How to Start Stihl Leaf Blower Bg 55? Quick & Easy Startup Instructions

Introduction

Learning how to start Stihl leaf blower Bg 55 correctly ensures reliable performance and extends the life of the machine. The BG 55 is a popular handheld blower known for its lightweight design, low‑emission engine, and easy‑start technology. Whether you are a homeowner clearing a yard or a professional landscaper preparing a job site, following the proper startup sequence prevents flooding, reduces wear on the starter rope, and keeps the engine running smoothly. This guide walks you through every stage, from pre‑start safety checks to troubleshooting common problems, so you can get the blower running quickly and safely each time you need it.

Table of Contents

• Understanding the Stihl BG 55
• Safety Precautions Before Starting
• Pre‑Start Checks
• Step‑by‑Step Starting Procedure
• Cold Start vs. Warm Start Differences
• Troubleshooting Common Starting Issues
• Comparison Table: BG 55 vs. BG 56 vs. BG 86
• Maintenance Tips for Reliable Starts
• Common Mistakes to Avoid
• Frequently Asked Questions
• Conclusion

Understanding the Stihl BG 55

Features and Design

The Stihl BG 55 is powered by a 27.2 cc two‑stroke engine that delivers 1.1 kW (1.5 hp) of blowing force. It weighs only 4.4 kg (9.7 lb) without fuel, making it comfortable for extended use. The blower incorporates Stihl’s Easy2Start system, which reduces the pulling force required on the starter rope by up to 40 %. An anti‑vibration system isolates the engine from the handle, reducing operator fatigue. The throttle trigger features a lock‑on position for continuous operation, and the cruise control lever lets you set a constant speed without holding the trigger.

Engine Specifications

Key specifications include a 0.75 L fuel tank, a 0.25 L oil tank (for the 50:1 fuel‑oil mix), and a maximum air velocity of 71 m/s (158 mph). The spark plug is a NGK BPMR7A, and the recommended fuel is fresh unleaded gasoline with a minimum octane rating of 89, mixed with Stihl 2‑stroke oil at a 50:1 ratio. The air filter is a pleated paper element that can be cleaned with compressed air or replaced when excessively dirty. Understanding these specs helps you verify that the blower is in proper condition before each start.

Safety Precautions Before Starting

Personal Protective Equipment

Always wear safety glasses or a face shield to protect your eyes from debris. Hearing protection such as ear plugs or muffs is recommended because the blower can exceed 100 dB at close range. Gloves improve grip on the starter rope and protect hands from vibration. Sturdy, closed‑toe boots with good traction reduce the risk of slipping on wet leaves or uneven ground. Long sleeves and pants guard against flying particles and minor cuts.

Work Area Preparation

Clear the immediate area of loose objects, stones, and tools that could become projectiles. Ensure there is adequate ventilation; never start the blower in an enclosed space because the engine emits carbon monoxide. Keep bystanders, especially children and pets, at least 15 m (50 ft) away. Check that the blower’s exhaust outlet points away from people, windows, and flammable materials. If you are working near a road, position yourself so the airflow does not blow debris into traffic.

Pre‑Start Checks

Fuel Level and Quality

Open the fuel cap and verify that the tank contains enough fresh fuel mixture for the intended job. Stihl recommends using fuel no older than 30 days; stale gasoline can cause hard starting and gum deposits. If the fuel looks dark or has a varnish smell, drain the tank and refill with a fresh 50:1 mix. Always use a clean, approved fuel container to avoid contamination.

Oil Level

The BG 55 uses a separate oil tank for the 2‑stroke lubrication system. Check the sight glass or dipstick (depending on model year) to confirm the oil level is between the minimum and maximum marks. Low oil leads to insufficient lubrication, overheating, and potential engine seizure. Top up with Stihl 2‑stroke oil if necessary, but do not overfill.

Air Filter Condition

Remove the air filter cover and inspect the pleated paper element. A clean filter ensures proper air‑fuel mixture and easy starting. Tap the filter gently to dislodge loose dust, or blow it out with low‑pressure compressed air from the inside out. If the filter is torn, excessively dirty, or oil‑soaked, replace it with a genuine Stihl part.

Spark Plug Inspection

Disconnect the spark plug boot, remove the plug with a 5/8‑inch spark plug socket, and examine the electrode. A light tan color indicates correct combustion. Black, sooty deposits suggest a rich mixture or a clogged air filter. White, blistered electrodes point to a lean condition or overheating. Clean the plug with a wire brush, set the gap to 0.5 mm (0.020 in), and reinstall. Replace the plug annually or after 100 hours of operation.

Step‑by‑Step Starting Procedure

1. Set the choke lever to the “Full Choke” position. On a cold engine this enriches the mixture for easier ignition.
2. Press the primer bulb 5–7 times until you see fuel fill the bulb. This draws fuel into the carburetor and reduces the number of pulls needed.
3. Engage the throttle lock. Squeeze the throttle trigger and slide the lock forward so the trigger stays partially open. This provides a slight throttle opening for starting.
4. Place the blower on a stable, flat surface. Hold the handle firmly with your left hand (or right hand if you are left‑handed) and keep the nozzle pointed away from you.
5. Pull the starter rope briskly until you feel resistance, then give a strong, smooth pull. The Easy2Start system reduces the effort, but a decisive pull is still required.
6. When the engine coughs or fires, move the choke lever to the “Half Choke” position. This leans the mixture slightly while the engine warms.
7. Pull the starter rope again until the engine runs steadily. Usually one or two more pulls are sufficient.
8. Allow the engine to warm for 15–30 seconds at half choke, then move the choke lever to the “Run” (open) position.
9. Release the throttle lock and let the engine idle. Verify that the blower produces a steady airflow before beginning work.

