The Royal Enfield Genuine Stem Cap (Part No. 140006/B) is a specialized internal engine component designed for the “Old Model” Cast-Iron (CI) Bullet series. These caps sit atop the valve stems within the cylinder head assembly, acting as the primary contact point between the rocker arms and the valves.
these caps are precision-machined from hardened steel to withstand constant mechanical pounding and high-frequency friction. Using the genuine 140006/B stem cap is vital for vintage engines to ensure correct valve clearance (tappet setting) and to prevent the rocker arms from causing direct wear or “mushrooming” on the valve stems.
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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Hardened Steel Construction: Specifically heat-treated to resist surface indentation and wear from rocker arm impact.
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Precision Fit: Machined to exact factory tolerances to ensure a snug fit on the valve stem, maintaining consistent valve timing.
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Vintage Spec Accuracy: Tailored specifically for the 350cc and 500cc Cast-Iron engine architecture.
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Engine Protection: Distributes the force of the rocker arm evenly, extending the life of your intake and exhaust valves.
Technical Specifications:
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Brand: Royal Enfield Genuine
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Part Number: 140006/B
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Component: Valve Stem Cap (Tappet Cap)
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Material: Hardened Alloy Steel
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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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