Best Spark Plugs for Harley-Davidson Motorcycles – Information and Reviews

Spark plugs, often overlooked and underestimated, play a vital role in the performance of your beloved Harley-Davidson motorcycle. While they may seem small and relatively inexpensive, their significance cannot be overstated. A faulty spark plug can turn your once exhilarating ride into a distressing experience, with a misfiring engine plaguing your journey home. Thankfully, replacing spark plugs on your Harley-Davidson is not only an affordable endeavor but also opens up a world of possibilities with the plethora of aftermarket options available.

Let us delve into the primary function of a spark plug, for it is through this small yet crucial component that the combustion process ignites within the engine. By generating an electric spark, the spark plug initiates the combustion of the air-fuel mixture, propelling your Harley-Davidson forward with power and precision. As you contemplate the need for spark plug replacement, it is essential to consider the diverse array of aftermarket options at your disposal.

While the original equipment spark plugs provided by Harley-Davidson are undoubtedly reliable, the aftermarket market offers an assortment of spark plug variations that may pique your interest. These aftermarket spark plugs often boast improved features and enhanced performance capabilities, promising to take your riding experience to the next level. From advanced electrode designs to specialized materials, aftermarket spark plugs present an opportunity to optimize the combustion process and unlock the true potential of your Harley-Davidson.

Now, you might wonder why replacing spark plugs is necessary in the first place. Over time, spark plugs endure wear and tear, leading to diminished performance and efficiency. Factors such as engine heat, fuel quality, and riding conditions can impact the lifespan of spark plugs, making periodic replacement a wise decision. By swapping out your worn-out spark plugs with fresh ones, you ensure consistent ignition, smoother acceleration, and optimal fuel economy, all while preserving the longevity of your cherished Harley-Davidson motorcycle.

When venturing into the realm of aftermarket replacement spark plugs, it’s crucial to consider your specific needs and riding preferences. The diverse range of available options can be overwhelming, but fear not, for we shall explore some notable alternatives. Whether you prioritize longevity, improved combustion efficiency, or heightened performance, there is a spark plug out there tailored to meet your desires. From iridium and platinum electrodes to multi-ground and extended reach designs, the aftermarket market caters to every discerning rider seeking to enhance their Harley-Davidson’s ignition system.

In conclusion, do not underestimate the impact of spark plugs on your Harley-Davidson’s performance. These seemingly insignificant components wield immense power, influencing the very heart of your motorcycle’s engine. Embrace the opportunity to replace your spark plugs with aftermarket alternatives that align with your riding aspirations. By doing so, you not only ensure a smooth and exhilarating journey but also unlock the untapped potential of your Harley-Davidson, taking your riding experience to unprecedented heights.

When and why to replace spark plugs?

When it comes to Harley-Davidson motorcycles, the reasons for spark plug replacement are diverse and encompass various factors that every Harley enthusiast should consider. One of the most common motives for replacing spark plugs revolves around adhering to regular maintenance cycles. Typically, it is recommended to replace spark plugs every 10,000 miles, although this interval may vary depending on the specific year and model of your beloved Harley-Davidson.

Even if your spark plug has not reached the recommended mileage frequency, it is still prudent to inspect it periodically to ensure it is functioning optimally and doesn’t require replacement. Over time, spark plugs may show signs of aging, which can affect their performance. By examining the plug, you can preempt any potential issues and guarantee the smooth operation of your motorcycle’s engine.


Another compelling reason for replacing spark plugs is the occurrence of fouling, which can lead to misfires in the engine. When a spark plug becomes fouled, it fails to ignite the air and fuel mixture within the cylinder, resulting in a disrupted rhythm of the engine. This misfire is often accompanied by temporary irregular idling and, at times, noticeable backfiring or loud popping noises emanating from the exhaust. These symptoms occur due to the engine running too rich with fuel during the misfire. Additionally, starting the motorcycle may become challenging, with the initial ignition requiring extra effort and being accompanied by the smell of gasoline.

