{"product_id":"royal-enfield-500866-pilot-jet-15-classic-350-bullet-350-thunderbird-350","title":"Royal Enfield 500866 – Pilot Jet-15 (CV Carb BS26) for Classic 350 BS4, Bullet 350 ES Disc, Thunderbird X 350 Disc \u0026 Thunderbird 350 ABS (Final UCE)","description":"\u003cp data-start=\"517\" data-end=\"876\"\u003eThe \u003cstrong data-start=\"521\" data-end=\"555\"\u003eRoyal Enfield 500866 Pilot Jet\u003c\/strong\u003e is the genuine \u003cstrong data-start=\"571\" data-end=\"623\"\u003eslow jet (Pilot Jet-15) for BS26 CV carburettors\u003c\/strong\u003e used on select 346cc UCE 350 models and some earlier CI\/AVL platforms. Multiple OEM-focused catalogs and dealer sites list this part as \u003cstrong data-start=\"760\" data-end=\"792\"\u003e“PILOT JET-15 CV CARB BS-26”\u003c\/strong\u003e or \u003cstrong data-start=\"796\" data-end=\"831\"\u003e“Pilot jet (Slow Jet) BS 26-15”\u003c\/strong\u003e, confirming the jet size and carb family.\u003c\/p\u003e\n\u003cp data-start=\"878\" data-end=\"1003\"\u003e500866 appears as \u003cstrong data-start=\"959\" data-end=\"974\"\u003e“pilot jet”\u003c\/strong\u003e and is mapped directly to:\u003c\/p\u003e\n\u003cul data-start=\"1005\" data-end=\"1309\"\u003e\n\u003cli data-start=\"1005\" data-end=\"1048\"\u003e\n\u003cp data-start=\"1007\" data-end=\"1048\"\u003e\u003cstrong data-start=\"1007\" data-end=\"1046\"\u003eBullet 350 ES Disc – BS4 – VNCR42MS\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1049\" data-end=\"1084\"\u003e\n\u003cp data-start=\"1051\" data-end=\"1084\"\u003e\u003cstrong data-start=\"1051\" data-end=\"1082\"\u003eClassic 350 – BS4 – 1800366\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1085\" data-end=\"1141\"\u003e\n\u003cp data-start=\"1087\" data-end=\"1141\"\u003e\u003cstrong data-start=\"1087\" data-end=\"1139\"\u003eThunderbird X 350 Disc – BS4 – 1800321 \u0026amp; 1800379\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1142\" data-end=\"1309\"\u003e\n\u003cp data-start=\"1144\" data-end=\"1309\"\u003e\u003cstrong data-start=\"1144\" data-end=\"1189\"\u003eThunderbird 350 ABS – final UCE ABS model\u003c\/strong\u003e (portal internally labels this as “BSVI”, but this is still the last-gen UCE Thunderbird, not a separate BS6 platform).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1311\" data-end=\"1426\"\u003eThis is the \u003cstrong data-start=\"1323\" data-end=\"1372\"\u003efactory slow jet for those BS4 UCE carb bikes\u003c\/strong\u003e, ensuring correct fuelling at idle and just-off-idle.\u003c\/p\u003e\n\u003cp data-start=\"1428\" data-end=\"1740\"\u003e\u003cstrong data-start=\"1484\" data-end=\"1514\"\u003ePILOT JET-15 CV CARB BS-26\u003c\/strong\u003e suitable for \u003cstrong data-start=\"1528\" data-end=\"1592\"\u003eMachismo A350, Machismo A500 and Thunderbird 350 (2002–2012)\u003c\/strong\u003e, all BS26 CV-carb models. \u003c\/p\u003e\n\u003cp data-start=\"1742\" data-end=\"1924\"\u003eReplacing a clogged or worn pilot jet can transform a rough, stalling 350 into a bike that \u003cstrong data-start=\"1833\" data-end=\"1895\"\u003estarts easily, idles smoothly and pulls cleanly in traffic\u003c\/strong\u003e—with no guesswork jet sizes.