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 boost

🔧Pre-gapped for perfect fit

🛡️Enhanced anti-corrosion plating

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฿2454

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Ignite your ride with precision power and unmatched durability!

IRIDIUM EDGE TECH - Ultra-small 25% smaller iridium electrode means stronger, more consistent sparks.
POWER SURGE READY - Unlock up to 3 extra horsepower instantly for that edge on the road.
PRECISION PRE GAPPED - Install with confidence—perfect gap ensures flawless ignition every time.
TAILORED FOR TWIN CAM - Specifically engineered for 1999-2016 Harley Davidson Twin Cam models—fit and performance guaranteed.
DURABILITY MEETS DESIGN - New metal shell plating resists corrosion, extending plug life and reliability.

NGK Iridium IX DCPR7EIX spark plugs deliver up to 3HP performance gains with an ultra-small iridium electrode that reduces voltage needs and extends ignition life. Pre-gapped for hassle-free installation, these plugs feature advanced anti-corrosion metal plating and are engineered specifically for 1999-2016 Harley Davidson Twin Cam motorcycles, ensuring a perfect fit and reliable, smooth throttle response.

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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