Stihl BG85 Manual

The Stihl BG85 is a professional-grade handheld gasoline-powered blower designed for demanding landscaping and cleanup tasks. It features a powerful 2-stroke engine, variable throttle control, ergonomic design with anti-vibration system, adjustable tube length, and a robust air filtration system. Below are key sections for safety, features, operation, maintenance, troubleshooting, and specifications.

Features at a Glance

Key components: 2-stroke engine, throttle trigger, choke lever, stop switch, fuel tank, air filter housing, blower tube, and muffler.

Feature	Description
Engine Type	Single cylinder, 2-stroke, air-cooled
Displacement	27.2 cc
Power Output	0.9 kW (1.2 bhp)
Fuel Tank Capacity	0.5 liters
Airflow Speed	Up to 83 m/s
Sound Pressure Level	Approx. 105 dB(A)
Weight (without fuel)	4.2 kg
Anti-Vibration System	Yes, integrated dampeners
Throttle Lock	For continuous operation
Air Filter	Heavy-duty, washable foam

Safety Instructions

Read all instructions before operation. Wear appropriate PPE.

1. Always wear eye protection, hearing protection, and sturdy gloves.
2. Operate in well-ventilated areas only; exhaust contains carbon monoxide.
3. Keep bystanders, children, and pets at least 15 meters away.
4. Never point the blower tube at people, animals, or windows.
5. Inspect unit for damage before each use.

WARNING! Gasoline is highly flammable. Refuel only when engine is cool, outdoors, and away from ignition sources.

Assembly & First Use

Unpack and assemble components. Prepare fuel mixture.

1. Attach blower tube: Align arrows and twist until secure.
2. Fuel mixture: Use STIHL 2-stroke engine oil mixed with unleaded gasoline at 50:1 ratio.
3. Fill fuel tank: Use clean funnel; avoid spills.
4. Starting procedure: Set choke lever to cold start position, press primer bulb 5 times, pull starter cord briskly.
5. Warm-up: Allow engine to idle for 30 seconds before applying throttle.

CAUTION! Do not run engine indoors or in enclosed spaces.

Specifications

• Model: BG85
• Engine: 27.2 cc 2-stroke
• Maximum Air Speed: 83 m/s
• Maximum Air Volume: 650 m³/h
• Fuel Consumption: Approx. 0.6 liters/hour at full throttle
• Vibration Levels (front/rear): 4.5/2.5 m/s²
• Sound Power Level: 112 dB(A)
• Warranty: 2 years commercial use, 1 year professional use
• Compliance: Meets EPA Phase II and EU Stage II emissions standards

Controls and Operation

Main controls located on handle assembly. Throttle trigger for variable speed, throttle lock for continuous operation.

Controls: Stop switch (I/O), choke lever (run/cold start), primer bulb, throttle trigger, throttle lock button.

Operation: Start with choke on cold start. After engine fires, move choke to run position. Use throttle trigger to control airflow speed. Engage throttle lock for extended use. To stop, release throttle and press stop switch to "O".

Fuel & Lubrication

Use only fresh unleaded gasoline with minimum 89 octane. Mix with STIHL 2-stroke oil at 50:1 ratio.

1. Always shake fuel container before refueling.
2. Clean area around fuel cap before opening.
3. Do not mix oil and gasoline directly in fuel tank.
4. Use fuel stabilizer if storing for more than 30 days.

Tip: Use STIHL HP Ultra oil for reduced carbon deposits and longer engine life.

Maintenance Procedures

Regular maintenance ensures optimal performance and longevity.

1. Daily: Clean air filter, check for loose fasteners, inspect blower tube for cracks.
2. Weekly: Clean cooling fins, check spark plug condition, inspect fuel lines.
3. Monthly: Clean exhaust screen, check anti-vibration elements, lubricate throttle linkage.
4. Annually: Replace spark plug, clean carburetor, check cylinder compression.

WARNING! Always disconnect spark plug wire before performing maintenance.

Storage Guidelines

Proper storage prevents fuel system issues and corrosion.

1. Drain fuel tank completely or add fuel stabilizer.
2. Run engine until it stops to clear carburetor of fuel.
3. Clean entire unit, especially cooling fins and air filter.
4. Store in dry, cool place away from direct sunlight.
5. Cover unit with breathable cloth to prevent dust accumulation.

CAUTION! Never store unit with fuel in tank for more than 30 days without stabilizer.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Old fuel, clogged filter, no spark	Use fresh fuel mix, clean air filter, check spark plug gap (0.5 mm).
Engine runs poorly	Dirty carburetor, water in fuel	Clean carburetor jets, drain and replace fuel.
Excessive vibration	Loose components, worn mounts	Tighten all fasteners, replace anti-vibration elements.
Loss of power	Clogged exhaust, dirty air filter	Clean exhaust screen, wash air filter in warm soapy water.
Fuel leakage	Cracked fuel line, loose connections	Replace fuel lines, tighten all fuel system connections.

Reset: For electronic ignition issues, disconnect spark plug wire for 5 minutes to reset module.

Service: Authorized STIHL dealers only. Find dealer at www.stihlusa.com or call 1-800-467-8445.

Warranty & Support

STIHL Limited Warranty: 2 years for commercial use, 1 year for professional use from date of purchase. Warranty covers defects in materials and workmanship. Does not cover normal wear, misuse, or improper maintenance. For warranty service, contact authorized STIHL dealer with proof of purchase. Technical support available at www.stihlusa.com or 1-800-467-8445. Always use genuine STIHL parts for repairs.