Stihl engine series 1143 · PRO · in production
MS 231 · 241 · 251
MS 231/241/251 all carry 1143-prefix part numbers; there is no series "1151".
Chains & bars that fit the MS 231 · 241 · 251
Pitch & gauge .325″ · .050–.063″ · recommended bar 14–18″ · bar mount 3005 / A074 · round file 3/16" (4.8 mm)
Chain & bar by length
| Bar | Drive links | Shop |
|---|---|---|
| 16″ | 67 DL | Chain → Bar · 3005 → |
| 18″ | 74 DL | Chain → Bar · 3005 → |
Drive-link counts come from STIHL's saw-chain catalog. Bar searches include mount 3005 / A074; 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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Factory tuning settings
| Idle speed | 2,800 rpm |
| H screw (high speed) | 3/4 turn |
| Confidence | reconstructed |
Screw figures are turns open from lightly seated. 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 (5)
1,003 part numbers across 47 exploded views — the Diagrams column goes straight to them.
| Model | Years | Market | Rarity | Diagrams | Notes |
|---|---|---|---|---|---|
| MS 231 / 231 C-BE 40.6–42.6 cc | 2011→ | Global | Current / Common | 17 | 40.6 cc to 2013, then 42.6 cc |
| MS 241 C-M 42.6 cc | 2011–18 | EU/Global | Uncommon (US) | 16 | M-Tronic, 42.6 cc |
| MS 241 C-MQ 42.6 cc | 2014–18 | EU | Scarce | 16 | + QuickStop Super |
| MS 251 45.6 cc | 2011→now | Global | Current / Very Common | 14 | 45.6 cc |
| MS 251 C-BE / Wood Boss 45.6 cc | 2011→now | Global | Current / Very Common | 14 | Easy2Start + quick tensioner |
Data confidence
Verify anything tagged estimated or approx against STIHL spec sheets.
Something here wrong or missing for the MS 231 · 241 · 251? Report a correction →