Reference · powerhead identification
Powerhead, model name, engine series: what is the difference?
On this site, the 4-digit engine series is the organizing key because it is the closest public shorthand for a shared powerhead platform: bore/stroke family, crankcase generation, and core parts architecture. The sales name is what users search; the series number is what prevents bad fitment assumptions.
Powerhead
The engine/body unit before bar and chain: crankcase, cylinder, ignition/fuel system, handles, clutch side and oiling hardware.
Engine series
The 4-digit STIHL family number used throughout this guide. It groups related models, but it does not make every part interchangeable.
Model name
The retail label: MS 250, 038 Magnum, MS 261 C-M. Names can include suffixes for features, markets, or electronic systems.
The rule that protects fitment
Parts do not safely interchange just because two saws share displacement, pitch, or a familiar model number. Use the series page for family context, then verify the exact model, serial range, and installed bar/chain before ordering parts.
Examples
| Series | Family | Why it matters |
|---|---|---|
| 1123 | 021/023/025 · MS 210/230/250 | One powerhead family can include several sales names and suffixes; the series page keeps those variants together with shared fitment caveats. |
| 1141 | MS 261 · MS 271 · MS 291 | One powerhead family can include several sales names and suffixes; the series page keeps those variants together with shared fitment caveats. |
| 1128 | 044/046 · MS 440/460/461 | One powerhead family can include several sales names and suffixes; the series page keeps those variants together with shared fitment caveats. |
How to identify yours
- Read the model badge and suffix letters; decode suffixes on the model codes page.
- Find the matching model in Browse models.
- Open the series page to see displacement range, bar mount, chain spec, production span, and data confidence.
- For bars and chains, confirm pitch, gauge, and drive-link count stamped on the installed bar.
- For service parts, treat the table as a starting reference and verify by serial-specific parts lookup.
This is why the hub chart remains affiliate-free while browsing: first identify the powerhead family, then use the model or family page when you are ready to match parts.