The Royal Enfield Genuine Spark Plug (Part No. 141148) is a specialized, vintage-specification ignition component designed for the classic “Old Model” Cast-Iron (CI) Bullet engines. Unlike modern multi-plug systems, this classic engine setup relies completely on a single, high-durability plug to ensure uniform fuel-air mixture combustion inside the heavy-duty cast-iron cylinder head.
this spark plug features a robust M14 thread profile combined with a resilient electrode core built to handle the unique thermal dynamics of vintage long-stroke engines. Using the genuine 141148 plug guarantees steady engine thumping (idling), cleaner combustion, and reduces the risk of cold-starting kickbacks common with incorrect heat-range alternatives.
Key Features:
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100% Genuine Vintage Component: Authentic Royal Enfield replacement hardware as verified by the official vintage packaging label .
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Vintage Engine Optimized: Formulated with the precise historical heat rating and thread reach meant specifically for 350cc/500cc cast-iron blocks.
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Heavy-Duty Copper-Alloy Core: Provides efficient thermal conductivity, avoiding localized hot spots and reducing carbon fouling.
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Rugged Ceramic Insulator: Built to withstand high-voltage surges from traditional point-ignition or early CDI systems without grounding out.
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Corrosion-Resistant Shell: High-grade metal finish protects against moisture, rust, and thread-seizing inside the cylinder head.
Technical Specifications:
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Brand: Royal Enfield Genuine
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Part Number: 141148
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Component: Spark Plug (Primary Ignition)
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Thread Diameter: M14
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Material: Ceramic Insulator with Copper-Alloy Core
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Country of Origin: India
Motorcycle Compatibility
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Royal Enfield Bullet 350 (Standard / Cast-Iron Engine / Heavy Flywheel Models)
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Royal Enfield Bullet 500 (Old Model / Vintage Cast-Iron)
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Royal Enfield Machismo 350 (Early Cast-Iron Variants)
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Royal Enfield Electra 350 (Early Carburetor/Cast-Iron Models)











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