{"product_id":"hero-passion-pro-cylinder-kit-21k220s","title":"Hero Genuine Cylinder Kit for Passion Pro | Bore Kit \/ Block Piston Kit with Piston | 21K220S","description":"\u003ch2\u003eHero Genuine Cylinder Kit for Passion Pro | Bore Kit \/ Block Piston Kit with Piston | 21K220S\u003c\/h2\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eIf your \u003cstrong\u003eHero Passion Pro\u003c\/strong\u003e has low compression, piston noise, smoke from the silencer, weak pickup, or high oil consumption, this \u003cstrong\u003eHero Genuine Cylinder Kit\u003c\/strong\u003e is the correct OEM rebuild option for restoring the top end of the engine.\u003c\/p\u003e\n\u003cp\u003eThis is genuine Hero part number \u003cstrong\u003e21K220S\u003c\/strong\u003e. Your actual stock box clearly mentions \u003cstrong\u003eCYLINDER KIT (PASSION PRO)\u003c\/strong\u003e, so this listing is built as a \u003cstrong\u003ePassion Pro-specific cylinder kit\u003c\/strong\u003e, not as a broad HF or Splendor family kit. In buyer language, customers may search this as a \u003cstrong\u003ecylinder kit\u003c\/strong\u003e, \u003cstrong\u003ebore kit\u003c\/strong\u003e, \u003cstrong\u003eblock piston kit\u003c\/strong\u003e, \u003cstrong\u003episton-cylinder kit\u003c\/strong\u003e, or \u003cstrong\u003eengine rebuild kit\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThis kit is ideal when the old cylinder and piston are worn and the bike has started losing power, burning oil, or producing piston slap noise. Compared with local aftermarket bore kits, a genuine Hero kit gives stronger buyer confidence for machining accuracy, part matching, and rebuild reliability. Public seller references also support a Passion Pro-specific positioning for \u003cstrong\u003e21K220S\u003c\/strong\u003e, which aligns with the printed box description on your stock.\u003c\/p\u003e\n\u003cp\u003eThis listing stays tightly focused on \u003cstrong\u003ePassion Pro\u003c\/strong\u003e to reduce wrong orders and improve buyer confidence.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Hero part number \u003cstrong\u003e21K220S\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eBox-marked as \u003cstrong\u003eCylinder Kit (Passion Pro)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eOEM top-end rebuild kit for Passion Pro\u003c\/li\u003e\n\u003cli\u003eCommon buyer search terms covered: \u003cstrong\u003ebore kit\u003c\/strong\u003e, \u003cstrong\u003eblock piston kit\u003c\/strong\u003e, \u003cstrong\u003ecylinder kit\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eUseful for low compression, smoke, power loss, and worn bore rebuilds\u003c\/li\u003e\n\u003cli\u003eBetter trust and fitment confidence than generic aftermarket kits\u003c\/li\u003e\n\u003cli\u003eComplete rebuild-style pack with cylinder, piston-related parts, and gaskets\u003c\/li\u003e\n\u003cli\u003eGood search intent match for \u003cstrong\u003ePassion Pro cylinder kit\u003c\/strong\u003e and \u003cstrong\u003ePassion Pro bore kit\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eConfirmed Compatibility\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eCompatibility Status\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHero Passion Pro\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003ctd\u003eBox clearly says CYLINDER KIT (PASSION PRO)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHF Dawn\u003c\/td\u003e\n\u003ctd\u003eNot listed\u003c\/td\u003e\n\u003ctd\u003eDo not sell from this listing without separate verification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHF Deluxe\u003c\/td\u003e\n\u003ctd\u003eNot listed\u003c\/td\u003e\n\u003ctd\u003eDo not sell from this listing without separate verification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSplendor Plus\u003c\/td\u003e\n\u003ctd\u003eNot listed\u003c\/td\u003e\n\u003ctd\u003eDo not sell from this listing without separate verification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePassion Plus \/ other Hero commuters\u003c\/td\u003e\n\u003ctd\u003eNot confirmed\u003c\/td\u003e\n\u003ctd\u003eMatch