{"product_id":"royal-enfield-500843-float-assembly-cv-carb-classic-bullet-350-uce","title":"Royal Enfield 500843 – Float Assembly \/ CV Carb Float with Needle Valve for Classic 350 UCE, Bullet 350 UCE, Electra 350 \u0026 Thunderbird 350 (TBTS\/NTB)","description":"\u003cp data-start=\"311\" data-end=\"694\"\u003eThe \u003cstrong data-start=\"315\" data-end=\"371\"\u003eRoyal Enfield 500843 Float Assembly (CV Carburettor)\u003c\/strong\u003e is the genuine OEM \u003cstrong data-start=\"391\" data-end=\"436\"\u003ecarburettor float + needle valve assembly\u003c\/strong\u003e used in the BS29 CV carb on multiple \u003cstrong data-start=\"474\" data-end=\"485\"\u003e350 UCE\u003c\/strong\u003e models. In official Royal Enfield parts lists it is described as \u003cstrong data-start=\"551\" data-end=\"617\"\u003e“FLOAT ASSLY. T1 \/ Float Assembly with Needle Valve – CV Carb”\u003c\/strong\u003e, confirming that this is the complete float unit, not a local substitute.\u003c\/p\u003e\n\u003cp data-start=\"696\" data-end=\"1018\"\u003eTrusted spares catalogues and dealers list 500843 for \u003cstrong data-start=\"750\" data-end=\"855\"\u003eClassic 350 UCE, Bullet 350 UCE (KS \u0026amp; ES), Electra 350 UCE (ES), and Thunderbird 350 (TBTS \/ NTB 350)\u003c\/strong\u003e. UK\/overseas sellers also tag it specifically as \u003cstrong data-start=\"907\" data-end=\"969\"\u003eClassic 350 BSIII \/ BSIV \/ ABS BSIV float body-carburettor\u003c\/strong\u003e, reinforcing its role on carbureted UCE 350s.\u003c\/p\u003e\n\u003cp data-start=\"1020\" data-end=\"1394\"\u003eInside your carburettor, the float assembly controls \u003cstrong data-start=\"1073\" data-end=\"1105\"\u003efuel level in the float bowl\u003c\/strong\u003e. A worn or leaking float or needle can cause \u003cstrong data-start=\"1151\" data-end=\"1249\"\u003ehard starting, flooding, petrol overflow from the drain, poor mileage or hesitation under load\u003c\/strong\u003e. Replacing with a genuine 500843 restores the correct fuel height so your UCE 350 runs clean, idles steadily and responds crisply to throttle.\u003c\/p\u003e\n\u003cp data-start=\"1396\" data-end=\"1719\"\u003eThis part is ideal if you’re overhauling the carburettor, sorting long-pending starting issues, or restoring a Classic \/ Bullet \/ Electra \/ Thunderbird to factory spec. Being OEM, it matches the original Keihin CV carb dimensions and works with the stock jets and bowl, avoiding tuning headaches common with generic floats.\u003c\/p\u003e\n\u003chr data-start=\"1721\" data-end=\"1724\"\u003e\n\u003ch3 data-start=\"1726\" data-end=\"1749\"\u003eKey Features \u003c\/h3\u003e\n\u003cul data-start=\"1751\" data-end=\"2870\"\u003e\n\u003cli data-start=\"1751\" data-end=\"1889\"\u003e\n\u003cp data-start=\"1753\" data-end=\"1889\"\u003e\u003cstrong data-start=\"1753\" data-end=\"1783\"\u003eGenuine Royal Enfield part\u003c\/strong\u003e – OEM \u003cstrong data-start=\"1790\" data-end=\"1818\"\u003eFloat Assembly (CV Carb)\u003c\/strong\u003e, part no. \u003cstrong data-start=\"1829\" data-end=\"1839\"\u003e500843\u003c\/strong\u003e, listed in official RE part number catalogues.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1890\" data-end=\"2034\"\u003e\n\u003cp data-start=\"1892\" data-end=\"2034\"\u003e\u003cstrong data-start=\"1892\" data-end=\"1930\"\u003eComplete float + needle valve unit\u003c\/strong\u003e – Officially described as \u003cstrong data-start=\"1957\" data-end=\"2005\"\u003e“Float Assembly with Needle Valve – CV Carb”\u003c\/strong\u003e, not just a plastic body.