NGage DH7RTII-8 Double Iridium Spark Plug – Classic 350 Reborn, Meteor, Hunter, Bullet 350 & Goan Classic 350

NGage DH7RTII-8 Double Iridium Spark Plug for Royal Enfield J-Series 350

NGage DH7RTII-8 is a premium Double Iridium spark plug for Royal Enfield's current J-Series / J-Platform 350 motorcycle family. NGage Master Catalogue V4.9 directly lists Classic 350 Reborn, Meteor 350, Hunter 350 and Bullet 350 Reborn for DH7RTII-8, while NGage's dedicated J-Platform 350 performance spark kit confirms the same DH7RTII-8 plug for the Goan Classic 350 as well.

This is the plug buyers may search for as Classic 350 iridium spark plug, Meteor 350 spark plug, Hunter 350 performance spark plug, Bullet 350 J-Series spark plug, Goan Classic 350 spark plug, J-Series 350 iridium plug or simply DH7RTII-8.

Quick Product Details

Confirmed Compatibility

Goan Classic 350 – Why It Is Included

The standalone DH7RTII-8 compatibility page in NGage V4.9 lists Classic 350 Reborn, Meteor 350, Hunter 350 and Bullet 350 Reborn. NGage's newer NGAGE-HPKIT-J350 complete ignition kit explicitly adds Goan Classic 350 and states that the spark plug supplied inside that kit is DH7RTII-8.

That gives manufacturer-level evidence for Goan Classic 350 without guessing from engine similarity alone.

Double Iridium – What Does It Mean?

NGage describes the Double Iridium range as using Iridium at both the firing pin and electrode pin. The manufacturer publishes a 0.6 mm Iridium tip and promotes the construction for improved ignitability and durability.

NGage also describes a 360-degree laser-welding process for the Double Iridium tips. The catalogue positions this design as producing a more consistent / omni-directional ignition event compared with the flat ignition pattern used in its single-tip comparison.

98% Pure Copper Core

NGage states that the plug uses a 98% pure copper core. According to the manufacturer, this supports efficient heat dissipation, reliable starting and control of spark-plug operating temperature.

High-Grade Ceramic Insulator

NGage specifies a high-grade alumina silicate ceramic insulator. The manufacturer positions this material as a robust electrical insulator intended to minimise dielectric punch-through / spark leakage through the ceramic body.

Manufacturer-Published Benefits

NGage markets its Double Iridium range around potential benefits including:

• Better combustion
• Reduced misfires
• Improved acceleration / throttle response
• Easier starting in cold or wet conditions
• Improved fuel-efficiency potential
• More stable idle
• Longer service-life potential versus conventional plug designs

These are manufacturer performance claims, not guaranteed gains. A spark plug cannot correct every engine problem, and actual results depend on the complete ignition, fuelling and mechanical condition of the motorcycle.

Will It Increase Power or Mileage?

NGage describes more efficient combustion, improved acceleration and better fuel-economy potential for the Double Iridium design, but no fixed BHP or km/l gain is published for DH7RTII-8 in the V4.9 compatibility page.

For that reason, this listing does not promise a specific horsepower or mileage increase. On a correctly running motorcycle, the most realistic buyer expectation is consistent ignition performance, durable electrodes and the possibility of smoother starting / throttle response compared with a worn conventional plug.

Up to 1,00,000 km – Understand the Claim Correctly

NGage advertises a maximum life of up to 1,00,000 km with limited warranty for its Double Iridium range.

This is a manufacturer maximum-life claim, not a guaranteed replacement interval. Follow Royal Enfield's inspection / replacement schedule and replace the spark plug earlier if its actual condition requires it.

J-Series 350 vs Older UCE 350 – Do Not Mix Them Up

Royal Enfield has sold the names Classic 350 and Bullet 350 across completely different engine generations.

If you are unsure whether your Classic / Bullet is J-Series or UCE, confirm the model year, engine generation or existing plug before ordering.

Important NGage Royal Enfield Spark-Plug Cross-Reference

This cross-reference is useful because NGage uses several visually similar Double Iridium part numbers. Do not substitute one code for another based only on brand or engine capacity.

Plug-Only vs Complete NGage J350 Ignition Kit

This listing is for 1 × DH7RTII-8 spark plug only.

