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Trimmer

Stihl FS 100 R

4-Mix · Also known as: FS 100

The Stihl FS 100 R is a 36.3cc <!-- verify: stihlusa.com --> 4-Mix straight-shaft trimmer and a step above the FS 90 in Stihl's professional lineup. The 4-Mix engine runs standard 50:1 premix on a 4-stroke valve train for reduced noise, improved torque, and lower emissions. It runs a Walbro carburetor <!-- verify: stihlusa.com --> and is capable of driving rigid brush blades for heavy vegetation management. Valve clearance inspection every 50 hours is an additional maintenance task unique to 4-Mix models. Gearhead grease repacking and fuel system service are performed seasonally under commercial use.

See also: FS 90 R, FS 100, FS 110, FS 111 R, FS 130 R, FS 131 R — parts are often interchangeable within this family.

Spark Plug

OEM0000 400 7009(0.7mm gap)10mm thread (CMR5H) — do not substitute BPMR7A (14mm thread)

Air Filter

OEM4180 120 1800Also fits FS 87, FS 90, FS 110, FS 130
BrandPart #

Fuel Filter

OEM0000 350 3502In-tank pickup filter
BrandPart #

Carburetor

OEM4180 120 0607Zama C1Q-S183; 4-Mix diaphragm carb

Recoil Starter

OEM4180 080 2102Fits FS 90 R, FS 100, FS 110, FS 130 R
BrandPart #
Stens150-570Buy on Amazon →

Ignition Coil

OEM4180 400 1300Fits FS 90 R, FS 100, FS 110, FS 130 R
BrandPart #

Primer Bulb

OEM4226 121 2700

Fuel Line Kit

OEM4180 350 1402Includes fuel pickup line and return line; replaces 4180 358 7700

Trimmer Head

OEM4002 710 2193AutoCut C 26-2; bump-feed
BrandPart #
Oregon55-266Buy on Amazon →

Trimmer Line

OEM(.095" diameter, round)