{"product_id":"royal-enfield-570889-vb51-carburettor-ucd33-bullet-500-bs3-thunderbird-500","title":"Royal Enfield 570889\/B – VB51 Carburettor UCD33 for Bullet 500 BS3 \u0026 Thunderbird 500 – Genuine OEM UCD33 Carburettor","description":"\u003cp data-end=\"661\" data-start=\"239\"\u003eThe \u003cstrong data-end=\"334\" data-start=\"283\"\u003eRoyal Enfield 570889\/B – VB51 Carburettor UCD33\u003c\/strong\u003e is the \u003cstrong data-end=\"369\" data-start=\"342\"\u003egenuine OEM carburettor\u003c\/strong\u003e used on select \u003cstrong data-end=\"417\" data-start=\"385\"\u003ecarburetted 500cc UCE models\u003c\/strong\u003e, primarily the \u003cstrong data-end=\"451\" data-start=\"433\"\u003eBullet 500 BS3\u003c\/strong\u003e and \u003cstrong data-end=\"479\" data-start=\"456\"\u003eThunderbird 500 BS3\u003c\/strong\u003e. Official parts aggregators list 570889\/B as \u003cstrong data-end=\"555\" data-start=\"525\"\u003e“VB51 – CARBURETTOR UCD33”\u003c\/strong\u003e, confirming it as the factory-spec unit supplied on new vehicles. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"1007\" data-start=\"663\"\u003eMultiple trusted Indian and export sellers clearly specify this carburettor as \u003cstrong data-end=\"810\" data-start=\"742\"\u003e“Carburettor UCD33 for Royal Enfield Bullet 500 BS3 (2010–2016)”\u003c\/strong\u003e, while UCAL’s own catalogue identifies \u003cstrong data-end=\"872\" data-start=\"850\"\u003eUCD33-2 (570889\/B)\u003c\/strong\u003e for \u003cstrong data-end=\"905\" data-start=\"877\"\u003eThunderbird 500 CC BSIII\u003c\/strong\u003e, cementing its application on these 500cc UCE BS3 carb bikes. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"1444\" data-start=\"1009\"\u003eBuilt to precise OEM tolerances, the VB51 UCD33 carb ensures the correct \u003cstrong data-end=\"1141\" data-start=\"1082\"\u003eair–fuel mixture, throttle response, and idle stability\u003c\/strong\u003e, especially important on long-distance touring and hot Indian conditions. A worn, clogged or locally rebuilt carburettor often causes poor mileage, missing, hard starting and flat spots. Replacing it with a brand-new \u003cstrong data-end=\"1384\" data-start=\"1359\"\u003e570889\/B genuine unit\u003c\/strong\u003e restores smooth acceleration and predictable performance.\u003c\/p\u003e\n\u003cp data-end=\"1754\" data-start=\"1446\"\u003eThis carburettor is also widely used in \u003cstrong data-end=\"1521\" data-start=\"1486\"\u003eEFI-to-carb conversion projects\u003c\/strong\u003e on 500 UCE engines (especially Classic 500), but those applications should always be treated as \u003cstrong data-end=\"1636\" data-start=\"1618\"\u003econversion use\u003c\/strong\u003e, not factory fitment, and verified with a competent mechanic before purchase. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-end=\"1759\" data-start=\"1756\"\u003e\n\u003cp data-end=\"1781\" data-start=\"1761\"\u003eKey Features \u003c\/p\u003e\n\u003cul data-end=\"2832\" data-start=\"1783\"\u003e\n\u003cli data-end=\"1901\" data-start=\"1783\"\u003e\n\u003cp data-end=\"1901\" data-start=\"1785\"\u003e\u003cstrong data-end=\"1837\" data-start=\"1785\"\u003eGenuine Royal Enfield OEM VB51 Carburettor UCD33\u003c\/strong\u003e – Part No. \u003cstrong data-end=\"1861\" data-start=\"1849\"\u003e570889\/B\u003c\/strong\u003e \u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2046\" data-start=\"1902\"\u003e\n\u003cp data-end=\"2046\" data-start=\"1904\"\u003eConfirmed fitment for \u003cstrong