Stihl model · engine series 1123

021 35.2 cc

Chain: .325″ · .063″ (US) / 3/8″ Picco (EU)
Recommended bar: 16–18″
Mount: 3005 / A074

Model displacement · family chain/bar fitment. Details & confidence ↓

Parts diagrams (19)

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491 parts entries · catalogue coverage: 021, 023, 025. Check the sheet’s variant and serial notes.

Model & family fitment specs

Actual displacement35.2 cc

Guide bar16–18″

Chain.325″ · .063″ (US) / 3/8″ Picco (EU)

Bar mount3005 / A074

Displacement is specific to the 021 roster record. Chain, bar and mount are the published family fitment for engine series 1123; confirm the pitch, gauge and drive-link count stamped on your installed bar before ordering.

displacement · verifiedbar real-world · estimatedbar mount · sourcedchain · sourceddates · verifiedvariants · sourcedservice specs · sourced

Chains & bars that fit the 021

Pitch & gauge .325″ · .063″ (US) / 3/8″ Picco (EU) · recommended bar 16–18″ · bar mount 3005 / A074 · round file 3/16" (4.8 mm)

Replacement chain → Guide bar · 3005 →

Chain & bar by length

Bar	Drive links	Shop
16″	67 DL	Chain → Bar · 3005 →
18″	74 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

Round file 3/16" (4.8 mm) → Bar & chain oil → 2-in-1 sharpener →

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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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 3500
Air filter	1123 120 1613
Starter rope	3 mm · 31.5–36″
Guide coverage	021 · 023 · 025 · MS 210 · MS 230 · MS 250
Source	2019 STIHL Technical Reference Guide · sourced

The 2019 guide lists MS 250 as current; confirm local production status for newer markets.

Factory tuning settings

Idle speed	2,800 rpm
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.

About the 021

Production1990–02

MarketGlobal

RarityCommon

Engine family1123

Family era1990→now

→ MS 210

Production, market and rarity are specific to this model’s roster record.

Shared engine-family membership does not establish parts interchangeability.

Data confidence

Chain, bar, mount and displacement confidence comes from the shared 021/023/025 · MS 210/230/250 family research.