Stihl model · engine series 1133

MS 270 50 cc

Chain: .325″ / 3/8″
Recommended bar: 16–20″
Mount: 3003 / D025

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

Parts diagrams (18)

Browse saved diagrams & other models ↗

392 parts entries · catalogue coverage: MS 270, MS 270 C, MS 280, MS 280 C. Check the sheet’s variant and serial notes.

Model & family fitment specs

Actual displacement50 cc

Guide bar16–20″

Chain.325″ / 3/8″

Bar mount3003 / D025

Displacement is specific to the MS 270 roster record. Chain, bar and mount are the published family fitment for engine series 1133; confirm the pitch, gauge and drive-link count stamped on your installed bar before ordering.

displacement · sourcedbar real-world · estimatedbar mount · sourcedchain · sourceddates · sourcedvariants · sourced

Chains & bars that fit the MS 270

Pitch & gauge .325″ / 3/8″ · recommended bar 16–20″ · bar mount 3003 / D025 · round file 3/16" (4.8 mm)

Replacement chain → Guide bar · 3003 →

Chain & bar by length

Bar	Drive links	Shop
16″	67 DL	Chain → Bar · 3003 →
18″	74 DL	Chain → Bar · 3003 →
20″	81 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

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.

Some links earn us a commission. It never changes the specs or what we recommend.

Service & tuning

Factory tuning settings

Idle speed	2,800 rpm
Max speed	13,500 rpm
L screw (low speed)	1/4 turn
H screw (high speed)	3/4 turn
Confidence	sourced

Screw figures are turns open from lightly seated. 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 MS 270

Production2002–10

MarketEU/Global

RarityCommon (EU)

Engine family1133

Family era2002–2010

50.0 cc

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 MS 270 · MS 280 family research.