Introduction
The Stihl BG55 is a popular handheld leaf blower known for its lightweight design, reliable two‑stroke engine, and easy maneuverability. Whether you are a homeowner clearing a modest yard or a landscaping professional handling larger properties, knowing how to start a Stihl BG55 leaf blower correctly ensures quick operation and reduces wear on the engine. This guide walks you through every aspect of the starting process, from pre‑start safety checks to troubleshooting common problems, so you can get the machine running smoothly every time.
- Understanding the Stihl BG55
- Safety Precautions Before Starting
- Required Tools and Materials
- Step‑by‑Step Starting Procedure
- Troubleshooting Common Starting Issues
- Comparison Table: Stihl BG55 vs Competing Models
- Maintenance Tips for Reliable Starts
- Best Practices for Longevity
- Common Mistakes to Avoid
- Frequently Asked Questions
- Conclusion
Understanding the Stihl BG55
Key Features
The BG55 features a 27.2 cc two‑stroke engine that delivers a maximum air speed of 159 mph and an air volume of 412 cfm. Its anti‑vibration system reduces operator fatigue, while the ergonomic handle and throttle trigger provide comfortable control during extended use. The blower also includes a transparent fuel tank for easy level checks and a tool‑less air filter cover for quick maintenance.
Engine Specifications
Understanding the engine specifications helps you select the correct fuel mix and anticipate performance. The engine runs on a 50:1 gasoline‑to‑oil ratio using high‑quality two‑stroke oil. It has a displacement of 27.2 cc, a maximum power output of 0.9 kW (1.2 hp) at 9,500 rpm, and a fuel tank capacity of 0.33 L. These numbers are useful when comparing the BG55 to other blowers in its class.
Safety Precautions Before Starting
Safety should always be the first step when operating any power equipment. Wear hearing protection, safety glasses, and sturdy gloves. Ensure the work area is clear of bystanders, pets, and loose debris that could become projectiles. Verify that the blower’s throttle trigger moves freely and that the stop switch functions correctly. Never start the engine in an enclosed space because the exhaust contains carbon monoxide. Keep a fire extinguisher rated for gasoline fires nearby, especially when refueling.
Required Tools and Materials
Before you begin, gather the following items: fresh unleaded gasoline (minimum 89 octane), Stihl‑approved two‑stroke oil, a clean fuel container, a funnel, a spark plug wrench (usually 13 mm), a clean rag, and the operator’s manual for reference. Having these on hand prevents interruptions and ensures you use the correct fuel mixture, which is critical for engine health.
Step‑by‑Step Starting Procedure
Follow these steps in order each time you start the blower. The procedure assumes the engine is cold; if the engine is warm, you can skip the choke steps.
- Check fuel level and mixture. Open the transparent fuel tank and confirm there is enough fuel. If the tank is low, mix fresh gasoline and two‑stroke oil at a 50:1 ratio in a clean container, then fill the tank using a funnel. Wipe any spills immediately.
- Set the choke lever to the “full choke” position. On the BG55 the choke lever is located on the side of the engine housing. Move it fully toward the “choke” icon. This enriches the fuel‑air mixture for a cold start.
- Prime the engine. Press the primer bulb (usually a small rubber bulb near the carburetor) 5–7 times until you see fuel move through the clear fuel line. Priming fills the carburetor with fuel, reducing the number of pulls needed.
- Place the blower on a flat, stable surface. Hold the handle firmly with one hand and keep the throttle trigger in the idle position (released). Ensure the blower tube is pointed away from you and any obstacles.
- Pull the starter rope sharply. Grasp the starter handle, pull the rope out slowly until you feel resistance, then give a quick, strong pull. Repeat up to three times. The engine should fire and run briefly.
- Move the choke to the “half choke” position. Once the engine coughs or runs for a second, shift the choke lever to the middle position. This leans the mixture slightly while the engine warms.
- Pull the starter rope again. Give one or two more pulls. The engine should now start and run steadily.
- Allow the engine to warm up. Let the blower idle for 30–60 seconds. Then move the choke lever to the “run” (off) position. The engine is now ready for full throttle operation.
Troubleshooting Common Starting Issues
Flooded Engine
If the engine smells strongly of gasoline and will not start after several pulls, it may be flooded. Remove the spark plug, dry it with a clean rag, and pull the starter rope a few times with the throttle wide open to clear excess fuel. Reinstall the spark plug, set the choke to “run,” and attempt to start again.
