Stihl BG55 Blower Manual

The Stihl BG55 is a professional-grade handheld backpack blower designed for demanding landscaping and cleanup tasks. It features a powerful 2-stroke engine, ergonomic design with adjustable harness, variable speed throttle, cruise control, and low-vibration system. Below are key sections for safety, features, operation, maintenance, troubleshooting, and specifications.

Features at a Glance

Key components: 2-stroke engine, adjustable backpack harness, throttle trigger, cruise control lever, air filter, spark plug, fuel tank, and blower tube.

Safety Instructions

Read all instructions before operation. Wear appropriate PPE.

1. Personal Protective Equipment: Wear safety glasses, hearing protection, gloves, long pants, and sturdy shoes.
2. Operating Area: Keep bystanders and pets at least 50 feet away. Operate only in well-ventilated areas.
3. Fuel Safety: Refuel in a well-ventilated area with engine off and cool. Use only STIHL MotoMix or 50:1 gasoline/oil mix.
4. Hot Surfaces: Avoid contact with muffler and cylinder during/after operation.

WARNING! Risk of fire, explosion, and burn injury. Do not operate near flammable materials. Never modify the blower.

Assembly & Setup

Unpack and inspect contents. Assemble according to diagrams.

1. Attach blower tube: Align tube with outlet, twist clockwise until it clicks.
2. Adjust harness: Loosen straps, put on backpack, tighten for snug fit without restricting movement.
3. Fuel mix: Use STIHL MotoMix pre-mixed fuel or mix 50:1 with STIHL 2-stroke oil and 89 octane gasoline.
4. Starting procedure: Set master control lever to START, press primer bulb 5 times, pull starter cord until engine fires.

CAUTION! Ensure all fasteners are tight before operation. Do not force components during assembly.

Specifications

• Engine: STIHL 2-stroke, 27.2 cc.
• Power Output: 1.3 kW (1.7 hp).
• Fuel/Oil Ratio: 50:1 (STIHL 2-stroke oil).
• Ignition System: Electronic, capacitor discharge.
• Carburetor: Diaphragm-type with adjustable high-speed jet.
• Air Filter: Polyurethane foam, washable.
• Spark Plug: NGK BPMR7A, gap 0.020 in. (0.5 mm).
• Warranty: Limited 2-year commercial, 1-year rental.
• Compliance: EPA Phase II, CARB Tier III.

Controls and Operation

Master Control Lever: STOP, START, RUN. Throttle trigger with cruise control lock. Choke lever for cold starts.

Starting: Set lever to START, prime, pull starter. Move to RUN after engine fires. Stopping: Move lever to STOP. Operation: Use throttle for variable speed; engage cruise control for extended use. Adjustments: Harness straps, tube length, throttle cable tension.

Fuel & Lubrication

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

1. Mix fuel in approved container: Add oil first, then gasoline. Shake well.
2. Refuel with engine off: Clean area around fuel cap, fill to 80% capacity.
3. Lubrication: Gearbox requires STIHL grease every 100 hours or annually.

Tip: Use STIHL MotoMix for optimum performance and reduced maintenance.

Maintenance Schedule

Daily: Check for loose fasteners, clean air filter, inspect spark plug. Weekly: Clean cooling fins, check fuel lines. Monthly: Clean spark arrestor screen, check carburetor settings.

1. Air Filter: Remove, wash in soapy water, dry, re-oil with STIHL filter oil.
2. Spark Plug: Clean electrode, adjust gap to 0.020 in., replace if worn.
3. Fuel Filter: Replace every 50 hours or if clogged.
4. Carburetor Adjustment: Use tachometer to set high-speed jet to 12,800 RPM.

WARNING! Perform maintenance only when engine is cool. Use genuine STIHL parts.

Storage Guidelines

For storage over 30 days: Drain fuel tank and run engine dry. Remove spark plug, add 1 tsp oil, pull starter slowly. Store in dry, covered area.

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

Troubleshooting

Reset: None required. For persistent issues, consult authorized STIHL dealer.

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