\u003c\/p\u003e\n\u003chr data-start=\"1926\" data-end=\"1929\"\u003e\n\u003ch2 data-start=\"1931\" data-end=\"1946\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"1948\" data-end=\"3256\"\u003e\n\u003cli data-start=\"1948\" data-end=\"2083\"\u003e\n\u003cp data-start=\"1950\" data-end=\"2083\"\u003e\u003cstrong data-start=\"1950\" data-end=\"1985\"\u003eGenuine Royal Enfield pilot jet\u003c\/strong\u003e – Official OEM description \u003cstrong data-start=\"2013\" data-end=\"2045\"\u003e“PILOT JET-15 CV CARB BS-26”\u003c\/strong\u003e, reference part number \u003cstrong data-start=\"2069\" data-end=\"2079\"\u003e500866\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2084\" data-end=\"2214\"\u003e\n\u003cp data-start=\"2086\" data-end=\"2214\"\u003e\u003cstrong data-start=\"2086\" data-end=\"2123\"\u003eCorrect slow jet for BS26 CV carb\u003c\/strong\u003e – Designed for BS26 CV carburettors used on specific 350cc UCE and older CI\/AVL models.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2215\" data-end=\"2445\"\u003e\n\u003cp data-start=\"2217\" data-end=\"2445\"\u003e\u003cstrong data-start=\"2217\" data-end=\"2251\"\u003eConfirmed BS4 UCE 350 coverage\u003c\/strong\u003e – RE portal maps 500866 to \u003cstrong data-start=\"2279\" data-end=\"2408\"\u003eClassic 350 BS4, Bullet 350 ES Disc BS4, Thunderbird X 350 Disc BS4 (two codes) and Thunderbird 350 ABS (final UCE ABS model)\u003c\/strong\u003e as per your microfiche screenshot.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2446\" data-end=\"2619\"\u003e\n\u003cp data-start=\"2448\" data-end=\"2619\"\u003e\u003cstrong data-start=\"2448\" data-end=\"2486\"\u003eImproves idle and low-rpm response\u003c\/strong\u003e – A fresh pilot jet fixes \u003cstrong data-start=\"2513\" data-end=\"2585\"\u003ehard starting, lumpy idle, hesitation off-idle and frequent stalling\u003c\/strong\u003e caused by worn or blocked jets.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2620\" data-end=\"2774\"\u003e\n\u003cp data-start=\"2622\" data-end=\"2774\"\u003e\u003cstrong data-start=\"2622\" data-end=\"2647\"\u003eOEM drilling and flow\u003c\/strong\u003e – Factory-spec orifice and length give the correct fuel flow; unlike non-OE jets which are often off-size and hard to tune.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2775\" data-end=\"2930\"\u003e\n\u003cp data-start=\"2777\" data-end=\"2930\"\u003e\u003cstrong data-start=\"2777\" data-end=\"2819\"\u003eIdeal for carb\/throttle body overhauls\u003c\/strong\u003e – Best replaced when servicing or rebuilding BS26 CV units, especially on high-mileage or long-stored bikes.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3167\" data-end=\"3256\"\u003e\n\u003cp data-start=\"3169\" data-end=\"3256\"\u003e\u003cstrong data-start=\"3169\" data-end=\"3196\"\u003eSingle-piece OE packing\u003c\/strong\u003e – Supplied as one pilot jet in sealed, traceable packaging.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3258\" data-end=\"3261\"\u003e\n\u003ch2 data-start=\"3263\" data-end=\"3285\"\u003eCompatibility Table\u003c\/h2\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=\"3378\" data-end=\"4252\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"3378\" data-end=\"3511\"\u003e\n\u003ctr data-start=\"3378\" data-end=\"3511\"\u003e\n\u003cth data-start=\"3378\" data-end=\"3408\" data-col-size=\"sm\"\u003eModel\u003c\/th\u003e\n\u003cth data-start=\"3408\" data-end=\"3428\" data-col-size=\"sm\"\u003eEngine \/ Platform\u003c\/th\u003e\n\u003cth data-start=\"3428\" data-end=\"3449\" data-col-size=\"sm\"\u003eFuel \/ Carb\u003c\/th\u003e\n\u003cth data-start=\"3449\" data-end=\"3475\" data-col-size=\"sm\"\u003eEmission