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)

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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Description

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

POWER SURGE READY - Unlock up to 3 extra horsepower and feel the difference on every ride.
CORROSION NOT HERE - New metal shell plating fights rust and wear, keeping your plugs pristine mile after mile.
PLUG PLAY PRECISION - Comes pre-gapped for hassle-free installation—get back on the road faster.
TRUSTED LEADERS EDGE - From NGK, the industry pioneer with 4.7-star reviews and proven performance.
NEXT GEN IGNITION TECH - Ultra-small iridium electrode reduces voltage needs, extending your ignition system’s lifespan.

NGK Iridium IX DCPR7EIX spark plugs deliver cutting-edge ignition performance for 1999-2016 Harley Davidson Twin Cam models. Featuring a 25% smaller iridium electrode, these plugs reduce voltage requirements and extend ignition system life. Pre-gapped and equipped with a corrosion-resistant metal shell, they provide up to 3 horsepower gain and reliable, long-lasting performance trusted by thousands of riders.

Specifications

ASIN	B003BUCNNS
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#2,621 in Automotive ( See Top 100 in Automotive ) #8 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 (4,936)
Included Components	NGK DCPR7EIX
Item Type Name	SPARK_PLUG
Item Weight	0.09 Pounds
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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₩65649

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered 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 South Korea.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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