Stihl engine series 1120 · HO
009 · 010 · 011 · 012
No Stihl "09" ever existed — "Mini Boss" was US branding of the 009 (Stihl IPLs: "009 MINI BOSS (USA)"). "Wood Boss" in this era belonged to the 028, not this family.
Chains & bars that fit the 009 · 010 · 011 · 012
Pitch & gauge 3/8″ Picco · .050″ · recommended bar 12–16″ · bar mount 3005 / A074 · round file 5/32" (4.0 mm)
Chain & bar by length
| Bar | Drive links | Shop |
|---|---|---|
| 12″ | 44 DL | Chain → Bar · 3005 → |
| 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 | 10,500 rpm |
| L screw (low speed) | 1 turn |
| H screw (high speed) | 1 turn |
| 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 (6)
1,004 part numbers across 44 exploded views — the Diagrams column goes straight to them.
| Model | Years | Market | Rarity | Diagrams | Notes |
|---|---|---|---|---|---|
| 009 36.6 cc | 1980–97 | Global | Common | 19 | 36.6 cc; sold as "Mini Boss" in the US |
| 009 L ≈40.8 cc | 1982–97 | Global | Uncommon | 19 | 40.8 cc (Fire&Saw/type table; CSCC says 37 — sources conflict) |
| 010 AV / AVE 36.6 cc | 1978–91 | Global | Uncommon | 13 | 36.6 cc |
| 011 AV / AVEQ 41 cc | 1980–96 | Global | Common | 13 | 41 cc; popular homeowner |
| 011 AVT 41 cc | 1984–2004 | EU/Global | Common | 13 | Top-handle; longest run in the family |
| 012 AV / AVE 45.2 cc | 1978–91 | Global | Common | 12 | 45.2 cc |
Data confidence
Verify anything tagged estimated or approx against STIHL spec sheets.
Something here wrong or missing for the 009 · 010 · 011 · 012? Report a correction →