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 instant install

🛡️Enhanced anti-corrosion shell

Bs.846

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Description

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

POWER SURGE READY - Unlock up to 3 extra horsepower and feel the difference on every ride.
PLUG PLAY PRECISION - Comes pre-gapped for hassle-free installation—get back on the road faster.
TAILORED FOR TWIN CAM - Specifically engineered for 1999-2016 Harley Davidson Twin Cam models—perfect fit, peak performance.
NEXT GEN IGNITION TECH - Ultra-small iridium electrode reduces voltage needs, extending your ignition system’s lifespan.
CORROSION PROOF CONFIDENCE - New metal shell plating guards against rust and wear, keeping your plugs race-ready.

NGK Iridium IX DCPR7EIX spark plugs deliver cutting-edge ignition technology with a 25% smaller iridium electrode, boosting horsepower by up to 3HP. Pre-gapped for easy installation and featuring a corrosion-resistant metal shell, these plugs are engineered specifically for 1999-2016 Harley Davidson Twin Cam motorcycles, ensuring optimal performance and extended ignition system life.

Specifications

ASIN	B003BUCNNS
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#2,803 in Automotive ( See Top 100 in Automotive ) #7 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 5,005 Reviews
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
Vehicle Service Type	Motorcycle

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Bs.846

Duties & taxes included

In stock

Sold byAmazon BoliviaDelivered 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 Bolivia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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