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 Compatible with 1999-2016 Harley Davidson Twin Cam (Pair)

NGK 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

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€ 38.20

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Description

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

POWER SURGE READY - Unlock up to 3 extra horsepower with cutting-edge iridium tech.
CORROSION NOT HERE - New metal shell plating resists rust and keeps your ride reliable season after season.
PLUG PLAY PRECISION - Comes pre-gapped for hassle-free, perfect ignition every time.
TRUSTED LEADERS EDGE - From NGK, the industry pioneer with 4.7-star rave reviews and proven performance.
MINI ELECTRODE MEGA IMPACT - Ultra-small 25% smaller iridium electrode slashes voltage needs and extends ignition life.

NGK Iridium IX DCPR7EIX spark plugs deliver up to 3HP gain with ultra-small iridium electrodes that reduce voltage requirements and extend ignition system life. Pre-gapped for easy installation, these plugs feature a new anti-corrosion metal shell plating, ensuring durability and peak performance for 1999-2016 Harley Davidson Twin Cam models.

Specifications

ASIN	B003BUCNNS
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#2,273 in Automotive ( See Top 100 in Automotive ) #9 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 (4,899)
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
Top Material Type	Metal
UPC	700155016542
Unit Count	2.0 Count

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