Stihl BG 55 Parts Manual

The Stihl BG 55 is a professional-grade handheld blower designed for demanding cleanup tasks. This parts manual provides detailed diagrams, part numbers, and ordering information for all components of the BG 55 blower, including the engine assembly, fan housing, carburetor, fuel system, ignition system, throttle controls, and housing parts. Below are key sections for identification, engine parts, blower assembly, controls, and ordering.

Product Identification & Specifications

Key identifiers: Model BG 55, Engine type, Serial number location.

Feature	Description
Model	BG 55 Handheld Blower
Engine Type	2-stroke, single-cylinder, air-cooled
Displacement	27.2 cc (1.66 cu. in.)
Power Output	0.8 kW (1.1 bhp)
Idle Speed	2800 rpm
Max. Air Speed	72 m/s (159 mph)
Air Volume	650 m³/h (383 cfm)
Fuel Tank Capacity	0.5 liters (16.9 fl. oz.)
Weight (dry)	4.2 kg (9.3 lbs)
Sound Pressure Level	Typically 96 dB(A)

Engine Assembly Parts

Cylinder, piston, crankshaft, connecting rod, bearings, seals.

1. Cylinder Assembly: Includes cylinder, fins, exhaust port.
2. Piston Assembly: Piston, rings, wrist pin, circlips.
3. Crankshaft Assembly: Crankshaft, main bearings, oil seals.
4. Crankcase: Upper and lower halves, gasket.

WARNING! Engine components are precision parts; handle with care to avoid damage. Use proper tools for disassembly.

Fan Housing & Impeller Assembly

Components for air intake and discharge.

1. Fan Housing: Main plastic housing directing airflow.
2. Impeller (Fan): Multi-blade plastic fan, mounted on crankshaft.
3. Air Intake Cover: Protective cover with mesh screen.
4. Discharge Tube: Connects to housing for airflow direction.
5. Mounting Bolts & Nuts: Secure housing to engine.

CAUTION! Ensure impeller is balanced and free of cracks. Do not operate with damaged fan housing.

Carburetor & Fuel System Parts

• Carburetor Assembly: Complete unit (e.g., Zama C1Q-S series).
• Fuel Tank: Plastic tank with cap and vent.
• Fuel Line: Supply line from tank to carburetor.
• Fuel Filter: In-tank filter element.
• Air Filter: Foam element with cover.
• Throttle Lever & Linkage: Controls carburetor butterfly.
• Primer Bulb: For fuel system priming.

Ignition System & Controls

Components for starting and stopping engine.

Ignition Module: Electronic ignition coil, spark plug wire.

Spark Plug: Champion RCJ-6Y or equivalent.

Stop Switch: On/Off switch assembly.

Throttle Trigger: Lever with lockout safety.

Throttle Cable: Connects trigger to carburetor.

Choke Lever: Controls carburetor choke plate.

Starter Assembly: Recoil starter, rope, pulley, spring.

Housing, Handles & Mounting Parts

Main blower body and operator interface.

1. Main Housing: Plastic clamshell enclosing engine.
2. Rear Handle: Main grip with vibration damping.
3. Front Handle: Auxiliary handle for control.
4. Harness Attachment Points: D-rings for shoulder strap.
5. Rubber Anti-Vibration Elements.
6. Decals & Labels: Warning and model identification.

Tip: Inspect housing for cracks, especially at mounting points.

Fasteners, Seals & Gaskets

Small parts critical for assembly.

1. Screws & Bolts: Various lengths and threads (M5, M6).
2. Lock Nuts & Washers: Nylon insert nuts, flat washers.
3. Crankcase Seals: Main bearing seals.
4. Cylinder Base Gasket.
5. Carburetor Mounting Gasket.
6. Exhaust Gasket & Muffler Seal.
7. Fuel Line Clamps.

WARNING! Always replace seals and gaskets during reassembly. Use correct torque specifications.

Exploded View Diagrams

Reference diagrams showing part relationships and numbers.

Parts Ordering Information

Use genuine Stihl parts. Provide model and serial number.

CAUTION! Non-genuine parts may affect performance and void warranty.

Safety & Maintenance Notes

Unplug spark plug before servicing. Use proper fuel/oil mix (50:1). Clean air filter regularly. Inspect for loose fasteners.

Troubleshooting & Service

Symptom	Possible Cause	Corrective Action
Engine won't start	Fuel, spark, compression	Check fuel mix, spark plug, carburetor settings, compression.
Loss of power	Clogged air filter, exhaust	Clean/replace air filter. Check muffler spark arrestor screen.
Excessive vibration	Damaged impeller, loose parts	Inspect impeller for damage. Tighten all housing screws.
Airflow weak	Worn impeller, clogged tube	Inspect impeller blades. Clear discharge tube of debris.
Fuel leak	Cracked tank, bad fuel line	Inspect tank and lines. Replace damaged components.

Service: Authorized Stihl servicing dealers only. Refer to official service manual for repair procedures.

Support: Contact Stihl USA at 1-800-467-8445 or visit www.stihlusa.com.