Stihl FS94R Parts Manual

The Stihl FS94R is a professional-grade, lightweight trimmer designed for demanding use. This parts manual provides detailed diagrams, part numbers, and ordering information for the FS94R brushcutter/trimmer, including the engine assembly, cutting head, drive shaft, handle assembly, and all related components. Below are key sections for identification, engine parts, cutting attachments, fuel system, ignition system, and ordering.

Product Identification & Safety

Locate the model number (FS 94 R) and serial number on the engine housing. Always disconnect the spark plug before performing any maintenance or parts replacement.

Engine Assembly Parts

Cylinder, piston, crankshaft, and associated components.

1. Cylinder: Includes cylinder, cylinder head, and mounting bolts.
2. Piston Assembly: Piston, piston rings, wrist pin, and circlips.
3. Crankshaft: Main crankshaft with bearings and seals.
4. Crankcase: Upper and lower halves with gaskets.

WARNING! Use only genuine Stihl parts for engine assembly. Improper parts can cause engine failure or safety hazards.

Cutting Attachment & Drive Shaft

Parts for the trimmer head, blades, drive shaft, and gearbox.

1. Cutting Head: AutoCut C 5-2 head assembly, spool, and bump knob.
2. Blades: Circular grass blade and metal brush knife options.
3. Drive Shaft: Flexible drive shaft with upper and lower couplings.
4. Gearbox: Bevel gear housing, gears, and seals.

CAUTION! Ensure the unit is off and the cutting attachment has stopped completely before handling.

Handle & Control Assembly

• Handlebar: Loop handle with vibration damping elements.
• Throttle Trigger: Throttle lever, throttle cable, and lockout.
• Master Control Lever: Combined stop switch and choke control.
• Harness Attachment: D-rings and mounting points for harness.
• Support Strap: Adjustable shoulder strap with quick connectors.

Fuel System Components

Fuel tank, carburetor, fuel lines, and filters.

Fuel Tank: Polyethylene tank with cap and vent. Carburetor: Zama C1Q-S series carburetor with adjustment screws. Fuel Filter: In-tank filter and fuel line. Impulse Line: Connects crankcase to carburetor fuel pump.

Ignition & Electrical System

Spark plug, ignition module, stop switch, and wiring.

1. Disconnect spark plug boot before servicing.
2. Spark Plug: Bosch WSR 6 F or equivalent, gap 0.5 mm.
3. Ignition Module: Electronic ignition coil with mounting screws.
4. Wiring Harness: Connects stop switch to ignition module.

Tip: Check spark plug condition and gap regularly.

Air Filter & Cooling System

Air filter assembly, pre-cleaner, and cooling fins.

1. Remove cover: Unclip air filter cover to access filter.
2. Filter Element: Replaceable foam air filter.
3. Pre-Cleaner: Optional fleece pre-filter for dusty conditions.
4. Cooling Fins: Keep fins on cylinder head clean of debris.
5. Fan Wheel: Plastic fan on crankshaft for air circulation.

WARNING! Never operate the engine without the air filter installed.

Muffler & Exhaust Parts

Muffler, spark arrestor screen, and gaskets.

Muffler: Standard muffler with heat shield. Spark Arrestor: Removable screen (check local regulations). Gasket: Exhaust gasket between cylinder and muffler.

Fasteners & Miscellaneous Parts

Screws, nuts, washers, anti-vibration elements, and decals.

CAUTION! Use correct torque specifications for all fasteners. Overtightening can damage components.

Exploded Diagrams

Refer to numbered diagrams for part location and assembly relationships. Diagrams are organized by major assembly groups (Engine, Cutting Attachment, Handle, etc.). Match part numbers from diagrams to the parts list.

Parts Ordering & Support

Support: For technical assistance, contact your local authorized Stihl service dealer.

Manual Updates: Always check for the latest version of this parts manual online.