Stihl model · engine series 1122
066 91.6 cc
- Chain
- 3/8″ · .063″ · .404″ on long bars
- Recommended bar
- 20–36″
- Mount
- 3003 / D025
Model displacement · family chain/bar fitment. Details & confidence ↓
Parts diagrams (17)
Browse saved diagrams & other models ↗501 parts entries · catalogue coverage: 066. Check the sheet’s variant and serial notes.
Model & family fitment specs
Displacement is specific to the 066 roster record. Chain, bar and mount are the published family fitment for engine series 1122; confirm the pitch, gauge and drive-link count stamped on your installed bar before ordering.
Chains & bars that fit the 066
Pitch & gauge 3/8″ · .063″ · .404″ on long bars · recommended bar 20–36″ · bar mount 3003 / D025 · round file 7/32" (5.5 mm)
Chain & bar by length
| Bar | Drive links | Shop |
|---|---|---|
| 20″ | 72 DL | Chain → Bar · 3003 → |
| 22″ | 76 DL | Chain → Bar · 3003 → |
| 25″ | 84 DL | Chain → Bar · 3003 → |
| 28″ | 91 DL | Chain → Bar · 3003 → |
| 32″ | 105 DL | Chain → Bar · 3003 → |
| 36″ | 114 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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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 3504 |
| Air filter | 0000 140 4402 HD2 |
| Starter rope | 4.5 mm · 39.5″ |
| Guide coverage | 064 · 066 · MS 650 · MS 660 |
| Source | 2019 STIHL Technical Reference Guide · sourced |
- Guide lists MS 650 at 84.9 cc and 066/MS 660 at 91.6 cc.
Factory tuning settings
| Idle speed | 2,500 rpm |
| LA screw (idle stop) | 1/4 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.
About the 066
91.6 cc; era benchmark
Production, market and rarity are specific to this model’s roster record.
Related models in series 1122
Shared engine-family membership does not establish parts interchangeability.
Data confidence
Chain, bar, mount and displacement confidence comes from the shared 064/066 · MS 660 · MS 650/640 family research.
Something wrong or missing for the 066? Report a correction →