Stihl model · engine series 1140
MS 400 C-M 66.8 cc
66.8 cc; first magnesium-piston production saw; M-Tronic
The production, market and rarity details above are specific to the MS 400 C-M roster record. The displacement below is specific to this roster record. The chain, bar and mount are the published family fitment for engine series 1140; confirm the pitch, gauge and drive-link count stamped on your installed bar before ordering.
Model & family fitment specs
Chains & bars that fit the MS 400 C-M
Pitch & gauge 3/8″ · .050–.063″ · recommended bar 16–25″ · bar mount 3003 / D025 · round file 7/32" (5.5 mm)
Chain & bar by length
| Bar | Drive links | Shop |
|---|---|---|
| 16″ | 60 DL | Chain → Bar · 3003 → |
| 18″ | 66 DL | Chain → Bar · 3003 → |
| 20″ | 72 DL | Chain → Bar · 3003 → |
| 22″ | 76 DL | Chain → Bar · 3003 → |
| 25″ | 84 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 | 14,000 rpm |
| Confidence | reconstructed |
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.
Related models in series 1140
Data confidence
Chain, bar, mount and displacement confidence comes from the shared MS 362 · 311/391 · MS 400 family research.
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