BG 86 narrows the equipment family, but production changes can still affect service parts.
Use the exact model, serial range, and the old part number together when ordering carburetors, primer bulbs, covers, or fuel-system kits.
Serial Range Can Change Fitment
Some Stihl service parts split by serial number or production revision, especially primer bulbs, carburetor variants, and fuel-system components.
If a listing mentions an early or late serial range, compare it to the number stamped on your equipment before buying.
Check the Removed Part
When the label is worn, the removed part can still provide carburetor numbers, casting marks, filter shape, or thread details.
Use those physical checks as a second confirmation instead of assuming all parts in the same Stihl family interchange.