USA Motorcycling

You might not realize that the right spark plugs can make a noticeable difference in your Harley Street Glide's performance and efficiency. Choosing the best options isn't just about brand preference; it involves understanding how they impact throttle response and fuel consumption. With several high-quality choices available, knowing which ones truly stand out can be essential for optimizing your ride. So, what are the top spark plugs that can elevate your experience on the open road?

Quick Takeaways

• NGK Iridium IX spark plugs offer improved power and easier starts, perfect for Harley Davidson Twin Cam models (1999-2016).
• The NGK (6046) DCPR7EIX enhances throttle response and can boost fuel economy by 2 MPG, lasting up to 45,000 miles.
• NGK's four-pack of iridium spark plugs ensures quality and easy installation, suitable for DIY enthusiasts with a strong customer rating.
• Spark plug wires designed for 2009-2015 Harley models feature high-temperature resistance and a perfect 5.0-star rating for reliability.
• Regular inspection and maintenance of spark plugs can significantly enhance engine performance and longevity, ensuring optimal ride quality.

NGK Iridium IX Spark Plugs for Harley Davidson Twin Cam (Pair)

The NGK Iridium IX Spark Plugs are an excellent choice for Harley Davidson Twin Cam owners looking to enhance their motorcycle's performance. Designed specifically for models from 1999 to 2016, these plugs can provide a power increase of up to 3HP. Their ultra-small iridium electrode, which is 25% smaller than platinum and a quarter of conventional nickel electrodes, reduces the voltage requirement, leading to a longer-lasting ignition system. With enhanced anticorrosion qualities and pre-gapped for convenience, the DCPR7EIX model stands out in customer reviews, boasting an impressive 4.7 out of 5 stars. Riders report smoother operation and easier starts, making these spark plugs a popular choice for various Harley models, including the Road King and Sportster.

Best For: Harley Davidson Twin Cam owners seeking improved engine performance and reliability in their motorcycles.

Pros:

• Enhanced performance with up to 3HP increase.
• Longer ignition system life due to reduced voltage requirements.
• Positive customer feedback highlighting smoother starts and operation.

Cons:

• Some users may need to check and adjust the gap before installation.
• Price may be higher compared to conventional spark plugs.
• Compatibility limited to specific Harley models from 1999 to 2016.

Spark Plug Wires for Harley H-D FLT FLHT FLHR FLTR (2009-2015)

For Harley enthusiasts with the H-D FLT, FLHT, FLHR, and FLTR models from 2009 to 2015, the Spark Plug Wires compatible with these bikes stand out due to their robust construction and high-temperature resistance. Made from a spiral alloy conductor and high dielectric insulator, these wires feature a 10mm thick silicone jacket, ensuring durability and performance. The tear-proof and weatherproof design makes them ideal for various riding conditions. Installation is straightforward, requiring no modifications, and the package includes two pre-cut red wires—one 20-inch and one 32-inch—plus plastic ties for convenience. With a perfect 5.0-star rating and a 30-day return guarantee, these spark plug wires offer both quality and reliability for the dedicated rider.

Best For: Harley riders looking for high-quality spark plug wires compatible with H-D FLT, FLHT, FLHR, and FLTR models from 2009 to 2015.

Pros:

• Durable construction with high-temperature resistance.
• Easy installation with no modifications required.
• Excellent customer ratings, reflecting reliability and satisfaction.

Cons:

• Limited compatibility outside the specified Harley models.
• Only available in one color (red).
• May not be suitable for riders seeking a more customized look.

NGK (6046) DCPR7EIX Iridium IX Spark Plug, Pack of 1

Engine performance enthusiasts seeking enhanced ignitability and responsiveness will find the NGK (6046) DCPR7EIX Iridium IX Spark Plug to be an ideal choice for their Harley Street Glide. This spark plug features a fine Iridium tip, designed for durability and extreme ignitability, ensuring improved throttle response. With its tapered ground electrode and triple gasket seal, it minimizes combustion gas leakage and enhances performance. Users report noticeable horsepower increases and an average fuel economy boost of 2 miles per gallon. The NGK DCPR7EIX can last up to 45,000 miles without performance degradation, even in high-temperature conditions. With a customer rating of 4.4 stars, it's a trusted option for riders looking to optimize their motorcycle's performance.

