Description
The NGage DH7RTII-8 Double Iridium Spark Plug is designed for Royal Enfield motorcycles built on the J-Series 350 engine platform. This includes the latest-generation 350 cc models introduced with revised engine architecture, fuel injection systems, and updated combustion characteristics.
Manufactured in Japan, the DH7RTII-8 belongs to NGage’s double iridium spark plug lineup and is intended for use in both BS4 and BS6 compliant motorcycles, as stated by the manufacturer. This spark plug is engineered as a direct replacement component for the Royal Enfield J-Series engines listed below.
Designed for Royal Enfield J-Series 350 Platform
Royal Enfield’s J-Series 350 platform underpins multiple motorcycles that share a common engine design and ignition requirements. NGage lists the DH7RTII-8 spark plug specifically for these motorcycles, allowing them to be grouped accurately under a single platform-based listing.
The J-Series platform includes:
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Revised cylinder head design
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Updated combustion chamber characteristics
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Fuel-injected engines across BS4 and BS6 production
The DH7RTII-8 spark plug is specified by NGage to align with these ignition system requirements.
Double Iridium Spark Plug Construction
NGage classifies the DH7RTII-8 as a Double Iridium spark plug, meaning iridium material is used on both the center electrode and the ground electrode. Iridium is widely used in modern spark plug design due to its high melting point and ability to maintain electrode integrity under repeated ignition cycles.
This construction approach is commonly applied in engines designed for consistent ignition performance across varying operating conditions. NGage does not publish electrode dimensions, gap values, or service interval figures for this model, and none are implied here.
BS4 and BS6 Compatibility
As indicated on NGage’s official product material, the DH7RTII-8 spark plug is compatible with both BS4 and BS6 vehicles. This makes it suitable for Royal Enfield J-Series motorcycles manufactured before and after the BS6 transition, provided the motorcycle is included in the compatibility list.
No claims are made regarding emission reduction, fuel efficiency changes, or performance tuning beyond standard replacement use.
Manufacturing Origin
The DH7RTII-8 spark plug is manufactured in Japan, as stated by NGage. No additional manufacturing process details or certification claims are published for this product.
Intended Use
The NGage DH7RTII-8 is intended for routine replacement during scheduled maintenance or spark plug service intervals recommended by Royal Enfield. It is suitable for everyday road use on compatible motorcycles.
This spark plug is not positioned by NGage as a racing, track-only, or specialized tuning component.
Fitment Accuracy and Model Coverage
Correct spark plug selection is critical for engine operation and longevity. The DH7RTII-8 should be installed only on motorcycles listed in the compatibility section below.
This spark plug is intended specifically for Royal Enfield J-Series 350 motorcycles and should not be assumed compatible with older UCE engines or other Royal Enfield platforms.
Compatibility
Royal Enfield J-Series 350 Motorcycles
Variant Explanation
This listing is for NGage DH7RTII-8 Double Iridium Spark Plug only.
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“Double Iridium” refers to iridium usage on both electrodes.
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This part number represents a single specification intended for J-Series 350 applications.
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No alternate heat ranges or material variants are included in this listing.
Specifications
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Brand: NGage
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Part Number: DH7RTII-8
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Spark Plug Type: Double Iridium
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Vehicle Compatibility: BS4 & BS6
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Country of Manufacture: Japan
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Application: Motorcycle spark plug
Installation / Usage Notes
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Install only on Royal Enfield J-Series 350 motorcycles listed above.
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Follow Royal Enfield service manual torque specifications.
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Install on a cold engine.
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Install as per the motorcycle manufacturer’s service manual torque specification and standard spark plug installation procedure.
