Caleb MorganBy Caleb Morgan

Updated November 2026

The Stihl leaf blower BG 50 is a lightweight, handheld gas blower aimed at homeowners who want to clear driveways, patios and gutters without hauling a heavy machine around. This guide walks you through what the BG 50 is good for, how to mix fuel and start it correctly, how to set up the nozzle and throttle for different jobs, and how to keep it running with basic maintenance. By the end, you should be able to start the blower on the first few pulls, match its settings to the task, and spot the problems that most often cause frustration.

What the Stihl BG 50 Is Built For

The BG 50 is a two-stroke handheld blower in Stihl’s compact line. Manufacturers position it for light to medium residential work: sweeping leaves off lawns, clearing clippings from walkways, and blowing debris out of flower beds. It is not designed for heavy wet leaves packed against a fence line or for commercial all-day use. Owners often report that its strength is convenience, since it is light enough to hold in one hand for short sessions and starts without much effort once it is warm and properly fueled.

Shopping for one? See our guide: 7 Best Stihl Battery Leaf Blower Options Compared for Home Yards (2026).

Before you buy or set one up, check the exact model variant and the engine displacement listed on the decal or in the owner’s manual. Stihl sells related handheld blowers that look similar, so confirm you are working with the BG 50 and not a neighboring model with different fuel and maintenance intervals.

Fuel Mixing and Oil Requirements

Because the BG 50 is a two-stroke engine, it does not run on straight gasoline. It needs a premixed blend of gasoline and two-stroke oil. Stihl’s manual specifies the ratio, and it is the number you should follow rather than any figure from a forum post. Stihl’s own two-stroke oil is formulated for their engines, and many owners use it for simplicity, but any oil that meets the manufacturer’s rating for air-cooled two-stroke engines is generally acceptable.

Use these general practices:

  • Mix fuel in a clean, approved container, not directly in the blower’s tank.
  • Shake the mixture before pouring, especially if it has sat for a few days.
  • Use fresh fuel. Gasoline with ethanol can lose its combustibility within weeks, and stale mix is one of the most common causes of hard starting.
  • Do not store leftover mix for more than about 30 days. Mix only what you expect to use in a month or so.

If you are unsure about the exact ratio or fuel grade for your specific serial range, consult the owner’s manual or a authorized Stihl dealer before mixing.

Step-by-Step: Starting the BG 50

Most starting problems come from skipping one of the choke or throttle steps. Follow this sequence each time you start a cold engine.

  1. Place the blower on flat, clear ground. Keep the nozzle pointed away from you and from people or pets.
  2. Check the fuel and oil level. Fill the tank with the premixed fuel and confirm there are no leaks around the cap or lines.
  3. Press the primer bulb (if your model has one) five to ten times, until fuel is visible in the bulb.
  4. Set the choke to the full or start position for a cold engine.
  5. Hold the blower firmly by the rear handle with your left hand and keep your right hand on the starter grip. Pull the starter cord with a firm, smooth stroke, not a jerk. Repeat until the engine fires.
  6. Once it fires, move the choke to the half or run position. Let it idle for 20 to 30 seconds.
  7. Push the choke fully to run and bring the throttle up to work speed.

If the engine floods, which you will notice as a strong fuel smell and no firing even after several pulls, set the choke to run, hold the throttle wide open, and pull the cord several times to clear the cylinder. Then reset and try again from the cold-start sequence.

Nozzle, Throttle and Speed Settings

The BG 50 is used for different jobs, and small changes in technique make a big difference. Think of the throttle as your main control over air volume and speed, and the nozzle as your way of focusing that air.

Matching the Throttle to the Job

  • Light debris on hard surfaces: Use moderate throttle. Full throttle can scatter loose material back onto areas you have already cleaned.
  • Dry leaves on lawns: Use medium to high throttle and sweep in a steady arc, working from one side of the yard to the other.
  • Damp or matted debris: Work slowly and in multiple passes. Trying to move a heavy, wet mass in one pass tends to waste fuel and tire you out.

