Stihl engine series 1139 · HO · in production
MS 171 · 181 · 211
Replaced in EU/US by the 1148 series (MS 172/182/212) from 2022.
Chains & bars that fit the MS 171 · 181 · 211
Pitch & gauge 3/8″ Picco / .325″ · recommended bar 14–18″ · bar mount 3005 / A074 · round file 5/32" (4.0 mm)
Chain & bar by length
| Bar | Drive links | Shop |
|---|---|---|
| 14″ | 50 DL | Chain → Bar · 3005 → |
| 16″ | 55 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 90/91-series (e.g. 91PX). 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 |
| H screw (high speed) | 3/4 turn |
| LA screw (idle stop) | 2 turns |
| Confidence | sourced |
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. 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 (3)
1,011 part numbers across 43 exploded views — the Diagrams column goes straight to them.
| Model | Years | Market | Rarity | Diagrams | Notes |
|---|---|---|---|---|---|
| MS 171 31.8 cc | 2009→now | EU/Global | Current | 13 | 30.1 cc (Ø 37 mm) and 31.8 cc (Ø 38 mm) — the catalogue lists both cylinders |
| MS 181 31.8 cc | 2009→now | EU/Global | Current | 16 | 31.8 cc; all MS 181s are series 1139 (1139 020 xxxx parts) |
| MS 211 / 211 C-BE 35.2 cc | 2009→now | Global | Current | 14 | 35.2 cc homeowner crossover |
Service bulletins (2)
Running changes and fixes STIHL published for this engine family.
Data confidence
Verify anything tagged estimated or approx against STIHL spec sheets.
Something here wrong or missing for the MS 171 · 181 · 211? Report a correction →