Best Harley Spark Plugs | Reviews & Recommendations

Truly finding the harley spark plugs is only effective if you can get your hands on some options, which is exactly what we did.

After researching many products, we shaved the list down to the top 10 options today by researching design, capability, durability, features, price, and overall build quality.

We researched hours on these products and compared them to one another to see which one is the best for every need. Read this harley spark plugs article with an extensive buying guide if you're interested in buying or learning about these harley spark plugs.

# Preview Product Score
1 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)

9.7
2 Iridium Spark Plugs IX DCPR7EIX for 1999-2016 Harley Davidson Twin Cam 2pcs

Iridium Spark Plugs IX DCPR7EIX for 1999-2016 Harley Davidson Twin Cam 2pcs

9.3
3 2Pcs CNPAPC Upgrade Double Iridium IX Spark Plugs DCPR7EIX #3144 #6046 #97637 for 1999-2016 Harley Davidson Twin Cam…

2Pcs CNPAPC Upgrade Double Iridium IX Spark Plugs DCPR7EIX #3144 #6046 #97637 for 1999-2016 Harley...

9.6
4 E3 Spark Plugs E3.36 Powersports Spark Plug, Pack of 1

E3 Spark Plugs E3.36 Powersports Spark Plug, Pack of 1

9.6
5 NGK 6046 DCPR7EIX Spark Plug (Pack of 2)

NGK 6046 DCPR7EIX Spark Plug (Pack of 2)

9.8
6 TONRYCUE Spark Plug Wires for Harley Davidson Big Twin 1999-2019 FXD Dyna FXDWG Softail

TONRYCUE Spark Plug Wires for Harley Davidson Big Twin 1999-2019 FXD Dyna FXDWG Softail

9.8
7 E3 Spark Plugs E3.34 Powersports Spark Plug, Pack of 1

E3 Spark Plugs E3.34 Powersports Spark Plug, Pack of 1

9.7
8 NGK 7634 Spark Plug, black

NGK 7634 Spark Plug, black

9.4
9 NGK 3521 CR9EIX Spark Plug (Iridium IX)

NGK 3521 CR9EIX Spark Plug (Iridium IX)

9.3
10 Autolite 4265-4PK Copper Resistor Spark Plug, 4 Pack

Autolite 4265-4PK Copper Resistor Spark Plug, 4 Pack

9.4

List of best harley spark plugs  Reviews

SaleBestseller No. 1

NGK Iridium IX DCPR7EIX Spark Plugs for 1999-2016 Harley Davidson Twin Cam (Pair)

  • Come pre-gapped
  • The iridium electrode is 25% smaller than a platinum electrode, and it's just 1/4 the size of a conventional nickel electrode
  • Ultra-small diameter center electrode reduces voltage requirement and extends ignition system life
  • The ultimate in spark plug technology and performance from the industry leader
  • New metal shell plating has enhanced anti corrosion qualities
SaleBestseller No. 2

Iridium Spark Plugs IX DCPR7EIX for 1999-2016 Harley Davidson Twin Cam 2pcs

  • Iridium IX offers extreme ignitability, improved throttle response.
  • Ultra-small diameter center electrode reduces voltage requirement and extends ignition system life
  • lower fuel consumption
  • If it has the same parameters as this product, it can be compatible
  • New metal shell plating has enhanced anti corrosion qualities
Bestseller No. 3

2Pcs CNPAPC Upgrade Double Iridium IX Spark Plugs DCPR7EIX #3144 #6046 #97637 for 1999-2016 Harley Davidson Twin Cam…

