BG 65 Stihl Blower Spark Fix (5 Pro Tips for Tough Starts)
It’s estimated that roughly 75 million households in the United States alone use wood-burning stoves or fireplaces as a primary or secondary heat source. Ensuring that your equipment, like a BG 65 Stihl blower, is in top working order is crucial, especially when facing tough starts due to spark issues. I’ve spent countless hours in the woods, felling trees, processing timber, and preparing firewood. A non-starting blower can be incredibly frustrating, especially when you’re relying on it to clear debris or prep your work area. Let’s dive into five pro tips for fixing spark issues on your BG 65 Stihl blower, ensuring it starts reliably every time.
BG 65 Stihl Blower Spark Fix (5 Pro Tips for Tough Starts)
A reliable spark is the heart of any small engine, including the BG 65 Stihl blower. Without a strong, consistent spark, the fuel-air mixture won’t ignite, and your blower simply won’t start. These tips cover the most common causes of spark issues and provide step-by-step solutions to get your blower running smoothly again.
1. Understanding the Basics of Spark Ignition
Before diving into the troubleshooting, it’s important to understand the fundamental components involved in the spark ignition system of a small engine. This includes the spark plug, ignition coil, and flywheel.
- Spark Plug: This small but crucial component is responsible for creating the spark that ignites the fuel-air mixture. The spark plug has two electrodes separated by a small gap. When high voltage is applied, a spark jumps across this gap, initiating combustion.
- Ignition Coil: The ignition coil is a transformer that takes the low voltage from the engine’s electrical system and steps it up to the high voltage required to create a spark at the spark plug. It’s a critical component in the ignition system.
- Flywheel: The flywheel is a rotating component connected to the engine’s crankshaft. It contains magnets that pass by the ignition coil, inducing a voltage that is then amplified by the coil to produce the spark.
Key Concepts:
- Air-Fuel Mixture: The correct ratio of air and fuel is essential for proper combustion. Too much or too little fuel can prevent the engine from starting.
- Compression: The engine needs to compress the air-fuel mixture to create the necessary conditions for ignition.
- Timing: The spark needs to occur at the correct moment in the engine’s cycle for optimal performance.
2. Tip #1: Inspect and Clean the Spark Plug
The spark plug is often the first suspect when dealing with starting problems. A fouled or damaged spark plug can prevent the engine from generating a spark.
Step-by-Step Guide:
- Locate the Spark Plug: On a BG 65 Stihl blower, the spark plug is typically located under a rubber boot near the engine’s cylinder head.
- Remove the Spark Plug Boot: Gently pull the rubber boot off the spark plug.
- Remove the Spark Plug: Use a spark plug wrench (typically 13/16 inch or 21 mm) to loosen and remove the spark plug. Turn the wrench counterclockwise.
- Inspect the Spark Plug: Examine the spark plug for signs of fouling, such as carbon buildup, oil deposits, or physical damage. A healthy spark plug should have a clean, light brown or gray insulator.
- Clean the Spark Plug: If the spark plug is fouled, clean it using a wire brush or spark plug cleaner. Be careful not to damage the electrode. You can also use a small amount of carburetor cleaner to dissolve stubborn deposits.
- Check the Spark Plug Gap: The spark plug gap is the distance between the center electrode and the ground electrode. Use a spark plug gap tool to ensure the gap is within the manufacturer’s specifications. For the BG 65 Stihl blower, the gap is typically around 0.5 mm (0.020 inches). Adjust the gap by gently bending the ground electrode if necessary.
- Reinstall the Spark Plug: Carefully reinstall the spark plug, tightening it to the manufacturer’s specifications. Usually, this is about 1/4 to 1/2 turn past finger tight. Do not overtighten, as this can damage the cylinder head.
- Reattach the Spark Plug Boot: Push the rubber boot back onto the spark plug, ensuring a secure connection.
Personal Experience:
I once had a BG 65 that refused to start after sitting idle for several months. After checking the fuel and air filter, I decided to inspect the spark plug. It was completely covered in carbon deposits. After cleaning it with a wire brush and adjusting the gap, the blower started on the first pull. This simple fix saved me a trip to the repair shop and got me back to work quickly.
Measurements and Specifications:
- Spark Plug Wrench Size: 13/16 inch (21 mm)
- Spark Plug Gap: 0.5 mm (0.020 inches)
- Cleaning Tools: Wire brush, spark plug cleaner, carburetor cleaner
- Inspection Criteria: Look for carbon buildup, oil deposits, physical damage, and proper gap.
