How to Start a Stihl Bg50 Leaf Blower?

Introduction

The Stihl BG50 is one of the most popular lightweight gas-powered leaf blowers on the market, favored by homeowners and professional landscapers alike for its balance of power, portability, and ease of use. Whether you’re clearing autumn leaves from your driveway, tidying up grass clippings after mowing, or blowing light snow off walkways, a well-maintained BG50 makes quick work of outdoor cleanup tasks. That said, many new users struggle with how to start a Stihl BG50 leaf blower? especially if they are unfamiliar with 2-stroke engine operation. Unlike electric blowers that start with the push of a button, gas-powered models like the BG50 require a specific sequence of steps to get the engine running reliably, and small mistakes like incorrect fuel mixing or choke positioning can lead to frustrating no-starts or flooding. This comprehensive guide walks you through every step of starting your BG50, from pre-start safety checks to troubleshooting common issues, so you can get your blower running in seconds every time. We’ll also cover essential maintenance tips and best practices to keep your BG50 performing at its best for years to come.

• Understanding Your Stihl BG50 Leaf Blower
  • Key Components of the BG50
• Pre-Start Safety Checks
• Step-by-Step Guide to Starting a Stihl BG50
  • Cold Start Procedure (Engine at Room Temperature)
  • Warm Start Procedure (Engine Already Running or Recently Used)
• Fuel Mixing and Preparation for the BG50
• Common Starting Problems and Fixes
• Maintenance Tips to Keep Your BG50 Running Smoothly
• Best Practices for Long-Term Use
• Comparison of Starting Methods for Stihl Leaf Blowers
• Frequently Asked Questions
• Conclusion

Understanding Your Stihl BG50 Leaf Blower

Before diving into the starting process, it’s helpful to understand the basic design and function of the Stihl BG50. This blower is powered by a 27.6 cc 2-stroke gasoline engine, which delivers air speeds up to 180 mph and airflow of 400 cfm, enough to tackle wet leaves, gravel, and light debris with ease. Unlike 4-stroke engines that have separate oil and fuel systems, 2-stroke engines require a pre-mixed blend of gasoline and 2-stroke oil to lubricate internal components while running. This design makes the BG50 lighter and more compact, but it also means proper fuel preparation is critical for reliable starting and long engine life.

Key Components of the BG50

Familiarizing yourself with the parts of the BG50 that relate to starting will make the process far less intimidating. The most important components for starting include the primer bulb, choke lever, throttle trigger, stop switch, air filter, and starter cord, all located on the top and side of the engine for easy access during operation. Taking a minute to locate these parts before your first start will save you time and frustration later, especially if you are new to gas-powered outdoor equipment.

Pre-Start Safety Checks

Skipping pre-start safety checks is one of the most common mistakes new BG50 users make, and it can lead to injury, equipment damage, or fire hazards. Taking 2-3 minutes to complete these checks before every start will ensure safe, reliable operation:

1. Inspect for fuel leaks: Check the fuel tank, fuel lines, and carburetor for any signs of cracks, leaks, or spilled fuel. If you smell gasoline or see visible leaks, do not attempt to start the blower until the issue is fixed, as fuel leaks pose a serious fire risk.
2. Place the blower on a flat, stable surface: Never try to start the BG50 while holding it, as the sudden jerk of the starter cord can cause you to lose control and drop the blower. Set it on level ground, away from obstacles, and stand firmly with your feet planted.
3. Clear the work area: Make sure there are no bystanders, pets, or loose debris within 10 feet of the blower when starting, as the starter cord can snap back unexpectedly, and the blower will expel high-speed air as soon as it starts.
4. Wear appropriate safety gear: Always wear safety goggles to protect your eyes from flying debris, ear protection to guard against the blower’s loud noise (which can exceed 100 dB), and sturdy gloves to improve your grip on the handle and starter cord.
5. Check the throttle and stop switch positions: Confirm the throttle trigger is released (in the idle position) and the stop switch is set to “run.” If the stop switch is in the “off” position, the engine will not start regardless of other steps.
6. Inspect the air filter: Remove the air filter cover and check the filter for dirt, debris, or clogs. A dirty air filter will restrict airflow and make starting extremely difficult, so clean it with warm soapy water if it is dirty, and let it dry completely before reassembling.

These checks only take a few minutes but will prevent most common starting issues and keep you safe while operating your blower.

Step-by-Step Guide to Starting a Stihl BG50

Once you’ve completed your pre-start safety checks, follow the correct starting procedure for your engine’s temperature. The BG50 requires a different process for cold starts (engine at room temperature, or has not been run in more than 15 minutes) and warm starts (engine was running recently and is still warm). Using the wrong procedure for your engine’s temperature is the most common cause of flooding and no-starts.

