Stihl engine series 1141 · PRO · in production
MS 261 · MS 271 · MS 291
Displacement50.2–55.5 cc
Guide bar16–20″
Chain.325″ · .050–.063″ (261 also runs 3/8″)
Production2010→now
Chains & bars that fit the MS 261 · MS 271 · MS 291
Pitch & gauge .325″ · .050–.063″ (261 also runs 3/8″) · recommended bar 16–20″ · round file 3/16" (4.8 mm)
Files, oil & sharpening
Suggested match: Oregon 95-series (95VPX) / 21–22 LPX. Confirm the drive-link count for your exact bar length before ordering. Genuine STIHL chain isn't sold online — these are equivalent aftermarket (Oregon) specs.
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Models in this family (5)
| Model | Years | Market | Rarity | Notes |
|---|---|---|---|---|
| MS 261 | 2010→ | Global | Current | Pro; higher output, 50.2 cc |
| MS 261 C-M | 2014→now | Global | Current | M-Tronic |
| MS 261 C-MQ | 2014–19 | EU | Uncommon | + QuickStop Super |
| MS 271 Farm Boss | 2010→now | Global | Current | 50.2 cc consumer |
| MS 291 Farm Boss | 2010→now | Global | Current | 55.5 cc |
Data confidence
Provenance for this family's figures — verify anything tagged estimated, approx, or stale-risk against STIHL spec sheets.