{"product_id":"royal-enfield-570886-b-vb51-carburettor-adaptor-cylinder-head-bullet-classic-thunderbird-500","title":"Royal Enfield 570886\/B – VB51 Carburettor Adaptor to Cylinder Head for Bullet 500, Classic 500 \u0026 Thunderbird 500 (UCE 500cc, EFI-to-Carb Manifold)","description":"\u003cp data-start=\"295\" data-end=\"741\"\u003eThe \u003cstrong data-start=\"343\" data-end=\"413\"\u003eRoyal Enfield 570886\/B – VB51 Adaptor Carburettor to Cylinder Head\u003c\/strong\u003e is the \u003cstrong data-start=\"421\" data-end=\"467\"\u003egenuine OEM intake manifold \/ carb adaptor\u003c\/strong\u003e used on Royal Enfield 500cc UCE engines. Official parts lists describe this part as \u003cstrong data-start=\"552\" data-end=\"596\"\u003e“VB51 – ADAPTOR CARBURETTOR TO CYL HEAD”\u003c\/strong\u003e, confirming it as the factory-spec connector between carburettor and cylinder head on the VB51 platform. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"743\" data-end=\"1050\"\u003eMultiple trusted sellers list \u003cstrong data-start=\"773\" data-end=\"785\"\u003e570886\/B\u003c\/strong\u003e specifically for \u003cstrong data-start=\"803\" data-end=\"876\"\u003eStandard\/Bullet 500, Classic 500 and Thunderbird 500 500cc UCE models\u003c\/strong\u003e, making it the correct choice for both \u003cstrong data-start=\"916\" data-end=\"942\"\u003estock VB51 carb setups\u003c\/strong\u003e and popular \u003cstrong data-start=\"955\" data-end=\"988\"\u003eEFI-to-carb conversion builds\u003c\/strong\u003e on these motorcycles. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1052\" data-end=\"1656\"\u003eManufactured from durable, heat-resistant rubber\/compound, this adaptor maintains proper \u003cstrong data-start=\"1141\" data-end=\"1177\"\u003eair–fuel flow, angle and sealing\u003c\/strong\u003e between carb and head, preventing \u003cstrong data-start=\"1212\" data-end=\"1270\"\u003eair leaks, erratic idling, flat spots and lean running\u003c\/strong\u003e. Upgrading a worn, cracked or hardened manifold with this genuine part restores throttle response and reliability, especially on tuned or long-distance bikes. Technical discussions and conversion guides for Classic 500 and other 500 UCE models also reference \u003cstrong data-start=\"1530\" data-end=\"1573\"\u003e570886\/B as the correct intake manifold\u003c\/strong\u003e when converting EFI models to carburettor.\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1658\" data-end=\"1927\"\u003eIf you are rebuilding a 500 UCE engine, fixing intake leaks or performing an \u003cstrong data-start=\"1735\" data-end=\"1761\"\u003eEFI-to-carb conversion\u003c\/strong\u003e on Bullet 500 \/ Classic 500 \/ Thunderbird 500, this \u003cstrong data-start=\"1814\" data-end=\"1834\"\u003eOEM VB51 adaptor\u003c\/strong\u003e is the right and safest part to use—no jugaad, no guesswork, just factory-correct fitment.\u003c\/p\u003e\n\u003chr data-start=\"1929\" data-end=\"1932\"\u003e\n\u003ch3 data-start=\"1934\" data-end=\"1957\"\u003eKey Features \u003c\/h3\u003e\n\u003cul data-start=\"1959\" data-end=\"3043\"\u003e\n\u003cli data-start=\"1959\" data-end=\"2104\"\u003e\n\u003cp data-start=\"1961\" data-end=\"2104\"\u003e\u003cstrong data-start=\"1961\" data-end=\"1990\"\u003eGenuine Royal Enfield OEM\u003c\/strong\u003e part – \u003cstrong data-start=\"1998\" data-end=\"2043\"\u003eVB51 Adaptor Carburettor to Cylinder Head\u003c\/strong\u003e (Part No. 570886\/B). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2105\" data-end=\"2234\"\u003e\n\u003cp data-start=\"2107\" data-end=\"2234\"\u003eDesigned for \u003cstrong data-start=\"2120\" data-end=\"2141\"\u003e500cc UCE engines\u003c\/strong\u003e used on Bullet 500, Classic 500 and Thunderbird 500. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2235\" data-end=\"2380\"\u003e\n\u003cp data-start=\"2237\" data-end=\"2380\"\u003eProvides correct \u003cstrong data-start=\"2254\" data-end=\"2292\"\u003ecarb-to-head alignment and sealing\u003c\/strong\u003e, reducing intake air leaks and unstable idling. