Stihl engine series 1144 · XL · in production
MS 661 (MAGNUM®)
Chains & bars that fit the MS 661 (MAGNUM®)
Pitch & gauge 3/8″ · .063″ · .404″ on long bars · recommended bar 20–36″ · bar mount 3003 / D025 · round file 7/32" (5.5 mm)
Chain & bar by length
| Bar | Drive links | Shop |
|---|---|---|
| 20″ | 72 DL | Chain → Bar · 3003 → |
| 22″ | 76 DL | Chain → Bar · 3003 → |
| 25″ | 84 DL | Chain → Bar · 3003 → |
| 28″ | 91 DL | Chain → Bar · 3003 → |
| 32″ | 105 DL | Chain → Bar · 3003 → |
| 36″ | 114 DL | Chain → Bar · 3003 → |
Drive-link counts come from STIHL's saw-chain catalog. Bar searches include mount 3003 / D025; still confirm the mount stamp, pitch, gauge and drive-link count on your installed bar before ordering.
Files, oil & sharpening
Suggested match: Oregon 72/73/75 EXL. Confirm the drive-link count for your exact bar length before ordering. These are equivalent aftermarket (Oregon) chains, not genuine STIHL chain — STIHL sells its own chain through its dealer network, and we're not affiliated with STIHL. New to fitment? See the bar-mount identification guide and chain & cutter guide.
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Factory tuning settings
| Idle speed | 2,800 rpm |
| Max speed | 13,500 rpm |
| Confidence | reconstructed |
These are the figures every model in this family shares; an individual model page may be more specific. Matched on the base model number rather than this exact variant, so treat it as a starting point. Set the final mixture by ear and tachometer against the machine in front of you — running a two-stroke lean to hit a published number is how pistons get scored.
Models in this family (6)
482 part numbers across 26 exploded views — the Diagrams column goes straight to them.
| Model | Years | Market | Rarity | Diagrams | Notes |
|---|---|---|---|---|---|
| MS 661 91.1 cc | 2014→ | Global | Current | 26 | Non-electronic, standard carb (per Stihl USA) |
| MS 661 C-M 91.1 cc | 2014→ | Global | Current / standard | 26 | M-Tronic engine management |
| MS 661 R 91.1 cc | 2014→ | Global | Current | 26 | Wrap handle, non-electronic |
| MS 661 R C-M 91.1 cc | 2014→ | Global | Current | 26 | Wrap handle + M-Tronic |
| MS 661 C-M VW 91.1 cc | 2014→ | EU/Nordic | Uncommon | 26 | Heated handles (cold-climate) |
| MS 661 C-M Magnum 91.1 cc | US label | US | Common (US) | 26 | ⚠ US marketing name; identical to C-M |
Data confidence
Verify anything tagged estimated or approx against STIHL spec sheets.
Something here wrong or missing for the MS 661 (MAGNUM®)? Report a correction →