Stage (market)\u003c\/th\u003e\n\u003cth data-start=\"3475\" data-end=\"3511\" data-col-size=\"lg\"\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"3646\" data-end=\"4252\"\u003e\n\u003ctr data-start=\"3646\" data-end=\"3778\"\u003e\n\u003ctd data-start=\"3646\" data-end=\"3676\" data-col-size=\"sm\"\u003eClassic 350 (India BS4)\u003c\/td\u003e\n\u003ctd data-start=\"3676\" data-end=\"3696\" data-col-size=\"sm\"\u003e346cc UCE 2-valve\u003c\/td\u003e\n\u003ctd data-start=\"3696\" data-end=\"3717\" data-col-size=\"sm\"\u003eBS26 CV carb\u003c\/td\u003e\n\u003ctd data-start=\"3717\" data-end=\"3743\" data-col-size=\"sm\"\u003eBS4\u003c\/td\u003e\n\u003ctd data-start=\"3743\" data-end=\"3778\" data-col-size=\"lg\"\u003eVariant code 1800366\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3779\" data-end=\"3911\"\u003e\n\u003ctd data-start=\"3779\" data-end=\"3809\" data-col-size=\"sm\"\u003eBullet 350 ES Disc (BS4)\u003c\/td\u003e\n\u003ctd data-start=\"3809\" data-end=\"3829\" data-col-size=\"sm\"\u003e346cc UCE\u003c\/td\u003e\n\u003ctd data-start=\"3829\" data-end=\"3850\" data-col-size=\"sm\"\u003eBS26 CV carb\u003c\/td\u003e\n\u003ctd data-start=\"3850\" data-end=\"3876\" data-col-size=\"sm\"\u003eBS4\u003c\/td\u003e\n\u003ctd data-start=\"3876\" data-end=\"3911\" data-col-size=\"lg\"\u003eVariant code VNCR42MS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3912\" data-end=\"4044\"\u003e\n\u003ctd data-start=\"3912\" data-end=\"3942\" data-col-size=\"sm\"\u003eThunderbird X 350 Disc\u003c\/td\u003e\n\u003ctd data-start=\"3942\" data-end=\"3962\" data-col-size=\"sm\"\u003e346cc UCE\u003c\/td\u003e\n\u003ctd data-start=\"3962\" data-end=\"3983\" data-col-size=\"sm\"\u003eBS26 CV carb\u003c\/td\u003e\n\u003ctd data-start=\"3983\" data-end=\"4009\" data-col-size=\"sm\"\u003eBS4\u003c\/td\u003e\n\u003ctd data-start=\"4009\" data-end=\"4044\" data-col-size=\"lg\"\u003eVariant codes 1800321 \u0026amp; 1800379\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"4045\" data-end=\"4252\"\u003e\n\u003ctd data-start=\"4045\" data-end=\"4075\" data-col-size=\"sm\"\u003eThunderbird 350 ABS (final)\u003c\/td\u003e\n\u003ctd data-start=\"4075\" data-end=\"4095\" data-col-size=\"sm\"\u003e346cc UCE\u003c\/td\u003e\n\u003ctd data-start=\"4095\" data-end=\"4116\" data-col-size=\"sm\"\u003eBS26 CV carb\u003c\/td\u003e\n\u003ctd data-start=\"4116\" data-end=\"4142\" data-col-size=\"sm\"\u003eLast UCE ABS model*\u003c\/td\u003e\n\u003ctd data-start=\"4142\" data-end=\"4252\" data-col-size=\"lg\"\u003eShown as “BSVI” internally on portal but is the final UCE Thunderbird 350, \u003cstrong data-start=\"4219\" data-end=\"4226\"\u003enot\u003c\/strong\u003e a separate BS6 platform\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=\"4254\" data-end=\"4354\"\u003e*For your listing text, call it \u003cstrong data-start=\"4287\" data-end=\"4330\"\u003e“Thunderbird 350 ABS (final UCE model)”\u003c\/strong\u003e, not “Thunderbird BS6”.\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=\"4431\" data-end=\"5033\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"4431\" data-end=\"4518\"\u003e\n\u003ctr data-start=\"4431\" data-end=\"4518\"\u003e\n\u003cth data-start=\"4431\" data-end=\"4454\" data-col-size=\"sm\"\u003eModel\u003c\/th\u003e\n\u003cth data-start=\"4454\" data-end=\"4481\" data-col-size=\"sm\"\u003eEngine \/ Carb Platform\u003c\/th\u003e\n\u003cth data-start=\"4481\" data-end=\"4499\" data-col-size=\"sm\"\u003eYears (approx.)