Best Spark Plugs for Harley Davidson in 2021

Spark Plugs and Harley Davidson Bikes have a deep relationship as performance has to beat performance. As a Harley Bike can perform in the long run, there is a need for the best spark plugs to serve for long. You must acquire the best spark plug for Harley Davidson.

Every motorbike requires high-quality spark plugs to ensure that it gives out a top-notch performance and enhances the efficiency rate. If you don’t replace your bike’s spark plug on time, it might undergo a pretty sharp misfire.
To avoid any misfire, it needs to take careful steps from installation to maintenance. It can increase the lifetime of both the spark plug and your bike. We are not focusing on these steps but come up to you with spark plugs with excellent amiability.

When selecting the right spark plug, you must consider the types of electrodes used and the reaching thread. Also, some plugs’ heat transfer ability must be checked out, transferring efficient heat from the firing tip to the cooling system.

8 Best Spark Plugs for Harley Davidson in 2021

This post lists 8 best spark plugs for Harley Davidson to make your selection process simple. Our choice of spark plugs is especially for Harley Davidson bikes. Now, let’s get into the most robust collection of spark plugs available without any further delay.


E3 E3.54 Premium Spark PlugWeight: 1.6 ounces
Size: 14 mm
Thread length: 1.8 cm
Dimensions: 5.85 x 1.65 x 1.45 inches
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NGK 6046 Spark PlugWeight: 1.28 ounces
Size: 16 mm
Thread length: 1.9 cm
Dimensions: 4.8 x 2.4 x 2.1 inches
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Autolite AP104-4PK Platinum Spark PlugWeight 6.4 ounces
Size 16 mm
Thread length 1.4 cm
Dimensions 1 x 1 x 3.38 inches
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E3 E3.38 Spark Plugs Powersports Spark PlugWeight: 1.6 ounces
Size: 10 mm
Thread length: 1.9 cm
Dimensions: 6.5 x 4.5 x 0.5 inches
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Denso PK20TT Spark PlugWeight: 0.28 x 6 g
Size: (11+11) mm
Thread length: 1.9 cm
Dimensions: 1.1 x 3.4 x 1.2 inches
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NGK 7090-4PK G-Power Spark PlugWeight: 2.88 ounces
Size: 16 mm
Thread length: 1.9 cm
Dimensions: 3.4 x 1.1 x 0.9 inches
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ACDelco 41-962 Platinum Spark PlugWeight: 2.88 ounces
Size: 19 mm
Thread length: 1.4 cm
Dimensions: 4.7 x 4.3 x 2.3 inches
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Bosch9694 Double Iridium OE Spark PlugWeight: 6.4 ounces
Size: 12 mm
Thread length: 1.8 cm
Dimensions: 0.94 x 4.02 x 1.06 inches
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1. E3 E3.54 Premium Spark Plug: Top-Rated Pick


Get Set! We are presenting you with the most premium spark plug for your Harley Davidson Bike. For every biker who needs a spark plug for long-term usage yet an efficient one, the E3 spark plug is the best option to go with. Due to its quality and brand perfection, we kept it at the top of our list.E3 E3.54 Premium Spark Plug

People who used to travel need to have enough plugs for changing if required. So, here you get a pack of eight spark plugs.

Features:

Design and Construction:

The E3 spark plug has a convenient design, which is easy to replace your old plug with. Don’t worry about the construction, and you get plugs that perform not for months but years. Their three legs secure the DiamondFIRE electrode for proper heat transfer.

Highly Versatile:

The E3 spark plug is quite versatile that fits almost every model of Harley Davidson. But make sure to check your model availability before making any purchase. But we still only suggest E3 opt for your bike to get smooth acceleration.

Electrodes:

Apart from the DiamondFIRE electrode, the E3 plug comes with the ground electrode and full-size center electrode. All these three electrodes ensure the prevention of heat leakage and build up more airflow in the cylinder.

