Stihl engine series 1144 · XL · in production
MS 661 (MAGNUM®)
Displacement91.1 cc
Guide bar20–36″
Chain3/8″ · .063″ · .404″ on long bars
Production2014→now
Chains & bars that fit the MS 661 (MAGNUM®)
Pitch & gauge 3/8″ · .063″ · .404″ on long bars · recommended bar 20–36″ · round file 7/32" (5.5 mm)
Files, oil & sharpening
Suggested match: Oregon 72/73/75 EXL. 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 (6)
| Model | Years | Market | Rarity | Notes |
|---|---|---|---|---|
| MS 661 | 2014→ | Global | Current | Non-electronic, standard carb (per Stihl USA) |
| MS 661 C-M | 2014→ | Global | Current / standard | M-Tronic engine management |
| MS 661 R | 2014→ | Global | Current | Wrap handle, non-electronic |
| MS 661 R C-M | 2014→ | Global | Current | Wrap handle + M-Tronic |
| MS 661 C-M VW | 2014→ | EU/Nordic | Uncommon | Heated handles (cold-climate) |
| MS 661 C-M Magnum | US label | US | Common (US) | ⚠ US marketing name; identical to C-M |
Data confidence
Provenance for this family's figures — verify anything tagged estimated, approx, or stale-risk against STIHL spec sheets.