The Royal Enfield Genuine Stem Seal (Part No. 146680/A) is a vital engine component designed specifically for the “Old Model” Cast-Iron (CI) Bullet series. These valve stem seals sit atop the valve guides within the cylinder head, acting as a precision barrier to prevent engine oil from leaking down the valve stems and into the combustion chamber.
Manufactured from high-grade, heat-resistant Viton or specialized fluoroelastomer rubber these seals are engineered to maintain their flexibility and sealing integrity despite the extreme temperatures of the cylinder head. Using the genuine 146680/A seal is essential for vintage engines to prevent “blue smoke” on startup and to keep the intake and exhaust valves free from excessive carbon buildup.
Key Features:
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100% Genuine Part: Authentic Royal Enfield replacement component as verified by the official factory packaging .
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High-Temperature Resistance: Formulated to withstand constant exposure to hot engine oil and combustion heat without hardening.
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Precision Friction Control: Designed to provide a perfect seal while allowing just enough lubrication for the valve stem to move smoothly within the guide.
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Vintage Spec Accuracy: Tailored to the exact dimensions of the 350cc and 500cc Cast-Iron engine valve guides.
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Prevents Oil Consumption: Eliminates oil leakage into the cylinder, protecting your spark plugs from fouling and maintaining emissions.
Technical Specifications:
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Brand: Royal Enfield Genuine
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Part Number: 146680/A
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Component: Valve Stem Seal
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Material: Heat-Resistant Fluoroelastomer
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Country of Origin: India
Motorcycle Compatibility
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Royal Enfield Bullet 350 (Standard / Cast-Iron Engine)
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Royal Enfield Bullet 500 (Old Model / Cast-Iron)
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Royal Enfield Machismo (CI 350 Models)
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Royal Enfield Electra (Early Cast-Iron Variants)










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