Stihl engine series 1143 · PRO · in production
MS 241 · MS 251
Displacement42.6–45.6 cc
Guide bar14–18″
Chain.325″ · .050–.063″
Production2013→now
Chains & bars that fit the MS 241 · MS 251
Pitch & gauge .325″ · .050–.063″ · recommended bar 14–18″ · 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 (4)
| Model | Years | Market | Rarity | Notes |
|---|---|---|---|---|
| MS 241 C-M | 2014–18 | EU/Global | Uncommon (US) | M-Tronic, 42.6 cc |
| MS 241 C-MQ | 2014–18 | EU | Scarce | + QuickStop Super |
| MS 251 | 2013→now | Global | Current / Very Common | |
| MS 251 C-BE / Wood Boss | 2013→now | Global | Current / Very Common | Easy2Start + quick tensioner |
Data confidence
Provenance for this family's figures — verify anything tagged estimated, approx, or stale-risk against STIHL spec sheets.