DiamondFire Side Wire:

In today’s time, eco-friendly demands are escalating. With this in mind, the E3 plug equips a side wire. This wire helps reduce the emission of hydrocarbons. It also increases mechanical power and reduces fuel consumption.

Tech Specifications:

Product Weight: 1.6 ounces
Product Size: 14 mm
Thread length: 1.8 cm
Dimensions: 5.85 x 1.65 x 1.45 inches

Pros
  • Perfect size and thread reach
  • Multiple and secured electrodes
  • Multifolds engine performance
  • Robust performance and eco-friendly
Cons
  • Need compatible model

Our Review:

One can rate a spark plug must base on the ignition and how efficiently it can burn the fuel. E3 plug is what you get to power a motorcycle.

2. NGK 6046 Spark Plug: Editor’s Choice


As per Editor’s Choice, the NGK6046 Spark Plug is on the second number in our list and a brand leader across the spark plug market. People who are fond of traveling will undoubtedly require plenty of plugs. Here, get a pack of two spark plugs; and it is the second set of these plugs, and the last ones are still great. NGK 6046 Spark Plug

These plugs work better than the HD Platinum plugs or the standard plugs. They will give you improved throttle response, superior anti-fouling, and even considerable fuel economy.

Features

Design and Construction

The NGK6046 Spark Plug is specifically designed for the performance enthusiast; Iridium IX contributes advanced ignitability, improved gas-feed response. Because of the standard quality and technical perfection, it is constructed to satisfy the most uncompromising models.

Very Adaptable

The NGK Spark Plug is highly adaptable, which suits almost all models of Harley Davidson. Its more extended insulator nozzle checks fouling while the folded ribs on the insulator prevent flashover. So, for the smooth-riding of your bike, you must indeed go for the NGK spark plugs.

Electrodes

The NGK 6046 Spark Plug comes with the ground electrode and full-size center electrode. It has a 0.6mm laser combined fine Iridium center electrode that secures high strength and stable sparks.

At the same time, the tapered ground electrode decreases the electrical quenching impact. In comparison, the threefold gasket seal reduces combustion gas leakage.

Fine Wire Iridium Alloy

For the latest high-performance bike engines, iridium alloy has a high melting point, presenting high durability to heat and corrosion. At the same time, the trivalent metal plating produces superior anti-seizing features.

Tech Specifications

Product Weight: 1.28 ounces
Product Size: 16 mm
Thread length: 1.9 cm
Dimensions: 4.8 x 2.4 x 2.1 inches

Pros
  • Iridium electrode assures endurance and consistent, stable spark
  • Remarkably high melting point, ideal for high-performance
  • Metal plating is superior anti-seizing and anti-corrosive
Cons
  • Little improvement over old plugs

Our Review:

We are significantly recommending these plugs because they work perfectly for your Harley Partner. They will give you quicker starts and stronger acceleration.

3. Autolite AP104-4PK Platinum Spark Plug: Quality Pick

Autolite AP104-4PK Platinum Spark Plug
Autolite AP104-4PK Platinum Spark Plug

Autolite AP104-4PK Platinum Spark Plug is the fast-performing spark plug presenting superior technology for your Harley Davidson Bike engines. It is one of our favorites brand’s most technologically advanced spark plugs ever.
It is guaranteed that it will deliver a more comfortable and quicker startup and acceleration with less voltage. Moreover, you get a pack of 4 stunning platinum spark plugs.

Features

Perfect Design

With an enhanced 0.6 mm delicate wire design and fashionable platinum side-wire advanced technology, these spark plugs produce more immeasurable endurance. Overall, it also presents a more focused ignition for greater ignitability and maximum stability.

Anti-corrosion Ability

Moreover, the high-grade platinum alloy of this plug is compelled to have prolonged stability. Similarly, these spark plugs also have a nickel-plated steel shell, which is more resistant to corrosion and presents a more dependable performance in all circumstances.