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2035\" data-end=\"2178\"\u003e\n\u003cp data-start=\"2037\" data-end=\"2178\"\u003e\u003cstrong data-start=\"2037\" data-end=\"2073\"\u003eDesigned for BS29 CV carburettor\u003c\/strong\u003e used on \u003cstrong data-start=\"2082\" data-end=\"2105\"\u003e350 UCE carb models\u003c\/strong\u003e (Classic 350, Bullet 350 UCE, Electra 350, Thunderbird 350 TBTS\/NTB).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2179\" data-end=\"2314\"\u003e\n\u003cp data-start=\"2181\" data-end=\"2314\"\u003e\u003cstrong data-start=\"2181\" data-end=\"2212\"\u003eRestores correct fuel level\u003c\/strong\u003e – Helps cure petrol overflow, flooding, bogging, and inconsistent idle due to worn float or needle.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2315\" data-end=\"2433\"\u003e\n\u003cp data-start=\"2317\" data-end=\"2433\"\u003e\u003cstrong data-start=\"2317\" data-end=\"2339\"\u003eDirect replacement\u003c\/strong\u003e – Drop-in fit into the original CV carb float bowl; no machining or modification required.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2434\" data-end=\"2554\"\u003e\n\u003cp data-start=\"2436\" data-end=\"2554\"\u003e\u003cstrong data-start=\"2436\" data-end=\"2457\"\u003eOEM build quality\u003c\/strong\u003e – Correct buoyancy, hinge geometry and needle seating for reliable sealing over long-term use.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2555\" data-end=\"2730\"\u003e\n\u003cp data-start=\"2557\" data-end=\"2730\"\u003e\u003cstrong data-start=\"2557\" data-end=\"2608\"\u003eMulti-model compatibility within UCE 350 family\u003c\/strong\u003e – Confirmed for Classic 350 UCE BSIII\/BSIV, Bullet 350 UCE KS\/ES, Electra 350 ES UCE, Thunderbird 350 (Twinspark\/NTB).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2731\" data-end=\"2870\"\u003e\n\u003cp data-start=\"2733\" data-end=\"2870\"\u003e\u003cstrong data-start=\"2733\" data-end=\"2761\"\u003eBetter than local floats\u003c\/strong\u003e – Avoids common cheap-float issues like swelling, warping, incorrect fuel height and early needle leakage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2872\" data-end=\"2875\"\u003e\n\u003ch3 data-start=\"2877\" data-end=\"2927\"\u003eCompatibility Table\u003c\/h3\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=\"2929\" data-end=\"3793\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"2929\" data-end=\"3072\"\u003e\n\u003ctr data-start=\"2929\" data-end=\"3072\"\u003e\n\u003cth data-start=\"2929\" data-end=\"2963\" data-col-size=\"sm\"\u003eModel\u003c\/th\u003e\n\u003cth data-start=\"2963\" data-end=\"2991\" data-col-size=\"sm\"\u003eEngine \/ Platform\u003c\/th\u003e\n\u003cth data-start=\"2991\" data-end=\"3018\" data-col-size=\"sm\"\u003eFuel System \/ Spec\u003c\/th\u003e\n\u003cth data-start=\"3018\" data-end=\"3043\" data-col-size=\"sm\"\u003eEmission Stage\u003c\/th\u003e\n\u003cth data-start=\"3043\" data-end=\"3062\" data-col-size=\"sm\"\u003eYears* (approx.)\u003c\/th\u003e\n\u003cth data-start=\"3062\" data-end=\"3072\" data-col-size=\"sm\"\u003eStatus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"3217\" data-end=\"3793\"\u003e\n\u003ctr data-start=\"3217\" data-end=\"3361\"\u003e\n\u003ctd data-start=\"3217\" data-end=\"3251\" data-col-size=\"sm\"\u003eClassic 350 UCE (pre-J series)\u003c\/td\u003e\n\u003ctd data-start=\"3251\" data-end=\"3279\" data-col-size=\"sm\"\u003e346 cc UCE single\u003c\/td\u003e\n\u003ctd data-start=\"3279\" data-end=\"3306\" data-col-size=\"sm\"\u003eBS29 CV carburettor\u003c\/td\u003e\n\u003ctd data-start=\"3306\" data-end=\"3332\" data-col-size=\"sm\"\u003eBSIII, BSIV (incl. ABS)\u003c\/td\u003e\n\u003ctd data-start=\"3332\" data-end=\"3346\" data-col-size=\"sm\"\u003e~2009–2020\u003c\/td\u003e\n\u003ctd data-start=\"3346\" data-end=\"3361\" data-col-size=\"sm\"\u003e✅ Confirmed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3362\" data-end=\"3505\"\u003e\n\u003ctd data-start=\"3362\" data-end=\"3396\" data-col-size=\"sm\"\u003eBullet 350 UCE KS \/ ES\u003c\/td\u003e\n\u003ctd data-start=\"3396\" data-end=\"3424\" data-col-size=\"sm\"\u003e346 cc UCE single\u003c\/td\u003e\n\u003ctd data-start=\"3424\" data-end=\"3451\" data-col-size=\"sm\"\u003eCV carb (carb UCE)\u003c\/td\u003e\n\u003ctd data-start=\"3451\" data-end=\"3476\" data-col-size=\"sm\"\u003eBSIII, BSIV\u003c\/td\u003e\n\u003ctd data-start=\"3476\" data-end=\"3490\" data-col-size=\"sm\"\u003e~2009–2019\u003c\/td\u003e\n\u003ctd data-start=\"3490\" data-end=\"3505\" data-col-size=\"sm\"\u003e✅ Confirmed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3506\" data-end=\"3649\"\u003e\n\u003ctd data-start=\"3506\" data-end=\"3540\" data-col-size=\"sm\"\u003eElectra 350 UCE (ES)\u003c\/td\u003e\n\u003ctd data-start=\"3540\" data-end=\"3568\" data-col-size=\"sm\"\u003e346 cc UCE single\u003c\/td\u003e\n\u003ctd data-start=\"3568\" data-end=\"3595\" data-col-size=\"sm\"\u003eCV carb\u003c\/td\u003e\n\u003ctd data-start=\"3595\" data-end=\"3620\" data-col-size=\"sm\"\u003eBSIII \/ early BSIV\u003c\/td\u003e\n\u003ctd data-start=\"3620\" data-end=\"3634\" data-col-size=\"sm\"\u003e~2009–2016\u003c\/td\u003e\n\u003ctd data-start=\"3634\" data-end=\"3649\" data-col-size=\"sm\"\u003e✅ Confirmed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3650\" data-end=\"3793\"\u003e\n\u003ctd data-start=\"3650\" data-end=\"3684\" data-col-size=\"sm\"\u003eThunderbird 350 (TBTS \/ NTB 350)\u003c\/td\u003e\n\u003ctd data-start=\"3684\" data-end=\"3712\" data-col-size=\"sm\"\u003e346 cc UCE \/ Twinspark\u003c\/td\u003e\n\u003ctd data-start=\"3712\" data-end=\"3739\" data-col-size=\"sm\"\u003eCV carb (Thunderbird 350)\u003c\/td\u003e\n\u003ctd data-start=\"3739\" data-end=\"3764\" data-col-size=\"sm\"\u003eBSIII \/ BSIV\u003c\/td\u003e\n\u003ctd data-start=\"3764\" data-end=\"3778\" data-col-size=\"sm\"\u003e~2009–2019\u003c\/td\u003e\n\u003ctd data-start=\"3778\" data-end=\"3793\" data-col-size=\"sm\"\u003e✅ Confirmed\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=\"3795\" data-end=\"3971\"\u003e*Years are indicative based on known production of UCE carb 350 models; part catalogues and dealer listings tie 500843 to these platforms, not to BS6 J-series or EFI bikes.\u003c\/p\u003e\n\u003cp data-start=\"3973\" data-end=\"4012\"\u003e\u003cstrong data-start=\"3973\" data-end=\"4012\"\u003eExplicitly NOT for \/ not listed on:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"4014\" data-end=\"4388\"\u003e\n\u003cli data-start=\"4014\" data-end=\"4141\"\u003e\n\u003cp data-start=\"4016\" data-end=\"4141\"\u003e\u003cstrong data-start=\"4016\" data-end=\"4085\"\u003eClassic 350 J-Series, Bullet 350 J-Series, Hunter 350, Meteor 350\u003c\/strong\u003e (BS6 J-platform – EFI, different throttle body\/carb).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4142\" data-end=\"4232\"\u003e\n\u003cp data-start=\"4144\" data-end=\"4232\"\u003e\u003cstrong data-start=\"4144\" data-end=\"4194\"\u003eClassic 500 \/ Bullet 500 \/ Thunderbird 500 EFI\u003c\/strong\u003e (Keihin UCD33 EFI, no carb float).