Product Description
Ensure perfect combustion and throttle response with the Genuine Royal Enfield VB51 Adaptor Carburettor. This OEM component (Part No: 570886/B) is the official intake manifold designed for Royal Enfield’s 500cc Unit Construction Engines (UCE) using the VB51 carburetor platform.
Constructed from a high-durability, heat-resistant rubber compound, this adaptor provides the critical airtight seal between the carburetor and the cylinder head. Its precise internal geometry is engineered to maintain optimal air-fuel flow velocity, which is essential for the smooth idling and low-end torque characteristics of the 500cc single. Beyond being a standard replacement for factory-carbureted models, the 570886/B is the “gold standard” part used by enthusiasts for EFI-to-Carburetor conversions on Classic 500 and Bullet 500 models, as it allows for a seamless bolt-on fitment of a mechanical carburetor to the UCE head.
Key Features:
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OEM 500cc Spec: The factory-correct intake manifold for the VB51 UCD33 carburetor setup.
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Vibration Isolation: The specialized rubber material dampens engine pulses, preventing fuel foaming in the carburetor bowl.
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Airtight Sealing: Eliminates vacuum leaks that cause “lean runs,” erratic idling, and “popping” on deceleration.
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Conversion Essential: A required component for bypassing EFI systems and installing a carburetor on UCE 500 models.
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Nipple Port: Often includes a vacuum nipple (for specific variants) to connect to the secondary air injection system or fuel tap vacuum lines.
Product Specifications:
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Brand: Royal Enfield Genuine Parts
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Part Number: 570886/B (Replaces 570886)
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Platform: VB51 (UCD33 Carburetor)
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Material: Fuel-Grade Heat-Resistant Rubber
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Compatibility:
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✅ Royal Enfield Bullet 500 UCE (Carbureted & EFI-to-Carb)
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✅ Royal Enfield Classic 500 (EFI-to-Carb conversion)
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✅ Royal Enfield Thunderbird 500 (EFI-to-Carb conversion)
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❌ Note: Not for 350cc UCE models (uses RLT00011/A) or older Cast Iron engines.
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