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) | Replaces EX12S HD6R12 31600106 32192-10 32320-91 MS851327 MZ602067 09482-00479 1A61-18-110 1UNF-18-110 BY480-DCPR7.

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 ride with NGK Iridium – where power meets precision!

POWER SURGE READY - Unlock up to 3 extra horsepower with cutting-edge iridium tech.
CORROSION NOT HERE - New metal shell plating guards against rust and wear for long-lasting performance.
PLUG PLAY PRECISION - Comes pre-gapped for hassle-free, perfect ignition every time.
TRUSTED LEADERS EDGE - From NGK, the industry pioneer trusted by pros and enthusiasts alike.
MINI ELECTRODE MEGA IMPACT - Ultra-small 25% smaller iridium electrode slashes voltage needs and extends ignition life.

NGK Iridium IX DCPR7EIX spark plugs deliver superior 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 for easy installation and equipped with a new anti-corrosion metal shell, they provide up to 3HP power gains and long-lasting durability trusted by thousands of riders.

Specifications

ASIN	B003BUCNNS
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#2,426 in Automotive ( See Top 100 in Automotive ) #10 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 (4,988)
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
Number of Items	2
Top Material Type	Metal
UPC	700155016542
Unit Count	2 Count

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฿2462

Duties & taxes included

In stock

Sold byAmazon ThailandDelivered 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 Thailand.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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