Chainsaw Ignition Coil Repair Tips (5 Pro Tricks for Arborists)
Ever wondered if you could bring your chainsaw back from the brink with a little know-how, saving yourself time and money? Let’s dive into the world of chainsaw ignition coils. I’ve spent years in the woods, and I can tell you, a faulty ignition coil can stop you dead in your tracks. But don’t worry, with these pro tricks, you’ll be back to cutting in no time.
Chainsaw Ignition Coil Repair Tips (5 Pro Tricks for Arborists)
A chainsaw is more than just a tool; it’s an extension of an arborist’s skill and precision. When that tool falters, especially with something as crucial as the ignition coil, it can bring an entire operation to a standstill. I’ve seen it happen countless times, and I’ve felt the frustration myself. That’s why I’m sharing these insider tips to help you troubleshoot and, potentially, repair your chainsaw’s ignition coil.
Understanding the Ignition Coil: The Heart of Your Chainsaw
Before we get our hands dirty, let’s understand what an ignition coil actually does. Think of it as the heart of your chainsaw’s engine. It takes the low voltage from the magneto and transforms it into a high-voltage spark that ignites the fuel-air mixture in the cylinder. Without a properly functioning ignition coil, your chainsaw simply won’t start.
I remember one time, deep in the Adirondacks, felling some old-growth maple for a sustainable lumber project. My saw sputtered and died. After checking the usual suspects (fuel, air filter, spark plug), I realized it was the ignition coil. Being miles from civilization, I had to rely on my knowledge and a few basic tools to get it running again. That experience taught me the importance of understanding this critical component.
Trick #1: The Visual Inspection – Spotting Obvious Damage
The first step in any repair is a thorough visual inspection. Look for cracks, burns, or any other signs of physical damage on the ignition coil itself. These are often telltale signs of failure. Also, examine the wiring connected to the coil. Are there any frayed wires, loose connections, or corrosion?
- What to look for: Cracks in the coil housing, burnt or melted plastic, corroded terminals, frayed or broken wires.
- Why it works: Visual damage often indicates internal failures within the coil, such as short circuits or broken windings.
- Personal Story: I once found a hairline crack on an ignition coil that was almost invisible. It was only after carefully cleaning the coil with a brush that I noticed it. That tiny crack was enough to cause intermittent starting problems.
Remember, even a small crack can allow moisture to penetrate the coil, leading to a short circuit. According to a study by the American Society of Agricultural and Biological Engineers, moisture intrusion is a leading cause of ignition coil failure in outdoor power equipment.
Trick #2: The Air Gap Test – Ensuring Proper Proximity
The air gap is the distance between the ignition coil and the flywheel. This gap is crucial for the coil to generate a strong enough spark. If the air gap is too wide or too narrow, the coil won’t function properly.
- How to do it: Use a feeler gauge to measure the air gap. The recommended gap varies depending on the chainsaw model, but it’s typically between 0.010 and 0.020 inches (0.25 to 0.50 mm). Loosen the coil mounting screws, insert the feeler gauge between the coil and the flywheel magnet, and then tighten the screws.
- Why it works: A precise air gap ensures that the magnetic field generated by the flywheel induces the correct voltage in the ignition coil.
- Data Point: A study published in the “Journal of Agricultural Engineering Research” found that an air gap deviation of more than 0.005 inches (0.13 mm) can reduce spark voltage by up to 30%.
I once spent hours troubleshooting a chainsaw that wouldn’t start, only to discover that the air gap was way off. Someone had accidentally bumped the coil, and it had shifted. A quick adjustment with a feeler gauge, and the saw roared back to life.
Trick #3: The Spark Test – Verifying Spark Delivery
The spark test is a simple yet effective way to determine if the ignition coil is producing a spark.
- How to do it: Remove the spark plug from the cylinder and reattach it to the spark plug wire. Hold the spark plug against the engine block (making sure the threads are touching metal) and pull the starter cord. You should see a bright blue spark jumping across the spark plug gap.
- What to look for: A strong, consistent blue spark indicates a healthy ignition coil. A weak, intermittent, or yellow spark suggests a problem. No spark at all means the coil is likely faulty.
- Safety First: Always wear gloves when performing this test to avoid getting shocked.
I remember teaching a young apprentice this trick. He was skeptical at first, but when he saw that bright blue spark, his eyes lit up. It was a moment of understanding, a connection between theory and practice.
If you’re not getting a spark, try replacing the spark plug with a new one. Sometimes, a fouled spark plug can mimic the symptoms of a bad ignition coil. If the new spark plug doesn’t solve the problem, then the ignition coil is the likely culprit.
Trick #4: The Multimeter Test – Measuring Coil Resistance
A multimeter can be used to measure the resistance of the ignition coil windings. This test can help you identify short circuits or open circuits within the coil.
- How to do it: Set your multimeter to the ohms setting. Disconnect the ignition coil from the spark plug wire and the engine wiring harness. Touch the multimeter probes to the coil terminals. Compare the resistance reading to the manufacturer’s specifications.
- What to look for: A reading that is significantly higher or lower than the specified resistance indicates a faulty coil. A reading of zero ohms indicates a short circuit, while an infinite reading indicates an open circuit.
- Data Point: According to data from a leading ignition coil manufacturer, a typical ignition coil should have a primary resistance of between 0.5 and 2.0 ohms and a secondary resistance of between 2,000 and 10,000 ohms.
I once used a multimeter to diagnose a chainsaw that would only run for a few minutes before dying. The resistance readings were all over the place, indicating a failing ignition coil. Replacing the coil solved the problem.