data-end=\"1956\" data-start=\"1926\"\u003eBullet 500 BS3 (2010–2016)\u003c\/strong\u003e and \u003cstrong data-end=\"1984\" data-start=\"1961\"\u003eThunderbird 500 BS3\u003c\/strong\u003e 500cc UCE carb models \u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2177\" data-start=\"2047\"\u003e\n\u003cp data-end=\"2177\" data-start=\"2049\"\u003eConstant-vacuum UCD33 design for \u003cstrong data-end=\"2137\" data-start=\"2082\"\u003esmooth, progressive throttle and consistent fueling\u003c\/strong\u003e \u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2265\" data-start=\"2178\"\u003e\n\u003cp data-end=\"2265\" data-start=\"2180\"\u003eOptimized for 500cc UCE torque delivery, ideal for \u003cstrong data-end=\"2263\" data-start=\"2231\"\u003etouring and highway cruising\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2356\" data-start=\"2266\"\u003e\n\u003cp data-end=\"2356\" data-start=\"2268\"\u003eOEM-calibrated jets and passages for reliable \u003cstrong data-end=\"2354\" data-start=\"2314\"\u003ecold starts, idle and mid-range pull\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2444\" data-start=\"2357\"\u003e\n\u003cp data-end=\"2444\" data-start=\"2359\"\u003eDirect replacement for old, seized, or tampered carbs – \u003cstrong data-end=\"2442\" data-start=\"2415\"\u003eno jugaad, no re-boring\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2542\" data-start=\"2445\"\u003e\n\u003cp data-end=\"2542\" data-start=\"2447\"\u003eHelps reduce \u003cstrong data-end=\"2519\" data-start=\"2460\"\u003emisfiring, hesitation, flat spots and poor fuel economy\u003c\/strong\u003e caused by worn carbs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2716\" data-start=\"2543\"\u003e\n\u003cp data-end=\"2716\" data-start=\"2545\"\u003eCompatible with standard airbox and intake adaptor (e.g., \u003cstrong data-end=\"2643\" data-start=\"2603\"\u003e570886 VB51 adaptor to cylinder head\u003c\/strong\u003e) for a complete, leak-free setup\u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2832\" data-start=\"2717\"\u003e\n\u003cp data-end=\"2832\" data-start=\"2719\"\u003eBacked by Royal Enfield manufacturing quality and UCAL fuel system design \u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"2837\" data-start=\"2834\"\u003e\n\u003cp data-end=\"2875\" data-start=\"2839\"\u003eCompatibility Table \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 height=\"671\" style=\"width: 84.9429%;\" class=\"w-fit min-w-(--thread-content-width)\" data-end=\"3762\" data-start=\"2877\"\u003e\n\u003cthead data-end=\"3008\" data-start=\"2877\"\u003e\n\u003ctr data-end=\"3008\" data-start=\"2877\"\u003e\n\u003cth style=\"width: 11.5422%;\" data-col-size=\"sm\" data-end=\"2899\" data-start=\"2877\"\u003eModel Name\u003c\/th\u003e\n\u003cth style=\"width: 8.14746%;\" data-col-size=\"sm\" data-end=\"2922\" data-start=\"2899\"\u003eEngine Type\u003c\/th\u003e\n\u003cth style=\"width: 7.95347%;\" data-col-size=\"sm\" data-end=\"2933\" data-start=\"2922\"\u003eBS Stage\u003c\/th\u003e\n\u003cth style=\"width: 49.6607%;\" data-col-size=\"sm\" data-end=\"2951\" data-start=\"2933\"\u003eYears (Approx.)