The Royal Enfield Genuine Spark Plug (Part No. 572327/B), featuring the premium Bosch WQR8DC specification, is a high-performance ignition component designed for the Twinspark Unit Construction Engine (UCE) platform. In Royal Enfield’s dual-plug configuration, this serves as the critical secondary spark plug, working in perfect synchronization with the primary plug to ensure complete fuel combustion within the cylinder head.
the spark plug features a heavy-duty copper core electrode encased in a high-grade ceramic insulator. This construction provides excellent thermal conductivity and prevents electrical misfires. Using the genuine 572327/B spark plug ensures stable engine idling, optimum fuel efficiency, and prevents cold-start issues common with incorrect heat-range generic plugs.
Key Features:
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100% Genuine OEM Hardware: Authentic Royal Enfield replacement component as verified by the official factory label .
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Bosch WQR8DC Specification: Engineered with the precise factory heat range and thread reach required for 350cc/500cc combustion chambers.
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Superior Copper-Core Electrode: Provides lower operating temperatures and reliable spark delivery across the entire RPM band.
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Anti-Seize & Anti-Corrosion Plating: The shell is treated with a specialized nickel plating to prevent the plug from seizing in the aluminum cylinder head.
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Optimized Fuel Combustion: Enhances flame propagation inside the engine block, resulting in smoother throttle response and lower emissions.
Technical Specifications:
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Brand: Royal Enfield Genuine (OEM Bosch)
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Part Number: 572327/B
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Model/Spec: WQR8DC
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Component: Spark Plug (Secondary/Right-Side)
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Material: Ceramic Insulator with Copper Core Electrode
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Country of Origin: India
Motorcycle Compatibility
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Royal Enfield Classic 350 / 500 (All Twinspark UCE Models)
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Royal Enfield Bullet 350 / 500 / ES (Twinspark UCE Models)
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Royal Enfield Thunderbird 350 / 500 / X (UCE Platform)
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Royal Enfield Electra 350 (Twinspark UCE)











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