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 for 1999-2016 Harley Davidson Twin Cam (Pair)

Product ID: 254497229

Details

Brand
NGK
Core material
Nickel
Thread size
12mm
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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Description

⚡ Ignite your ride with NGK Iridium IX – where power meets precision.

IRIDIUM EDGE TECH - Ultra-small 25% smaller iridium electrode slashes voltage needs and extends ignition life.
POWER SURGE READY - Unlock up to 3 extra horsepower instantly for your Harley’s Twin Cam engine.
PRECISION PRE GAPPED - Arrives perfectly pre-set to save you time and ensure flawless ignition every ride.
OEM TRUSTED PERFORMANCE - Specifically engineered for 1999-2016 Harley Davidson Twin Cam models, delivering smooth starts and reliable power.
CORROSION RESISTANT ARMOR - New metal shell plating guards against rust, keeping your spark plugs race-ready season after season.

NGK Iridium IX DCPR7EIX spark plugs are engineered for 1999-2016 Harley Davidson Twin Cam motorcycles, featuring a 25% smaller iridium electrode that reduces voltage requirements and extends ignition system life. Pre-gapped for perfect installation, these plugs deliver up to 3 horsepower gains and boast enhanced anti-corrosion metal shell plating for long-lasting durability.

Specifications

ASIN	B003BUCNNS
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#7,530 in Automotive ( See Top 100 in Automotive ) #40 in Automotive Performance Spark Plugs
Brand Name	NGK
Compatible with Vehicle Type	Motorcycle
Core Material	Nickel
Customer Reviews	4.7 4.7 out of 5 stars (4,837)
Included Components	NGK DCPR7EIX
Item Type Name	SPARK_PLUG
Item Weight	41 g
Manufacturer	NGK
Manufacturer Part Number	DCPR7EIX
Model Number	DCPR7EIX
Number of Items	2
Thread Size	12mm
Top Material Type	Metal
UPC	700155016542
Unit Count	2.0 Count

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B/.118

Duties & taxes included

In stock

Sold byAmazon PanamaDelivered 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 Panama.

Secure transaction

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