Stihl model · engine series 1101

BL 125 cc

Production1952–59

MarketEU

RarityRare

Engine family1101

125 cc; two-man saw convertible to one-man (also sold as BG 41)

The production, market and rarity details above are specific to the BL roster record. The displacement below is specific to this roster record. The chain, bar and mount are the published family fitment for engine series 1101; confirm the pitch, gauge and drive-link count stamped on your installed bar before ordering.

Model & family fitment specs

Actual displacement125 cc

Guide bar18–24″

Chain.404″ (≈)

Bar mountProprietary mount

Family era1952–1959

Chains & bars that fit the BL

Pitch & gauge .404″ (≈) · recommended bar 18–24″ · bar mount Proprietary / nonstandard mount · round file 7/32" (5.5 mm)

Replacement chain → Guide-bar link withheld: proprietary / nonstandard mount.

Files, oil & sharpening

Round file 7/32" (5.5 mm) → Bar & chain oil → 2-in-1 sharpener →

Suggested match: Oregon 27/59-series. 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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Data confidence

Chain, bar, mount and displacement confidence comes from the shared BL family research.

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

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