NGK 6046 Iridium Spark Plugs DCPR7EIX 4 PCS - Better Start

In this review of the NGK 6046 Iridium spark plugs (now superseded to NGK 97637 DCPR7EIX) the bottom line is simple: these plugs are for riders who want a reliable, longer lasting replacement for stock units on Harley-Davidson Twin Cam and XL engines. The reviewer found the most persuasive reason to buy is the combination of improved starting and steady idling delivered by NGK's iridium design, which customers consistently praise for performance and durability. This listing is for a set of four plugs, making it suitable for a single engine service.

Key Features

• Newest part number: The NGK 6046 has been updated to NGK 97637 DCPR7EIX, ensuring buyers receive the current production part.
• Iridium center electrode: The iridium tip improves ignition reliability and offers better wear resistance compared with standard plugs.
• OEM pedigree: NGK is the world's largest OEM spark plug supplier, so fit and compatibility with Harley-Davidson Twin Cam and XL engines is commonly specified.
• Performance gains: Riders report quicker starts and smoother idling, suggesting real-world improvements in ignition performance.
• Pack size: This listing includes four spark plugs, enough for one complete service on most V-twin engines.

Who It's For

This product is aimed at Harley-Davidson owners and professional mechanics who want a direct-replacement spark plug with strong claims for longevity and stable combustion. It is a good choice for riders noticing slower starts, rough idle, or reduced throttle response who want an easy parts swap that often performs better than stock plugs.

Those who should look elsewhere include owners who require a specialized heat range or custom electrode configuration not implied by the OEM cross-reference; advanced tuners seeking non-standard gap setups or race-only plugs may prefer purpose-built options rather than an OEM-style iridium replacement.

Pros & Cons

Pros

• Improved start time and smoother idle as reported by multiple customers.
• Durable iridium tip that tends to outlast standard plugs, offering good value for money.
• Direct compatibility with many Harley-Davidson Twin Cam and XL models, matching OEM expectations.

Cons

• Limited specification details in the listing beyond the updated part number, so customers should confirm fitment for uncommon model years.

Specifications

Brand	NGK
Part number (superseded)	6046 now s/s to 97637
Current part number	DCPR7EIX (NGK 97637)
Quantity	4 spark plugs
Application	Compatible with Harley-Davidson Twin Cam and XL engines
Type	Iridium spark plug

Our Verdict

The NGK 6046 / 97637 DCPR7EIX iridium plugs are a practical, cost-effective upgrade for Harley owners seeking crisper starts and steadier idle without changing other ignition components. Given NGK's OEM history and the positive customer feedback on performance and longevity, these four-pack plugs represent good value for routine replacement on compatible Twin Cam and XL models.

Frequently Asked Questions

Are these the latest NGK part number?
Yes, the listing notes NGK 6046 is now superseded to NGK 97637 DCPR7EIX and the newest number is shipping.

Will these fit my Harley-Davidson Twin Cam?
They are stated as compatible with Twin Cam and XL engines, but confirm your specific model year and OEM plug spec before purchase.

How many plugs are included?
This listing is for four spark plugs, sufficient for a single engine service on most V-twin applications.