Best For: Engine performance enthusiasts looking to enhance ignitability and throttle response in their Harley Street Glide.

Pros:

• High durability with a laser-welded fine Iridium tip, resistant to heat and electrical wear.
• Improved performance with noticeable horsepower increases and an average fuel economy boost of 2 miles per gallon.
• Long lifespan, lasting up to 45,000 miles without performance degradation.

Cons:

• Requires proper gap setting for optimal performance, which may be challenging for some users.
• Higher initial cost compared to standard spark plugs, which may deter budget-conscious buyers.
• Limited to specific vehicles, requiring users to ensure compatibility with their motorcycle model.

NGK Iridium Spark Plugs for Harley-Davidson Twin Cam and XL (4 PCS)

Designed specifically for Harley-Davidson Twin Cam and XL models, NGK Iridium Spark Plugs offer enthusiasts exceptional performance and reliability. This set includes four NGK #6046 Iridium spark plugs, now superseded by the NGK 97637, ensuring premium quality from the world's largest supplier of OEM spark plugs. With an impressive average rating of 4.6 out of 5 stars from 191 customer reviews, these spark plugs rank #50,697 in Automotive and #336 in Automotive Replacement Spark Plugs. Users praise their reliable performance and easy installation, although they recommend careful handling due to the delicate electrode. With a 30-day return guarantee through Amazon, buyers can confidently enhance their ride's performance with these trusted spark plugs.

Best For: Harley-Davidson enthusiasts seeking reliable and high-performance spark plugs for Twin Cam and XL models.

Pros:

• High-quality iridium construction ensures long-lasting performance and durability.
• Easy installation reported by users, making it accessible for DIY mechanics.
• Highly rated with an average of 4.6 out of 5 stars, reflecting customer satisfaction.

Cons:

• Delicate electrode requires careful handling during installation to avoid damage.
• Superseded model may cause confusion for those looking for the original part number.
• Higher price point compared to standard spark plugs may not fit all budgets.

Americruise Finned Slotted Spark Plug Head Bolt Covers for Harley Touring

Harley enthusiasts consistently seek ways to enhance both performance and aesthetics, and the Americruise Finned Slotted Spark Plug Head Bolt Covers are an excellent choice for owners of Harley Touring models, including the Electra Glide, Road Glide, and Street Glide from 1999 to 2014. Crafted from high-quality aluminum with a chrome surface treatment, these black covers not only protect spark plug heads from dust and debris but also elevate the engine's overall appearance. Weighing 8.6 ounces and measuring 5.9 x 3.9 x 2.3 inches, they fit seamlessly without interfering with spark plug access. Installation is straightforward, thanks to the included bolts. With a solid average rating of 4.2 stars, these covers are a popular addition among Harley aficionados.

Best For: Harley Touring model owners looking to enhance their motorcycle's aesthetics while protecting spark plug heads.

Pros:

• Easy installation with included bolts and no interference with spark plug access.
• High-quality aluminum construction with a stylish chrome finish that improves engine appearance.
• Provides protection against dust, dirt, and debris, extending the life of spark plug heads.

Cons:

• Limited fitment for specific Harley models (1999-2014).
• Average customer rating may indicate mixed user experiences.
• May not significantly impact engine performance, as the primary function is aesthetic.

Factors to Consider When Choosing Spark Plugs for Harley Street Glide

When choosing spark plugs for your Harley Street Glide, you need to contemplate several key factors. You'll want to pay attention to the spark plug type, heat range selection, and electrode material benefits. Additionally, gap specifications and installation ease can greatly impact your bike's performance and maintenance experience.

Spark Plug Type

Choosing the right spark plug type for your Street Glide can greatly impact your bike's performance and longevity. You typically have three main options: copper, platinum, and iridium. Iridium plugs stand out due to their high melting point and durability, offering superior longevity and performance compared to the others.