Case Study:
A small landscaping company in my area was experiencing frequent starting problems with their BG 65 blowers. After analyzing their maintenance practices, I discovered that they were using low-quality two-stroke oil, which was causing excessive carbon buildup on the spark plugs. By switching to a higher-quality oil and implementing a regular spark plug cleaning schedule, they significantly reduced their starting problems and extended the life of their blowers.
Strategic Advantage:
Regular spark plug maintenance is a simple and cost-effective way to prevent starting problems and extend the life of your BG 65 Stihl blower. It ensures optimal combustion, which improves fuel efficiency and reduces emissions.
3. Tip #2: Test for Spark
Even if the spark plug looks clean, it might not be producing a spark. It’s essential to test for spark to confirm that the ignition system is functioning correctly.
Step-by-Step Guide:
- Remove the Spark Plug: Follow the steps outlined in Tip #1 to remove the spark plug.
- Attach the Spark Plug Boot: Reattach the spark plug boot to the spark plug.
- Ground the Spark Plug: Hold the spark plug against a metal part of the engine, such as the cylinder head. This provides a ground path for the spark.
- Pull the Starter Cord: Pull the starter cord briskly while observing the spark plug gap. You should see a bright blue spark jump across the gap.
- Observe the Spark: Look for a strong, consistent spark. A weak or intermittent spark indicates a problem with the ignition system.
- Troubleshooting: If there is no spark, or the spark is weak, proceed to the next tips to troubleshoot the ignition coil and other components.
Personal Experience:
I once spent hours trying to start a BG 65 that had been sitting in my shed for a year. I cleaned the carburetor, replaced the fuel, and checked the air filter, but it still wouldn’t start. Finally, I decided to test for spark and discovered that there was no spark at all. This led me to suspect the ignition coil, which turned out to be the problem. Replacing the coil solved the issue, and the blower started right up.
Measurements and Specifications:
- Spark Color: A healthy spark should be bright blue. A weak or yellow spark indicates a problem.
- Spark Consistency: The spark should be consistent and not intermittent.
- Grounding: Ensure the spark plug is properly grounded against a metal part of the engine.
Case Study:
A local rental company was experiencing frequent breakdowns with their BG 65 blowers. After investigating, I found that many of the blowers had damaged spark plug wires, which were causing intermittent spark issues. Replacing the spark plug wires with high-quality replacements resolved the problem and reduced their maintenance costs.
Strategic Advantage:
Testing for spark is a crucial step in diagnosing starting problems. It helps you quickly identify whether the ignition system is the source of the issue, saving you time and effort in troubleshooting other components.
4. Tip #3: Check the Ignition Coil
The ignition coil is responsible for generating the high voltage required to create a spark at the spark plug. A faulty ignition coil can prevent the engine from starting.
Step-by-Step Guide:
- Locate the Ignition Coil: The ignition coil is typically located near the flywheel, underneath the engine cover.
- Inspect the Ignition Coil: Visually inspect the ignition coil for signs of damage, such as cracks, burns, or corrosion.
- Check the Air Gap: The air gap between the ignition coil and the flywheel is critical for proper operation. Use a feeler gauge to ensure the air gap is within the manufacturer’s specifications. For the BG 65 Stihl blower, the air gap is typically around 0.3 mm (0.012 inches). Loosen the mounting screws and adjust the coil as needed.
- Test the Ignition Coil: Use a multimeter to test the ignition coil’s primary and secondary windings. Set the multimeter to the resistance setting and measure the resistance between the coil’s terminals. Compare the readings to the manufacturer’s specifications. A significantly different reading indicates a faulty coil.
- Replace the Ignition Coil: If the ignition coil is damaged or fails the resistance test, replace it with a new coil. Be sure to use a coil that is specifically designed for the BG 65 Stihl blower.
Personal Experience:
I once had a BG 65 that would start intermittently, but then suddenly die after a few minutes of operation. After checking everything else, I suspected the ignition coil. I used a multimeter to test the coil and found that the secondary winding was open. Replacing the coil fixed the problem, and the blower ran perfectly.
Measurements and Specifications:
- Air Gap: 0.3 mm (0.012 inches)
- Testing Tools: Feeler gauge, multimeter
- Resistance Values: Refer to the manufacturer’s specifications for the primary and secondary winding resistance values.
Case Study:
A tree service company was experiencing frequent ignition coil failures on their BG 65 blowers. After analyzing their operating conditions, I discovered that they were using the blowers in extremely hot and humid environments, which was causing the coils to overheat and fail prematurely. By switching to a higher-quality coil that was designed for high-temperature operation, they significantly reduced their coil failures and improved the reliability of their blowers.
