Automotive Parts and Accessories

Top 10 Best Spark Plugs For Harley 103 – Available On Market

Last Update:

Did you just search for the Best Spark Plugs For Harley 103 or something similar to that? If yes, then trust us, you have arrived at the right place. In this article, we will take a look at some of the best chosen affordable Spark Plugs For Harley 103 that you can buy online.

We will also take a look at some of the top Spark Plugs For Harley 103 that are highly praised by customers and according to the reviews. Have you ever heard someone say, “A picture is worth a thousand words”?

We’re sure that you have heard this before or maybe it’s one of your favorite quotes too. The reason behind this quote could be because we all know how powerful pictures can be when it comes to advertising.

So if you're curious to know more, keep reading for information on each individual item.

Best Spark Plugs For Harley 103
Disclaimer: As An Amazon Associate I Earn From Qualifying Purchases.
NoProductScoreAction
1NGK Iridium IX DCPR7EIX Spark Plugs for 1999-2016 Harley Davidson Twin Cam (Pair)9.8Buy on Amazon
2Aokus 10.4mm 10mm Spark Plug Wire Compatible with Harley Davidson Big Twin 99-19 FXD Dyna Softail (Blue)9.8Buy on Amazon
3Harley Road King Performance Spark Plugs Pair repl. OEM# 6R129.4Buy on Amazon
4E3 Spark Plugs E3.36 Powersports Spark Plug9.4Buy on Amazon
5Harley Electra Glide Classic Performance Spark Plugs Pair repl. OEM# 6R129.2Buy on Amazon
6NGK # 6046 Iridium Spark Plugs -- DCPR7EIX -- for Harley-Davidson Twin Cam and XL --- 4 PCS NEW9Buy on Amazon
7NGK Iridium IX DCPR7EIX Spark Plugs for Buell9Buy on Amazon
8Autolite 103-4PK Copper Resistor Spark Plug8.6Buy on Amazon
9Accel 2418 Spark Plugs (Pair) 6R12 for Harley Davidson Twin Cam8.4Buy on Amazon
10Iridium Performance Spark Plugs Pair for Harley Softail Slim Twin Cam repl. Harley# 6R128.2Buy on Amazon

Comparison Chart for Best Spark Plugs For Harley 103

If you are looking for a in the market, we have reviewed a few of the best options that are suitable for your needs. Take a look at the list:

Table Of Content:

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

2. Aokus 10.4mm 10mm Spark Plug Wire Compatible with Harley Davidson Big Twin 99-19 FXD Dyna Softail (Blue)

  • Replace for Manufacturer Part Number: DYNA-409BL
  • Fits for virtually like factory location on cylinder Harley-Davidson or Big-Twin that has the coil mounted on the seat post.
  • Perfect Fitment, directly replacement. Made of high quality material, reliable quality and durable.
  • Great for replacement wire, relocation kits, new look, bobbers, scramblers, cafe racer etc
  • Package includes: 2 * blue Spark Plug Wires (one 8″ and one 20″ long wires pre-crimped)

3. Harley Road King Performance Spark Plugs Pair repl. OEM# 6R12

  • Conventional style spark plugs, available in OEM heat ranges
  • Plugs have a unique look with a black ceramic body
  • Insulator is made of 95% pure alumina, features strong resistance to heat shock and superior insulation.
  • Sold in Pairs
  • Harley Road King Twin Cam 2000-2020

4. E3 Spark Plugs E3.36 Powersports Spark Plug

  • 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.

5. Harley Electra Glide Classic Performance Spark Plugs Pair repl. OEM# 6R12

  • Conventional style spark plugs, available in OEM heat ranges
  • Plugs have a unique look with a black ceramic body
  • Insulator is made of 95% pure alumina, features strong resistance to heat shock and superior insulation.
  • Sold in Pairs
  • Harley Electra Glide Classic

6. NGK # 6046 Iridium Spark Plugs — DCPR7EIX — for Harley-Davidson Twin Cam and XL — 4 PCS NEW

  • NGK 6046 now s/s to NGK 97637
  • NGK 97637 DCPR7EIX is the Newest Number
  • NGK is the world’s largest supplier of OEM spark plugs
  • Often specified as original equipment, NGK spark plugs are the best combination of performance and longevity.
  • This Listing is for 4 Spark Plugs

7. NGK Iridium IX DCPR7EIX Spark Plugs for Buell

8. Autolite 103-4PK Copper Resistor Spark Plug

  • 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
  • Fit type: Vehicle Specific

9. Accel 2418 Spark Plugs (Pair) 6R12 for Harley Davidson Twin Cam

  • Accel High Performance spark plugs for Harley-Davidson
  • Suitable for all Harley Davidson Twin Cam 1450/1550cc models from 1999 up
  • Spark plugs produce a larger spark for more power at high RPMs.
  • Accel number 2418, replaces OEM part 6R12
  • Sold in pairs

10. Iridium Performance Spark Plugs Pair for Harley Softail Slim Twin Cam repl. Harley# 6R12

  • The ultimate in spark plug technology and performance
  • Iridium electrode is smaller than a standard electrode; requires less voltage
  • Hotter spark and extended spark plug service life compared to conventional plugs
  • Has the distinctive black ceramic with and gold-colored corrosion-protected coating on the metal shell.
  • Sold in pairs and replaces Harley# 6R12 / NGK# DCPR7EIX

How We Pick the Spark Plugs For Harley 103 - Buying Guide


Don't let the stress of finding the perfect Spark Plugs For Harley 103 keep you up at night- focus on these key factors to make the best decision possible. Shopping for a product can be overwhelming, but don't worry, we're here to help. Narrow down your choices by considering these factors, and you'll be sure to find a quality product that you love.

Product Brand:


Our emotional attachments to certain brands can bias our decision-making. This method can yield positive or negative results, but there is no denying the appeal of relying on well-known brands. Having enough money to make choices easy is a luxury not everyone can afford, but please note that not all brands are created equal. Choosing the right product from the right brand is essential.

Understand Your Needs


The first step is to understand your needs and requirements. If you're not clear on what you need, you could end up investing in the wrong products at the wrong time. That's why it's important to take some time to think about your requirements. To make it easier, make a short list of your needs. This simple decision will help you to better estimate costs. Only after that can you be sure of your priorities.

Quality and Longevity:

Budget vs. Cost:


Before making a purchase, it is essential to consider your budget. The price of a product can vary greatly, and factors such as the quality of materials, manufacturing costs, and shipping can all affect the final cost. If you need a high-quality product, be prepared to spend more. Budget is an important factor in any decision to buy.

Warranty and Return Policy: Many manufacturers are making high-quality products and letting us know about them through creative advertisements. However, the matter of warranty and after-sales service is often overlooked and can make a big difference.

FAQs and Customer:


FAQs and customer reviews can save you time. Frequently asked questions come up all the time, and customers often share their experiences with products in reviews. Reading these before you buy something can save you time and hassle.

Final Thought


At the end of the day, it's important to consider whether the price you're paying for Spark Plugs For Harley 103 is rational, based on the value it provides. If it makes you happy and meets your needs, then it's probably worth it.

We hope you've enjoyed this buying guide and that it's helped you find the perfect Best Spark Plugs For Harley 103. Your satisfaction is our top priority, and we're happy to help you make the best purchase decision possible.

Join The Discussion