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4233\" data-end=\"4388\"\u003e\n\u003cp data-start=\"4235\" data-end=\"4388\"\u003e\u003cstrong data-start=\"4235\" data-end=\"4333\"\u003eHimalayan \/ Scram 411, 650 Twins, Super Meteor 650, Shotgun 650, Himalayan 450 \/ Guerrilla 450\u003c\/strong\u003e – no evidence of 500843 usage in their parts fiches.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4390\" data-end=\"4393\"\u003e\n\u003ch3 data-start=\"4395\" data-end=\"4407\"\u003eVariants\u003c\/h3\u003e\n\u003cul data-start=\"4409\" data-end=\"4629\"\u003e\n\u003cli data-start=\"4409\" data-end=\"4436\"\u003e\n\u003cp data-start=\"4411\" data-end=\"4436\"\u003e\u003cstrong data-start=\"4411\" data-end=\"4427\"\u003ePart number:\u003c\/strong\u003e 500843\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4437\" data-end=\"4529\"\u003e\n\u003cp data-start=\"4439\" data-end=\"4529\"\u003e\u003cstrong data-start=\"4439\" data-end=\"4466\"\u003eDescription (official):\u003c\/strong\u003e Float Assembly \/ Float Assly T1 – CV Carb with needle valve\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4530\" data-end=\"4629\"\u003e\n\u003cp data-start=\"4532\" data-end=\"4629\"\u003e\u003cstrong data-start=\"4532\" data-end=\"4557\"\u003eCommon seller naming:\u003c\/strong\u003e “Float Body – Carburettor 500843”, “Float Body CV Carburetor 500843”\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4631\" data-end=\"4679\"\u003eSingle OEM variant; no LH\/RH or colour variants.\u003c\/p\u003e\n\u003chr data-start=\"4681\" data-end=\"4684\"\u003e\n\u003ch3 data-start=\"4686\" data-end=\"4707\"\u003eWhat’s in the Box\u003c\/h3\u003e\n\u003cul data-start=\"4709\" data-end=\"4906\"\u003e\n\u003cli data-start=\"4709\" data-end=\"4906\"\u003e\n\u003cp data-start=\"4711\" data-end=\"4906\"\u003e1 × \u003cstrong data-start=\"4715\" data-end=\"4766\"\u003eRoyal Enfield 500843 – Float Assembly (CV Carb)\u003c\/strong\u003e\u003cbr data-start=\"4766\" data-end=\"4769\"\u003e\u003cem data-start=\"4771\" data-end=\"4906\"\u003e(float + hinge + needle valve as supplied by OE; jets, bowl, gaskets and screws are not included unless shown in your product photos)\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4908\" data-end=\"4911\"\u003e\n\u003ch3 data-start=\"4913\" data-end=\"4935\"\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul data-start=\"4937\" data-end=\"5446\"\u003e\n\u003cli data-start=\"4937\" data-end=\"5018\"\u003e\n\u003cp data-start=\"4939\" data-end=\"5018\"\u003eRecommended to be installed during a full \u003cstrong data-start=\"4981\" data-end=\"5015\"\u003ecarburettor service \/ overhaul\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5019\" data-end=\"5102\"\u003e\n\u003cp data-start=\"5021\" data-end=\"5102\"\u003eRemove carb, drain fuel, and open float bowl; inspect jets, gasket and O-rings.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5103\" data-end=\"5217\"\u003e\n\u003cp data-start=\"5105\" data-end=\"5217\"\u003eReplace old float assembly with 500843, ensuring hinge pin and needle seat are clean and correctly positioned.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5218\" data-end=\"5309\"\u003e\n\u003cp data-start=\"5220\" data-end=\"5309\"\u003eCheck float height as per workshop manual specs for your model before closing the bowl.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5310\" data-end=\"5446\"\u003e\n\u003cp data-start=\"5312\" data-end=\"5446\"\u003eAfter reassembly, verify there is \u003cstrong data-start=\"5346\" data-end=\"5366\"\u003eno fuel overflow\u003c\/strong\u003e from the drain\/overflow pipe and test-ride for smooth throttle and stable idle.