NGK Iridium Spark Plug Set for Royal Enfield Himalayan 411 (BS3, BS4, BS6) Interceptor 650 (BS6), Interceptor 650 Twin (BS6), Continental GT650 Twin (BS6) Part No. - CR7EIX Set of 2. SKU - CR7EIX-S
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Product Description
Ultra-Fine 0.6mm Iridium Tip: Extremely durable iridium alloy construction offers an exceptionally high melting point, maintaining precise gap distance over long service intervals.
BS-6 Ready Technology: Engineered to meet the stringent ignition requirements of modern BS6 fuel-injected engines for clean burning and lower tailpipe emissions.
Trivalent Metal Plating: Superior anti-corrosion and anti-seizing properties prevent thread rust and heat-sticking in aluminum cylinder heads.
Enhanced Throttle Response & Anti-Fouling: Thermo-edge design resists carbon buildup, ensuring reliable firing during low-speed city crawling and high-speed highway touring.
Complete Pair (Set of 2): Packaged conveniently as a 2-piece set to cover both left and right cylinder ignitions on 650 Twins or provide a primary/spare setup for 411 models.
Ignite your engine’s full potential and enjoy smoother power delivery across every RPM with the NGK Iridium Spark Plug Set of 2 for Royal Enfield Himalayan 411 & 650 Twins (SKU: CR7EIX-S). Specifically engineered for demanding high-torque single and parallel-twin powertrains, these NGK Iridium IX spark plugs feature an ultra-fine 0.6mm laser-welded iridium alloy center electrode. Designed to require lower voltage while generating an extremely hot, stable spark flame kernel, this 2-pack upgrade eliminates sluggish starts, improves fuel combustion efficiency, and ensures sharp throttle pickup across all BS3, BS4, and modern BS6 models.
Standard nickel spark plugs erode quickly under high thermal stress, resulting in widened plug gaps, engine misfires, rough idling, and poor fuel efficiency. Upgrading to the CR7EIX-S NGK Iridium IX spark plug set restores effortless push-button starts, stabilizes idle quality, and ensures crisp acceleration for your Royal Enfield adventure and twin-cylinder machines.
Recognizing Spark Plug Wear & Failure Symptoms
Difficult Cold Starts: Prolonged cranking before the engine fires up, especially in cold weather or after extended parking.
Engine Misfires & Hesitation: Stuttering or unexpected power drops during sudden throttle application or heavy load acceleration.
Rough Idling & Engine Vibrations: Unstable engine RPM at standstill accompanied by erratic exhaust popping.
Decreased Fuel Efficiency: Increased petrol consumption caused by unburnt fuel passing through the cylinder due to weak spark ignition.
Black Carbon Fouling on Old Plugs: Heavy soot accumulation on old plug tips indicating incomplete combustion or improper heat range.
Maintenance & Installation Best Practices
Verify Preset Gap:
Inspect the iridium center electrode gap carefully before installation; avoid forcing feeler gauges directly against the delicate 0.6mm iridium tip.Hand-Thread First: Always screw SKU CR7EIX into the cylinder head threads by hand until seated flush before using a plug spanner to avoid cross-threading aluminum threads.
Correct Torque Spec: Torque to manufacturer specification (typically 10–12 Nm for 10mm thread diameter plugs in aluminum heads); do not over-tighten.
Use Spark Plug Boot Grease: Apply a tiny dab of dielectric silicone grease inside the spark plug cap/boot to prevent high-voltage flashover and ease future removal.
Technical Specifications
| Product Type | Motorcycle Performance Iridium Spark Plug Set |
| Manufacturer / Brand | NGK Spark Plugs |
| Part Number / Type | CR7EIX (Order Code Set SKU: CR7EIX-S) |
| Quantity | Set of 2 Plugs (Left-Hand & Right-Hand Side Application) |
| Center Electrode Material | Ultra-Fine Iridium Alloy (0.6mm) |
| Ground Electrode | Tapered Cut Nickel Alloy |
| Thread Diameter / Reach | 10 mm / 19 mm (3/4") |
| Hex Size | 16 mm (5/8") |
| Emissions Standard | BS-3, BS-4, and BS-6 Ready |
| OEM / Manufacturer Part Code | CR7EIX (Packaged Set SKU: CR7EIX-S) |
| Compatible Bike Models | Royal Enfield Interceptor 650 BS6 / Twin BS6 (Requires 2 Plugs), Royal Enfield Continental GT 650 BS6 / Twin BS6 (Requires 2 Plugs), Royal Enfield Himalayan 411 (BS3, BS4, BS6 variants), Royal Enfield Scram 411 (BS6) |
