Best Spark Plugs For Harley Davidson – No More Confusion!

A spark plug is a crucial device that any bike owner should invest in. It is a device that conveys electric currents from the bike’s ignition to the engine’s combustion chamber. It works by igniting the compressed blend of air and fuel. Any bike, including the Harley Davidson, needs the best spark plugs to start better and boost the engine’s performance. Typically, it’s good to change spark plugs regularly for the best performance. The following is a list of the best spark plugs for Harley Davidson to help you get the best. If you are in a hurry and need to know one or two top reliable spark plugs, consider E3 Spark Plugs E336 or NGK Iridium IX DCPR7EIX, although we suggest full reading.

Best Spark Plugs For Harley Davidson

Great for All Harley
E3 Spark Plugs E3.36 Powersports Spark Plug, Pack of 1
Best for Twin Cam
NGK Iridium IX DCPR7EIX Spark Plugs for 1999-2016 Harley Davidson Twin Cam (Pair)
Best for Sportster
NGK 6046 DCPR7EIX Spark Plug (Pack of 2)
Best for Softail
Iridium Performance Spark Plugs Pair for Harley Softail Slim Twin Cam repl. Harley# 6R12
Best for Road King
Harley Road King Performance Spark Plugs Pair repl. OEM# 6R12
E3 Spark Plugs E3.36 Powersports Spark Plug, Pack of 1
NGK Iridium IX DCPR7EIX Spark Plugs for 1999-2016 Harley Davidson Twin Cam (Pair)
NGK 6046 DCPR7EIX Spark Plug (Pack of 2)
Iridium Performance Spark Plugs Pair for Harley Softail Slim Twin Cam repl. Harley# 6R12
Harley Road King Performance Spark Plugs Pair repl. OEM# 6R12
Great for All Harley
E3 Spark Plugs E3.36 Powersports Spark Plug, Pack of 1
E3 Spark Plugs E3.36 Powersports Spark Plug, Pack of 1
Best for Twin Cam
NGK Iridium IX DCPR7EIX Spark Plugs for 1999-2016 Harley Davidson Twin Cam (Pair)
NGK Iridium IX DCPR7EIX Spark Plugs for 1999-2016 Harley Davidson Twin Cam (Pair)
Best for Sportster
NGK 6046 DCPR7EIX Spark Plug (Pack of 2)
NGK 6046 DCPR7EIX Spark Plug (Pack of 2)
Best for Softail
Iridium Performance Spark Plugs Pair for Harley Softail Slim Twin Cam repl. Harley# 6R12
Iridium Performance Spark Plugs Pair for Harley Softail Slim Twin Cam repl. Harley# 6R12
Best for Road King
Harley Road King Performance Spark Plugs Pair repl. OEM# 6R12
Harley Road King Performance Spark Plugs Pair repl. OEM# 6R12

1. E3 Spark Plugs Powersports E336 – For Most Harley


Check More Photos and Price at: amazon.com

Any car or bike owner in search of was to boost the motor’s horsepower should consider the E3 spark plug. The device is an excellent one since the manufacturer made it to offer the best performance on any engine. The device is among the best Harley Davidson spark plugs considering the superior spark that’s incomparable with most competitors.

The spark plug incorporates a design that boosts the engine’s performance by producing a vigorous power boost. With a dual Diamond-Fire ground electrode, you will get a better combustion pressure with every stroke of the engine. That leads to reduced emissions, faster starts, better power output, and an improved fuel economy.

Performance

The device offers a faster ignition due to the dual ground electrode, leading to better combustion of both air and fuel for the bike’s smoother acceleration. Since it incorporates a cold and heat range, your bike will handle any condition, unlike most plugs.

Is there any complaint?

One thing many dislike regarding the device is being highly reactive. Even if it incorporates a long insulator nose, it still entangles on the bike.

2. NGK Iridium IX DCPR7EIX – Best for Harley Twin Cam


Check More Photos and Price at: amazon.com

The device comes as a set of reliable OEM spark plugs, and they are shipped pre-threaded and gapped to fit into most Harley-Davidson bikes. It includes an iridium tip for faster and actual ignitions if you have reliable sparks. The tip has gone through laser welding and lasts for over 60,000 miles. Being designed to cut voltage, it boosts the ignition system life.

Performance

The spark plug incorporates an exclusively long nose insulator that hinders the plug tip from entangling. The insulator also hinders the engine’s misfires or normal worsening. Being 25 percent smaller than most devices, it can deliver up to 3 horsepower. The spark plug is metal plated to prevent corrosion, and easy wear off. The device can comfortably withstand any weather conditions without affecting its performance.     