Moreover, advancements in spark plug technology present another motivating factor for their replacement. With the emergence of innovative materials and designs, options such as the patented E3 spark plugs have gained popularity among Harley-Davidson riders. While the debate regarding the superiority of one brand over another in terms of fuel efficiency and performance enhancements remains ongoing, the consensus suggests that a fresh set of high-quality spark plugs can potentially yield a few extra horsepower, especially if the current plugs in your engine are nearing the end of their service life.

In conclusion, the decision to replace spark plugs in your Harley-Davidson should be based on several factors, including adherence to regular maintenance cycles, detection of fouling and misfires, and the availability of improved spark plug technology. By staying proactive in maintaining your motorcycle’s spark plugs, you can ensure optimal engine performance, enhanced fuel efficiency, and an overall enjoyable riding experience on your iconic Harley-Davidson machine.

What spark plug replacement options are out there?

When it comes to spark plugs for your beloved Harley-Davidson motorcycle, there is a world of aftermarket options to explore. In this comprehensive analysis, we will delve into the details of these alternative spark plugs, providing you with valuable insights and even a handy table to facilitate your decision-making process. However, before we embark on this journey, it is crucial to emphasize the importance of checking the fitment, gap, and compatibility of any spark plug with your specific engine before making a purchase.

Unlike the notion of a one-size-fits-all spark plug, these indispensable components are meticulously designed to meet the diverse requirements of various motor specifications. Spark plugs are manufactured with slightly different thread and reach dimensions to ensure a perfect fit for different engines. Furthermore, while certain spark plug replacements may come pre-gapped to match your motor’s exact specifications, it is always prudent to cross-verify the gap against the information provided in your owner’s manual, making necessary adjustments if required.

Now, let’s explore the benchmark options offered by Harley-Davidson themselves. The renowned motorcycle manufacturer presents three distinctive OEM spark plug replacement choices: the OE spark plug, the Gold edition copper-core spark plug, and the Screamin’ Eagle double-platinum coating performance spark plug. These genuine Harley-Davidson plugs can be conveniently obtained through your local dealership’s parts department if you prefer to stick with strict OEM replacements. However, this selection of three tiers provides us with valuable insights into the range of types and materials available. The top-tier option features platinum, while the Gold edition plug showcases the prominence of iridium (interestingly, Harley-Davidson’s website does not specify the composition of the base OE replacement).

Now that we have explored the OEM offerings, let us venture into the realm of aftermarket alternatives to Harley-Davidson’s stock spark plugs. This exciting journey will shed light on various features, benefits, and potential drawbacks of each option. To assist you in comparing these alternatives, we have included a convenient product chart at the end of this section. This chart will allow you to analyze the different spark plug options based on electrode material, thread/fitment compatibility, and unique distinguishing features of each product.

In conclusion, as an expert in the world of Harley-Davidson motorcycles, I highly encourage you to consider the diverse array of aftermarket spark plug options available. By doing so, you can tailor your choice to suit your specific motor’s needs, performance requirements, and personal preferences. Remember to conduct thorough research, consult your owner’s manual, and utilize the provided table to make an informed decision. Enjoy the exhilarating process of finding the perfect spark plug that will ignite the passion and power of your Harley-Davidson ride.


The E3 spark plugs embody the core principles of Energy, Efficiency, and Ecology, showcasing an exceptional fusion of cutting-edge technology and an innovative ground electrode design. These remarkable copper electrode spark plugs, fortified with patented advancements, hold the promise of elevating your Harley-Davidson motorcycle experience to new heights.

According to the esteemed manufacturer, these exceptional spark plugs have been meticulously engineered to deliver tangible benefits. By incorporating their unique design and advanced technology, the company claims that these plugs can potentially unleash a notable increase in power output, ranging from an impressive 6% to a staggering 12%. Imagine the exhilarating acceleration and enhanced performance that awaits you on the open road.