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2381\" data-end=\"2515\"\u003e\n\u003cp data-start=\"2383\" data-end=\"2515\"\u003eIdeal for \u003cstrong data-start=\"2393\" data-end=\"2428\"\u003eEFI-to-carb conversion projects\u003c\/strong\u003e on 500 UCE models using VB51 carburettor kits. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2516\" data-end=\"2649\"\u003e\n\u003cp data-start=\"2518\" data-end=\"2649\"\u003eHeat- and fuel-resistant construction for \u003cstrong data-start=\"2560\" data-end=\"2581\"\u003elong service life\u003c\/strong\u003e and consistent performance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2650\" data-end=\"2789\"\u003e\n\u003cp data-start=\"2652\" data-end=\"2789\"\u003eDirect replacement part – no modification required when used with compatible heads and VB51 carb. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2790\" data-end=\"2925\"\u003e\n\u003cp data-start=\"2792\" data-end=\"2925\"\u003eHelps restore \u003cstrong data-start=\"2806\" data-end=\"2853\"\u003esmooth throttle response and low-end torque\u003c\/strong\u003e on ageing or leaking manifolds.\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2926\" data-end=\"3043\"\u003e\n\u003cp data-start=\"2928\" data-end=\"3043\"\u003eBacked by Royal Enfield OEM quality – same spec as supplied from factory.\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3045\" data-end=\"3048\"\u003e\n\u003ch3 data-start=\"3050\" data-end=\"3089\"\u003eCompatibility Table \u003c\/h3\u003e\n\u003cp data-start=\"3091\" data-end=\"3178\"\u003e\u003cstrong data-start=\"3091\" data-end=\"3116\"\u003eCore engine platform:\u003c\/strong\u003e 499cc single-cylinder \u003cstrong data-start=\"3139\" data-end=\"3150\"\u003eUCE 500\u003c\/strong\u003e (India \u0026amp; export markets).\u003c\/p\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"3180\" data-end=\"4198\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"3180\" data-end=\"3328\"\u003e\n\u003ctr data-start=\"3180\" data-end=\"3328\"\u003e\n\u003cth data-start=\"3180\" data-end=\"3209\" data-col-size=\"sm\"\u003eModel Name\u003c\/th\u003e\n\u003cth data-start=\"3209\" data-end=\"3230\" data-col-size=\"sm\"\u003eEngine Type\u003c\/th\u003e\n\u003cth data-start=\"3230\" data-end=\"3253\" data-col-size=\"sm\"\u003eBS Stage*\u003c\/th\u003e\n\u003cth data-start=\"3253\" data-end=\"3278\" data-col-size=\"sm\"\u003eApprox. Years in India\u003c\/th\u003e\n\u003cth data-start=\"3278\" data-end=\"3318\" data-col-size=\"md\"\u003eNotes \/ Region\u003c\/th\u003e\n\u003cth data-start=\"3318\" data-end=\"3328\" data-col-size=\"sm\"\u003eStatus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"3478\" data-end=\"4198\"\u003e\n\u003ctr data-start=\"3478\" data-end=\"3721\"\u003e\n\u003ctd data-start=\"3478\" data-end=\"3506\" data-col-size=\"sm\"\u003eBullet \/ Standard 500 UCE\u003c\/td\u003e\n\u003ctd data-start=\"3506\" data-end=\"3527\" data-col-size=\"sm\"\u003e499cc UCE, EFI\u003c\/td\u003e\n\u003ctd data-start=\"3527\" data-end=\"3550\" data-col-size=\"sm\"\u003eBS3, BS4\u003c\/td\u003e\n\u003ctd data-start=\"3550\" data-end=\"3603\" data-col-size=\"sm\"\u003e~2009–2020 \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd data-start=\"3603\" data-end=\"3706\" data-col-size=\"md\"\u003eListed for Bullet 500 UCE \/ Standard 500 by multiple sellers \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd data-start=\"3706\" data-end=\"3721\" data-col-size=\"sm\"\u003e✔ Confirmed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3722\" data-end=\"3957\"\u003e\n\u003ctd data-start=\"3722\" data-end=\"3750\" data-col-size=\"sm\"\u003eClassic 500 (UCE EFI)\u003c\/td\u003e\n\u003ctd data-start=\"3750\" data-end=\"3771\" data-col-size=\"sm\"\u003e499cc UCE, EFI\u003c\/td\u003e\n\u003ctd data-start=\"3771\" data-end=\"3794\" data-col-size=\"sm\"\u003eBS3, BS4\u003c\/td\u003e\n\u003ctd data-start=\"3794\" data-end=\"3846\" data-col-size=\"sm\"\u003e\u003c\/td\u003e\n\u003ctd data-start=\"3846\" data-end=\"3942\" data-col-size=\"md\"\u003e\u003c\/td\u003e\n\u003ctd data-start=\"3942\" data-end=\"3957\" data-col-size=\"sm\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3958\" data-end=\"4198\"\u003e\n\u003ctd data-start=\"3958\" data-end=\"3990\" data-col-size=\"sm\"\u003eThunderbird 