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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Iridium IX DCPR7EIX Spark Plugs Compatible with 1999-2016 Harley Davidson Twin Cam (Pair)

Product ID: 12508559

Details

Brand
NGK
Core Material
Nickel
Number of Items
2
Top Material Type
Metal
Vehicle Service Type
Motorcycle

⚡Up to 3HP power boost

🔧Pre-gapped for instant install

🛡️Enhanced anti-corrosion metal shell

€ 45.27

Duties & taxes included

In stock

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Description

⚡ Ignite your Harley’s true potential—ride with the spark that leads the pack!

POWER SURGE READY - Unlock up to 3 extra horsepower with every ride
PRECISION PRE GAPPED - Skip the hassle—plug and play for peak performance
NEXT GEN IRIDIUM TECH - 25% smaller electrode means faster, cleaner ignition
EXTENDED IGNITION LIFE - Ultra-small center electrode reduces voltage stress for longer system health
DURABILITY MEETS DESIGN - New metal shell plating fights corrosion like a pro

The NGK Iridium IX DCPR7EIX spark plugs deliver cutting-edge ignition technology tailored for 1999-2016 Harley Davidson Twin Cam models. Featuring a 25% smaller iridium electrode and ultra-small center design, these plugs reduce voltage requirements, extend ignition system life, and provide up to 3 horsepower gain. Pre-gapped for effortless installation and equipped with a new anti-corrosion metal shell, they ensure durable, high-performance rides every time.

Specifications

ASIN	B003BUCNNS
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#2,660 in Automotive ( See Top 100 in Automotive ) #10 in Automotive Replacement Spark Plugs
Brand Name	NGK
Compatible with Vehicle Type	Motorcycle
Core Material	Nickel
Customer Reviews	4.7 4.7 out of 5 stars (4,982)
Included Components	NGK DCPR7EIX
Item Type Name	SPARK_PLUG
Item Weight	1.44 ounces
Manufacturer	NGK
Manufacturer Part Number	DCPR7EIX
Manufacturer Warranty Description	Manufacturer Warranty
Model Number	DCPR7EIX
Number of Items	2
Top Material Type	Metal
UPC	700155016542
Unit Count	2 Count

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