In addition to the power boost, these E3 spark plugs also aim to optimize fuel economy, providing riders with the added advantage of increased efficiency. With potential fuel savings ranging from 4% to an impressive 13%, these plugs offer the opportunity to stretch your riding adventures further while minimizing stops for refueling. You’ll not only experience the thrill of the ride but also enjoy the satisfaction of knowing that you’re contributing to a greener and more sustainable future.

Emissions reduction is a crucial aspect of modern motorcycling, and the E3 spark plugs have not overlooked this critical factor. By harnessing the power of their patented technology and innovative design, these plugs aspire to curtail emissions, playing their part in protecting the environment. As regulations and environmental awareness continue to evolve, the E3 spark plugs position themselves as a conscious choice for riders who prioritize sustainability and reducing their carbon footprint.

Designed with convenience in mind, these particular spark plugs are available in a 14mm thread, ensuring a hassle-free installation process. While it is always prudent to verify compatibility with your specific motor, the listing indicates compatibility with Shovelhead and Evolution motors (pre-1999), catering to a wide range of Harley-Davidson enthusiasts. Their versatility and suitability for these engines make them an enticing option for riders seeking enhanced performance and efficiency.

Considering their impressive features and benefits, the current discounted price of $6.49 USD per plug represents an exceptional value. With a generous 45% reduction from the regular list price of $11.71, these spark plugs offer an accessible opportunity to upgrade your Harley-Davidson at a fraction of the cost. However, it is worth noting that if budget constraints are not a primary concern, there may be alternative options available for your specific engine that warrant further exploration. Traditional yet reliable choices can offer their own unique advantages and merits, tailored to suit your individual riding preferences and requirements.

In conclusion, the E3 spark plugs epitomize a harmonious blend of technological prowess, efficiency, and environmental consciousness. By investing in these exceptional spark plugs, you have the potential to unlock increased power, optimize fuel economy, and contribute to a greener future. While their compatibility with Shovelhead and Evolution motors makes them an appealing choice, it is always prudent to research and evaluate various options to ensure the perfect fit for your Harley-Davidson motorcycle.


The Champion copper-core electrode spark plug showcases the exceptional craftsmanship and expertise of a renowned brand that has been dominating the motorsports parts industry for well over a century. With an affordable price tag of just $8.98 USD per individual spark plug, this product offers unrivaled value to consumers.

One of the standout features of the RA8HC plug is its remarkable anti-corrosive properties, ensuring longevity and optimal performance. Designed with a 12mm thread size, this spark plug is specifically tailored to suit twin cam motors produced between 1999 and 2017, as well as the iconic Sportster line dating back to 1986. Such compatibility makes it an ideal choice for Harley-Davidson enthusiasts seeking a like-kind/quality replacement for their OEM spark plugs.

While the Champion copper-core electrode spark plug already stands as a superb option, it’s worth considering the possibility of investing a few additional dollars to upgrade to an iridium plug. By making this slight financial leap, riders can potentially unlock even greater benefits and enhanced performance for their beloved Harley-Davidson motorcycles.

Iridium spark plugs, known for their superior conductivity and durability, offer several advantages over their copper counterparts. With a fine-wire center electrode made of iridium, these plugs facilitate a more efficient combustion process, resulting in improved fuel efficiency and power output. Additionally, iridium plugs have a longer lifespan, requiring less frequent replacement and providing long-term cost savings.

For Harley-Davidson riders who demand the utmost performance and are passionate about optimizing their riding experience, upgrading to an iridium spark plug can be a worthwhile investment. While the Champion copper-core electrode spark plug serves as an excellent choice for most riders, those seeking to push their motorcycles to the limits may find the additional benefits of an iridium plug well worth the modest increase in cost.

In conclusion, the Champion copper-core electrode spark plug embodies the legacy of a brand with a rich history in motorsports, offering exceptional quality and affordability. Its compatibility with a wide range of Harley-Davidson models, along with its anti-corrosive properties, makes it a highly desirable option for riders seeking a reliable replacement for their OEM spark plugs. However, for those looking to elevate their motorcycle’s performance to new heights, considering the advantages of upgrading to an iridium plug could prove to be a prudent choice.