NGage also offers the complete NGAGE-HPKIT-J350 for the same J-Series family. That full kit contains:

• 1 × DH7RTII-8 Double Iridium spark plug
• 1 × CB05F-R 5 kΩ resistor spark cap
• 1 × NGage ultra-low-resistance racing HT / spark cable

If your existing cap and HT lead are healthy, the plug-only option may be all you need for a spark-plug replacement. If you specifically want the complete spark-delivery upgrade, use the J350 performance ignition kit instead.

Performance Pairing – J-Series Hyper Flow Air Filter

For Meteor 350, Classic 350 Reborn and Hunter 350, Under The Hood also stocks the dedicated NGAGE-004METE350 Hyper Flow washable performance air filter.

View NGage Hyper Flow Air Filter for Meteor / Classic 350 Reborn / Hunter 350

Bullet 350 and Goan Classic 350 are not automatically included in that air-filter fitment. The spark plug may be shared across the J-Series family while the air-filter element can differ by model.

When Should a Spark Plug Be Inspected?

A workshop may inspect the plug when the motorcycle shows symptoms such as:

• Hard starting
• Intermittent misfire
• Rough or unstable idle
• Weak acceleration
• Plug fouling
• High mileage / scheduled service

These symptoms do not automatically prove the spark plug is defective. Battery voltage, ignition coil, injector, fuel quality, wiring, sensors, compression and valve clearances can produce similar symptoms.

Installation / Return-Prevention Notes

• Confirm exact part number DH7RTII-8.
• Confirm the motorcycle is one of the supported J-Series 350 applications.
• Install only on a cool engine.
• Clean the area around the existing spark plug before removal.
• Start the new plug by hand to reduce cross-threading risk.
• Use the Royal Enfield workshop-specified tightening torque for your exact motorcycle.
• Do not over-tighten.
• Do not alter the electrode gap unless specifically required by the motorcycle / plug manufacturer.
• Inspect the plug cap and ignition connection while servicing.

What You Will Receive

1 × NGage DH7RTII-8 Double Iridium Spark Plug

Resistor cap, HT cable, ignition coil, air filter and other ignition / performance parts are not included in this plug-only listing.

Buyer FAQs

Does DH7RTII-8 fit Royal Enfield Classic 350 Reborn?
Yes. NGage V4.9 directly lists Reborn Classic 350 for DH7RTII-8.

Does it fit Meteor 350?
Yes. Meteor 350 is directly listed by NGage.

Does it fit Hunter 350?
Yes. Hunter 350 is directly listed by NGage.

Does it fit the new Bullet 350?
Yes, for the new J-Series / Reborn Bullet 350. Do not confuse it with the older UCE Bullet 350.

Does DH7RTII-8 fit Goan Classic 350?
Yes. NGage's J-Platform 350 performance kit explicitly lists Goan Classic 350 and confirms that the included spark plug is DH7RTII-8.

Does it fit the old Classic 350 UCE?
No. The old UCE Classic 350 uses a different spark-plug application.

Does it fit Himalayan 450 or Guerrilla 450?
No according to NGage V4.9. NGage lists those models under BN8RTIIA-9.

Does it fit Himalayan 411?
No according to the NGage chart used here. Himalayan 411 is listed under B8RII-8.

Is DH7RTII-8 Double Iridium?
Yes. NGage describes its Double Iridium design as using Iridium at both the firing pin and electrode pin.

Is it Made in Japan?
Yes. NGage's J350 spark-kit page identifies the DH7RTII-8 plug as from Japan, and the Double Iridium range artwork is marked Made in Japan.

What is the Iridium tip size?
NGage publishes a 0.6 mm Iridium tip for the Double Iridium range.

How many plugs do I receive?
1 spark plug. The J-Series 350 motorcycles listed here use one plug in this NGage application.

What is the MRP?
₹900 inclusive of taxes.

Will it definitely improve mileage or power?
No fixed gain is guaranteed. NGage markets improved combustion, acceleration and fuel-efficiency potential, but results depend on the full engine and ignition system.

What is NGage's maximum-life claim?
NGage advertises up to 1,00,000 km with limited warranty. This should be treated as a maximum manufacturer claim, not a guaranteed replacement interval.

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