Holding Position and Sweep Technique

Keep the nozzle about 6 to 12 inches above the ground for most surfaces. Aim it at a slight angle, roughly 30 to 45 degrees, so the air pushes debris forward rather than just stirring it up. Walk at a steady pace and overlap each pass by about a third of the nozzle width. This keeps you from leaving thin lines of leaves behind.

Routine Maintenance That Keeps the BG 50 Running

Basic upkeep prevents most breakdowns. Build these tasks into your routine:

Task When to Do It What to Look For
Check air filter After each use in dusty conditions Clogged mesh, debris packed in the filter cover
Clean cooling fins Every few uses Grass and dust blocking airflow around the cylinder
Inspect spark plug Seasonally or if starting gets hard Heavy carbon, oil fouling, cracked insulator
Check fuel lines and cap Monthly during use season Cracks, stiffness, leaks or a loose cap
Drain fuel for storage Before long periods of non-use Run the engine until it stalls to clear the carburetor

Clean the air filter by tapping it gently and rinsing it if the manual allows. Replace it when it is torn or stays dirty after cleaning. Do not run the blower with the filter removed, since dirt will enter the engine quickly.

Common Mistakes

  • Using straight gasoline or the wrong oil ratio, which can damage the engine.
  • Storing fuel mix for many months and then wondering why the blower will not start.
  • Starting the engine with the choke in the wrong position.
  • Ignoring a clogged air filter until performance drops noticeably.
  • Running at full throttle for the entire job, which wastes fuel and makes the blower harder to control.
  • Pointing the nozzle at people, pets or windows, which can send debris flying.

Tips for Better Results

  • Clear the largest debris first by hand or with a rake so the blower handles only the fine material.
  • Work with the wind when you can, so you are not blowing debris back at yourself.
  • Keep a small kit of the correct spark plug and a clean rag in your garage so routine service is quick.
  • Write down the date you last serviced the air filter and plug. It is easy to forget between seasons.
  • Wear eye protection and hearing protection. Blowers produce debris and noise levels that call for both.

A few accessories make the BG 50 easier to maintain and use. Look for these categories:

  • Two-stroke premix oil formulated for air-cooled engines: Using the correct oil keeps the engine lubricated and reduces carbon buildup. View on Amazon
  • Replacement spark plug matched to your engine: Confirm the part number in the manual before ordering. A fresh plug helps with starting and idle. View on Amazon
  • Ethanol-free or fuel stabilizer additive: A stabilizer helps stored fuel stay usable over the off-season. View on Amazon
  • Hearing and eye protection: Blowers are loud and kick up fine debris, so protective gear is worth keeping near the tool. View on Amazon

FAQ

What fuel does the Stihl BG 50 use?

It uses a premixed blend of gasoline and two-stroke oil. Check the owner’s manual for the correct ratio and fuel grade for your model.

Why will my BG 50 not start?

The most common causes are stale fuel, an incorrect choke position, a flooded engine, or a fouled spark plug. Work through the cold-start steps and check the plug and fuel first.

How often should I clean the air filter?

Check it after each session in dusty or dry conditions, and clean it whenever airflow seems reduced. Replace it if it is damaged.

Can I store fuel mix in the blower over winter?

It is better to drain the tank or run the engine dry before storage, since old fuel can gum up the carburetor. Consult the manual for the storage procedure.

Is the BG 50 suitable for heavy wet leaves?

It works best on light to moderate debris. For heavy, wet material, consider a more powerful blower or a rake to remove the bulk first.

How do I know if the spark plug needs replacing?

Signs include hard starting, rough idle, misfiring, and visible heavy carbon or oil on the electrode. Replace it with the part specified in the manual.

Should I hire a technician for major repairs?

Yes. For carburetor rebuilds, compression problems or any work you are unsure about, consult a qualified Stihl service professional.

Conclusion

The Stihl BG 50 rewards owners who mix fuel correctly, follow the cold-start sequence, and keep the air filter and spark plug clean. Match the throttle and nozzle angle to the job, and work in overlapping passes for the cleanest results. A little routine attention each season will keep the blower dependable for years of yard cleanup.

Ready to choose one?

Caleb Morgan

About Caleb Morgan

Caleb Morgan is part of our editorial team and reviews and edits our garden hand tools & equipment guides, checking product details against manufacturer specifications and owner feedback.