Introducing the magnificent realm of Harley-Davidson motorcycles, where power, precision, and performance converge. Among the myriad of components that contribute to the exhilarating ride, the spark plugs hold a crucial role in igniting the fiery passion within these legendary machines.

Step into the spotlight, the copper-electrode spark plugs that have garnered acclaim for their extraordinary capabilities. Emblazoned with the promise of a hotter, larger spark, these marvels outshine their counterparts through the ingenious U-groove electrode design. This innovative configuration ushers in a plethora of advantages, offering not only heightened power at soaring RPMs but also an enhanced fuel economy and unparalleled throttle response.

Imagine the thrill of commanding a Harley-Davidson motorcycle, effortlessly harnessing the brute force generated by the meticulously engineered copper-electrode spark plugs. As the engine roars to life, their prowess becomes evident, propelling riders into a realm of unparalleled exhilaration. With each ignition, the harmonious dance between precision and power commences, catapulting the motorcycle to greater speeds and supreme performance.

While some may perceive a slight variance in price, with a set of two spark plugs retailing at $21.19 USD, it is imperative to consider the immense value they offer. These copper-electrode wonders are not merely accessories; they are a testament to the relentless pursuit of excellence that defines the Harley-Davidson legacy. As a high-performance replacement option, meticulously crafted to fit the esteemed Harley-Davidson Twin Cam motors from 1999 onwards, and Sportster motors from 1986 onwards, they seamlessly integrate into the heart and soul of these iconic machines.

The allure of Harley-Davidson motorcycles transcends the mere act of riding; it encapsulates a lifestyle, a passion, and an unwavering commitment to unbridled power. The copper-electrode spark plugs embody the essence of this captivating world, serving as the spark of inspiration that ignites the desire for adventure and the pursuit of the open road.

So, my fellow enthusiasts, let us embark on this exhilarating journey, where every twist of the throttle and every ignition of the spark plugs unveils a world filled with unrelenting power, unrivaled performance, and an unwavering connection between man and machine. Welcome to the realm of Harley-Davidson motorcycles, where the extraordinary becomes the norm and the limits of possibility are constantly shattered.


The Denso iridium spark plugs, renowned in the realm of Harley-Davidson motorcycles, boast an impressive lifespan and replacement cadence that sets them apart from the competition. With a recommended usage duration of up to 30,000 miles in various applications, these spark plugs signify their exceptional durability by exhibiting only minimal performance degradation even at the time of replacement.

Priced at a modest $10.99 USD per spark plug, the Denso iridium spark plugs provide an enticing proposition for Harley-Davidson enthusiasts seeking enhanced performance and longevity. While they may be marginally more expensive than their copper-electrode counterparts, their value is truly evident when compared to other iridium spark plug options available in the market.

Specifically engineered for Twin Cam motors manufactured from 1999 onwards, as well as Sportster motors from 1986 and beyond, these spark plugs align perfectly with the needs of Harley-Davidson riders across different generations. The compatibility with such a wide range of models reflects Denso’s commitment to catering to the diverse needs of Harley-Davidson enthusiasts.

In addition to their impressive durability and compatibility, the Denso iridium spark plugs are also designed to deliver optimal performance, igniting the fuel mixture with precision and efficiency. This not only enhances the overall power output of the engine but also ensures smooth and reliable operation, allowing riders to experience the exhilaration of the open road without any hesitation or compromise.

Furthermore, the iridium construction of these spark plugs offers several advantages over traditional options. Iridium, known for its exceptional hardness and resistance to corrosion, enables the spark plugs to withstand the harsh operating conditions encountered during motorcycle rides. This durability ensures that the spark plugs maintain their performance integrity for extended periods, reducing the need for frequent replacements and saving both time and money for Harley-Davidson owners.

