Stihl engine series 1121 · PRO
024 · 026 · MS 260 · MS 240
Chains & bars that fit the 024 · 026 · MS 260 · MS 240
Pitch & gauge .325″ · .050–.063″ (3/8″ option) · recommended bar 16–18″ · bar mount 3003 / D025 · round file 3/16" (4.8 mm)
Chain & bar by length
| Bar | Drive links | Shop |
|---|---|---|
| 16″ | 67 DL | Chain → Bar · 3003 → |
| 18″ | 74 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 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 |
| L screw (low speed) | 1 turn |
| H screw (high speed) | 3/4 turn |
| LA screw (idle stop) | 1/4 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 (9)
1,436 part numbers across 50 exploded views — the Diagrams column goes straight to them.
| Model | Years | Market | Rarity | Diagrams | Notes |
|---|---|---|---|---|---|
| 024 AV 41.6 cc | 1982–83 | Global | Uncommon | 16 | Base, no QuickStop |
| 024 AVEQ / AVES 41.6 cc | 1982–89 | Global | Common | 16 | QuickStop / Super |
| 024 AVEQ-WB 41.6 cc | 1985–94 | US | Uncommon | 16 | Wood Boss |
| 026 / 026 Pro 48.7 cc | 1988–02 | Global | Very Common | 17 | High collector demand |
| 026 WB 48.7 cc | 1988–02 | US | Uncommon | 17 | Wood Boss |
| 026 QS 48.7 cc | 1988–02 | EU | Uncommon | 17 | EU QuickStop designation |
| MS 260 / 260 P 50.2 cc | 2002–11 | Global | Very Common | 17 | MS-era 026 |
| MS 260 C-B / C-BQ 50.2 cc | 2002–11 | EU | Uncommon | 17 | ErgoStart variants |
| MS 240 41.6 cc | 2001–09 | EU/AU | Uncommon | — | EU/AU only; never US |
Service bulletins (19)
Running changes and fixes STIHL published for this engine family.
- TI 12/2007 Shroud, Spacer Plate (Cooling Plate), Hand Guard; Summary
- TI 64/2005 Clutch, clutch shoes; Summary
- TI 21/2005 Limiter cap; Segment; Spare parts; Removal of the limiter caps; Summary
- TI 40/2004 Oil pump, worm (optimized gearing)
- TI 7/2004 Augmentation de la cylindrée sur MS 260 (cylindre avec piston, dissipateur de chaleur, fixation du; silencieux); Carburateur MS 260 (douille, couvercle de carter de carburateur)
- TI 43/2001 New Sales Designations for 024, 026; Design Change
- TI 13/2001 Tank Housing; Air Filter System with Compensator o
- TI 31/2000 Clutch (cover washer); Tank housing (tank vent); p
- TI 12/1999 024; 026: 026 annular buffers; Oil pump; Fuel pick
- TI 41/1998 ElastoStart Midi
- TI 39/1998 026 C: New 026 C Version with Quick Chain Tensione
- TI 21/1998 General: Machine Numbering
- TI 39/1997 026: Carburetor with fixed jet instead of high spe
- TI 18/1997 Tank housing /tank vent; Carburetor; Electric hand
- TI 38/1996 Fleece replaces flocked wire cloth filter
- TI 12/1996 Tank housing; air filter system with compensator;
- TI 31/1995 Air filter system with compensator; decompression
- TI 6/1995 Tank vent; tank housing; muffler
- TI 12/1994 Chain sprocket cover/side plate
Data confidence
Verify anything tagged estimated or approx against STIHL spec sheets.
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