Spark Plug Problems
A fouled or worn spark plug is a frequent cause of hard starting. Inspect the plug for carbon deposits, corrosion, or an eroded electrode. Clean with a wire brush or replace with a new NGK BPMR7A (or equivalent) plug gapped to 0.6 mm. Ensure the spark plug wire is securely attached.
Fuel Line Blockage
Old or contaminated fuel can clog the fuel line or carburetor. Drain the tank, flush the line with fresh fuel, and clean the carburetor’s inlet screen. If the problem persists, a carburetor rebuild or professional service may be required.
Comparison Table: Stihl BG55 vs Competing Models
| Model | Engine Displacement (cc) | Max Air Speed (mph) | Air Volume (cfm) | Weight (lb) | Fuel Mix Ratio |
|---|---|---|---|---|---|
| Stihl BG55 | 27.2 | 159 | 412 | 9.5 | 50:1 |
| Husqvarna 125B | 28.0 | 170 | 425 | 9.8 | 50:1 |
| Echo PB-2520 | 25.4 | 165 | 390 | 9.2 | 50:1 |
| Makita BHX2500CA | 24.5 | 145 | 380 | 9.0 | 50:1 |
The table shows that the BG55 offers a balanced combination of power, weight, and fuel efficiency, making it a strong contender for both residential and light commercial use.
Maintenance Tips for Reliable Starts
Regular maintenance dramatically improves starting reliability. Clean or replace the air filter every 25 hours of operation; a clogged filter restricts airflow and causes hard starts. Inspect the spark plug every 50 hours and replace it annually. Drain old fuel at the end of each season and run the engine dry to prevent gum formation in the carburetor. Lubricate the throttle cable and check the starter rope for fraying. Finally, tighten all bolts and screws periodically, as vibration can loosen them over time.
Best Practices for Longevity
Adopt these habits to extend the life of your BG55: always use fresh fuel mixed at the correct ratio; store the blower in a dry, ventilated area; avoid running the engine at full throttle for prolonged periods without a load; and allow the engine to cool before refueling. When transporting the blower, secure the fuel cap and keep the unit upright to prevent fuel leakage into the crankcase.
Common Mistakes to Avoid
- Using stale or improperly mixed fuel. This leads to carburetor gumming and hard starts.
- Leaving the choke on after the engine warms. This causes a rich mixture, fouling the spark plug and wasting fuel.
- Pulling the starter rope too gently. A weak pull does not generate enough compression for ignition.
- Neglecting the air filter. A dirty filter reduces airflow, making the engine run lean and overheat.
- Skipping the warm‑up period. Immediate high‑throttle operation can damage a cold engine.
Frequently Asked Questions
What fuel mixture does the Stihl BG55 require?
The BG55 requires a 50:1 gasoline‑to‑oil mixture using high‑quality two‑stroke oil. Always mix in a clean container and use fresh gasoline with a minimum octane rating of 89.
How often should I replace the spark plug?
Inspect the spark plug every 50 hours of operation and replace it at least once per season or whenever you notice hard starting, misfires, or excessive carbon buildup.
Why does my blower stall after a few seconds of running?
Stalling shortly after start often indicates a lean condition caused by a clogged fuel filter, a dirty carburetor, or an air leak in the intake system. Check the fuel line, clean the carburetor, and verify that all gaskets are intact.
Can I use ethanol‑blended gasoline in the BG55?
Stihl recommends using gasoline with no more than 10 % ethanol (E10). Higher ethanol blends can attract moisture and cause fuel system corrosion. If possible, use ethanol‑free gasoline for best results.
What should I do if the starter rope does not retract?
A starter rope that fails to retract usually means the recoil spring is broken or the rope is tangled. Remove the starter housing, inspect the spring, and replace the rope or spring as needed. Reassemble carefully to ensure proper tension.
Conclusion
Starting a Stihl BG55 leaf blower is a straightforward process when you follow the correct sequence: verify fuel, set the choke, prime, pull the starter rope, adjust the choke, and allow a brief warm‑up. Coupled with regular maintenance — clean air filter, fresh fuel, good spark plug — and safe operating habits, the BG55 will deliver reliable performance season after season. By understanding the engine’s requirements and avoiding common mistakes, you minimize downtime and extend the tool’s lifespan. Keep this guide handy, and you’ll master how to start a Stihl BG55 leaf blower with confidence every time you need to clear leaves or debris.