While there are numerous choices available in the market, the Denso iridium spark plugs stand out as a premium option for Harley-Davidson riders who value top-notch performance, long-lasting reliability, and compatibility across different models. Embracing the rich heritage of the iconic brand, these spark plugs epitomize the dedication and craftsmanship associated with the Harley-Davidson experience, allowing riders to unleash the full potential of their machines and embark on unforgettable journeys with unparalleled confidence.


Harley-Davidson enthusiasts are in for a treat with these exceptional spark plugs that redefine performance and longevity. NGK, renowned for their innovative engineering, introduces a revolutionary design featuring a smaller iridium electrode. This groundbreaking feature, skillfully advertised by NGK, not only ignites the fuel-air mixture flawlessly but also contributes to extending the life of the ignition system by reducing voltage needs.

To enhance the durability of these spark plugs, NGK has incorporated anti-corrosion properties into the shell plating. This ingenious addition safeguards the plugs against the harsh elements, ensuring they remain in pristine condition for an extended period. Harley-Davidson riders can now rest assured that their spark plugs will withstand the test of time, providing reliable performance mile after mile.

One notable attribute of these NGK spark plugs is their 14mm thread, a perfect fit for most Twin Cam engines manufactured from 1999 to 2016. This broad compatibility allows a wide range of Harley-Davidson enthusiasts to experience the benefits of these exceptional plugs. Regardless of your model or year, these spark plugs are a seamless upgrade that guarantees optimal performance and reliability.

Furthermore, what sets these NGK spark plugs apart from the competition is their pricing structure. Priced at an affordable $15.99 for a pair of two plugs, they offer incredible value for money. This shift from the traditional practice of selling spark plugs individually is a welcome change, as it not only saves riders money but also ensures they have a backup plug readily available.

As an expert in the realm of Harley-Davidson motorcycles, I can confidently say that these NGK spark plugs are a game-changer in the industry. Their smaller iridium electrode, anti-corrosion shell plating, and 14mm thread compatibility make them the ideal choice for Harley-Davidson Twin Cam engines. Additionally, their competitive pricing and convenient packaging demonstrate NGK’s commitment to providing exceptional quality and value to riders.

In conclusion, these NGK spark plugs are a testament to the relentless pursuit of excellence in the world of Harley-Davidson motorcycles. Designed to optimize performance, enhance longevity, and offer unbeatable value, they are the ultimate choice for any Harley-Davidson enthusiast seeking to elevate their riding experience to new heights. Embrace the power of innovation and reliability with NGK spark plugs, and ignite your Harley-Davidson’s potential like never before.

Table of Spark Plug Options with Brand, Electrode Material, Thread/Reach/Hex Size, and Additional Features & Benefits

Brand Electrode Material Thread, Reach, and Hex Size Additional Features and Benefits
E3 Spark Plugs Copper 14mm thread
0.750” reach (19.05mm)
13/16” hex size
Patented DiamondFIRE ground electrode advertises a longer electrode life
Champion RA8HC Copper 12mm thread
0.75” reach (19.05mm)
5/8” hex size
Closest-built replacement to OEM spark plug options
Accel 2418 Copper 12mm thread
19mm reach
5/8” hex size
Advertised as a high-performance spark plug with a hotter spark due to a U-shaped ground electrode.
Denso IXU22 Iridium Spark Plug Iridium 12mm thread
19mm reach
5/8” hex size
Iridium-electrode replacement option for Twin Cam and Sportster motors
NGK Iridium IX Iridium 12mm thread
19mm reach
5/8” hex size
Smaller iridium electrode reduces voltage demands and preserves the life of the ignition system.

Fuel, Air, and Spark Show – What Do Spark Plugs Do?

For those who may not possess a comprehensive comprehension of the fundamental purpose of a spark plug, allow me to enlighten you with a concise explanation regarding the captivating air/fuel/spark spectacle that unfolds within the realm of combustion engines, while elaborating on the crucial role played by spark plugs in this enthralling performance.

