Stihl KM110R Manual

The Stihl KM110R is a professional-grade KombiMotor powerhead designed for use with multiple STIHL attachments. This 4-stroke engine power unit features a 27.2 cc displacement, Easy2Start™ technology, anti-vibration system, ErgoStart™, and a decompression valve. It is compatible with the STIHL KombiSystem attachments including trimmer heads, brushcutters, edgers, hedge trimmers, and more. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 4-MIX 4-stroke engine, Easy2Start™ system, anti-vibration handles, ErgoStart™, decompression valve, quick-release attachment system, and STIHL Ematic™ lubrication system (for compatible attachments).

Feature	Description
Engine Type	4-MIX 4-stroke, single cylinder
Displacement	27.2 cc
Power Output	1.0 kW (1.3 hp)
Starting System	Easy2Start™ with ErgoStart™
Fuel System	Diaphragm carburetor with manual choke
Anti-Vibration	Multi-point system in handles and shaft
Attachment System	Quick-release KombiSystem
Lubrication	STIHL Ematic™ for gearheads (optional)
Weight (Powerhead)	5.4 kg (11.9 lbs)
Sound Power Level	103 dB(A)

Safety Information

Read and understand all safety instructions before operation.

1. Personal Protective Equipment (PPE): Always wear safety glasses, hearing protection, gloves, long pants, and sturdy boots.
2. Clear Work Area: Remove stones, nails, wire, and other debris before operation.
3. Fuel Safety: Refuel outdoors only, with engine stopped and cool. Use STIHL MotoMix® or 89+ octane gasoline mixed with STIHL HP Ultra oil (50:1).
4. Operation Zone: Keep bystanders and pets at least 15 meters away.
5. Hot Surfaces: Avoid contact with muffler and cylinder during/after operation.

WARNING! Improper use can cause serious injury or death. Never operate without proper training and PPE.

Assembly & First Use

Unpack and inspect contents. Assemble on a clean, flat surface.

1. Attach Handle: Slide handle onto shaft, align, and tighten clamping screws.
2. Install Attachment: Align arrow on attachment with arrow on powerhead, push together, and rotate locking collar until it clicks.
3. Add Fuel: Use STIHL MotoMix® (pre-mixed) or mix 50:1 with STIHL HP Ultra oil and 89+ octane gasoline.
4. Initial Start: Place unit on ground, set master control lever to cold start position (choke on), pull starter rope until engine fires, move lever to run position, restart.

CAUTION! Ensure all fasteners are tight before operation. Do not force attachments.

Specifications

• Engine: 4-MIX 4-stroke, air-cooled, single cylinder.
• Displacement: 27.2 cm³.
• Power Output: 1.0 kW at 7,000 rpm.
• Idle Speed: 2,800 rpm.
• Max. Engine Speed: 10,500 rpm.
• Fuel/Oil Mix: 50:1 (STIHL HP Ultra) or STIHL MotoMix®.
• Fuel Tank Capacity: 0.53 liters.
• Sound Pressure Level: 92 dB(A).
• Vibration Level (Handles): 4.5 m/s² (front), 3.5 m/s² (rear).
• Warranty: 2 years commercial, 4 years private (with registration).

Controls and Functions

Master Control Lever: Combines stop switch, choke, and run positions. Throttle Trigger: Located on rear handle. Throttle Trigger Lockout: Must be depressed to engage throttle. Easy2Start™: Reduces pulling force by 40%. Decompression Valve: Eases starting. Anti-Vibration System: Rubber mounts in handles and shaft.

Starting Procedure:

1. Press fuel pump bulb 5-10 times.
2. Set master control to cold start (choke).
3. Pull starter rope until engine fires (1-2 pulls).
4. Move master control to run position.
5. Pull starter rope to start.

Attaching Tools

Compatible with STIHL KombiSystem attachments: PolyCut head, Circular Brush Knife, Grass Blade, Hedge Trimmer, Edger, Pole Pruner, etc.

1. Ensure powerhead is off and cool.
2. Align arrows on attachment and powerhead.
3. Push together firmly.
4. Rotate locking collar clockwise until it clicks.
5. Tug attachment to ensure secure connection.

Tip: Clean attachment shaft and powerhead socket before connecting.

Operation

Operating techniques vary by attachment.

1. Trimming/Brushcutting: Use a smooth, sweeping motion from right to left. Keep cutting head parallel to ground.
2. Hedge Trimming: Use wide, arcing strokes; keep blade teeth away from body.
3. Edging: Hold unit vertically, guide along edge.
4. Throttle Control: Use intermittent full throttle for cutting; avoid prolonged idling.
5. Stopping: Release throttle, allow engine to idle 30 seconds, move master control to STOP.

WARNING! Never operate with loose or damaged attachments. Keep hands and feet away from cutting tools.

Maintenance & Storage

Daily maintenance ensures long life and safe operation.

Interval	Task
Before each use	Check fasteners, inspect for damage, clean air intake
Every 25 hours	Clean spark plug, check fuel filter
Every 50 hours	Replace spark plug, clean cooling fins
Every 100 hours	Clean combustion chamber, check carburetor

Storage: Run engine dry or add fuel stabilizer. Clean entire unit. Store in dry, locked area.

CAUTION! Always disconnect spark plug boot before maintenance.

Carburetor Adjustment

Factory preset; adjustment rarely needed. If required:

1. Start engine and warm up 5 minutes.
2. Turn idle speed screw (LA) to achieve 2,800 rpm.
3. Turn low speed screw (L) for smooth acceleration.
4. Turn high speed screw (H) for maximum 10,500 rpm.
5. Recheck idle speed.

Note: Only qualified technicians should adjust carburetor. Incorrect settings can damage engine.

Warranty Information

STIHL Limited Warranty: 2 years for commercial use, 4 years for private use (registration required within 8 weeks of purchase). Warranty covers defects in materials/workmanship. Not covered: normal wear, misuse, improper maintenance, non-STIHL parts. For warranty service, contact authorized STIHL dealer.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, flooded, spark plug	Check fuel; set choke to run; dry plug; replace spark plug.
Engine runs poorly	Dirty air filter, old fuel	Clean/replace air filter; drain and refill with fresh fuel.
Excessive vibration	Loose attachment, bent shaft	Tighten attachment; inspect shaft for damage.
Attachment won't engage	Locking collar not engaged	Realign arrows, rotate collar until click.
Loss of power	Clogged fuel filter, dirty spark arrestor	Replace fuel filter; clean spark arrestor screen.

Service: For repairs, contact authorized STIHL dealer only.

Support: 1-800-467-8445; www.stihlusa.com