Product Description
The 574128/E Auto Chain Tensioner Assembly is engineered for the 411cc LS engine platform. It utilizes a spring-loaded ratchet mechanism that automatically extends as the timing chain wears over time. This constant pressure ensures that the cam chain stays perfectly seated against the guides, maintaining accurate valve timing and reducing mechanical “clatter” or “rattling” sounds from the engine head.
Constructed from high-strength alloy and high-grade steel, this tensioner is built to handle the thermal expansion and vibrations of long-distance adventure riding. Unlike manual tensioners, this OEM part requires no periodic adjustment, providing a “set-and-forget” solution for engine reliability. Replacing a failing tensioner with this genuine part is the most effective way to quieten a noisy top-end and ensure smooth power delivery.
Key Features:
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Automatic Adjustment: Self-adjusting ratchet mechanism compensates for chain stretch in real-time.
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Precision Timing: Ensures the camshaft and crankshaft remain perfectly synchronized for optimal combustion.
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Noise Reduction: Eliminates cam chain slap and reduces overall engine vibration and mechanical noise.
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OEM Durability: Manufactured to factory specifications for a perfect fit and long service life.
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Quality Assured: Comes in official Royal Enfield packaging with a holographic security label and QR code for authenticity.
Technical Specifications:
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Part Number: 574128/E
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Compatibility: Royal Enfield Himalayan 411 (BS3, BS4, BS6), Scram 411.
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Component Type: Cam Chain / Timing Chain Tensioner.
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Weight: ~102 grams.
- Country of Origin: India.










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