\u003c\/th\u003e\n\u003cth data-start=\"4499\" data-end=\"4518\" data-col-size=\"md\"\u003eSource \u0026amp; Status\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"4607\" data-end=\"5033\"\u003e\n\u003ctr data-start=\"4607\" data-end=\"4780\"\u003e\n\u003ctd data-start=\"4607\" data-end=\"4630\" data-col-size=\"sm\"\u003eMachismo A350\u003c\/td\u003e\n\u003ctd data-start=\"4630\" data-end=\"4657\" data-col-size=\"sm\"\u003e346cc CI\/AVL, BS26 CV\u003c\/td\u003e\n\u003ctd data-start=\"4657\" data-end=\"4675\" data-col-size=\"sm\"\u003e1999–2005\u003c\/td\u003e\n\u003ctd data-start=\"4675\" data-end=\"4780\" data-col-size=\"md\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"4781\" data-end=\"4887\"\u003e\n\u003ctd data-start=\"4781\" data-end=\"4804\" data-col-size=\"sm\"\u003eMachismo A500\u003c\/td\u003e\n\u003ctd data-start=\"4804\" data-end=\"4831\" data-col-size=\"sm\"\u003e499cc CI\/AVL, BS26 CV\u003c\/td\u003e\n\u003ctd data-start=\"4831\" data-end=\"4849\" data-col-size=\"sm\"\u003e2009\u003c\/td\u003e\n\u003ctd data-start=\"4849\" data-end=\"4887\" data-col-size=\"md\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"4888\" data-end=\"5033\"\u003e\n\u003ctd data-start=\"4888\" data-end=\"4911\" data-col-size=\"sm\"\u003eThunderbird 350 (CI)\u003c\/td\u003e\n\u003ctd data-start=\"4911\" data-end=\"4938\" data-col-size=\"sm\"\u003e346cc CI\/AVL, BS26 CV\u003c\/td\u003e\n\u003ctd data-start=\"4938\" data-end=\"4956\" data-col-size=\"sm\"\u003e2002–2012\u003c\/td\u003e\n\u003ctd data-start=\"4956\" data-end=\"5033\" data-col-size=\"md\"\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=\"5035\" data-end=\"5205\"\u003e\u003cstrong data-start=\"5035\" data-end=\"5047\"\u003eNot for:\u003c\/strong\u003e J-Series Classic\/Bullet\/Meteor\/Hunter 350, Himalayan\/Scram 411, Himalayan 450\/Guerrilla 450, 650 Twins or any EFI-only model (these do not use BS26 CV jets).\u003c\/p\u003e\n\u003cp data-start=\"5035\" data-end=\"5205\"\u003e\u003cspan style=\"color: rgb(255, 21, 21);\"\u003e\u003cstrong\u003eCHECK PART NUMBER BEFORE PURCHASE \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"5207\" data-end=\"5210\"\u003e\n\u003ch2 data-start=\"5212\" data-end=\"5223\"\u003eVariants\u003c\/h2\u003e\n\u003cul data-start=\"5225\" data-end=\"5418\"\u003e\n\u003cli data-start=\"5225\" data-end=\"5252\"\u003e\n\u003cp data-start=\"5227\" data-end=\"5252\"\u003e\u003cstrong data-start=\"5227\" data-end=\"5243\"\u003ePart Number:\u003c\/strong\u003e 500866\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5253\" data-end=\"5340\"\u003e\n\u003cp data-start=\"5255\" data-end=\"5340\"\u003e\u003cstrong data-start=\"5255\" data-end=\"5274\"\u003eOE Description:\u003c\/strong\u003e \u003cem data-start=\"5275\" data-end=\"5303\"\u003ePilot Jet-15 CV Carb BS-26\u003c\/em\u003e \/ \u003cem data-start=\"5306\" data-end=\"5337\"\u003ePilot jet (Slow Jet) BS 26-15\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5341\" data-end=\"5384\"\u003e\n\u003cp data-start=\"5343\" data-end=\"5384\"\u003e\u003cstrong data-start=\"5343\" data-end=\"5356\"\u003eJet Size:\u003c\/strong\u003e 15 (slow \/ pilot circuit)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5385\" data-end=\"5418\"\u003e\n\u003cp data-start=\"5387\" data-end=\"5418\"\u003e\u003cstrong data-start=\"5387\" data-end=\"5400\"\u003eQuantity:\u003c\/strong\u003e 1 pc (single jet)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"5420\" data-end=\"5423\"\u003e\n\u003ch2 data-start=\"5425\" data-end=\"5432\"\u003eFAQs\u003c\/h2\u003e\n\u003cp data-start=\"5434\" data-end=\"5753\"\u003e\u003cstrong data-start=\"5434\" data-end=\"5484\"\u003eQ1. What exactly does the 500866 pilot jet do?