500 \/ Rumbler 500\u003c\/td\u003e\n\u003ctd data-start=\"3990\" data-end=\"4007\" data-col-size=\"sm\"\u003e499cc UCE, EFI\u003c\/td\u003e\n\u003ctd data-start=\"4007\" data-end=\"4030\" data-col-size=\"sm\"\u003eBS3, BS4\u003c\/td\u003e\n\u003ctd data-start=\"4030\" data-end=\"4083\" data-col-size=\"sm\"\u003e~2013–2020 \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd data-start=\"4083\" data-end=\"4183\" data-col-size=\"md\"\u003e\n\u003cbr\u003e\u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd data-start=\"4183\" data-end=\"4198\" data-col-size=\"sm\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp data-start=\"4200\" data-end=\"4390\"\u003e\u003cbr\u003e\u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"4392\" data-end=\"4442\"\u003eCHECK PART NUMBER BEFORE PURCHASE\u003c\/p\u003e\n\u003chr data-start=\"4696\" data-end=\"4699\"\u003e\n\u003ch3 data-start=\"4701\" data-end=\"4715\"\u003eVariants\u003c\/h3\u003e\n\u003cul data-start=\"4717\" data-end=\"4848\"\u003e\n\u003cli data-start=\"4717\" data-end=\"4848\"\u003e\n\u003cp data-start=\"4719\" data-end=\"4740\"\u003e\u003cstrong data-start=\"4719\" data-end=\"4738\"\u003eSingle Variant:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"4743\" data-end=\"4848\"\u003e\n\u003cli data-start=\"4743\" data-end=\"4848\"\u003e\n\u003cp data-start=\"4745\" data-end=\"4848\"\u003eRoyal Enfield \u003cstrong data-start=\"4759\" data-end=\"4815\"\u003e570886\/B – VB51 Adaptor Carburettor to Cylinder Head\u003c\/strong\u003e (standard black\/rubber finish)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4850\" data-end=\"4887\"\u003e(No LH\/RH, color or size variants.)\u003c\/p\u003e\n\u003chr data-start=\"4889\" data-end=\"4892\"\u003e\n\u003ch3 data-start=\"4894\" data-end=\"4908\"\u003eFAQs\u003c\/h3\u003e\n\u003cp data-start=\"4910\" data-end=\"5228\"\u003e\u003cstrong data-start=\"4910\" data-end=\"4968\"\u003eQ1. Will this fit my Classic 500 EFI from the factory?\u003c\/strong\u003e\u003cbr data-start=\"4968\" data-end=\"4971\"\u003eONLY CARBURETOR MODEL\u003c\/p\u003e\n\u003cp data-start=\"5230\" data-end=\"5465\"\u003e\u003cstrong data-start=\"5230\" data-end=\"5285\"\u003eQ2. Does it work for Thunderbird 500 \/ Rumbler 500?\u003c\/strong\u003e\u003cbr data-start=\"5285\" data-end=\"5288\"\u003eYes BUT CARBURETOR 500 CC MODEL \u003c\/p\u003e\n\u003cp data-start=\"5467\" data-end=\"5779\"\u003e\u003cstrong data-start=\"5467\" data-end=\"5538\"\u003eQ3. Is this suitable for EFI-to-carb conversion on 500 UCE engines?\u003c\/strong\u003e\u003cbr data-start=\"5538\" data-end=\"5541\"\u003eYes. Classic 500 \/ Bullet 500 conversion builds frequently list \u003cstrong data-start=\"5605\" data-end=\"5643\"\u003e570886\/B VB51 carburettor manifold\u003c\/strong\u003e as the specific part that connects the new carburettor to the original 500 UCE cylinder head.\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"5781\" data-end=\"6033\"\u003e\u003cstrong data-start=\"5781\" data-end=\"5825\"\u003eQ4. Will this fit a 350cc UCE or GT 535?\u003c\/strong\u003e\u003cbr data-start=\"5825\" data-end=\"5828\"\u003eNO THEY HAVE DIFFERENT PART NUMBERS \u003c\/p\u003e\n\u003cp data-start=\"6035\" data-end=\"6329\"\u003e\u003cstrong data-start=\"6035\" data-end=\"6095\"\u003eQ5. How do I confirm this is the right part for my bike?\u003c\/strong\u003e\u003cbr data-start=\"6095\" data-end=\"6098\"\u003eMatch the part number on your existing manifold or cross-check \u003cstrong data-start=\"6161\" data-end=\"6212\"\u003e570886\/B – VB51 Adaptor Carburettor to Cyl Head\u003c\/strong\u003e in the official Royal Enfield parts catalog for your exact model and year.\u003c\/p\u003e","brand":"UNDER THE HOOD","offers":[{"title":"Default Title","offer_id":50681193759015,"sku":null,"price":335.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/OEM_VB51_intake_manifold_570886_B_for_Classic_500_and_Thunderbird_500_UCE.png?v=1763032574","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-570886-b-vb51-carburettor-adaptor-cylinder-head-bullet-classic-thunderbird-500","provider":"UNDER THE HOOD","version":"1.0","type":"link"}