\u003c\/th\u003e\n\u003cth style=\"width: 11.6392%;\" data-col-size=\"lg\" data-end=\"2998\" data-start=\"2951\"\u003eNotes \/ Region\u003c\/th\u003e\n\u003cth style=\"width: 10.3783%;\" data-col-size=\"sm\" data-end=\"3008\" data-start=\"2998\"\u003eStatus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-end=\"3762\" data-start=\"3141\"\u003e\n\u003ctr data-end=\"3320\" data-start=\"3141\"\u003e\n\u003ctd style=\"width: 11.5422%;\" data-col-size=\"sm\" data-end=\"3163\" data-start=\"3141\"\u003eBullet 500 UCE\u003c\/td\u003e\n\u003ctd style=\"width: 8.14746%;\" data-end=\"3189\" data-start=\"3163\" data-col-size=\"sm\"\u003e499cc UCE, carb (UCD33)\u003c\/td\u003e\n\u003ctd style=\"width: 7.95347%;\" data-end=\"3197\" data-start=\"3189\" data-col-size=\"sm\"\u003eBS3\u003c\/td\u003e\n\u003ctd style=\"width: 49.6607%;\" data-end=\"3216\" data-start=\"3197\" data-col-size=\"sm\"\u003e2010–2016\u003c\/td\u003e\n\u003ctd style=\"width: 11.6392%;\" data-end=\"3305\" data-start=\"3216\" data-col-size=\"lg\"\u003eListed as “Carburettor UCD33 for Bullet 500 BS3”\u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 10.3783%;\" data-end=\"3320\" data-start=\"3305\" data-col-size=\"sm\"\u003e✔ Confirmed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"3511\" data-start=\"3321\"\u003e\n\u003ctd style=\"width: 11.5422%;\" data-col-size=\"sm\" data-end=\"3343\" data-start=\"3321\"\u003eThunderbird 500\u003c\/td\u003e\n\u003ctd style=\"width: 8.14746%;\" data-end=\"3371\" data-start=\"3343\" data-col-size=\"sm\"\u003e499cc UCE, carb (UCD33-2)\u003c\/td\u003e\n\u003ctd style=\"width: 7.95347%;\" data-end=\"3377\" data-start=\"3371\" data-col-size=\"sm\"\u003eBS3\u003c\/td\u003e\n\u003ctd style=\"width: 49.6607%;\" data-end=\"3396\" data-start=\"3377\" data-col-size=\"sm\"\u003e~2012–2016\u003c\/td\u003e\n\u003ctd style=\"width: 11.6392%;\" data-end=\"3496\" data-start=\"3396\" data-col-size=\"lg\"\u003eUCAL catalogue: UCD33-2 570889\/B – Thunderbird 500 CC BSIII \u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 10.3783%;\" data-end=\"3511\" data-start=\"3496\" data-col-size=\"sm\"\u003e✔ Confirmed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-end=\"3762\" data-start=\"3512\"\u003e\n\u003ctd style=\"width: 11.5422%;\" data-col-size=\"sm\" data-end=\"3551\" data-start=\"3512\"\u003eClassic 500 UCE EFI (conversion use)\u003c\/td\u003e\n\u003ctd style=\"width: 8.14746%;\" data-end=\"3581\" data-start=\"3551\" data-col-size=\"sm\"\u003e499cc UCE, EFI from factory\u003c\/td\u003e\n\u003ctd style=\"width: 7.95347%;\" data-end=\"3591\" data-start=\"3581\" data-col-size=\"sm\"\u003eBS3\/BS4\u003c\/td\u003e\n\u003ctd style=\"width: 49.6607%;\" data-end=\"3604\" data-start=\"3591\" data-col-size=\"sm\"\u003e~2009–2020\u003c\/td\u003e\n\u003ctd style=\"width: 11.6392%;\" data-end=\"3737\" data-start=\"3604\" data-col-size=\"lg\"\u003eWidely used in EFI-to-carb conversions; not factory-supplied carb – verify before purchase \u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 10.3783%;\" data-end=\"3762\" data-start=\"3737\" 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-end=\"3814\" data-start=\"3764\"\u003eCHECK PART NUMBER BEFORE PURCHASE\u003c\/p\u003e\n\u003chr data-end=\"4051\" data-start=\"4048\"\u003e\n\u003cp data-end=\"4064\" data-start=\"4053\"\u003eVariants:\u003c\/p\u003e\n\u003cul data-end=\"4201\" data-start=\"4066\"\u003e\n\u003cli data-end=\"4201\" data-start=\"4066\"\u003e\n\u003cp data-end=\"4089\" data-start=\"4068\"\u003e\u003cstrong data-end=\"4087\" data-start=\"4068\"\u003eSingle Variant:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"4201\" data-start=\"4092\"\u003e\n\u003cli data-end=\"4201\" data-start=\"4092\"\u003e\n\u003cp data-end=\"4201\" data-start=\"4094\"\u003e\u003cstrong data-end=\"4140\" data-start=\"4094\"\u003eVB51 Carburettor UCD33 – Part No. 570889\/B\u003c\/strong\u003e (standard UCD33 spec for Bullet 500 \/ Thunderbird 500 BS3)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"4239\" data-start=\"4203\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003chr data-end=\"4244\" data-start=\"4241\"\u003e\n\u003cp data-end=\"4257\" data-start=\"4246\"\u003eFAQs\u003c\/p\u003e\n\u003cp data-end=\"4480\" data-start=\"4259\"\u003e\u003cstrong data-end=\"4311\" data-start=\"4259\"\u003eQ1. Will this carburettor fit my Bullet 500 BS3?