Combustion engines, the epitome of mechanical marvels, rely on the magnificent trinity of fuel, air, and spark to orchestrate a symphony of controlled explosions. Fuel is meticulously extracted from the reservoir of the gas tank and transported to the heart of the engine, where it encounters the fuel injectors or carburetor. From there, in a choreographed sequence, the fuel is either artfully sprayed or judiciously injected into the cylinder, in perfect synchrony with the simultaneous entry of air into the engine through the throttle body and air filter. This harmonious convergence of air and fuel within the cylinder engenders an environment brimming with potential, ripe for the inception of a miniature yet captivating explosion.

But what, you may ask, is the catalyst that ignites this amalgamation of air and fuel, instigating the awe-inspiring detonation? Ah, dear reader, let me introduce you to the enigmatic protagonist of our story—the spark plug.

The spark plug, an unassuming yet essential component nestled within the inner sanctum of the engine, assumes the momentous responsibility of igniting the volatile mixture residing within the cylinder. Like a maestro wielding a conductor’s baton, the spark plug commands an orchestra of electrical energy, harnessing its power to generate a precisely timed and exquisitely potent spark. This spark, fueled by the combined forces of electricity and combustion, ignites the compressed air/fuel concoction, transforming it into an explosive force that propels the engine forward with an adrenaline-inducing surge.

However, the significance of the spark plug transcends its role as a mere ignition initiator. It is a virtuoso performer that must adapt to the unique demands and intricacies of different engines, captivatingly navigating the realm of temperature extremes, varying fuel compositions, and combustion pressures. The spark plug’s design, construction, and specifications are meticulously tailored to ensure optimal performance, efficiency, and durability, aligning harmoniously with the engine’s intricate ecosystem.

In the realm of Harley-Davidson motorcycles, where power, passion, and performance converge, the spark plug assumes an even more profound significance. These iconic machines, renowned for their thunderous roars and uncompromising spirit, require spark plugs that epitomize precision, reliability, and resilience. As a Harley-Davidson expert, I am well-versed in the art of selecting spark plugs that not only kindle the fiery souls of these remarkable bikes but also embody the values and aspirations of their discerning riders.

So, dear reader, as you embark on this journey into the realm of combustion engines, remember to appreciate the unsung hero that is the spark plug—a small yet indispensable instrument, harmonizing the elements of fuel, air, and spark, and propelling the heart of your Harley-Davidson with unbridled passion and unrivaled power.

If you possess a roaring combustion engine, one of the vital components responsible for initiating the explosive power within the cylinders is none other than the spark plugs. These magnificent devices consist of an insulated electrode, a wire, and an ignition coil, forming a crucial link between the ignition system and your engine. Picture this: one end of the spark plug is connected to the ignition coil, while the other end securely screws into the cylinder head of your majestic Harley-Davidson machine.

The ignition coil, like a conductor of lightning, generates and carries the voltage current, ultimately triggering the spark within the electrode housed snugly within the cylinder head. As this electrifying spark springs to life, it ignites the fuel and air mixture, a fiery concoction swirling fervently within the cylinder. It is at this very moment that the magic of combustion unfolds, unleashing a thunderous boom that reverberates through the soul of your motorcycle.

Now that you possess a deeper understanding of the pivotal role played by spark plugs in your motorcycle’s engine and their remarkable functioning, you may find yourself curious about the intriguing discussions surrounding various aftermarket spark plug options and their individual merits when utilized in your prized Harley-Davidson steed. You see, spark plugs are not all created equal. They come in a multitude of configurations, each featuring distinct electrode materials designed to excel in specific mechanical environments or offer extended durability. Interestingly, the most expensive spark plugs may not always prove to be the optimal choice for your engine’s well-being. Such diversity raises the question: what are these captivating differences?

When delving into the world of aftermarket spark plugs, you will encounter a captivating array of electrode materials that can shape the performance and longevity of your motorcycle’s engine. Some options boast remarkable capabilities in certain conditions, while others prioritize endurance. This rich tapestry of choices empowers you to select spark plugs that align perfectly with your Harley-Davidson’s requirements. By understanding these differences, you can unlock hidden potential, elevate your riding experience, and ensure your engine’s continued prowess.

