Stihl Blower BG 86 Manual

The Stihl BG 86 is a powerful, handheld gasoline-powered leaf blower designed for professional and residential use. It features a lightweight design, easy-start system, adjustable airspeed, anti-vibration handles, and a fuel-efficient engine. Below are key sections for safety, features, operation, maintenance, troubleshooting, and specifications.

1. Features at a Glance 2. Safety Instructions 3. Assembly & Preparation 4. Specifications 5. Controls and Operation 6. Fuel & Oil Mixture 7. Starting & Stopping 8. Maintenance Schedule 9. Storage Guidelines 10. Warranty Information 11. Troubleshooting

Features at a Glance

Key components: Engine, fuel tank, air filter, throttle trigger, choke lever, stop switch, blower tube, and adjustable nozzle.

Feature	Description
Engine Type	2-stroke, single-cylinder, air-cooled
Displacement	27.2 cc
Power Output	0.8 kW (1.1 hp)
Fuel Tank Capacity	0.5 liters
Air Volume	Up to 650 m³/h
Air Speed	Up to 250 km/h
Weight (dry)	Approx. 4.2 kg
Sound Pressure Level	Typically 96 dB(A)
Vibration Level	Typically 4.5 m/s²
Starter System	Easy2Start™

Safety Instructions

Read all instructions before operation. Wear appropriate PPE.

Personal Protective Equipment: Wear safety glasses, hearing protection, long pants, and sturdy shoes.
Operating Area: Keep bystanders, children, and pets at least 15 meters away.
Fuel Safety: Refuel outdoors only, with engine off and cool. Use approved fuel container.
Hot Surfaces: Avoid contact with muffler and engine; they become very hot during operation.
Carbon Monoxide: Operate only in well-ventilated areas; never indoors.

WARNING! Risk of fire, explosion, and injury. Follow all safety rules.

Assembly & Preparation

Unpack and inspect all parts. Assemble before first use.

Attach Blower Tube: Align tube with blower outlet and twist clockwise until it locks.
Attach Nozzle: Slide adjustable nozzle onto end of blower tube and secure with locking collar.
Fuel Mix: Prepare 50:1 fuel/oil mixture using STIHL 2-stroke oil and unleaded gasoline (min. 89 octane).
Fill Fuel Tank: Clean area around cap, fill with mixed fuel to indicated level.

CAUTION! Ensure all connections are secure before starting.

Specifications

Model: BG 86
Engine: STIHL 2-MIX engine technology
Displacement: 27.2 cm³
Powerhead Weight: 4.2 kg (9.3 lbs)
Sound Power Level: 112 dB(A)
Exhaust Emissions: Meets EPA Phase II and EU Stage II standards
Fuel/Oil Ratio: 50:1 (STIHL 2-stroke oil)
Warranty: Limited warranty for residential use; see manual for details.

Controls and Operation

Master Control Lever: Combines choke, throttle lock, and stop functions. Throttle Trigger: Controls engine speed. Throttle Lock: Locks throttle at idle for warm-up. Stop Switch: Moves to STOP position to shut off engine.

Operating Tips: Hold blower with both hands. Start at low speed, increase as needed. Use sweeping motions for best results. Avoid pointing nozzle at people, animals, or debris that could become projectiles.

Fuel & Oil Mixture

Use only unleaded gasoline with minimum 89 octane and STIHL 2-stroke engine oil.

Mix Ratio: 50 parts gasoline to 1 part oil (50:1).
Mixing: Add oil to approved fuel can, then add gasoline. Shake thoroughly.
Storage: Use fresh fuel; do not store mixed fuel more than 30 days.

Tip: Never use automotive oil or fuel with more than 10% ethanol.

Starting & Stopping

Follow cold or warm starting procedure.

Cold Start: Set master control lever to choke position (full left). Press decompression valve if equipped. Pull starter rope sharply until engine fires. Move lever to half-throttle position. Pull starter rope again to start. Allow to warm up at idle.
Warm Start: Set master control lever to run position (horizontal). Pull starter rope.
Stopping: Release throttle trigger. Move stop switch to STOP position.

WARNING! Keep hands and feet clear of blower tube during starting.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Component	Frequency	Action
Air Filter	Every 10 hours	Clean with soapy water; replace if damaged
Spark Plug	Every 100 hours	Clean, check gap (0.5 mm), replace if worn
Fuel Filter	Every year	Replace
Spark Arrestor Screen	Every 50 hours	Clean carbon deposits
Blower Tube/Nozzle	After each use	Inspect for cracks/damage

Storage Guidelines

Prepare blower for storage if not used for more than 30 days.

Drain fuel tank and run engine until it stops to clear carburetor.
Remove spark plug and add 1-2 teaspoons of engine oil through spark plug hole. Pull starter rope slowly to distribute oil, then reinstall plug.
Clean entire unit, especially cooling fins and air filter.
Store in dry, secure place, out of reach of children.

CAUTION! Never store with fuel in tank for extended periods.

Warranty Information

STIHL Limited Warranty: Covers defects in materials and workmanship. Residential warranty period differs from commercial. Proof of purchase required. Warranty does not cover damage from misuse, improper fuel, neglect, or normal wear. For warranty service, contact an authorized STIHL servicing dealer.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine will not start	No fuel, flooded engine, spark plug	Check fuel level; wait if flooded; check/replace spark plug.
Engine runs poorly or stalls	Dirty air filter, old fuel, clogged fuel filter	Clean/replace air filter; use fresh fuel; replace fuel filter.
Loss of power	Clogged spark arrestor, dirty cooling fins	Clean spark arrestor screen; clean cooling fins.
Excessive vibration	Loose parts, damaged blower tube	Tighten all fasteners; inspect tube for cracks.
Unusual noise	Foreign object in impeller, worn bearings	Stop engine immediately; inspect impeller area; contact dealer.

Service: For repairs, use only authorized STIHL dealers. Find dealer at www.stihlusa.com or call 1-800-467-8445.