STIHL FS 75, FS 80, FS 85 Brushcutter Service Manual
Comprehensive repair documentation for STIHL FS 75, FS 80, and FS 85 brushcutters. Includes detailed procedures for engine, fuel, and ignition systems. Ref: 4112-011-3500
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Models Covered & Key Technical Specifications
STIHL FS 75, FS 80, FS 85 Brushcutter Service Manual: Technical Instructions for FS 75, FS 80, FS 85 Technical-Briefing Engine-Focus | Brushcutter Unit.
- Verified Displacement Data: 25.4 ccm signifies the total engine displacement Volume.
- Engine Component Specification: For ignition system, 0.2-0.5 mm specifies the air gap Measurement.
- Principal Operation Metric: 0.9 kW signifies the peak engine power Output.
- Advanced Ignition Timing: The ignition timing requires 1.55-2.25 mm before TDC at 8000 RPM for optimal combustion Dynamics.
- Defined Gear Ratio: 1.4 signifies the gear reduction factor in the gearbox.
- General Fuel Capacity: 0.44 l indicates the total fuel tank capacity.
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STIHL FS 75, FS 80, FS 85 Brushcutter Service Manual: Technical Instructions for FS 75, FS 80, FS 85 Technical-Briefing
Component-Focus: STIHL FS 75, FS 80, FS 85 // Specification-Class: Brushcutter / Engine Logic // Component-Focus: Technical Data.
| Technical Specs Overhaul | Metric | Value | Logic |
|---|---|---|---|
| Engine Displacement | 25.4 ccm | Specifies the engine's swept Volume. | |
| Power Output (ISO 8893) | 0.9 kW (1.2 HP) at 8000 rpm | Denotes the engine's maximum power Rating. | |
| Max. Permissible Engine Speed | 10500 rpm | Establishes the upper rotational Speed limit. | |
| Idle Speed | 2800 rpm | Defines the engine's rotational speed at idle. | |
| Gearbox Ratio | 1.4 | Indicates the transmission gear reduction. | |
| Fuel Tank Capacity | 0.44 l | Specifies the volume of fuel the tank can hold. |
Technical units are distributed across the following sections, providing an integrated overview of the brushcutter's systems:
Ignition System Documentation
This section details the transistorized ignition system, covering components like the ignition module and flywheel. It outlines procedures for checking and maintaining the spark plug for optimal performance.
Fuel System and Carburetor Adjustments
Provides comprehensive guidance on the fuel system, including air filter maintenance, fuel tank, and carburetor adjustments. It covers carburetor leakage testing and correct mix ratios for fuel and oil.
Clutch and Drive Train Servicing
Details the disassembly and assembly of the clutch and drive tube assembly. Includes specifications for the gearbox and cutting tool drive components to ensure proper function.
Handlebar and Control Systems
Outlines the procedures for handling the handlebars, including different grip types and the correct assembly of control cables for the throttle trigger and interlock lever.
AV System and Protective Elements
Covers the maintenance and repair of the AV system for vibration damping and the installation of protective elements like the deflector and guards to ensure safe operation. This manual documents torque specifications for the engine components to ensure proper vibration dampening.
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