Following these steps each time you need to start the blower minimizes the chance of flooding and ensures a quick, reliable ignition.

Cold Start vs. Warm Start Differences

A cold start occurs when the engine has not run for several hours or overnight. The fuel in the carburetor may have evaporated, and the engine components are at ambient temperature. The full‑choke and primer routine described above is essential for a cold start. A warm start, on the other hand, happens shortly after the engine has been shut off. The carburetor still contains fuel, and the engine retains heat. For a warm start you can usually skip the primer bulb, set the choke to “Half Choke” or even “Run,” and pull the starter rope once or twice. Attempting a full‑choke warm start often floods the engine, leading to a no‑start condition that requires a waiting period before another attempt.

Troubleshooting Common Starting Issues

Flooded Engine

If you pull the starter rope many times with the choke fully closed and the engine does not fire, the combustion chamber may be flooded with excess fuel. To clear a flood, set the choke to “Run,” open the throttle fully, and pull the starter rope 5–10 times without the choke engaged. This draws fresh air through the cylinder and evaporates the surplus fuel. After clearing, return to the normal starting sequence with half choke.

No Spark

A missing spark can be caused by a fouled spark plug, a defective ignition coil, or a disconnected kill switch wire. First, verify the spark plug is clean and correctly gapped. Reconnect the spark plug boot firmly. If the problem persists, test the ignition coil with a spark tester or consult a Stihl dealer for coil replacement.

Fuel Delivery Problems

Stale fuel, a clogged fuel filter, or a blocked fuel line can starve the engine. Drain old fuel, replace the fuel filter (located inside the tank), and blow out the fuel line with compressed air. Ensure the fuel cap vent is not obstructed, as a vacuum in the tank prevents fuel flow.

Comparison Table: BG 55 vs. BG 56 vs. BG 86

The table highlights that the BG 55 and BG 56 share the same engine platform, while the BG 86 offers higher blowing force for demanding jobs. Choosing the right model depends on the scale of your cleanup tasks.

Maintenance Tips for Reliable Starts

• Clean the air filter every 10 hours of operation or after each use in dusty conditions.
• Replace the spark plug annually or after 100 hours to maintain consistent ignition.
• Use fuel stabilizer if the blower will sit unused for more than 30 days; this prevents gum formation.
• Inspect the starter rope for fraying; replace it before it snaps during a pull.
• Check the anti‑vibration mounts for cracks; worn mounts increase operator fatigue and can loosen fasteners.
• Lubricate the throttle cable lightly with a silicone spray to keep the trigger movement smooth.
• Store the blower in a dry, temperature‑controlled area to avoid condensation in the fuel system.

Regular maintenance not only makes starting easier but also prolongs engine life and reduces emissions.

Common Mistakes to Avoid

• Over‑priming the bulb – More than 7 presses can flood the carburetor, especially on a warm engine.
• Leaving the choke on “Full” after the engine fires – This creates a rich mixture that stalls the engine.
• Pulling the starter rope too gently – The Easy2Start system still requires a decisive pull; a weak pull may not engage the flywheel.
• Using stale or incorrect fuel mix – Old gasoline or a wrong oil ratio leads to hard starts and carbon buildup.
• Neglecting the air filter – A clogged filter restricts airflow, causing a lean condition and poor starting.
• Starting on an uneven surface – The blower can shift during the pull, increasing the risk of injury and making the pull less effective.

Avoiding these pitfalls saves time and prevents unnecessary wear on the starter mechanism.

Frequently Asked Questions

How many pulls does it normally take to start a cold BG 55?

With the choke set to full, the primer bulb pressed 5–7 times, and the throttle lock engaged, most users achieve ignition within 2–4 pulls. If it takes more than 6 pulls, check for flooding or fuel issues.

Can I use regular 87‑octane gasoline in the BG 55?

Stihl recommends a minimum of 89‑octane unleaded gasoline. Lower octane can cause knocking and hard starting, especially under load.

Why does the engine die a few seconds after starting?

This often indicates the choke was left on too long, creating an overly rich mixture. Move the choke to half or run position as soon as the engine fires, and let it warm up before applying full throttle.

How often should I replace the fuel filter?

Inspect the fuel filter each season. Replace it annually or whenever you notice reduced fuel flow, which can manifest as sputtering or difficulty starting.

Is the Easy2Start system maintenance‑free?

The system reduces pulling effort but still relies on a spring and ratchet mechanism. Periodically check the starter rope and recoil spring for wear; lubricate the recoil spring lightly with a non‑gumming oil if the pull feels stiff.

Conclusion

Mastering the startup routine for the Stihl BG 55 blower gives you confidence that the tool will perform when you need it most. By following the safety precautions, completing the pre‑start checks, and executing the step‑by‑step starting sequence, you minimize the risk of flooding, reduce starter rope wear, and ensure a clean, quick ignition every time. Remember to differentiate between cold and warm starts, keep the fuel fresh, and maintain the air filter, spark plug, and fuel system on schedule. The comparison table shows where the BG 55 fits in the Stihl lineup, helping you decide if it meets your workload demands. With regular maintenance and awareness of common mistakes, the BG 55 will deliver reliable blowing power for many seasons. Apply these practices, and you’ll spend less time troubleshooting and more time clearing leaves efficiently.