Is there any complaint?

  • Not ideal for modified engines
  • It may need gap adjustments
  • It’s pricier  

3. E3 Spark Plugs E3.34 Powersports – For Most Harley


Check More Photos and Price at: amazon.com

If looking for the best spark plug for Harley Sportster, this is the device to get, especially if you want smooth acceleration. The device incorporates a ground electrode component that promotes efficient fuel burning for better pressure in the cylinder.   

Performance

The previous ignition leaves the spark zone faster, and the lifted edge offers a chimney impression. Such features promote faster occurrence in the next ignition.

Is there any complaint?

  • Not compatible with most brands

4. NGK DCPR7EIX 6046 – Best for Harley Sportster


Check More Photos and Price at: amazon.com

The device is specifically designed for those in search of better performance. It offers an instant ignition, better throttle reaction, and an excellent anti-tangling, making it the best spark plugs for Harley 103.

Performance 

The device incorporates a high melting point ideal for better engine performance. It also offers better strength and heat transfer core that is helpful in heat removal. The triple seal is there to prevent leakage and has a better electrode enhancement.

Is there any complaint?

  • The adjustments are fragile and also not efficient when it comes to fuel.

5. Champion RN12YC (404) Copper Plus


Check More Photos and Price at: amazon.com

The device incorporates plugs well made with corrosion resilient zinc shell. With a high and durable voltage, you are sure to get the best performance on your engine. Many love the device for the faster ignition that leads to better performance on all conditions.

Performance

The spark plug features a heat-active alloy, a ground electrode, and fine wires for a powerful performance. The device can reach high temperatures and still maintain a stale performance while still offering a sharp spark focus.

Is there any complaint?

  • Poor packaging

Spark Plug Working Science

The spark plug is located on the cylinder head where the piston moves down the cylinder as it picks the mixture of air and fuel. The piston will then return to the spark plug as it compresses the air. The spark plug ignites the mixture and forces the piston down again for more power and then goes back to the spark plug again. The cycle keeps going, and the vehicle keeps moving.

Best Brands – Who Makes Harley Davidson Spark Plugs

E3 Spark

The brand is among the most reliable ones when it comes to spark plugs production. The products incorporate a Diamond-Fire technology that increases the vehicle’s performance. The brand is famous for producing excellent racing gears since producing better engine burns is their priority.  

NGK

Being a Japan-based brand with over 80 years of experience, the company produces better OEM and motorcycles accessories to boost automotive performance.

Do Spark Plug Brands Matter?

Spark plug brand matters since they are not alike. Some are durable and better performers compared to the rest. 

Harley Davidson Spark Plug Gap Chart

The spark plug gap incorporates a bearing on the motorcycle’s engine performance. The plug gap size determines the amount of air or fuel to get to the spark for easier ignition. Check the chart to get the right fuel or air.

What are the Best Spark Plugs for Twin Cam Motorcycles?

NGK Iridium IX Spark Plug 6509 is the ideal spark plug for the Twin Cam motorcycle. If you want to replace your Harley spark plugs, this is the device to get.

What is the best Spark Plug for Harley Best Road King 6R12?

The Orange Cycle PU-196-OCP is the ideal device for those with 6R12 bike considering its performance and reliability. 

What is the Best Spark Plug for Harley Softail?

The Iridium Performance OCP0231-AZ3 is there to boost performance and stay safe from corrosion. The low fuel consumption also makes it the ideal choice for Harley Soft-tail. 

NGK vs. Denso – Which Spark Plugs is better?

The NGK is better than Denso since Denso electrodes diameter shrinks more than those on the NGK. Denso models may not be as durable as the NGK ones, but they offer better sparks.

Copper Spark Plugs vs. Iridium Spark Plugs

Iridium is not a better performer compared to copper ones since they are less conductive and can overheat. However, they last longer than the copper ones, but copper remains the best performer.

What are the Best Spark Plugs For Fuel Economy?

The best spark plugs to those seeking to save on fuel are the ones with iridium construction. Such models offer better performance, improved gas mileage, and longevity.

Should I Use OEM Spark Plugs?  

The OEM spark plugs are the best models to own even if durability is not an issue for you. They offer superb performance and fuel economy for your peace of mind.

How Often Should I Change Spark Plugs on My Motorcycle?

It’s good to replace the spark plugs every 15,000 to 16,000 miles.

Concluding Remarks

Choosing the ideal spark plug is not always easy, considering the numerous choices available. But with the above list of the plugs offering unbeatable performance, you need not worry. You will get better fuel efficiency, super performance, and longevity in any of the above.

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