  • 【SUPER POWER】Double Iridium IX Spark Plugs are designed specifically for the performance enthusiast. Iridium IX offers extreme ignitability, improved throttle response. Double iridium is the best spark plug material
  • 【MORE FUEL EFFICIENT】The flameout phenomenon rarely occurs when using double iridium spark plugs,The engine can also be kept in good running condition, resulting in lower fuel consumption. So it is really necessary to replace the good double iridium spark plugs.
  • 【LONGER LIFE】The fine Double Iridium tip ensures high durability and a consistently stable spark. Double Iridium alloy has extremely high melting point, perfect for today's high-tech, high-performance engines. Trivalent Metal Plating - Outstanding acceleration, long life ,high fuel efficiency and durability. Ultimate design, technology and performance.
  • 【COMPATIBLE MODELS】DCPR7EIX #3144 Replacement racing spark plug used by many professional car drivers and fit for 2000 Dyna Super Glide;1999-2016 Harley Davidson Twin Cam;XL Sportster 883/1200 1986-present; Ultra;Suzuki Boulevard ;If it has the same parameters as this product, it can be compatible
  • 【QUICK AFTER SALES SERVICE】One order = 2 Pieces ,We provide 12 months warranty service for this spark plugs, and we attach great importance to every customer's satisfaction. If for any reason we are not meeting your expectations, please feel free to contact us and we will do our best to resolve all your concerns.
Bestseller No. 4

E3 Spark Plugs E3.36 Powersports Spark Plug, Pack of 1

  • Fit Type: Universal Fit
  • The Patented Diamondfire Ground Electrode Is Secured To The Shell With Two Legs To Help Facilitate Heat Transfer, And To Withstand The Intense Vibration Of Powersport Engine Applications
  • Improved Starts: Patented Edge-To-Edge Design Concentrates Spark Energy, Which Results In Quick And Easy Starts In Any Conditions
  • For High-Performance Engines: Motorcycle Spark Plug For A Variety Of Powersport Applications, Specifically Designed To Increase Power, Reduce Fuel Consumption, And Improve Hydrocarbon Emissions
Bestseller No. 5

NGK 6046 DCPR7EIX Spark Plug (Pack of 2)

  • Quality Assured
Bestseller No. 6

TONRYCUE Spark Plug Wires for Harley Davidson Big Twin 1999-2019 FXD Dyna FXDWG Softail

  • Fitment: for Harley Davidson Big Twin 1999-2019 FXD Dyna Softail
  • Material: Made of high quality rubber material, Constructed with silicone throught the jacket, insulation and core to deliver high-temperature resistance
  • Rated Temperature: Rated at SAE Class E J2031 with a continuous operating temperature of 450° F
  • Package Included: 1 * spark plug wires
SaleBestseller No. 7

E3 Spark Plugs E3.34 Powersports Spark Plug, Pack of 1

  • FOR HIGH-PERFORMANCE ENGINES: Motorcycle spark plug for a variety of powersport applications, specifically designed to increase power, reduce fuel consumption, and improve hydrocarbon emissions
  • PATENTED TECHNOLOGY: DiamondFIRE ground electrode is secured to the shell with 2 legs that help facilitate optimal heat transfer and withstand the intense vibration of powersport engine applications
  • IMPROVED STARTS: Patented Edge-to-Edge design concentrates spark energy, which results in quick and easy starts in any conditions
  • WHAT'S INCLUDED: One (1) E3.34 spark plug with a 90-day warranty. Features 14mm thread diameter; 0.750-inch thread reach plug with gasket seat; 13/16-inch hex size
  • REPLACES: Champion RN9YC, RN11YC, and RN12YC; NGK BPR5ES, BPR6ES, BPR7ES, and BR5ES
SaleBestseller No. 8

NGK 7634 Spark Plug, black

  • Fit type: Vehicle Specific
  • Quality Assured
  • Part number: 7634
  • Included components: SPARK PL
Bestseller No. 9

NGK 3521 CR9EIX Spark Plug (Iridium IX)

  • OEM/OES Manufacturer
  • High Quality
  • World Wide Leader
Bestseller No. 10

Autolite 4265-4PK Copper Resistor Spark Plug, 4 Pack

  • Copper-glass seal bonds insulator, terminal post, and center electrode together to provide a tight seal that is 100 percent leak-proof
  • Cold-formed steel shell and precision rolled threads, with one-piece terminal post to add strength
  • Multi-rib insulator reduces danger of "flash-over"
  • Resistor reduces radio frequency interference (RFI) and electrode erosion
  • Full copper core electrode provides better performance in all conditions
Review

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