Stihl model · engine series 1148

MS 172 31.8 cc

Chain: 3/8″ Picco · .043–.050″
Recommended bar: 12–18″
Mount: 3005 / A074

MS 172 chain size: 3/8″ Picco · .043–.050″, 3005-mount bar. Typical STIHL drive-link counts for 3/8" Picco (low-profile) chain: 12″ = 44, 14″ = 50, 16″ = 55, 18″ = 61. Count the links on your old chain or read the bar stamp before ordering.

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

Parts diagrams (8)

Browse saved diagrams & other models ↗

192 parts entries · catalogue coverage: MS 172 C-E. Check the sheet’s variant and serial notes.

Model & family fitment specs

Actual displacement31.8 cc

Guide bar12–18″

Chain3/8″ Picco · .043–.050″

Bar mount3005 / A074

Displacement is specific to the MS 172 roster record. Chain, bar and mount are the published family fitment for engine series 1148; confirm the pitch, gauge and drive-link count stamped on your installed bar before ordering.

displacement · verifiedbar real-world · estimatedbar mount · sourcedchain · sourceddates · verifiedvariants · verified

Chain, bar and mount: family research from STIHL product pages and parts catalogues, dealer fiche and collector records. Checked Jul 2026. How we check fitment

Chains & bars that fit the MS 172

Pitch & gauge 3/8″ Picco · .043–.050″ · recommended bar 12–18″ · bar mount 3005 / A074 · round file 5/32" (4.0 mm)

Replacement chain by bar length ↓ Guide bar · 3005 →

Chain & bar by length

Bar	Drive links	Shop
12″	44 DL	Chain .043″ · Oregon 90PX044G →Chain .050″ · Oregon 91PX044G → Bar · 3005 →
14″	50 DL	Chain .043″ · Oregon 90PX050G →Chain .050″ · Oregon 91PX050G → Bar · 3005 →
16″	55 DL	Chain .043″ · Oregon 90PX055G →Chain .050″ · Oregon 91PX055G → Bar · 3005 →
18″	61 DL	Chain .043″ →Chain .050″ · Oregon 91PX061G → Bar · 3005 →

Drive-link counts come from STIHL's saw-chain selection chart and depend on the bar mount as well as length. Pick the chain link that matches the gauge stamped on your bar. Bar searches include mount 3005 / A074; still confirm the mount stamp, pitch, gauge and drive-link count on your installed bar before ordering.

Drive-link counts: STIHL 2025 US catalog, saw chain selection, pp. 166-167; Oregon chain fit guide, STIHL section. Checked Nov 2026. How we check fitment

Named Oregon loops: Oregon product pages (chain type, pitch, gauge, drive links). Checked Nov 2026. How we check fitment

Files, oil & sharpening

Round file 5/32" (4.0 mm) → Bar & chain oil → 2-in-1 sharpener →

Suggested match: Oregon 90PX (.043″) / 91PX (.050″). Match the gauge and confirm the drive-link count for your exact bar 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	3,000 rpm
Max speed	13,000 rpm
Confidence	sourced

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 172

Production2022→

MarketGlobal

RarityCurrent

Engine family1148

Family era2022→now

31.8 cc; replaces MS 171 (C-E variant available)

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 162 · 172 · 182 · 212 family research.