Electrodes

The tip of the AP104-4PK spark plug is composed of center electrodes. It decreases the gap wear so that the plug can get a long-lasting life. Simultaneously, the other side of the electrode maintains a definite gap.

Performance

Autolite Platinum spark plug works considerably to enhance your bike’s engine performance while giving extra mileage. The middle of the electrodes fire instantly and is precisely corresponded to other models of sparks plugs. You can also start it with a low voltage very easily and quickly.

Tech Specifications

Product Weight 6.4 ounces
Product Size 16 mm
Thread length 1.4 cm
Dimensions 1 x 1 x 3.38 inches

Pros
  • Providing a quick startup to your bike.
  • Reasonable price and fantastic performance
  • Made of high-quality material.
  • Anti-corrosion capability.
Cons
  • Complaints about the porcelain portion of this plug.

Our Review

Autolite Spark Plug is versatile and a comprehensive pack for your Harley Davidson Bike. Its super-fast performance will award you more real running than other spark plugs models.

4. E3 E3.38 Spark Plugs Powersports Spark Plug: Performance Pick

If you drive more than one stroke engine, you will aspire to take a moment to look at this spark plug as it ensures the reduction of discharges after around 50-hours. Another distinctive innovation of this spark plug is its capacity to eliminate hydrocarbon residues. E3 E3.38 Spark Plugs Powersports Spark Plug

Once you installed E3.38 Power-sports Spark Plug in your Harley Davidson Bike, it will assure a remarkable increase in your bike strength.

Features

Modern Design

The E3 spark plug highlights an edge-to-edge design that helps create a long-lasting, dependable, and constant spark. Plus, the patented design centers spark energy, which results in fast and smooth starts in all circumstances.

Composition

This spark plug is a combination of two precious metals. The core electrode is made from pure copper, and its top is covered with steel alloy. So, copper in the center electrode for fast igniting spark and the coated steel sheet will show excellent anti-rusting strength.

DiamondFIRE Electrode

E3 E3.38 is also packed with the latest DiamondFire technology, which is an improved electrode production. It will provide more active burning to your bike engines and also giving more strength to the cylinder.

Performance

Likewise, the Diamond-Fire electrode technology creates a superior spark and produces a flame front spreading further into the cylinder, providing more strength. This bike spark plug has a mixture of power sports credentials to boost horsepower, decrease fuel consumption by about 58%, and reduce hydrocarbon discharges by about 42 %.

Tech Specifications

Product Weight: 1.6 ounces
Product Size: 10 mm
Thread length: 1.9 cm
Dimensions: 6.5 x 4.5 x 0.5 inches

Pros
  • Engines run smooth with these spark plugs
  • Gets rid of hard starts
  • Quicker starts and outstanding performance
  • Dramatically longer lifetime.
Cons
  • The lifetime warranty is short.

Our Review

Over the decades, this spark plug presents fantastic performance. It will be an ideal choice for your Harley Davidson bike to develop ways for ventures.

5. Denso PK20TT Spark Plug: Perfect Pick

Denso PK20TT Spark Plug
Denso PK20TT Spark Plug

Denso PK20TT Spark Plugs can perform in low temperatures like iridium though these spark plugs are most prone to overheating. Also, they can last longer than copper or iridium spark plugs.

They are the advanced versions of platinum spark plugs efficient to improve your Harley Davidson Bike engine’s performance. So, they are the perfect pack of six sparks plugs that belong to Denso.

Features

Design and Construction

DENSO is presenting this cutting-edge technology in a platinum-titanium design. This quality PK20 Platinum TT spark plug holds a twin-tip construction to enhance ignitability and prolong safety. Till now, its twin-tip design is seen in the most technologically superior bikes.

Unique Features

With alumina powder insulation is purified, it renders dielectric strength and thermal conductivity. Due to this hallmark, the plug itself can hold up wear and split, even supporting intense pressure.

Plus, it boosts fuel economy, so you comprehend that you would not be using enough fuel when associated with your bike. In contrast to other spark plugs, this plug performs much faster.

