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NGK

Q: 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.

Q: Is this 6r12, if so why does it not say so ?

Because these plugs are IX DCPR7EIX 99 TO 16 HARLEY-DAVIDSON

Product ID: 12508559

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Details

Brand
NGK
Core Material
Nickel
Thread Size
12mm
Top Material Type
Metal
Vehicle Service Type
Motorcycle

⚡Ultra-small electrode for efficient ignition

🔧Pre-gapped for perfect fit & performance

🛡️Enhanced anti-corrosion metal shell plating

Frequently Bought Together

NGK Iridium IX DCPR7EIX Spark Plugs Compatible with 1999-2016 Harley Davidson Twin Cam (Pair)

K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils: Fits Select Harely Davidson, Buell Motorcycles, KN-171C

K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils: Fits Select Harely Davidson Motorcycles, KN-171B

Description

⚡ Ignite your Harley’s soul with NGK Iridium IX – where power meets precision.

PRECISION PRE GAPPED - Ready to install, saving you time and ensuring optimal spark every ride.
IRIDIUM IX TECHNOLOGY - Industry-leading ultra-fine electrode reduces voltage needs, boosting ignition efficiency and longevity.
LIGHTWEIGHT COMPACT - Sleek design (3.31 x 0.94 x 0.83 inches) and just 1.44 oz per plug for minimal impact on engine performance.
CORROSION RESISTANT SHELL - New metal plating guards against rust, keeping your spark plugs durable through every mile.
TAILORED FOR HARLEY TWIN CAM - Specifically engineered for 1999-2016 Harley Davidson Twin Cam models for seamless compatibility.

NGK Iridium IX DCPR7EIX spark plugs deliver cutting-edge ignition performance with an ultra-small iridium center electrode that reduces voltage requirements and extends ignition system life. Pre-gapped for hassle-free installation, these plugs feature a corrosion-resistant metal shell plating and are specifically designed for 1999-2016 Harley Davidson Twin Cam motorcycles, ensuring perfect fit and reliable power every ride.

Specifications

Brand	NGK
Core Material	Nickel
Thread Size	12mm
Top Material Type	Metal
Vehicle Service Type	Motorcycle
Automotive Fit Type	Vehicle Specific Fit
UPC	700155016542
Manufacturer	NGK
Model	NGK DCPR7EIX
Item Weight	1.44 ounces
Product Dimensions	3.31 x 0.94 x 0.83 inches
Item model number	DCPR7EIX
Is Discontinued By Manufacturer	No
Exterior	Painted
Manufacturer Part Number	DCPR7EIX
Position	Front, Rear

Have a Question? See What Others Asked

Should I gap to my owners manual spec or are they designed to work with the smaller pre-gap they came with?

Are these 14mm threads?

Do you get 1 or 2 spark plugs in this price

Is this 6r12, if so why does it not say so ?

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