The STIHL BG55 is a professional-grade handheld leaf blower designed for demanding residential and commercial applications. This parts manual provides detailed exploded views, part numbers, and ordering information for the BG55 blower, including the engine assembly, fuel system, ignition system, air filtration, carburetion, starter assembly, fan housing, exhaust system, controls, and housing components. Below are key sections for identification, assembly groups, ordering, and maintenance.
Locate the serial number on the engine housing. Always refer to this number when ordering parts. Use only genuine STIHL replacement parts.
| Component | Description |
|---|---|
| Model Designation | STIHL BG55 Handheld Leaf Blower |
| Engine Type | 2-stroke, single-cylinder, air-cooled |
| Displacement | 27.2 cc (1.66 cu. in.) |
| Ignition System | Electronic, capacitor discharge (CDI) |
| Fuel/Oil Mix | 50:1 (STIHL HP Ultra oil recommended) |
| Serial Number Location | Stamped on engine housing near muffler |
| Safety Symbols | Refer to original operator's manual for all safety warnings |
| Personal Protective Equipment | Always wear eye and hearing protection during operation |
Crankcase, cylinder, piston, connecting rod, crankshaft, bearings, and seals.
WARNING! Engine disassembly requires special tools and expertise. Incorrect assembly can cause engine failure or personal injury.
Fuel tank, cap, lines, filter, and primer bulb.
CAUTION! Use only ethanol-resistant fuel lines. Inspect lines regularly for cracks and replace as a set.
Air filter, cover, carburetor, and intake components.
Air Filter: Felt and foam dual-stage filter element. Carburetor: Zama C1Q-S series diaphragm carburetor. Includes gaskets, diaphragms, metering lever, needle valve, and adjustment screws (LA, H, idle).
Install: Ensure all gaskets are properly seated. Adjust: Final carburetor adjustment should be performed with a tachometer.
Rewind starter, pulley, spring, rope, and handle.
Tip: Lubricate starter pulley bushing with light grease during reassembly.
Impeller, fan housing, blower tube, and nozzle.
WARNING! Do not operate with damaged impeller or housing. Can cause catastrophic failure.
Muffler, spark arrestor screen, gasket, and mounting hardware.
Muffler: Reduces noise and directs exhaust. Spark Arrestor: Mesh screen (must be cleaned regularly to prevent carbon buildup). Gasket: Seal between cylinder and muffler.
Throttle trigger, lockout lever, throttle cable, main housing, and handles.
CAUTION! Ensure throttle cable moves freely and returns to idle automatically. Replace kinked or frayed cables.
All screws, nuts, washers, clips, and retainers specific to the BG55. Most are metric. Use correct torque specifications.
Copyright © 2025 STIHL. STIHL is a registered trademark. For genuine parts, see your authorized STIHL dealer. For support, visit www.stihlusa.com or contact 1-800-467-8445.
| Symptom / Part Needed | Reference | Action |
|---|---|---|
| Engine won't start | Fuel/Carb/Ignition Groups | Check spark, fuel delivery, and carburetor diaphragms using exploded views 2, 3, 5, 6. |
| Loss of power/airflow | Fan/Exhaust Groups | Inspect impeller and muffler screen using views 7 & 9. |
| Fuel leak | Fuel System Group | Replace fuel lines, tank, or cap using view 4. |
| Excessive vibration | AV Mounts/Fan | Check anti-vibration mounts and impeller balance using views 7 & 10. |
| Starter rope broken | Starter Group | Replace rope and spring using view 7. |
Ordering: Use the 11-digit STIHL part number from the illustrated parts list. Provide serial number to dealer.
Service: 1-800-467-8445; www.stihlusa.com