Your Harley Street Glide is a beast of a machine, a symbol of freedom and power on the open road. But even the most formidable engines need regular maintenance to keep them running smoothly. One often-overlooked but crucial aspect of engine health is the condition of your spark plug wires. These unsung heroes deliver the high-voltage spark that ignites the fuel-air mixture in your cylinders, directly impacting your bike’s performance, fuel efficiency, and overall reliability. Ignoring worn-out or damaged spark plug wires can lead to a host of problems, from misfires and reduced power to engine damage.
Fortunately, replacing spark plug wires on a Harley Street Glide is a relatively straightforward task that most DIY mechanics can tackle with the right tools and a little patience. This comprehensive guide will walk you through the entire process, from identifying worn wires to safely installing new ones. By mastering this essential maintenance procedure, you’ll not only keep your Street Glide running like a dream but also save yourself money on costly repairs down the road.
Identifying Worn Spark Plug Wires
Before diving into the replacement process, it’s essential to correctly identify worn spark plug wires. Over time, these wires can deteriorate due to exposure to heat, vibration, and engine oil. Look out for the following signs:
Signs of Wear
- Cracks or Cuts: Inspect the wire insulation for any visible cracks, cuts, or fraying. These can expose the internal copper core, leading to electrical shorts and misfires.
- Oil Soaking: Check for oil residue or discoloration on the wire insulation. This indicates potential oil leaks or improper sealing, which can damage the wires and compromise performance.
- Corrosion: Look for signs of corrosion on the wire terminals, especially where they connect to the spark plugs and the ignition coil. Corrosion can hinder spark delivery and cause misfires.
- Loss of Elasticity: Gently squeeze the wire insulation. If it feels stiff, brittle, or cracked, it’s likely time for replacement.
Spark Test
A simple spark test can help determine if your spark plug wires are functioning correctly. Disconnect the spark plug wire from the spark plug, attach a spark plug tester to the wire end, and crank the engine. If you see a strong, blue spark jumping across the tester gap, the wire is likely good. A weak, intermittent, or no spark indicates a faulty wire.
Tools and Materials Needed
Before you begin, gather the necessary tools and materials to ensure a smooth and successful replacement process:
| Tool | Description |
| Socket Wrench Set | To remove and install spark plugs and ignition coils |
| Spark Plug Gap Gauge | To ensure proper gap between spark plug electrodes |
| Wire Strippers | To remove insulation from wire ends if needed |
| Torque Wrench | To tighten spark plugs and ignition coils to the correct specifications |
| Rags or Shop Towels | To clean up any spills or debris |
Materials
- New Spark Plug Wires: Ensure you purchase wires specifically designed for your Harley Street Glide model and engine type.
- Spark Plug Anti-Seize Compound: Apply a thin layer to the spark plug threads to prevent galling and ensure easy removal in the future.
Step-by-Step Replacement Guide
Now that you’re equipped with the knowledge and tools, let’s proceed with the step-by-step replacement process:
1. Disconnect the Battery
Safety first! Always disconnect the negative (-) battery terminal before working on any electrical components. This prevents accidental shorts and potential injury.
2. Locate the Spark Plug Wires
The spark plug wires are typically routed from the ignition coils to the spark plugs. Refer to your Harley Street Glide’s service manual for the exact routing and identification of each wire. (See Also: Why Do Spark Plugs Fail? Uncovered)
3. Remove the Ignition Coils
Using a socket wrench, carefully remove the ignition coils from the cylinder heads. Note the order in which you remove them for proper reinstallation.
4. Disconnect the Spark Plug Wires
Gently pull the spark plug wires off the spark plugs. Be careful not to touch the exposed spark plug electrodes with your hands or any metal objects, as this can contaminate the spark plug and affect performance.
5. Install the New Spark Plug Wires
Connect the new spark plug wires to the spark plugs, ensuring they are securely seated. Pay attention to the wire routing and order to match the original setup.
6. Install the Ignition Coils
Carefully reinstall the ignition coils onto the cylinder heads and tighten them to the manufacturer’s specified torque. Use a torque wrench to ensure proper tightening.
7. Reconnect the Battery
Reconnect the negative (-) battery terminal. Double-check all connections to ensure they are secure.
8. Start the Engine and Check for Misfires
Start your Harley Street Glide and let it idle for a few minutes. Listen for any unusual noises or misfires. If everything sounds normal, you’ve successfully replaced your spark plug wires.
Additional Tips and Considerations
Here are some additional tips to keep in mind when replacing spark plug wires on your Harley Street Glide:
* **Consult your service manual:** Always refer to your Harley Street Glide’s service manual for specific torque specifications, wire routing diagrams, and other important information. (See Also: Do All Cars Take The Same Spark Plugs? Not Always)
* **Use high-quality wires:** Invest in high-quality spark plug wires from a reputable brand to ensure optimal performance and longevity.
* **Inspect the spark plugs:** While you have the spark plugs exposed, inspect them for wear and tear. Replace them if necessary.
* **Clean the engine bay:** Take the opportunity to clean up any dirt or debris in the engine bay while you’re working.
* **Double-check all connections:** Before starting the engine, double-check all spark plug wire connections to ensure they are secure and properly seated.
Summary
Replacing spark plug wires on your Harley Street Glide is a crucial maintenance task that can significantly impact your bike’s performance, fuel efficiency, and overall reliability. By following the step-by-step guide outlined in this article, you can confidently tackle this DIY project and keep your Street Glide running smoothly. Remember to always prioritize safety, consult your service manual, and use high-quality parts for optimal results.
Regularly inspecting and replacing your spark plug wires is a simple yet effective way to ensure your Harley Street Glide continues to deliver the exhilarating ride you expect. By staying proactive with maintenance, you’ll not only extend the life of your engine but also enjoy countless miles of trouble-free riding.
Frequently Asked Questions
How often should I replace my spark plug wires?
Generally, spark plug wires should be inspected annually or every 15,000-20,000 miles, whichever comes first. However, factors like riding conditions, engine type, and wire quality can influence their lifespan. Always refer to your Harley Street Glide’s service manual for specific recommendations. (See Also: How to Increase Spark Plug Gap? Unleash Engine Power)
Can I reuse old spark plug wires?
It’s not recommended to reuse old spark plug wires, especially if they show signs of wear, damage, or corrosion. Using worn wires can lead to misfires, reduced performance, and potential engine damage.
What are the symptoms of bad spark plug wires?
Common symptoms of bad spark plug wires include: difficulty starting, rough idling, engine misfires, reduced acceleration, and decreased fuel efficiency. If you experience any of these symptoms, inspect your spark plug wires for signs of damage or wear.
Can I replace spark plug wires myself?
Yes, replacing spark plug wires on a Harley Street Glide is a relatively straightforward DIY task that most mechanically inclined individuals can handle. This guide provides a step-by-step walkthrough to assist you.
What type of spark plug wires do I need for my Harley Street Glide?
Ensure you purchase spark plug wires specifically designed for your Harley Street Glide model and engine type. Refer to your service manual or consult a reputable motorcycle parts supplier for the correct specifications.