How to Start Stihl Bg 50 Leaf Blower? Easy Start Steps

Introduction

The Stihl BG 50 is a lightweight, handheld leaf blower favored by homeowners and landscaping professionals for its balance of power and maneuverability. Knowing how to start Stihl BG 50 leaf blower correctly ensures reliable operation, reduces wear on the engine, and keeps the operator safe. This guide walks through every aspect of the starting process, from pre‑start checks to troubleshooting common problems, and includes maintenance advice that extends the life of the machine.

Table of Contents

• Introduction
• Understanding the Stihl BG 50
• Safety Precautions Before Starting
• Required Tools and Materials
• Step-by-Step Starting Procedure
• Cold Start vs Warm Start Differences
• Troubleshooting Common Starting Issues
• Maintenance Tips for Reliable Starts
• Comparison Table: Stihl BG 50 vs Competitors
• Best Practices for Longevity
• Common Mistakes to Avoid
• Frequently Asked Questions
• Conclusion

Understanding the Stihl BG 50

The BG 50 features a 27.2 cc two‑stroke engine that delivers a maximum air velocity of 159 mph and an air volume of 412 cfm. Its compact design weighs only 8.6 pounds, making it easy to handle for extended periods. The blower uses a primer bulb, choke lever, and a recoil starter, all of which play a role in the starting sequence. Familiarity with these components helps the operator execute each step confidently and reduces the chance of flooding the engine.

Fuel for the BG 50 must be a 50:1 mixture of unleaded gasoline and high‑quality two‑stroke oil. Using the correct ratio prevents carbon buildup and ensures smooth combustion. The fuel tank holds 14.2 fluid ounces, providing roughly 30 minutes of run time at full throttle. The air filter is a foam element that should be inspected before each use; a clogged filter restricts airflow and makes starting difficult.

Safety Precautions Before Starting

Before attempting to start the blower, always wear hearing protection, safety glasses, and sturdy gloves. The high‑velocity air stream can propel debris at dangerous speeds, so clear the work area of bystanders, pets, and loose objects. Verify that the blower is on a stable, flat surface and that the throttle trigger is in the idle position. Never start the engine in an enclosed space; carbon monoxide from the two‑stroke exhaust can accumulate quickly.

Check the fuel cap for a tight seal to avoid spills, and ensure the spark plug boot is securely attached. If the machine has been stored for an extended period, drain old fuel and replace it with a fresh mixture. Inspect the recoil starter rope for fraying; a damaged rope can snap during a pull, causing injury. Finally, confirm that the choke lever moves freely between the “cold” and “run” positions.

Required Tools and Materials

To start and maintain the BG 50 you will need the following items: a clean container for mixing fuel at a 50:1 ratio, a funnel to avoid spills, a spark plug wrench (typically 13/16 inch), a small brush for cleaning the air filter, and a lint‑free cloth for wiping the exterior. A torque wrench is optional but useful for reinstalling the spark plug to the manufacturer’s specification of 15–20 Nm. Keep a spare spark plug (NGK BPMR7A or equivalent) on hand for quick replacement if the engine fails to fire.

Having a small bottle of carburetor cleaner can help clear minor deposits in the carburetor throat, which sometimes cause hard starting. A fuel stabilizer is recommended if the blower will sit unused for more than 30 days; it prevents gum formation in the fuel system. All tools should be stored in a dry place to avoid corrosion.

Step-by-Step Starting Procedure

1. Place the blower on a flat surface and ensure the throttle trigger is fully released (idle position).
2. Turn the fuel valve to the “ON” position if your model is equipped with one.
3. Press the primer bulb 5–7 times until fuel is visible in the bulb; this draws fresh mixture into the carburetor.
4. Move the choke lever to the “COLD START” (full choke) position.
5. Grasp the starter handle firmly, place your foot on the blower housing for stability, and pull the recoil rope briskly until you feel resistance, then give a strong, steady pull.
6. When the engine coughs or fires, immediately move the choke lever to the “RUN” (half choke) position.
7. Pull the starter rope again if the engine does not continue running; usually one or two additional pulls are sufficient.
8. Allow the engine to warm up for 15–30 seconds at idle before engaging the throttle to full speed.
9. If the engine stalls after moving to “RUN”, return the choke to “COLD START” and repeat steps 5–7.

Following this sequence ensures the correct air‑fuel mixture for ignition and prevents flooding. The primer bulb supplies fuel, the choke enriches the mixture for a cold engine, and the recoil starter provides the mechanical energy needed for the first combustion event.

Cold Start vs Warm Start Differences

A cold start occurs when the engine has not run for at least 30 minutes and the cylinder is at ambient temperature. In this condition the fuel vaporizes less readily, so the choke must be fully engaged to enrich the mixture. A warm start, by contrast, is performed shortly after the engine has been running; the residual heat helps fuel vaporize, so the choke can be set to the half‑choke or even the “RUN” position immediately.

Attempting a warm start with the choke fully closed often floods the spark plug, leading to a no‑start condition. Conversely, trying a cold start without the choke engaged usually results in the engine turning over but not firing. Recognizing the engine’s temperature state and adjusting the choke accordingly is a key skill for consistent starts.