Electrodes

The DENSO Platinum PK20TT spark plug uses platinum in the center electrode. It also holds a titanium-packed ground electrode for prolonged stability and decreased cap corrosion.

Fine Platinum and Titanium Alloy

Moreover, its twin-tip technology of precious metals (11 mm platinum) and (11 mm titanium) fight erosion. It is securing superior fire performance and the most generous spark plug life competent for the elongated operation above 60K miles.

Tech Specifications

Product Weight: 0.28 x 6 g
Product Size: (11+11) mm
Thread length: 1.9 cm
Dimensions: 1.1 x 3.4 x 1.2 inches

Pros
  • Faster performance than other sparks plugs.
  • Save your fuel and give extending mileage.
  • Having the feature of dielectric strength.
  • Withstand in extreme stress.
Cons
  • Not perfect for other vehicles.

Our Review

Denso PK20TT Spark Plugs are available at a lower price and a perfect pack for your Bike. It will grant you better speedup and more racing starts than all other sparks plugs.

6. NGK 7090-4PK G-Power Spark Plug: Powerful Pick

NGK 7090-4PK G-Power Spark Plug is one of the best spark plugs that can be used for your Harley Davidson Bike. It can also reduce emissions, boost fuel efficiency as well as increase quick starts. NGK 7090-4PK G-Power Spark Plug

Moreover, thanks to its platinum tip, which is laser welded and the brand scream quality, you’re looking around. Here, a set of four with such a reasonable price is somewhat rare and should be appreciated anytime you do.

Features

Perfect Design

This spark plug is specifically designed for bikes and is distinct from the rest of the other spark plugs. The quality of this spark plug from NGK highlights high-quality configurations that cut down on fouling and heightens accelerator response.

Electrodes

This spark plug’s tips are composed of platinum alloy ground side and center electrode for a more effective spark. Similarly, maintaining and ensuring a definite gap throughout the lifespan of the spark plug.

Anti-corrosion Ability

Besides, this trivalent metal plating spark plug presents an extraordinary superior anti-corrosion and anti-seizing features. In comparison, its triple gasket seal also decreases combustion gas leakage.

So, the high-grade alloy of this plug provides prolonged stability. It also gives a more dependable performance in all conditions.

Performance

Similarly, the NGK G-Power Platinum spark plugs contribute extra-superior performance with augmented fuel energy, more moderate emissions, and faster starts. At the same time, its distinctive configurations are employed for the insulator nozzles to enhance throttle response.

Tech Specifications

Product Weight 2.88 ounces
Product Size 16 mm
Thread length 1.9 cm
Dimensions 3.4 x 1.1 x 0.9 inches

Pros
  • Long-lasting than similar brands.
  • Having no sayings about misfire
  • Installing is very smooth and stress-free
  • Offers smooth and high-acceleration ride
Cons
  • Some users crib their gaps

Our Review:

NGK (7090-4PK) BKR5EGP G-Power Spark Plug is a full and incredible pack for your Harley Davidson Bike. It is presenting high-grade performance and an excellent racing capability.

7. ACDelco 41-962 Platinum Spark Plug: Pro Pick

The ACDelco 41-962 Professional Platinum Spark Plug is designed explicitly for newer engines to speed your Harley Davidson Bike. It will be the right option for engines to increase mileage before a renewal. ACDelco 41-962 Platinum Spark Plug

After installing these spark plugs, indeed, your bike will run a lot smoother. Usually, all spark plugs have a small gap, while the platinum has a 0.6mm aperture.

Features

Unique Design

This spark plug is constructed for bikes and presents high-quality configurations for excellent accelerator response. Similarly, with this spark plug, there would be no problem with a corrosive combustion box, fouling, and spark abrasion. At the same time, its unique double tip design heightens stability.