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"5448\" data-end=\"5451\"\u003e\n\u003ch3 data-start=\"5453\" data-end=\"5467\"\u003eFAQs\u003c\/h3\u003e\n\u003cp data-start=\"5469\" data-end=\"5798\"\u003e\u003cstrong data-start=\"5469\" data-end=\"5527\"\u003e1. What exactly does part 500843 do in my carburettor?\u003c\/strong\u003e\u003cbr data-start=\"5527\" data-end=\"5530\"\u003e500843 is the \u003cstrong data-start=\"5544\" data-end=\"5580\"\u003efloat assembly with needle valve\u003c\/strong\u003e for the BS29 CV carb. It controls the fuel level inside the float bowl by opening\/closing the needle against the seat. If the float leaks or the needle doesn’t seal, you get overflow, rich running and poor mileage.\u003c\/p\u003e\n\u003chr data-start=\"5800\" data-end=\"5803\"\u003e\n\u003cp data-start=\"5805\" data-end=\"6166\"\u003e\u003cstrong data-start=\"5805\" data-end=\"5866\"\u003e2. How do I know if I need to replace the float assembly?\u003c\/strong\u003e\u003cbr data-start=\"5866\" data-end=\"5869\"\u003eTypical symptoms include \u003cstrong data-start=\"5894\" data-end=\"5936\"\u003epetrol dripping from the carb overflow\u003c\/strong\u003e, frequent plug fouling, very rich exhaust smell, hard hot-starting, or the bike only running with choke. If cleaning doesn’t help and the float is fuel-logged or needle is worn, replacing with genuine 500843 is the correct fix.\u003c\/p\u003e\n\u003chr data-start=\"6168\" data-end=\"6171\"\u003e\n\u003cp data-start=\"6173\" data-end=\"6467\"\u003e\u003cstrong data-start=\"6173\" data-end=\"6236\"\u003e3. Will 500843 fit my Classic 350 BS6 (new J-Series model)?\u003c\/strong\u003e\u003cbr data-start=\"6236\" data-end=\"6239\"\u003eNo. The new BS6 \u003cstrong data-start=\"6255\" data-end=\"6279\"\u003eJ-Series Classic 350\u003c\/strong\u003e uses a different engine and EFI throttle body, not the older BS29 CV carb. 500843 is only for carbureted UCE 350 models (Classic 350 UCE, Bullet 350 UCE, Electra 350, Thunderbird 350).\u003c\/p\u003e\n\u003chr data-start=\"6469\" data-end=\"6472\"\u003e\n\u003cp data-start=\"6474\" data-end=\"6768\"\u003e\u003cstrong data-start=\"6474\" data-end=\"6544\"\u003e4. Is this also the right part for Classic 500 or Thunderbird 500?\u003c\/strong\u003e\u003cbr data-start=\"6544\" data-end=\"6547\"\u003eNo. Classic 500 \/ Thunderbird 500 use \u003cstrong data-start=\"6585\" data-end=\"6619\"\u003eKeihin UCD33 EFI throttle body\u003c\/strong\u003e, and do not have a CV carb float like this. The UCE parts catalogue lists 500843 under carb parts for 350 UCE, not under the 500 EFI fuel system.\u003c\/p\u003e\n\u003chr data-start=\"6770\" data-end=\"6773\"\u003e\n\u003cp data-start=\"6775\" data-end=\"7103\"\u003e\u003cstrong data-start=\"6775\" data-end=\"6863\"\u003e5. Some sellers call it “float body” and others “float assembly” – which is correct?\u003c\/strong\u003e\u003cbr data-start=\"6863\" data-end=\"6866\"\u003eRoyal Enfield’s own PDFs call 500843 \u003cstrong data-start=\"6903\" data-end=\"6970\"\u003e“Float Assembly \/ Float Assly T1 – CV Carb (with needle valve)”\u003c\/strong\u003e. Some online shops label it loosely as “float body”, but the function is the same – it’s the complete float unit for the CV carb.\u003c\/p\u003e","brand":"UNDER THE HOOD","offers":[{"title":"Default Title","offer_id":50762064822567,"sku":null,"price":430.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/500843_float_body_carburettor_part_for_Bullet_350_UCE_and_Electra_350.png?v=1764413757","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-500843-float-assembly-cv-carb-classic-bullet-350-uce","provider":"UNDER THE HOOD","version":"1.0","type":"link"}