Troubleshooting Common Starting Issues

If the blower fails to start after several pulls, first verify that the fuel is fresh and correctly mixed. Stale fuel loses volatility and can cause hard starting. Next, remove the spark plug and inspect the electrode; a wet, blackened plug indicates flooding, while a dry, white plug suggests a lean condition or ignition fault. Clean or replace the plug as needed, and check the spark plug gap (0.6–0.7 mm).

Examine the air filter; a saturated foam filter restricts airflow and mimics a choke‑on condition. Wash the filter in warm, soapy water, rinse thoroughly, and allow it to dry before reinstalling. If the recoil starter rope pulls with no resistance, the starter pawls may be worn or the flywheel key sheared; professional service is recommended for internal starter repairs. Finally, ensure the carburetor’s idle and high‑speed screws are set to factory specifications; improper adjustment can cause lean or rich mixtures that hinder starting.

Maintenance Tips for Reliable Starts

Regular maintenance dramatically reduces starting problems. After each use, empty the fuel tank if the blower will be stored for more than a week; run the engine until it stops to clear the carburetor. Clean the air filter every 10 hours of operation, or more often in dusty conditions. Inspect the spark plug every 25 hours and replace it annually or whenever the electrode shows excessive wear.

Lubricate the recoil starter spring lightly with a few drops of light machine oil to keep the pull smooth. Check the fuel lines for cracks or stiffness; replace them at the first sign of deterioration. Keep the cooling fins on the cylinder free of debris; blocked fins cause overheating, which can damage the piston and make future starts harder. Store the blower in a dry, temperature‑controlled environment to prevent condensation in the fuel system.

Comparison Table: Stihl BG 50 vs Competitors

The table highlights that the BG 50 offers a competitive balance of weight, power, and price. While the Husqvarna 125B delivers slightly higher velocity, it is heavier. The Echo PB-2520 is marginally lighter but produces less air volume. All three models share the same 50:1 fuel ratio and recoil‑primer starting system, making the starting procedure similar across brands.

Best Practices for Longevity

Adopt a routine of pre‑use inspection: verify fuel level, check the air filter, and confirm the spark plug boot is seated. Use only high‑octane (89+ AKI) gasoline and a reputable two‑stroke oil certified for air‑cooled engines. Mix fuel in small batches to avoid long‑term storage degradation. After each session, let the engine idle for a minute before shutting off; this allows the carburetor to clear residual fuel and reduces gum formation.

Sharpen the blower’s impeller blades annually if you notice reduced airflow; a dull impeller forces the engine to work harder, increasing wear. Keep the muffler screen clean; carbon buildup restricts exhaust flow and raises cylinder temperature. Finally, follow the manufacturer’s service schedule for professional inspection of the crankshaft bearings and piston rings every 200 hours of operation.

Common Mistakes to Avoid

One frequent error is over‑priming the bulb, which floods the carburetor and wets the spark plug. Limit priming to the recommended 5–7 presses. Another mistake is leaving the choke in the full‑closed position after the engine fires; this creates an overly rich mixture that stalls the engine. Always transition to the “RUN” position as soon as the engine catches.

Using automotive two‑stroke oil or an incorrect mix ratio leads to carbon deposits and poor lubrication. Never operate the blower with a damaged or missing air filter; unfiltered air introduces abrasive particles that accelerate engine wear. Finally, pulling the starter rope too slowly or at an angle can cause the rope to slip or the pawls to engage improperly, resulting in a no‑start condition.

Frequently Asked Questions

How many pulls does it normally take to start a cold Stihl BG 50?

A cold engine typically starts within 2–4 pulls if the fuel is fresh, the primer is used correctly, and the choke is set to the full‑choke position. More than six pulls usually indicates a flooding or ignition issue.

Can I use regular 87‑octane gasoline in the BG 50?

Stihl recommends a minimum of 89‑octane (AKI) fuel. Lower octane can cause knocking and long‑term engine damage, especially under load.

Why does the engine die immediately after I move the choke to “RUN”?

This usually means the engine is still too cold or the carburetor is slightly lean. Allow a few more seconds of warm‑up at half choke before moving to “RUN”, or adjust the idle screw slightly richer.

How often should I replace the spark plug?

Replace the spark plug at least once per season or every 100 hours of operation, whichever comes first. Inspect it every 25 hours for fouling or wear.

Is it okay to store the blower with fuel in the tank over winter?

It is not recommended. Fuel left for more than 30 days can degrade, forming gum that clogs the carburetor. Drain the tank and run the engine dry before long‑term storage, or add a fuel stabilizer and run the engine briefly to circulate treated fuel.

Conclusion

Starting the Stihl BG 50 leaf blower reliably comes down to a disciplined routine: use fresh 50:1 fuel, prime the bulb, set the choke correctly, and pull the recoil with a smooth, strong motion. Understanding the difference between cold and warm starts, maintaining the air filter and spark plug, and avoiding common pitfalls such as over‑priming or leaving the choke engaged will keep the blower firing on the first or second pull every time. Regular maintenance and proper storage further extend the machine’s service life, ensuring that the BG 50 remains a dependable tool for yard cleanup season after season.