Cold Start Procedure (Engine at Room Temperature)

Follow these steps exactly for a cold engine to get your BG50 running smoothly:

1. Set the BG50 on a flat, stable surface, and confirm the stop switch is in the “run” position and the throttle trigger is released.
2. Press the primer bulb 5 to 7 times, pausing briefly between presses. You will see fuel fill the primer bulb as it pumps fuel into the carburetor. Do not press the bulb more than 7 times, as this will flood the engine with excess fuel.
3. Move the choke lever to the full choke position, marked with a closed butterfly symbol or an “X” on the lever. This enriches the fuel-air mix to make ignition easier for a cold engine.
4. Pull the starter cord slowly 2 to 3 times to let fuel flow into the engine cylinder. Do not pull the cord all the way out during these initial pulls, as this can damage the starter mechanism.
5. After the initial slow pulls, grasp the starter handle firmly and pull the cord quickly and fully 3 to 5 times. You will hear the engine sputter or fire briefly as it ignites.
6. As soon as the engine fires (even if it only runs for a second), immediately move the choke lever to the half choke or run position, depending on your model. If you leave the choke on full after the engine fires, it will flood and die.
7. Once the engine runs consistently, let it idle for 30 seconds to warm up. Squeeze the throttle trigger briefly to rev the engine, and confirm it runs smoothly without sputtering before beginning work.

Warm Start Procedure (Engine Already Running or Recently Used)

If you have used the BG50 within the last 15 minutes, the engine is still warm and requires a simplified starting process:

1. Place the blower on a flat surface, and confirm the stop switch is in the “run” position.
2. Do not press the primer bulb at all. The warm engine already has fuel in the carburetor, and pressing the primer will add excess fuel and cause flooding.
3. Set the choke lever to the half choke position if the engine has been off for 5 to 15 minutes. If the engine was turned off less than 5 minutes ago, leave the choke in the off/run position entirely.
4. Pull the starter cord firmly 1 to 2 times. The warm engine should start almost immediately.
5. Let the engine idle for 10 to 15 seconds to stabilize, then squeeze the throttle to engage full power and begin working.

If the warm engine does not start after 2 pulls, it may have cooled down enough to require the full cold start procedure instead.

Fuel Mixing and Preparation for the BG50

Proper fuel preparation is one of the most critical factors in reliable BG50 starting, as incorrect fuel mix or old fuel is the cause of nearly half of all starting issues. The BG50 uses a 2-stroke engine, which requires a precise mix of unleaded gasoline and 2-stroke oil to lubricate internal moving parts while running. Never use regular motor oil in place of 2-stroke oil, as it is not designed to burn cleanly in 2-stroke engines and will cause carbon buildup, clog the exhaust, and damage the engine over time. (See Also:How To Clean Stihl Leaf Blower)

The recommended fuel-to-oil ratio for the Stihl BG50 is 50:1, which translates to 2.6 fluid ounces of 2-stroke oil per 1 gallon of unleaded gasoline. Use only high-quality 2-stroke oil designed for air-cooled engines to ensure proper lubrication and reduce carbon buildup.

When selecting gasoline, use fresh, unleaded 87 octane fuel with no more than 10% ethanol content. Ethanol-blended fuel absorbs water from the air over time, which can cause corrosion in the carburetor and fuel lines, and degrade rubber seals. If you cannot find ethanol-free fuel, add a fuel stabilizer to the mix to slow degradation.

To mix fuel correctly, always mix it in an approved fuel container outside of the blower’s tank. Add the measured 2-stroke oil to the container first, then add the correct amount of gasoline. Seal the container and shake it vigorously for 30 seconds to ensure the oil is fully mixed with the gas. Never mix fuel directly in the BG50’s tank, as this can lead to an inconsistent mix and starting issues.

Never use fuel that is older than 30 days, even if it has been stored in a sealed container. Gasoline degrades quickly when exposed to air, and old fuel will leave varnish deposits in the carburetor that clog jets and prevent the engine from starting. If you have leftover mixed fuel after use, store it in an airtight container in a cool, dry place for up to 30 days, then dispose of it at a local hazardous waste facility if unused.

Common Starting Problems and Fixes

Even with proper technique, you may occasionally run into starting issues with your BG50. Below are the most common problems and their quick fixes:

Most starting issues can be resolved at home with basic tools, but if you have tried all troubleshooting steps and the blower still will not run, contact a Stihl authorized service center for professional repair.

Maintenance Tips to Keep Your BG50 Running Smoothly

Regular maintenance is the best way to prevent starting issues and extend the life of your Stihl BG50. Follow these simple maintenance tasks after every 5 hours of use, or at least once per season:

1. Clean the air filter: Remove the air filter cover and take out the foam filter. Wash it with warm soapy water, rinse thoroughly, and let it air dry completely before reinstalling. A clogged air filter reduces airflow and makes starting much harder, and can cause permanent engine damage if left unaddressed.
2. Inspect and clean the spark plug: Remove the spark plug with a spark plug wrench and check for carbon buildup, oil residue, or wear. Clean the plug with a wire brush and a little solvent, or replace it if it is worn or damaged. When installing a new spark plug, confirm the gap is set to 0.02 inches for proper ignition. A fouled spark plug will not create a strong enough spark to ignite the fuel-air mix, leading to no-starts.
3. Check the fuel lines: Inspect the rubber fuel lines for cracks, splits, or signs of wear. Replace any damaged lines immediately to prevent fuel leaks and engine damage.
4. Clean the blower exterior: After each use, wipe down the outside of the blower with a damp cloth to remove grass, leaves, and debris. Buildup around the air intake and starter cord can cause overheating and starting issues.

