Stihl engine series 1122 · XL
064/066 · MS 660 · MS 650/640
Chains & bars that fit the 064/066 · MS 660 · MS 650/640
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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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.
Models in this family (5)
2,135 part numbers across 79 exploded views — the Diagrams column goes straight to them.
| Model | Years | Market | Rarity | Diagrams | Notes |
|---|---|---|---|---|---|
| 064 AV 84.9 cc | 1986–97 | Global | Collectable | 14 | 84.9 cc big-bore |
| 066 91.6 cc | 1988–03 | Global | Very Common / iconic | 17 | 91.6 cc; era benchmark |
| MS 660 91.6 cc | 2004–14 | Global | Very Common | 19 | MS-era 066 |
| MS 650 84.9 cc | 2005–12 | EU/AU | Uncommon (US) | 16 | Slightly smaller; not US-sold |
| MS 640 84.9 cc | 2003–10 | EU/AU | Uncommon | 13 | EU large pro below 660 |
Service bulletins (36)
Running changes and fixes STIHL published for this engine family.
- TI 47/2010 Air filter; Air filter with wire mesh; Summary
- TI 34/2009 Oil pump with higher delivery rate; Carburetor
- TI 10/2008 Clutch, tension spring; Wrap around handlebar, elbow connector; Hand guard; Summary
- TI 44/2007 Filler cap, sealing ring; Summary
- TI 10/2007 Crankcase, Chain sprocket cover; Muffler and gasket, MS 660 only; Grommet; Summary
- TI 64/2005 Clutch, clutch shoes; Summary
- TI 21/2005 Limiter cap; Segment; Spare parts; Removal of the limiter caps; Summary
- TI 15/2005 Tank vent
- TI 10/2005 New STIHL MS 650 Chainsaw
- TI 27/2003 Carburetor; Grommet; Muffler and Gasket; Cylinder with Piston; Summary
- TI 1/2003 New Sales Designation for STIHL 064; Clutch Drum B
- TI 53/2002 New Sales Designation for STIHL 066; Clutch Drum Bearing; Muffler Mounting (Australia and New Zealand only); Summary
- TI 37/2002 Fine Dust Filter (special accessory); Oil Pump (special accessory for 066); Summary
- TI 54/2000 Ignition Systems (Flywheel, Ignition Module); Key
- TI 36/2000 Fuel Pickup Body; Chain Sprocket Cover
- TI 12/2000 Front handle with integral stiffener
- TI 52/1999 Front hand guard; Tank vent; Crankcase; Grommet
- TI 37/1999 066 arctic: Handle heating with optimized heat out
- TI 21/1998 General: Machine Numbering
- TI 2/1998 066: Carburetor; grommet; cylinder with piston; fi
- TI 1/1998 064; 066: Carburetor; Air Filter (filter cover, fi
- TI 36/1997 Tank vent (service note)
- TI 15/1997 Service notes for crankshaft/crankcase/flywheel
- TI 8/1997 Tank housing; tank vent; Air filter; Nameplate; Ch
- TI 43/1996 Dry HD air filter
- TI 2/1996 Crankshaft with larger big end bearing; new crankc
- TI 27/1995 Crankcase/cover; chain brake
- TI 22/1995 Decompression valve; filter cover
- TI 19/1995 066 M: OSHA
- TI 10/1995 HD air filter; cylinder/cylinder gasket
- TI 51/1994 EY-V ignition module; flywheel; carburetor
- TI 45/1994 Elastostart; front handle; rewind starter; chain s
- TI 22/1994 Cylinder gasket; HD filter (prefilter)
- TI 19/1994 Crankshaft; pickup body
- TI 12/1994 Chain sprocket cover/side plate
- TI 8/1994 Carburetor; crankshaft; piston/cylinder; front han
Data confidence
Verify anything tagged estimated or approx against STIHL spec sheets.
Something here wrong or missing for the 064/066 · MS 660 · MS 650/640? Report a correction →