Electrodes

These spark plugs are equipped with a Platinum alloy in the center electrode for igniting spark. In contrast, the top of the spark plugs is covered with nickel, which shows excellent anti-rusting ability. Likewise, securing and guaranteeing a specific gap during the lifetime of these spark plugs.

Anti-corrosion Ability

Meanwhile, associated with other spark plugs, outcomes confirmed that this spark plug keeps its gapping for the rest of its life. Also, its anti-decaying design presents this spark plug as the most suitable against corrosion.

Performance

The ACDelco Platinum Spark Plug is also providing stunning works and improving your bike’s engine performance to give up to one hundred thousand mileage. Its electrodes fire immediately and correctly. So, you will start your racing-bike with it with a very low voltage, very efficiently, and expeditiously.

Tech Specifications

Product Weight 2.88 ounces
Product Size 19 mm
Thread length 1.4 cm
Dimensions 4.7 x 4.3 x 2.3 inches

Pros
  • Guarantees smooth start-up and expeditious racing
  • Increased gas-feed response and solid material built
  • Smooth Installation and easy replacement
  • Perfect construction for bike engines
Cons
  • Not compatible with all kind of engines

Our Review

The use of Acdelco 41-962 Spark Plugs are suitable for your Harley Davidson Bike. Plus, all 8 plugs will run your bike engine very smoothly and will fix your problems.

8. Bosch9694 Double Iridium OE Spark Plug: Excellent Pick

Bosch9694 Double Iridium OE Spark Plug
Bosch9694 Double Iridium OE Spark Plug

Bosch9694 Double Iridium Spark Plugs is specially made for bike engines to produce extraordinary performance and durability. It is one of the modern and uniquely designed spark plugs yet to be made.

Plus, Bosch Iridium Spark Plugs ensures up to seven years of effectiveness as compared to other stocks. Similarly, the sequence of an electrode inlay and a dual firing pin increases the spark plug performance.

Features

Modern Design

Bosch Spark Plugs are designed to represent the most immeasurable of OE spark plug technology. With a laser combined tapered ground electrode, it gives excellent performance. Also, its ribbed insulator design prevents flashovers.

Electrodes

Moreover, this spark plug is made of precious iridium metal; its iridium center electrode and the ground electrode will help you go for a thousand miles.

Simultaneously, pure copper core ground electrode gives a more significant heat transfer for startup and speed.

Anti-corrosion Ability

Besides, the super strength and most prolonged life are accomplished through 360-degree endless laser welding iridium firing pins. Staying resistant to rusting and other ruins is an extra feature that makes this product stand out from others.

Performance

If you need a spark plug to enhance your touring bike ignition and your overall performance, so this is the perfect option for your bike. With a fine wire firing pin, it gives superior ignitability for its high-end performance.

Tech Specifications

Product Weight 6.4 ounces
Product Size 12 mm
Thread length 1.8 cm
Dimensions 0.94 x 4.02 x 1.06 inches

Pros
  • The unique coating prevents corrosion
  • Guaranteed to last for around seven years
  • Engines would perform smoothly flat and gentle
  • Efficiently increases mileage
Cons
  • No cons have been seen yet

Our Review

Bosch9694 Double Iridium OE spark plug is one of the best spark plugs that delivers excellent functionality.

Final Words

Well! That’s all about the best spark plugs for Harley Davidson till now. Every rider feels proud of having the Harley bike. So, it is necessary to have the right accessories for keeping performance maintained. You should choose between the right and wrong spark plugs wisely.

The right plug can give performance, speed, and power with reduced hydrocarbons emission. In contrast, the wrong plug will put you in a noxious zone, irritating you every time you ride. For that reason, you must invest in a spark plug that can fulfill all the requirements.

We have reviewed the most functional spark plugs available in 2021. Their anti-corrosion abilities make them perfect for serving you for long. Each one has the latest technology-based electrodes and construction, which performs the best.

You can opt for any of these spark plugs for your Harley Davidson Bike. Just think of your needs and pick one out of this list. Best of Luck!

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