Let us embark on a thrilling exploration of the unique advantages bestowed by various aftermarket spark plug options for your Harley-Davidson motorcycle. From fine-tuned platinum electrodes to the enduring allure of iridium, each material possesses its own remarkable attributes and brings forth a distinct set of benefits. By comprehending the intricacies and nuances of these alternatives, you can unleash the true spirit of your Harley-Davidson, infusing it with enhanced power, efficiency, and reliability.

So, let us embark on this captivating journey to unravel the secrets behind the divergent spark plug options available in the aftermarket realm, guiding you towards making an informed decision that will elevate your Harley-Davidson riding experience to unparalleled heights.

What is the difference between core electrode materials, and how does it translate to engine performance?

When it comes to selecting the ideal core materials for Harley-Davidson motorcycles, there are two distinct perspectives: that of the manufacturer and that of the riders and tuners themselves. Engaging in a debate about which material is superior is akin to arguing over the superiority of one beer brand over another. While they all serve the same purpose, certain materials excel in specific environments or, in the case of spark plugs, different types of engines. This ongoing discourse revolves around the different materials used in spark plug electrodes, and I’ll delve into the three main contenders: copper, iridium alloy, and platinum.

Copper electrodes are undeniably the most commonly found spark plug option, largely due to their affordability. Although they come at a lower price point, they do have a trade-off in terms of longevity. Copper spark plugs have a lower melting point and tend to wear out more quickly compared to their iridium or titanium counterparts. However, copper electrodes offer superior conductivity when compared to iridium and platinum, making them a popular choice for modified or high-compression engines. This preference arises from the fact that copper plugs maintain cooler temperatures during operation, providing optimal performance in these demanding engine setups.

Iridium alloy spark plugs, on the other hand, may not be as budget-friendly as copper plugs, but they make up for it with their extended lifespan and enhanced mileage. The higher melting point of iridium allows these plugs to endure much longer than copper ones. However, it is essential to note that iridium plugs are not as conductive as copper variants. In high-performance applications, such as modified or high-compression engines subjected to heavy loads, iridium spark plugs may encounter certain challenges. Their performance tends to be more consistent in stock environments, where engine heat is controlled and predictable, as opposed to the rigors of a modified engine.

Now, let’s turn our attention to platinum spark plugs. Although the name may evoke a sense of elegance, their use cases are relatively specific. Platinum electrodes exhibit superior resistance to corrosion over extended periods, potentially surpassing even iridium plugs in terms of lifespan due to platinum’s inherent hardness. These spark plugs are particularly well-suited for newer engines equipped with electronic ignitions or distributorless ignition systems (DIS). Platinum plugs are available with either a single platinum coating or a double platinum coating, depending on the engine type and the manufacturer’s specifications.

To summarize, choosing the right replacement spark plug for your Harley-Davidson motorcycle need not be a complex undertaking. You have three material options: copper, iridium, and platinum. Each material offers unique advantages, depending on whether you seek a replacement that matches the original equipment manufacturer (OEM) specifications or you desire a high-performance spark plug that improves fuel efficiency and power output compared to your current plugs. It’s worth noting that new technologies and materials are constantly emerging in the realm of spark plug replacements, which may influence your decision regarding the brand, material, or type to select.

When shopping for replacement spark plugs, it is crucial to double-check their compatibility with your specific engine before making a purchase. Remember, higher price tags do not always guarantee a superior product. Each tier of spark plug material offers competitively priced options that can serve as excellent replacements. While using a premium material like platinum has its advantages, it is important to consider whether it aligns with your engine’s specific requirements. Ultimately, installing a fresh set of spark plugs can enhance your motorcycle’s performance, potentially boosting horsepower output and improving fuel efficiency, ensuring a smoother and more enjoyable ride on two wheels.

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