Performing these quick maintenance tasks will keep your BG50 running reliably and reduce the need for costly repairs down the line.

Best Practices for Long-Term Use

In addition to regular maintenance, following these best practices will extend the life of your BG50 and ensure it starts reliably every time: (See Also:What Is The Best Battery Leaf Blower To Buy)

• Use fuel stabilizer for long-term storage: If you store the BG50 for more than 30 days, add a fuel stabilizer to the gas before mixing it with oil. Stabilizer prevents fuel from degrading and clogging the carburetor jets. For storage longer than 3 months, drain the fuel tank completely and run the engine until it stalls to clear all fuel from the carburetor.
• Store the blower in a dry, cool place: Avoid storing the BG50 in direct sunlight, damp garages, or freezing temperatures, as extreme heat and cold can damage rubber seals, fuel lines, and the engine.
• Avoid prolonged full-throttle operation: Running the blower at full throttle for more than 30 minutes at a time can overheat the engine. Let the blower cool down for 5-10 minutes after extended use to prevent heat damage to internal components.
• Never modify the engine or exhaust: Removing the muffler or modifying the engine to increase power will void your warranty, reduce engine life, and create safety hazards from excessive noise and exhaust fumes.
• Use only Stihl-approved replacement parts: When replacing spark plugs, air filters, or other components, use parts designed specifically for the BG50 to ensure proper fit and performance.

These simple habits will keep your BG50 running like new for years, even with regular use during peak yard work season.

Comparison of Starting Methods for Stihl Leaf Blowers

While the BG50 uses the standard cold and warm start procedures outlined above, other Stihl leaf blower models may have slightly different starting mechanisms, such as electric start or EasyStart technology. Below is a comparison of starting methods across common Stihl leaf blower lines to help you understand how the BG50’s process fits into the broader Stihl lineup:

While electric and battery-powered Stihl blowers offer easier starting, the BG50’s manual start process is simple to master with practice, and its gas-powered design delivers more power and runtime for larger cleanup jobs.

Frequently Asked Questions

Can I use regular gasoline in my BG50?

Yes, you can use regular unleaded 87 octane gasoline in your BG50, but it is best to avoid fuel with more than 10% ethanol content if possible. Ethanol absorbs water from the air over time, which can cause corrosion in the carburetor and fuel lines, and degrade rubber seals. If you must use ethanol-blended fuel, add a fuel stabilizer to the mix to slow degradation and protect engine components.

Why does my BG50 keep flooding when I try to start it?

Flooding occurs when too much fuel enters the engine cylinder, preventing the spark plug from igniting the air-fuel mix. This is almost always caused by user error: pressing the primer bulb too many times during a cold start, leaving the choke on full after the engine fires, or pressing the primer bulb when starting a warm engine. To fix a flooded BG50, remove the spark plug, pull the starter cord 3 to 4 times to clear excess fuel from the cylinder, let the plug dry for 5 minutes, reinstall it, and follow the correct starting procedure for your engine’s temperature.

How often should I change the fuel mix in my BG50?

You should never store mixed fuel in the BG50’s tank for more than 30 days. Fresh 2-stroke fuel mix degrades quickly, especially if it contains ethanol, and old fuel will leave varnish deposits in the carburetor that clog jets and make starting impossible. If you have leftover mixed fuel after use, store it in an airtight container in a cool, dry place for up to 30 days, then dispose of it at a local hazardous waste facility if you have not used it. (See Also:Is A 20v Leaf Blower Worth It)

What should I do if the starter cord won’t pull?

A stuck starter cord is usually caused by engine seizure from old, degraded fuel left in the carburetor. First, try adding a small amount of fresh mixed fuel to the tank and let it sit for 10 minutes to loosen any varnish buildup. If the cord still won’t pull, you may need to remove the starter assembly and clean the carburetor, or take the blower to a Stihl authorized service center for repair. Never force the starter cord, as this can break the internal recoil mechanism and lead to costly repairs.

Conclusion

Mastering how to start a Stihl BG50 leaf blower? is far simpler than it may seem at first, as long as you follow the correct procedure for your engine’s temperature and take the time to complete pre-start safety checks and proper fuel preparation. The key to reliable starting is using the right fuel mix at the correct 50:1 ratio, priming the engine only when necessary for cold starts, and setting the choke correctly for your engine’s temperature. Most common starting issues, including flooding and no-starts, can be traced to simple mistakes like over-priming, using old fuel, or a clogged air filter, all of which are easy to fix at home with basic tools.

By following the maintenance tips and best practices outlined in this guide, you can keep your BG50 running smoothly for years, even with regular use during peak yard work season. Whether you’re a first-time gas-powered blower user or a seasoned landscaper, these steps will help you get the most out of your Stihl BG50 with minimal frustration. If you do run into persistent starting issues that you cannot resolve with the troubleshooting steps listed, reach out to a Stihl authorized service center for professional assistance to avoid causing further damage to the engine.