Stihl FS KM Manual

The Stihl FS KM is a professional-grade KombiSystem powerhead designed for versatility, featuring a powerful 2-stroke engine, modular attachment system, anti-vibration technology, ErgoStart system, and compatibility with multiple Stihl KombiTool attachments. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 2-stroke engine powerhead, modular attachment interface, anti-vibration system, ErgoStart, throttle trigger lockout, stop switch, fuel tank, and attachment locking mechanism.

Feature	Description
Powerhead Engine	2-stroke engine with electronic ignition
KombiSystem Interface	Quick-connect system for various attachments
Anti-Vibration System	Reduces operator fatigue during extended use
ErgoStart System	Reduces pulling force required for starting
Throttle Trigger Lockout	Prevents accidental throttle engagement
Stop Switch	Immediately stops engine
Fuel Tank	Integrated tank for fuel/oil mixture
Attachment Lock	Secures KombiTools in place during operation
Spark Arrestor Muffler	Reduces fire risk in dry conditions
Carrying Harness Attachment	Points for optional harness system

Assembly & Installation

Unpack and inspect all components. Ensure you have the correct KombiTool attachment for your task.

1. Attach handle: Align handle with mounting points and secure with provided bolts.
2. Install harness attachment: If using carrying harness, attach to designated points.
3. Connect KombiTool: Align attachment shaft with powerhead interface and lock into place.
4. Fuel mixture: Prepare correct 2-stroke fuel/oil mixture (50:1 ratio recommended).
5. Fill fuel tank: Use clean fuel container to fill tank with approved mixture.

WARNING! Always wear appropriate PPE: safety glasses, hearing protection, gloves, and sturdy footwear. Ensure all fasteners are tightened securely.

First-Time Operation

Before starting, complete pre-operation checks and familiarize yourself with controls.

1. Pre-operation check: Verify all fasteners are tight, attachment is secure, and area is clear.
2. Starting procedure: Set stop switch to "I", press fuel primer bulb, set choke, pull starter cord.
3. Warm-up: Allow engine to run at idle for 30-60 seconds before applying load.
4. Attachment operation: Engage throttle gradually; maintain firm grip with both hands.
5. Shutdown: Release throttle, allow engine to idle briefly, move stop switch to "0".

CAUTION! Never operate without proper training. Keep bystanders at least 15 meters away during operation.

Specifications

• Engine Type: 2-stroke, single cylinder
• Displacement: Varies by model (typically 25-40cc range)
• Power Output: Professional-grade powerhead
• Fuel System: Diaphragm carburetor with primer bulb
• Ignition System: Electronic, non-adjustable
• Starting System: ErgoStart with recoil starter
• Anti-Vibration: Multi-point dampening system
• Weight (Powerhead): Approximately 5-7 kg
• Fuel/Oil Ratio: 50:1 (Stihl HP Ultra oil recommended)
• Sound Power Level: Typically 100-110 dB(A)

Controls and Functions

Main controls located on handle assembly and powerhead.

Handle Controls: Throttle trigger, throttle lockout, stop switch, handle grip.

Powerhead Controls: Choke lever, primer bulb, starter grip, fuel tank cap, attachment release.

Operation Modes: Idle position, half throttle, full throttle. Safety Features: Throttle trigger lockout prevents accidental engagement. Stop switch immediately cuts ignition. Anti-vibration system reduces transmitted vibrations. Spark arrestor muffler prevents emission of burning particles.

Attaching KombiTools

Compatible with various Stihl KombiTool attachments: brushcutters, hedge trimmers, pole pruners, cultivators, etc.

1. Ensure powerhead is off and cool to touch.
2. Align attachment shaft with powerhead interface.
3. Push firmly until locking mechanism engages (audible click).
4. Tug gently to confirm secure attachment.
5. To remove: Press release button while pulling attachment away.

Tip: Always clean attachment interface before connecting to prevent debris interference.

Operating Procedures

Proper technique ensures safety and optimal performance.

1. Starting: Engage throttle lockout, set choke, press primer 5-10 times, pull starter cord firmly.
2. Warm operation: Allow 30-60 seconds at idle before applying load to attachment.
3. Brushcutting: Use sweeping motions from right to left, keeping cutting head parallel to ground.
4. Hedge trimming: Use smooth, controlled movements; avoid forcing through thick branches.
5. Pole pruning: Secure footing before extending; cut branches in stages if large.
6. Shutdown: Release throttle, allow 30-second cool down, engage stop switch.

WARNING! Never operate above shoulder height. Always maintain secure footing and balance.

Safety Features

Multiple integrated safety systems: Throttle trigger lockout requires deliberate action to engage. Stop switch provides immediate shutdown. Anti-vibration reduces fatigue-related accidents. Spark arrestor muffler minimizes fire risk. Protective shields on attachments guard against debris.

Maintenance & Storage

Regular maintenance ensures longevity and safe operation.

Daily: Clean exterior, check fasteners, inspect cutting attachment.

Weekly: Clean air filter, check spark plug, inspect fuel lines.

Monthly: Clean cooling fins, check anti-vibration elements, lubricate attachment interface.

Storage: Drain fuel or add stabilizer, clean thoroughly, store in dry location.

CAUTION! Always disconnect spark plug before performing maintenance. Use only genuine Stihl parts.

Regulatory Information

Complies with ANSI B175.1 and EPA Phase 2 emissions standards. Contains components that may be subject to recycling regulations. Copyright © by Stihl Incorporated. All trademarks owned by or licensed to Stihl. For technical support, visit www.stihlusa.com or contact 1-800-467-8445.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Fuel issues, spark plug, flooded engine	Check fuel mixture, clean/replace spark plug, remove spark plug and pull starter to clear flooding.
Engine runs poorly	Dirty air filter, carburetor issues	Clean/replace air filter, check fuel lines, have carburetor serviced by dealer.
Excessive vibration	Loose fasteners, damaged attachment	Tighten all fasteners, inspect attachment for damage or imbalance.
Attachment won't engage	Drive shaft issues, clutch problems	Check attachment connection, inspect drive shaft, have clutch checked by dealer.
Overheating	Dirty cooling fins, lean fuel mixture	Clean cooling fins, check fuel mixture ratio, ensure proper lubrication.

Service Intervals: Refer to maintenance schedule for regular servicing requirements.

Authorized Service: 1-800-467-8445; www.stihlusa.com