\u003c\/strong\u003e\u003cbr data-start=\"5484\" data-end=\"5487\"\u003eIt meters \u003cstrong data-start=\"5497\" data-end=\"5546\"\u003efuel at idle and very small throttle openings\u003c\/strong\u003e in the BS26 CV carb. When it’s blocked or worn, you’ll see hard starting, poor idle, and hesitation as you crack the throttle. Replacing it with a fresh 500866 brings the low-rpm mixture back to OE spec.\u003c\/p\u003e\n\u003chr data-start=\"5755\" data-end=\"5758\"\u003e\n\u003cp data-start=\"5760\" data-end=\"6089\"\u003e\u003cstrong data-start=\"5760\" data-end=\"5823\"\u003eQ2. Which bikes are 100% safe for 500866 with no guesswork?\u003c\/strong\u003e\u003cbr data-start=\"5823\" data-end=\"5826\"\u003eFrom the Royal Enfield spares microfiche (screenshot), it belongs on \u003cstrong data-start=\"5895\" data-end=\"6051\"\u003eClassic 350 BS4 (1800366), Bullet 350 ES Disc BS4 (VNCR42MS), Thunderbird X 350 Disc BS4 (1800321\/1800379) and Thunderbird 350 ABS – final UCE ABS model\u003c\/strong\u003e. These you can list as \u003cstrong data-start=\"6075\" data-end=\"6088\"\u003econfirmed\u003c\/strong\u003e.\u003c\/p\u003e\n\u003chr data-start=\"6091\" data-end=\"6094\"\u003e\n\u003cp data-start=\"6096\" data-end=\"6525\"\u003e\u003cstrong data-start=\"6096\" data-end=\"6180\"\u003eQ3. Why do some sellers show Machismo and old Thunderbird 350 for the same part?\u003c\/strong\u003e\u003cbr data-start=\"6180\" data-end=\"6183\"\u003eCHECK PART NUMBER BEFORE PURCHASE \u003c\/p\u003e\n\u003chr data-start=\"6527\" data-end=\"6530\"\u003e\n\u003cp data-start=\"6532\" data-end=\"6748\"\u003e\u003cstrong data-start=\"6532\" data-end=\"6598\"\u003eQ4. Does this fit J-Series Classic 350 Reborn or Bullet 350 J?\u003c\/strong\u003e\u003cbr data-start=\"6598\" data-end=\"6601\"\u003eNo. All J-Series models use a different EFI system and do \u003cstrong data-start=\"6659\" data-end=\"6666\"\u003enot\u003c\/strong\u003e reference 500866 in their parts microfiche. For them, this jet is not applicable.\u003c\/p\u003e\n\u003chr data-start=\"6750\" data-end=\"6753\"\u003e\n\u003cp data-start=\"6755\" data-end=\"7119\"\u003e\u003cstrong data-start=\"6755\" data-end=\"6824\"\u003eQ5. Do I need re-jetting if I install 500866 on a stock BS4 bike?\u003c\/strong\u003e\u003cbr data-start=\"6824\" data-end=\"6827\"\u003eIf your bike is stock (airbox, exhaust) and you’re just replacing a clogged jet with the same OEM size (15), you do \u003cstrong data-start=\"6943\" data-end=\"6950\"\u003enot\u003c\/strong\u003e need to change other jets—just clean the carb, fit 500866 and reset idle and pilot screw. Re-jetting is only required for heavy intake\/exhaust mods or altitude changes.\u003c\/p\u003e","brand":"UNDER THE HOOD","offers":[{"title":"Default Title","offer_id":50761695625511,"sku":null,"price":92.0,"currency_code":"INR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/500866_slow_jet_CV_carb_for_Bullet_350_ES_Disc_and_Thunderbird_X_350.jpg?v=1764408494","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-500866-pilot-jet-15-classic-350-bullet-350-thunderbird-350","provider":"UNDER THE HOOD","version":"1.0","type":"link"}