Should I gap to my owners manual spec or are they designed to work with the smaller pre-gap they came with?

Harley Davidson recommends 0.40" gap. As to "You should never gap an iridium plug", NGK's website states for Harley Davidson, these should be gapped at 0.40". I've found many websites stating that if re-gap is needed use care not to damage the electrode or the porcelain center. So, it's not that you should not re-gap, it's that you should be extremely careful.

Is this 6r12, if so why does it not say so ?

Because these plugs are IX DCPR7EIX 99 TO 16 HARLEY-DAVIDSON

Ngk Iridium Ix Dcpr7eix Spark Plugs For 1999 2016 Harley

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

VT8839

Duties & taxes included

In stock

Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vanuatu.

Secure transaction

Description

⚡ Ignite your ride with NGK Iridium IX – where power meets precision.

IRIDIUM EDGE TECH - Ultra-small 25% smaller iridium electrode slashes voltage needs and extends ignition life.
POWER SURGE READY - Unlock up to 3 extra horsepower instantly for your Harley’s Twin Cam engine.
PRECISION PRE GAPPED - Arrives perfectly pre-set to save you time and ensure flawless ignition every ride.
OEM TRUSTED PERFORMANCE - Specifically engineered for 1999-2016 Harley Davidson Twin Cam models, delivering smooth starts and reliable power.
CORROSION RESISTANT ARMOR - New metal shell plating guards against rust, keeping your spark plugs race-ready season after season.

NGK Iridium IX DCPR7EIX spark plugs are engineered for 1999-2016 Harley Davidson Twin Cam motorcycles, featuring a 25% smaller iridium electrode that reduces voltage requirements and extends ignition system life. Pre-gapped for perfect installation, these plugs deliver up to 3 horsepower gains and boast enhanced anti-corrosion metal shell plating for long-lasting durability.

Specifications

Asin	B003BUCNNS
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#35,849 in Automotive (See Top 100 in Automotive) #201 in Automotive Performance Spark Plugs
Brand Name	NGK
Compatible With Vehicle Type	Motorcycle
Core Material	Nickel
Customer Reviews	4.7 4.7 out of 5 stars (4,883) 4.7 out of 5 stars
Included Components	NGK DCPR7EIX
Item Type Name	SPARK_PLUG
Item Weight	0.09 Pounds
Manufacturer	NGK
Manufacturer Part Number	DCPR7EIX
Model Number	DCPR7EIX
Number Of Items	2
Thread Size	12mm
Top Material Type	Metal
Unit Count	2.0 Count
Upc	700155016542

Reviews

User

Working as expected

OEM fit for Harley Davidson Fatboy 103 Ci twin cam engine. Smooth starting and running.

4.12.2023

User

Excellent trustworthy performance

NGK Iridium IX spark plugs are a great upgrade for anyone looking for reliable performance and long-lasting quality. They provide smooth starts, consistent ignition, and dependable performance. Installation was straightforward, and the build quality feels excellent. Overall, these plugs are a solid choice for improving reliability and getting consistent performance from your engine. Definitely a product I would recommend!

27.08.2026

User

Harley-Davidson

Good update for my Harley

10.04.2025

User

Satisfait

Parfait pour ma moto

18.10.2026

User

Originales

Original.

2.09.2026

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

VT8839

Duties & taxes included

In stock

Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vanuatu.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

View all Trustpilot reviews

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

Details

Details

Description

Specifications

Reviews

Common Questions