Strategic Advantage:
A properly functioning ignition coil is essential for reliable starting and operation. Regular inspection and testing can help you identify potential problems before they lead to complete failure.
5. Tip #4: Examine the Flywheel Key and Magnet
The flywheel and its associated components play a crucial role in generating the spark. The flywheel key ensures proper timing, and the magnets induce voltage in the ignition coil.
Step-by-Step Guide:
- Remove the Flywheel Cover: Remove the engine cover to access the flywheel.
- Inspect the Flywheel Key: The flywheel key is a small metal piece that fits into a slot on the crankshaft and the flywheel. It ensures that the flywheel is properly aligned with the crankshaft. Inspect the flywheel key for signs of damage, such as shearing or bending. A damaged flywheel key can cause timing problems and prevent the engine from starting.
- Inspect the Flywheel Magnets: The flywheel contains magnets that pass by the ignition coil, inducing a voltage that is then amplified by the coil to produce the spark. Inspect the magnets for signs of damage, such as cracks or missing pieces. Also, check for debris or rust that may be interfering with the magnetic field.
- Clean the Flywheel and Ignition Coil: Clean the flywheel and ignition coil with a clean cloth to remove any debris or rust.
- Replace Damaged Components: If the flywheel key or magnets are damaged, replace them with new components.
Personal Experience:
I once worked on a BG 65 that had been dropped, and it wouldn’t start afterward. After checking the usual suspects, I decided to inspect the flywheel. I discovered that the flywheel key had sheared off, causing the timing to be completely off. Replacing the flywheel key solved the problem, and the blower started right up.
Measurements and Specifications:
- Flywheel Key: Ensure the flywheel key is properly aligned and not damaged.
- Flywheel Magnets: Check for cracks, missing pieces, and debris.
- Cleaning Supplies: Use a clean cloth to remove debris and rust.
Case Study:
A landscaping crew was experiencing frequent starting problems with their BG 65 blowers after using them in dusty conditions. After investigating, I found that the flywheel magnets were covered in a thick layer of dust and debris, which was interfering with the magnetic field and preventing the engine from generating a spark. Cleaning the flywheel and ignition coil regularly resolved the problem and improved the reliability of their blowers.
Strategic Advantage:
Ensuring that the flywheel key and magnets are in good condition is crucial for proper timing and spark generation. Regular inspection and cleaning can help you prevent starting problems and extend the life of your BG 65 Stihl blower.
6. Tip #5: Check the Kill Switch and Wiring
Sometimes, the problem isn’t with the ignition system itself, but with the kill switch or its associated wiring. A faulty kill switch can prevent the engine from starting, even if the ignition system is functioning correctly.
Step-by-Step Guide:
- Locate the Kill Switch: The kill switch is typically located on the handle of the BG 65 Stihl blower.
- Inspect the Kill Switch: Visually inspect the kill switch for signs of damage, such as cracks or broken wires.
- Test the Kill Switch: Use a multimeter to test the kill switch’s continuity. Set the multimeter to the continuity setting and measure the continuity between the kill switch terminals. When the switch is in the “on” position, there should be no continuity. When the switch is in the “off” position, there should be continuity. If the kill switch fails the continuity test, replace it with a new switch.
- Inspect the Wiring: Inspect the wiring that connects the kill switch to the ignition coil. Look for signs of damage, such as frayed wires, loose connections, or corrosion. Repair or replace any damaged wiring.
Personal Experience:
I once spent hours troubleshooting a BG 65 that wouldn’t start, only to discover that the kill switch wire had come loose. Reconnecting the wire solved the problem immediately. This experience taught me the importance of checking the simple things first.
Measurements and Specifications:
- Continuity Test: Use a multimeter to test the kill switch’s continuity.
- Wiring Inspection: Look for frayed wires, loose connections, and corrosion.
- Repair Supplies: Use electrical tape or wire connectors to repair damaged wiring.
Case Study:
A homeowner was experiencing intermittent starting problems with their BG 65 blower. After investigating, I found that the kill switch wire was rubbing against the engine casing, causing it to short out intermittently. Rerouting the wire and securing it with a zip tie resolved the problem and prevented future shorts.
Strategic Advantage:
Checking the kill switch and wiring is a simple but important step in troubleshooting starting problems. It can help you quickly identify and resolve issues that are preventing the engine from starting.
