Stihl model · engine series 1141
MS 261 C-M 50.2 cc
- Chain
- .325″ · .050–.063″ (261 also runs 3/8″)
- Recommended bar
- 16–20″
- Mount
- 3003 / D025
Model displacement · family chain/bar fitment. Details & confidence ↓
Parts diagrams (16)
Browse saved diagrams & other models ↗368 parts entries · catalogue coverage: MS 261, MS 261 C. Check the sheet’s variant and serial notes.
Model & family fitment specs
Displacement is specific to the MS 261 C-M roster record. Chain, bar and mount are the published family fitment for engine series 1141; confirm the pitch, gauge and drive-link count stamped on your installed bar before ordering.
Chains & bars that fit the MS 261 C-M
Pitch & gauge .325″ · .050–.063″ (261 also runs 3/8″) · recommended bar 16–20″ · bar mount 3003 / D025 · round file 3/16" (4.8 mm)
Chain & bar by length
| Bar | Drive links | Shop |
|---|---|---|
| 16″ | 67 DL | Chain → Bar · 3003 → |
| 18″ | 74 DL | Chain → Bar · 3003 → |
| 20″ | 81 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 95-series (95VPX) / 21–22 LPX. 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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Service & tuning
Reference service specs
Reference-only service facts. STIHL revised parts by serial number, market, and production revision; verify against the saw label, IPL, or dealer parts lookup before ordering.
| Spark plug | Bosch WSR 6 F · NGK BPMR 7 A |
| Fuel filter | 0000 350 3515 |
| Air filter | 1141 120 1604 (MS 261 / C-M) · 1141 120 1600 (MS 271 / MS 291) |
| Starter rope | 3.5 mm · 38″ |
| Guide coverage | MS 261 · MS 261 C-M · MS 271 · MS 291 |
| Source | 2019 STIHL Technical Reference Guide · sourced |
- HD2 air filter service-kit coverage differs by model and serial range.
Factory tuning settings
| Idle speed | 2,800 rpm |
| LA screw (idle stop) | 1 turn |
| Confidence | reconstructed |
Screw figures are turns open from lightly seated. 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.
About the MS 261 C-M
M-Tronic
Production, market and rarity are specific to this model’s roster record.
Related models in series 1141
Shared engine-family membership does not establish parts interchangeability.
Data confidence
Chain, bar, mount and displacement confidence comes from the shared MS 261 · MS 271 · MS 291 family research.
Something wrong or missing for the MS 261 C-M? Report a correction →