When selecting a spark plug, pay attention to the electrode design. Smaller center electrodes can reduce voltage requirements, enhance ignitability, and improve your engine's performance and fuel efficiency. Pre-gapped plugs are convenient, but always verify that the gap size aligns with your manufacturer's specifications, generally between 0.038 to 0.040 inches for Harley models.

Another important factor is corrosion resistance. Opt for spark plugs with advanced coatings, like trivalent metal plating, to help prevent seizing and extend their lifespan, especially in harsh riding conditions.

Heat Range Selection

Selecting the right heat range for your spark plugs is crucial for maintaining your Harley Street Glide's performance and longevity. The heat range directly impacts the spark plug's ability to dissipate heat effectively. If your plugs run too hot, you risk pre-ignition and damaging your engine. On the flip side, if they run too cold, you may experience fouling and misfires, which can seriously affect ride quality.

Each engine has specific heat range requirements based on its design and operating conditions, often outlined in the manufacturer's specifications. For high-performance applications, a spark plug with a higher heat range works best, as it can handle elevated temperatures. Conversely, a lower heat range is more suitable for standard use.

It's crucial to match the heat range of your spark plugs with your engine's operating temperature to guarantee peak performance, fuel efficiency, and longevity. If you've made modifications to your engine, such as increasing compression or upgrading performance parts, you may need to adjust the heat range to accommodate the changes in thermal dynamics within the combustion chamber. Always consult your owner's manual or a professional for guidance on the appropriate heat range for your specific setup.

Electrode Material Benefits

The material of spark plug electrodes plays a significant role in performance and reliability for your Harley Street Glide. When you consider upgrading your spark plugs, iridium electrodes should be at the top of your list. They offer exceptional durability due to their high melting point and resistance to wear, which means you can go longer between replacements.

One of the standout features of iridium spark plugs is their ultra-small center electrode. This design requires less voltage to create a spark, leading to improved ignition efficiency and better throttle response. Many riders report gains in horsepower—up to 3HP—compared to conventional plugs, enhancing your overall ride experience.

Additionally, the tapered ground electrode design in iridium plugs minimizes electrical quenching, which allows for a more stable and efficient combustion process. You'll also appreciate that iridium plugs often come pre-gapped, making installation a breeze. This means you can enjoy a smoother-running engine right out of the box. By opting for iridium spark plugs, you're investing in performance and longevity, ensuring your Harley Street Glide runs at its best for miles to come.

Gap Specifications

Getting the spark plug gap right is important for maximizing your Harley Street Glide's performance. For Harley Davidson Twin Cam models, the recommended gap typically ranges from 0.038 to 0.040 inches. Proper gap settings play a significant role in ignition efficiency, engine performance, and fuel economy.

While spark plugs may come pre-gapped, it's a good idea to verify and adjust the gap according to the manufacturer's specifications before you install them. A gap that's too wide can lead to misfires and increased voltage requirements, which can negatively affect your ride. On the other hand, a gap that's too narrow can cause poor ignition and result in engine roughness.

To guarantee peak performance, regularly checking and maintaining the spark plug gap is crucial. This practice not only prolongs the life of your spark plugs but also enhances overall engine responsiveness. By paying attention to these specifications, you can enjoy a smoother, more efficient ride on your Harley Street Glide, making every journey more enjoyable and powerful.

Installation Ease

Often overlooked, the ease of installation plays an essential role when you're choosing spark plugs for your Harley Street Glide. Look for spark plugs that come with pre-gapped electrodes and are designed for direct replacement. This way, you'll minimize any modifications and make the installation process smoother.

Many spark plugs include specific installation instructions, making it easier for you, even if you have limited mechanical experience. Selecting spark plugs made from durable materials can also simplify installation, as they're less likely to get damaged during handling. Some models even feature tapered ground electrodes, which not only enhance performance but also keep the installation straightforward.

Before making your choice, it's advisable to check customer reviews. You'll find valuable insights from fellow riders who have experience installing specific spark plugs on their Harley Street Glide models. This feedback can guide you toward products that are user-friendly and reliable. By prioritizing ease of installation, you'll save time and effort while ensuring that your spark plugs fit perfectly and perform well.

