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 gain

🔧Pre-gapped for instant install

🛡️Enhanced anti-corrosion plating

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Description

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

PRECISION PRE GAPPED - Ready to install out of the box—no guesswork, just pure ignition power.
POWER BOOST PERFORMANCE - Unlock up to 3 extra horsepower and feel the difference on every ride.
TRUSTED INDUSTRY LEADER - NGK’s top-rated spark plugs, favored by thousands of Harley Davidson riders.
CORROSION RESISTANT SHELL - New metal plating keeps your plugs pristine, ride after ride.
ULTRA SLIM IRIDIUM ELECTRODE - 25% smaller than platinum for lower voltage needs and longer ignition life.

NGK Iridium IX DCPR7EIX spark plugs deliver advanced ignition technology with a 25% smaller iridium electrode, pre-gapped for easy installation, and enhanced anti-corrosion metal plating. Compatible with 1999-2016 Harley Davidson Twin Cam models, these plugs boost engine performance by up to 3 horsepower while extending ignition system life.

Specifications

ASIN	B003BUCNNS
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#2,490 in Automotive ( See Top 100 in Automotive ) #8 in Automotive Replacement Spark Plugs
Brand	NGK
Brand Name	NGK
Compatible with Vehicle Type	Motorcycle
Core Material	Nickel
Customer Reviews	4.7 out of 5 stars 4,941 Reviews
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
Number of Items	2
Top Material Type	Metal
UPC	700155016542
Unit Count	2.0 Count
Vehicle Service Type	Motorcycle

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€ 51.56

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered 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 Cyprus.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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Customer service was outstanding when I had questions about the product.

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