Additional Tips for Tough Starts
Beyond the five main tips, here are some additional considerations that can help you troubleshoot tough starts on your BG 65 Stihl blower:
- Fuel Quality: Old or contaminated fuel can prevent the engine from starting. Always use fresh, high-quality fuel and mix it with the correct ratio of two-stroke oil. I personally prefer using ethanol-free fuel whenever possible, as ethanol can absorb moisture and cause corrosion in small engines.
- Air Filter: A clogged air filter can restrict airflow and prevent the engine from starting. Clean or replace the air filter regularly.
- Carburetor: A dirty or clogged carburetor can also cause starting problems. If you suspect the carburetor is the issue, you may need to clean or rebuild it. This is a more complex task that may require professional assistance.
- Compression: Low compression can also prevent the engine from starting. You can check the compression using a compression tester. If the compression is low, the engine may need to be rebuilt.
- Proper Starting Procedure: Follow the manufacturer’s recommended starting procedure for the BG 65 Stihl blower. This typically involves priming the carburetor, setting the choke, and pulling the starter cord.
Personal Experience:
I once had a BG 65 that refused to start, even after cleaning the spark plug and checking the ignition coil. Finally, I decided to check the fuel. I discovered that the fuel tank was full of old, gummy fuel. After draining the tank and replacing the fuel with fresh fuel, the blower started on the first pull. This experience taught me the importance of using fresh fuel and storing fuel properly.
Measurements and Specifications:
- Fuel Ratio: Use the manufacturer’s recommended fuel-to-oil ratio.
- Air Filter Cleaning: Clean the air filter regularly with soap and water.
- Compression Test: Use a compression tester to check the engine’s compression.
Case Study:
A small engine repair shop was experiencing frequent starting problems with BG 65 blowers that had been stored for the winter. After investigating, I found that the carburetors were clogged with varnish from the old fuel. Implementing a fuel stabilizer program and advising customers to drain the fuel tanks before storing their blowers significantly reduced their carburetor problems.
Strategic Advantage:
Addressing these additional considerations can help you troubleshoot a wider range of starting problems and ensure that your BG 65 Stihl blower starts reliably every time.
Safety Considerations
When working on small engines, it’s essential to prioritize safety. Here are some important safety considerations to keep in mind:
- Disconnect the Spark Plug Boot: Always disconnect the spark plug boot before working on the ignition system to prevent accidental starting.
- Wear Safety Glasses: Wear safety glasses to protect your eyes from debris.
- Work in a Well-Ventilated Area: Work in a well-ventilated area to avoid inhaling fumes.
- Use Proper Tools: Use the correct tools for the job to prevent damage to the engine and injury to yourself.
- Follow Manufacturer’s Instructions: Always follow the manufacturer’s instructions for servicing and repairing the BG 65 Stihl blower.
- Handle Fuel Safely: Fuel is flammable and can be dangerous. Handle fuel safely and store it in a properly labeled container.
Personal Experience:
I always make sure to disconnect the spark plug boot before working on any small engine. I once accidentally started an engine while working on it, and it could have been very dangerous. This experience taught me the importance of taking safety precautions seriously.
Measurements and Specifications:
- Safety Glasses: Wear ANSI-approved safety glasses.
- Work Area Ventilation: Ensure adequate ventilation to avoid inhaling fumes.
- Fuel Storage: Store fuel in a properly labeled container in a cool, dry place.
Case Study:
Strategic Advantage:
Prioritizing safety is essential for preventing accidents and injuries. By following these safety considerations, you can work on your BG 65 Stihl blower safely and effectively.
Conclusion and Next Steps
Troubleshooting spark issues on a BG 65 Stihl blower can seem daunting, but by following these five pro tips and additional considerations, you can diagnose and resolve most starting problems. Remember to start with the simple things, like inspecting and cleaning the spark plug, and then move on to more complex components, like the ignition coil and flywheel.
Next Steps:
- Gather Your Tools: Collect the necessary tools, including a spark plug wrench, spark plug gap tool, wire brush, multimeter, feeler gauge, and cleaning supplies.
- Follow the Steps: Follow the step-by-step guides outlined in this article to troubleshoot the spark issue on your BG 65 Stihl blower.
- Consult the Manual: Refer to the manufacturer’s service manual for specific instructions and specifications for your BG 65 Stihl blower.
- Seek Professional Assistance: If you are unable to resolve the problem yourself, seek professional assistance from a qualified small engine mechanic.
By taking these steps, you can ensure that your BG 65 Stihl blower starts reliably and performs optimally, allowing you to tackle your yard work with confidence. Remember, consistent maintenance and proactive troubleshooting are key to keeping your equipment running smoothly for years to come.