Performance Improvement

When it comes to boosting your Harley Street Glide's performance, choosing the right spark plugs can make a significant difference. Upgrading to iridium spark plugs can add up to 3 horsepower, enhancing your engine's overall performance. The ultra-small center electrode of iridium plugs lowers the voltage requirement, which improves ignition efficiency and throttle response, giving you a more responsive ride.

Fuel economy is another vital factor. Users frequently report an average improvement of about 2 miles per gallon after switching to high-performance spark plugs. This means not only are you enhancing your bike's power, but you're also getting more out of every gallon of fuel.

To maximize the effectiveness of your spark plugs, pay attention to the proper gap setting, typically between 0.038 to 0.040 inches. This detail is essential for achieving peak engine performance. Investing in high-quality spark plugs can also guarantee they last up to 45,000 miles, providing long-lasting performance without a decline in efficiency. By selecting the right spark plugs, you'll not only enhance your ride's performance but also enjoy a more powerful and economical experience on the road.

Longevity and Durability

Choosing the right spark plugs for your Harley Street Glide is essential for ensuring longevity and durability. Opt for spark plugs made from iridium, as they can last up to 45,000 miles without performance degradation. Their high melting point and resistance to heat and electrical wear make them an excellent choice for your ride.

Look for plugs with a fine iridium tip design, which enhances durability and ignitability. This feature contributes to improved throttle response and overall engine performance. Additionally, high-quality spark plugs often have advanced coatings like trivalent metal plating to combat corrosion and seizing, further extending their lifespan.

Consider a tapered ground electrode design as well; it can reduce electrical quenching and enhance durability, especially under high-stress conditions. Remember, proper gap setting is vital. Incorrect gaps can lead to premature wear and reduce the longevity of your spark plugs.

Common Questions

How Often Should I Replace My Harley Street Glide Spark Plugs?

You should replace your Harley Street Glide spark plugs every 10,000 to 15,000 miles, but it's a good idea to check them regularly. If you notice poor performance, rough idling, or decreased fuel efficiency, it might be time for a change even sooner. Keeping an eye on their condition helps guarantee your bike runs smoothly and efficiently. Don't forget to consult your owner's manual for specific recommendations based on your model!

Can I Use Different Brands of Spark Plugs for My Harley?

You might think any spark plug can work for your Harley, but that's not always true. While you can technically use different brands, it's essential to choose plugs that meet your bike's specifications. Each brand has unique designs and materials that affect performance and longevity. To guarantee ideal engine function, stick to trusted brands that suit your model, and always check your owner's manual for recommendations. Your ride deserves the best!

What Tools Are Needed to Change Spark Plugs on a Harley?

To change spark plugs on your Harley, you'll need a few essential tools. Grab a ratchet with the appropriate spark plug socket, an extension, and a torque wrench for proper tightening. You might also want a gapping tool to guarantee the spark plugs are set correctly. Don't forget gloves to keep your hands clean and a clean cloth to wipe any debris from the area. With these tools, you're ready to tackle the job!

Will Upgraded Spark Plugs Improve Fuel Efficiency?

Upgraded spark plugs can indeed improve your bike's fuel efficiency. Imagine cruising down the highway, feeling the smooth power of your engine as it runs more efficiently. When you swap out your old plugs for better ones, you create a more complete combustion process. That means your engine uses fuel more effectively, leading to better mileage. So, if you want to stretch your tank and enjoy the ride longer, consider upgrading your spark plugs!

Is It Safe to Change Spark Plugs Myself?

Yes, it's generally safe to change spark plugs yourself if you've got the right tools and some basic mechanical knowledge. Just make sure to double-check your vehicle's manual for specific instructions and torque specifications. Take your time, and don't rush the process. If you encounter any unusual issues or feel unsure, it's always wise to consult a professional mechanic. Remember, proper installation is key to keeping your engine running smoothly.

Wrapping Up

In summary, upgrading your Harley Street Glide with high-quality spark plugs can truly elevate your ride's performance and efficiency. While some might worry about the cost, investing in premium plugs like the NGK Iridium IX will pay off in the long run through improved fuel economy and engine reliability. Don't underestimate the impact of a simple spark plug change; it's a small upgrade that can lead to a considerable smoother and more enjoyable ride.