{"product_id":"royal-enfield-600004a-piston-barrel-assembly-350-uce","title":"Royal Enfield 600004\/A – Piston Barrel Assembly (Standard Bore) – Genuine OEM for 350cc UCE Models","description":"\u003cp data-start=\"313\" data-end=\"352\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eRestore your Royal Enfield's engine to factory standards with the \u003cstrong data-start=\"66\" data-end=\"117\"\u003e600004\/A Piston Barrel Assembly (Standard Bore)\u003c\/strong\u003e—a genuine OEM component that includes both piston and cylinder barrel. Engineered to precise Royal Enfield specifications, this complete assembly guarantees exact fitment and reliable performance. Compatible with the 350cc UCE lineup—including \u003cstrong data-start=\"362\" data-end=\"377\"\u003eClassic 350\u003c\/strong\u003e, \u003cstrong data-start=\"379\" data-end=\"405\"\u003eBullet 350 (UCE KS\/ES)\u003c\/strong\u003e, \u003cstrong data-start=\"407\" data-end=\"422\"\u003eElectra 350\u003c\/strong\u003e, and \u003cstrong data-start=\"428\" data-end=\"447\"\u003eThunderbird 350\u003c\/strong\u003e—this kit simplifies overhauls, ensuring long-term durability and accuracy in compression. Whether you're rebuilding from wear or refreshing your bike's heart, this assembly delivers plug‑and‑play fitment for smooth, powerful operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"354\" data-end=\"357\"\u003e\n\u003ch2 data-start=\"359\" data-end=\"387\"\u003eVerified Compatibility\u003c\/h2\u003e\n\u003cul data-start=\"388\" data-end=\"595\"\u003e\n\u003cli data-start=\"388\" data-end=\"429\"\u003e\n\u003cp data-start=\"390\" data-end=\"429\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003e\u003cstrong data-start=\"0\" data-end=\"19\" data-is-only-node=\"\"\u003eClassic 350 UCE\u003c\/strong\u003e (all trim levels)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"430\" data-end=\"471\"\u003e\n\u003cp data-start=\"432\" data-end=\"471\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003e\u003cstrong data-start=\"0\" data-end=\"18\" data-is-only-node=\"\"\u003eBullet 350 UCE\u003c\/strong\u003e (KS \u0026amp; ES variants)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"472\" data-end=\"513\"\u003e\n\u003cp data-start=\"474\" data-end=\"513\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003e\u003cstrong data-start=\"0\" data-end=\"19\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eElectra 350 UCE\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"514\" data-end=\"595\"\u003e\n\u003cp data-start=\"516\" data-end=\"595\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003e\u003cstrong data-start=\"0\" data-end=\"23\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eThunderbird 350 UCE\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\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]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"597\" data-end=\"634\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eNot compatible with J‑Series (Reborn, Meteor, Hunter), Himalayan, 650 Twins, or 500cc models.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"636\" data-end=\"639\"\u003e\n\u003ch2 data-start=\"641\" data-end=\"659\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"660\" data-end=\"923\"\u003e\n\u003cli data-start=\"660\" data-end=\"703\"\u003e\n\u003cp data-start=\"662\" data-end=\"703\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003e\u003cstrong data-start=\"0\" data-end=\"20\" data-is-only-node=\"\"\u003eOEM Part Number:\u003c\/strong\u003e 600004\/A – Genuine piston \u0026amp; barrel set\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"704\" data-end=\"747\"\u003e\n\u003cp data-start=\"706\" data-end=\"747\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003e\u003cstrong data-start=\"0\" data-end=\"22\" data-is-only-node=\"\"\u003eStandard Bore Size\u003c\/strong\u003e – Restores original engine geometry and compression\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"748\" data-end=\"791\"\u003e\n\u003cp data-start=\"750\" data-end=\"791\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003e\u003cstrong data-start=\"0\" data-end=\"16\" data-is-only-node=\"\"\u003eComplete Kit\u003c\/strong\u003e – Includes piston, barrel, piston rings, and pin (if applicable)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"792\" data-end=\"835\"\u003e\n\u003cp data-start=\"794\" data-end=\"835\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003e\u003cstrong data-start=\"0\" data-end=\"35\" data-is-only-node=\"\"\u003eHigh‑Grade Aluminum \u0026amp; Cast Iron\u003c\/strong\u003e – Durable, precision-machined for performance\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"836\" data-end=\"879\"\u003e\n\u003cp data-start=\"838\" data-end=\"879\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003e\u003cstrong data-start=\"0\" data-end=\"25\" data-is-only-node=\"\"\u003ePlug‑and‑Play Fitment\u003c\/strong\u003e – Direct factory replacement without modification\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"880\" data-end=\"923\"\u003e\n\u003cp data-start=\"882\" data-end=\"923\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003e\u003cstrong data-start=\"0\" data-end=\"42\" data-is-only-node=\"\"\u003eOptimized for Indian Riding Conditions\u003c\/strong\u003e – Designed for heat and load resilience\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"1322\" data-end=\"1332\"\u003eFAQs\u003c\/h2\u003e\n\u003cp data-start=\"1334\" data-end=\"1463\"\u003e\u003cstrong data-start=\"1334\" data-end=\"1379\"\u003eQ1: Which 350cc models does 600004\/A fit?\u003c\/strong\u003e\u003cbr data-start=\"1379\" data-end=\"1382\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eIt fits all UCE 350cc models—Classic, Bullet (KS\/ES), Electra, and Thunderbird.\u003c\/span\u003e \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]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1465\" data-end=\"1549\"\u003e\u003cstrong data-start=\"1465\" data-end=\"1505\"\u003eQ2: What’s included in the assembly?\u003c\/strong\u003e\u003cbr data-start=\"1505\" data-end=\"1508\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eThis is a comprehensive kit with both the cylinder barrel and standard‑bore piston (rings and pin included).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1551\" data-end=\"1663\"\u003e\u003cstrong data-start=\"1551\" data-end=\"1579\"\u003eQ3: Is this genuine OEM?\u003c\/strong\u003e\u003cbr data-start=\"1579\" data-end=\"1582\"\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eYes—600004\/A is a factory-supplied Royal Enfield part.\u003c\/span\u003e \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]\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1665\" data-end=\"1788\"\u003e\u003cstrong data-start=\"1665\" data-end=\"1699\"\u003eQ4: Does it require machining?\u003c\/strong\u003e\u003cbr data-start=\"1699\" data-end=\"1702\"\u003eNo—this is a direct OEM swap. Just clean the mount, apply fresh gasket, and bolt on.\u003c\/p\u003e\n\u003cp data-start=\"1790\" data-end=\"1927\"\u003e\u003cstrong data-start=\"1790\" data-end=\"1821\"\u003eQ5: Will it fit EFI models?\u003c\/strong\u003e\u003cbr data-start=\"1821\" data-end=\"1824\"\u003eYes—it fits EFI (fuel-injected) UCE variants, as long as they use the standard 350 UCE engine platform.\u003c\/p\u003e","brand":"UNDER THE HOOD","offers":[{"title":"Default Title","offer_id":50292729774375,"sku":null,"price":7000.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/566DC950-50FA-41ED-9E97-7A2FBF979F38.jpg?v=1772540955","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-600004a-piston-barrel-assembly-350-uce","provider":"UNDER THE HOOD","version":"1.0","type":"link"}