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 shell

166611Fr

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Description

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

IRIDIUM EDGE TECH - Ultra-small 25% smaller iridium electrode means less voltage needed and longer ignition life.
POWER SURGE READY - Unlock up to 3 extra horsepower and feel the difference on every ride.
TRUSTED HARLEY FIT - Specifically engineered for 1999-2016 Harley Davidson Twin Cam models—performance tailored to your bike.
PRECISION PRE GAPPED - Skip the hassle—these plugs come perfectly pre-set for flawless ignition.
CORROSION RESISTANT ARMOR - New metal shell plating guards against rust, keeping your ride reliable season after season.

NGK Iridium IX DCPR7EIX spark plugs deliver cutting-edge ignition technology with a 25% smaller iridium electrode that reduces voltage needs and extends ignition system life. Pre-gapped for easy installation and featuring a new anti-corrosion metal shell, these plugs are designed specifically for 1999-2016 Harley Davidson Twin Cam motorcycles, offering up to 3 horsepower gain and unmatched durability.

Specifications

ASIN	B003BUCNNS
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#2,996 in Automotive ( See Top 100 in Automotive ) #9 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 4,937 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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166611Fr

Duties & taxes included

In stock

Sold byAmazon CongoDelivered 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 Congo.

Secure transaction

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