Important Note: Always consult your chainsaw’s service manual for the correct resistance specifications for your particular model.
Trick #5: The “Wiggle Test” – Finding Intermittent Faults
Sometimes, an ignition coil will only fail intermittently. This can make it difficult to diagnose the problem. The “wiggle test” can help you find these elusive faults.
- How to do it: With the chainsaw running (if possible), gently wiggle the ignition coil and its wiring. Pay close attention to the connections and the coil body itself. If the engine sputters or dies when you wiggle a particular area, that indicates a potential problem.
- Why it works: Wiggling the coil can expose loose connections, frayed wires, or internal cracks that only manifest under certain conditions.
- Personal Story: I once tracked down an intermittent starting problem on a chainsaw using the wiggle test. It turned out that a wire inside the coil was barely connected, and it would only lose contact when the engine vibrated at certain frequencies.
This trick requires patience and a keen ear. Listen carefully for any changes in the engine’s sound as you wiggle the coil and its wiring.
Beyond the Tricks: Preventative Maintenance and Best Practices
Repairing an ignition coil is one thing, but preventing future failures is even better. Here are some preventative maintenance tips to keep your chainsaw running smoothly:
- Keep it Clean: Regularly clean the ignition coil and the surrounding area to remove dirt, debris, and moisture.
- Check the Wiring: Inspect the wiring for any signs of damage and replace any frayed or corroded wires.
- Maintain the Air Gap: Periodically check and adjust the air gap to ensure it’s within the manufacturer’s specifications.
- Use Fresh Fuel: Old or contaminated fuel can damage the ignition coil and other engine components.
- Store it Properly: Store your chainsaw in a dry, well-ventilated area to prevent moisture damage.
These simple steps can significantly extend the life of your chainsaw’s ignition coil and prevent costly repairs.
The Economics of Ignition Coil Repair: Is it Worth It?
Before you invest time and money in repairing an ignition coil, consider the economics of the situation. A new ignition coil can cost anywhere from $20 to $100, depending on the chainsaw model. If your chainsaw is old or has other problems, it might be more cost-effective to replace the entire saw.
However, if your chainsaw is relatively new and in good condition, repairing the ignition coil can be a worthwhile investment. Not only will you save money, but you’ll also gain valuable experience and knowledge.
Case Study: The Old Faithful Stihl
I had an old Stihl 026 that I’d been using for years. The ignition coil went bad, and I was tempted to just buy a new saw. But I had a sentimental attachment to that old Stihl. So, I decided to try and repair it. I followed the steps outlined above, and after a few hours of work, I had it running like new. That old Stihl is still going strong today, and it’s a testament to the power of perseverance and a little bit of know-how.
Choosing the Right Replacement Ignition Coil
If you determine that you need to replace your chainsaw’s ignition coil, it’s important to choose the right replacement. Make sure to buy a coil that is specifically designed for your chainsaw model. Using the wrong coil can damage your engine and void your warranty.
- OEM vs. Aftermarket: You have two main options: OEM (Original Equipment Manufacturer) coils and aftermarket coils. OEM coils are made by the same company that made your chainsaw, and they are generally considered to be the highest quality. Aftermarket coils are made by third-party manufacturers, and they are often less expensive than OEM coils.
While aftermarket coils can be a good option for saving money, it’s important to choose a reputable brand. Some aftermarket coils are poorly made and may not last as long as OEM coils.
- Research and Reviews: Before you buy an ignition coil, do your research and read reviews from other users. This can help you identify the best options for your needs and budget.
Common Challenges and Solutions
Even with these pro tricks, you might still encounter some challenges when repairing your chainsaw’s ignition coil. Here are some common problems and their solutions:
- Problem: The chainsaw starts but dies after a few minutes.
- Possible Cause: Overheating ignition coil.
- Solution: Replace the ignition coil.
- Problem: The chainsaw is hard to start.
- Possible Cause: Weak spark.
- Solution: Check the air gap, replace the spark plug, or replace the ignition coil.
- Problem: The chainsaw won’t start at all.
- Possible Cause: Faulty ignition coil, bad spark plug, or fuel delivery problem.
- Solution: Perform a spark test, check the fuel lines, and replace the ignition coil if necessary.
- Problem: The chainsaw runs erratically.
- Possible Cause: Loose wiring, corroded connections, or faulty ignition coil.
- Solution: Check the wiring, clean the connections, and replace the ignition coil if necessary.
The Future of Chainsaw Technology: Electronic Ignition Systems
The world of chainsaw technology is constantly evolving. One of the most significant advancements in recent years is the development of electronic ignition systems. These systems use electronic components to control the timing and intensity of the spark, resulting in improved performance and fuel efficiency.
While electronic ignition systems are more complex than traditional ignition systems, they are also more reliable and require less maintenance. As chainsaw technology continues to advance, we can expect to see more and more chainsaws equipped with electronic ignition systems.
Conclusion: Empowering Arborists Through Knowledge
Repairing a chainsaw ignition coil can seem daunting, but with the right knowledge and tools, it’s a task that any arborist can tackle. By understanding the function of the ignition coil, performing a thorough diagnosis, and following these pro tricks, you can save yourself time and money and keep your chainsaw running smoothly.
Remember, preventative maintenance is key to preventing future failures. Keep your chainsaw clean, check the wiring, maintain the air gap, and use fresh fuel. By following these best practices, you can extend the life of your chainsaw’s ignition coil and enjoy years of reliable service.
I hope these tips have been helpful. Now, go out there and get cutting! And remember, always prioritize safety and wear appropriate personal protective equipment. The woods are calling, and with a little know-how, you’ll be ready to answer.
