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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Document Details

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Document Number / Seller:
30207 / Emily Taylor
File Size:
6.57 MB
File Type:
PDF
Language:
English
Printable:
Yes
Category:
Brushcutter
Last updated / verified
Nov 21, 2025

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.

Professional Workshop Service Manual & Technical Specifications

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.

FAQ

What values are **calibrated** for the engine's system architecture? keyboard_arrow_down

25.4 ccm is the specified engine displacement, and the ignition timing is calibrated to 1.55-2.25 mm before TDC at 8000 RPM.

Assess the **applicable** tool requirements for ignition system maintenance. keyboard_arrow_down

For ignition system work, a spark plug with a 0.5 mm electrode gap is applicable, and the ignition module may require specific tools for removal and installation.

What components require **exact** electrical values for troubleshooting? keyboard_arrow_down

Troubleshooting the ignition system should begin with the spark plug, and the transistorized ignition system comprises the ignition module and flywheel, which are essential for electrical function.

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Reviews (3)

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The troubleshooting section saved me a lot of time. Quick download process too!
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Rated 5 out of 5 stars
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This manual covers everything I needed to know for repairs. The diagrams are incredibly helpful!