\u003c\/strong\u003e\u003cbr data-end=\"4314\" data-start=\"4311\"\u003eYes. Multiple trusted Indian sellers and catalogues list \u003cstrong data-end=\"4389\" data-start=\"4371\"\u003e570889\/B UCD33\u003c\/strong\u003e specifically for \u003cstrong data-end=\"4437\" data-start=\"4407\"\u003eBullet 500 BS3 (2010–2016)\u003c\/strong\u003e. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"4719\" data-start=\"4482\"\u003e\u003cstrong data-end=\"4530\" data-start=\"4482\"\u003eQ2. Is it also suitable for Thunderbird 500?\u003c\/strong\u003e\u003cbr data-end=\"4533\" data-start=\"4530\"\u003eYes. UCAL’s official carburettor range shows \u003cstrong data-end=\"4600\" data-start=\"4578\"\u003eUCD33-2 (570889\/B)\u003c\/strong\u003e as the carburettor for \u003cstrong data-end=\"4652\" data-start=\"4624\"\u003eThunderbird 500 CC BSIII\u003c\/strong\u003e, confirming factory use. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"5112\" data-start=\"4721\"\u003e\u003cstrong data-end=\"4785\" data-start=\"4721\"\u003eQ3. Can I use this for a Classic 500 EFI-to-carb conversion?\u003c\/strong\u003e\u003cbr data-end=\"4788\" data-start=\"4785\"\u003eThis carb is widely used in \u003cstrong data-end=\"4855\" data-start=\"4816\"\u003eClassic 500 EFI-to-carb conversions\u003c\/strong\u003e and appears in conversion parts lists, but this is a \u003cstrong data-end=\"4935\" data-start=\"4909\"\u003econversion application\u003c\/strong\u003e, not the original factory setup. Always consult a skilled mechanic and verify jetting, manifold and TCI compatibility before ordering.\u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"5396\" data-start=\"5114\"\u003e\u003cstrong data-end=\"5163\" data-start=\"5114\"\u003eQ4. Does it come pre-jetted from the factory?\u003c\/strong\u003e\u003cbr data-end=\"5166\" data-start=\"5163\"\u003eYes, the carburettor comes with \u003cstrong data-end=\"5219\" data-start=\"5198\"\u003eOEM UCD33 jetting\u003c\/strong\u003e as supplied by Royal Enfield\/UCAL for 500cc UCE BS3 models. Fine tuning may still be needed based on altitude, exhaust and air filter. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003cspan data-testid=\"webpage-citation-pill\" class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"5675\" data-start=\"5398\"\u003e\u003cstrong data-end=\"5462\" data-start=\"5398\"\u003eQ5. What other parts should I check when replacing the carb?\u003c\/strong\u003e\u003cbr data-end=\"5465\" data-start=\"5462\"\u003eInspect the \u003cstrong data-end=\"5510\" data-start=\"5477\"\u003ecarb-to-head adaptor (570886)\u003c\/strong\u003e, air filter, throttle cable and fuel lines. Cracked intake rubbers or clogged filters can limit the benefit of a new carb.\u003c\/p\u003e","brand":"UNDER THE HOOD","offers":[{"title":"Default Title","offer_id":50681181700391,"sku":null,"price":5160.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/58F6EBC6-5A0E-4EFA-910A-D0DBE251421A.jpg?v=1763268763","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-570889-vb51-carburettor-ucd33-bullet-500-bs3-thunderbird-500","provider":"UNDER THE HOOD","version":"1.0","type":"link"}