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Trimmer

Stihl FS 40

2-Stroke · Also known as: FS 40 C

The Stihl FS 40 is a 27.2cc <!-- verify: stihlusa.com --> 2-stroke curved-shaft trimmer positioned just above the FS 38 in Stihl's consumer range, with a slightly refined handlebar configuration. Suited for residential grass trimming and lawn edging. The FS 40 runs a Zama carburetor; fuel system maintenance — primer bulb, fuel filter, and fuel lines — accounts for the majority of service calls. It uses a bump-feed .080" trimmer head. The FS 38, FS 40, and FS 45 share engine and filter components, ensuring strong parts availability across the entire entry range.

Stihl FS 40 quick specs

Equipment
Trimmer · 2-Stroke
Covered Parts
Spark Plug, Air Filter, Fuel Filter, Carburetor, Primer Bulb, Fuel Line Kit, Trimmer Head, Trimmer Line
OEM References
7
Model Family
FS 38, FS 40, FS 45, FS 55
See also: FS 38, FS 45, FS 55 — parts are often interchangeable within this family.

Spark Plug

OEM0000 400 7000(0.7mm gap)

Air Filter

OEM4144 124 2800Also fits FS 50, FS 70, KM 56
BrandPart #

Fuel Filter

OEM0000 350 35023/16" ID in-tank filter
BrandPart #

Carburetor

OEM4144 120 0608Zama C1M-S267D; also fits FS 50, FS 56

Primer Bulb

OEM4226 121 2700

Fuel Line Kit

OEM4144 358 0800Includes fuel pickup line and return line; also fits FS 50, FS 56, FS 70

Trimmer Head

OEM4006 710 2126AutoCut C 6-2; bump-feed; .080" line
BrandPart #
Oregon55-265Buy on Amazon →

Trimmer Line

OEM(.080" diameter, round)