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

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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)

Product ID: 334292066

Details

Brand
NGK
Core Material
Iridium
Thread Size
12mm
Top Material Type
Metal
Vehicle Service Type
Motorcycle

⚡Up to 3HP power boost

🔧Pre-gapped for perfect fit

🛡️Enhanced anti-corrosion shell

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Description

⚡ Ignite your Harley’s true potential with NGK Iridium IX!

IRIDIUM EDGE - 25% smaller iridium electrode means lower voltage demand and longer ignition life.
OEM TRUSTED FIT - Designed specifically for 1999-2016 Harley Davidson Twin Cam models for seamless performance.
CORROSION SHIELD - New metal shell plating resists rust and wear, keeping your ride reliable.
POWER SURGE READY - Unlock up to 3 extra horsepower for your Harley’s Twin Cam engine.
PRECISION PRE GAPPED - No hassle installation with factory-set gap for optimal ignition.

The NGK Iridium IX DCPR7EIX spark plugs deliver cutting-edge ignition technology with a 25% smaller iridium electrode that reduces voltage needs and extends ignition system life. Pre-gapped for hassle-free installation, these plugs provide up to 3 horsepower gain and feature a new anti-corrosion metal shell plating, making them the perfect OEM fit for 1999-2016 Harley Davidson Twin Cam motorcycles.

Specifications

ASIN	B003BUCNNS
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#187,112 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #1,310 in Ignitions
Brand	NGK
Brand Name	NGK
Compatible with Vehicle Type	Motorcycle
Core Material	Iridium
Country of Origin	USA
Customer Reviews	4.7 out of 5 stars 4,647 Reviews
Item Type Name	SPARK_PLUG
Item Weight	41 g
Manufacturer	NGK
Manufacturer Part Number	DCPR7EIX
Model	DCPR7EIX
Thread Size	12mm
Top Material Type	Metal
UPC	700155016542
Unit Count	2.0 Count
Vehicle Service Type	Motorcycle
What Is In the Box	NGK DCPR7EIX

Reviews

B**6

4.12.2023

R**.

6.11.2023

M**M

10.04.2025

J**C

10.02.2026

R**T

10.09.2024

D**L

31.03.2026

K**E

22.01.2026

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