old part and verify separately before sale\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable class=\"table table-bordered dataTable no-footer\" id=\"tableForApplicableModels\" role=\"grid\" aria-describedby=\"tableForApplicableModels_info\"\u003e\n\u003ctbody id=\"applicableModelsforIDD\"\u003e\n\u003ctr role=\"row\" class=\"odd\"\u003e\n\u003cth class=\"sorting_1\"\u003e1\u003c\/th\u003e\n\u003ctd\u003e\u003ca\u003eHF Deluxe (Nov, 2013)\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\" class=\"even\"\u003e\n\u003cth class=\"sorting_1\"\u003e2\u003c\/th\u003e\n\u003ctd\u003e\u003ca\u003ePassion Pro (Jan, 2014)\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\" class=\"odd\"\u003e\n\u003cth class=\"sorting_1\"\u003e3\u003c\/th\u003e\n\u003ctd\u003e\u003ca\u003eSplendor iSmart (Dec, 2013)\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"panel-heading\"\u003e\n\u003cdiv class=\"panel-title\" id=\"panel-heading\"\u003e\n\u003ch4 class=\"modal-title\"\u003e\n\u003cspan class=\"bhutranslate\" data-langkey=\"label.menu.component.componentpartlist\"\u003eParts List for\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\"\u003cspan class=\"partNoID\"\u003e21K220S\u003c\/span\u003e\"\u003c\/h4\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tableinside\"\u003e\n\u003cdiv id=\"tableForPartsList_wrapper\" class=\"dataTables_wrapper form-inline dt-bootstrap no-footer\"\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"col-sm-12\"\u003e\n\u003ctable class=\"table table-bordered dataTable no-footer\" id=\"tableForPartsList\" role=\"grid\" aria-describedby=\"tableForPartsList_info\"\u003e\n\u003cthead\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth class=\"bhutranslate sorting_asc\" data-langkey=\"label.menu.component.component.sno\" aria-controls=\"tableForPartsList\" rowspan=\"1\" colspan=\"1\" aria-sort=\"ascending\" aria-label=\"S.No: activate to sort column descending\" tabindex=\"0\"\u003eS.No\u003c\/th\u003e\n\u003cth class=\"bhutranslate sorting\" data-langkey=\"label.menu.component.component.partno\" aria-controls=\"tableForPartsList\" rowspan=\"1\" colspan=\"1\" aria-label=\"Part No : activate to sort column ascending\" tabindex=\"0\"\u003ePart No\u003c\/th\u003e\n\u003cth class=\"bhutranslate sorting\" data-langkey=\"label.menu.component.component.description\" aria-controls=\"tableForPartsList\" rowspan=\"1\" colspan=\"1\" aria-label=\"Description : activate to sort column ascending\" tabindex=\"0\"\u003eDescription\u003c\/th\u003e\n\u003cth class=\"bhutranslate sorting\" data-langkey=\"label.menu.component.component.qty\" aria-controls=\"tableForPartsList\" rowspan=\"1\" colspan=\"1\" aria-label=\"Qty: activate to sort column ascending\" tabindex=\"0\"\u003eQty\u003c\/th\u003e\n\u003cth class=\"bhutranslate sorting\" data-langkey=\"label.menu.component.component.partimage\" aria-controls=\"tableForPartsList\" rowspan=\"1\" colspan=\"1\" aria-label=\"Part Image: activate to sort column ascending\" tabindex=\"0\"\u003ePart Image\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody id=\"partsListIDD\"\u003e\n\u003ctr role=\"row\" class=\"odd\"\u003e\n\u003cth class=\"sorting_1\"\u003e1\u003c\/th\u003e\n\u003ctd\u003e\u003ca\u003e12251-KST-94099\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003eGASKET CYLINDER HEAD\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e\u003cimg class=\"part-image\" src=\"https:\/\/ecatalogue.heromotocorp.biz\/sol_dealer\/dealer\/ecat_print\/part_image\/12251-KST-94099.jpg\" width=\"50px\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\" class=\"even\"\u003e\n\u003cth class=\"sorting_1\"\u003e2\u003c\/th\u003e\n\u003ctd\u003e\u003ca\u003e12391-AAH-00099\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003eGASKET CYL HEAD COVER\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e\u003cimg class=\"part-image\" src=\"https:\/\/ecatalogue.heromotocorp.biz\/sol_dealer\/dealer\/ecat_print\/part_image\/12391-AAH-00099.jpg\" width=\"50px\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\" class=\"odd\"\u003e\n\u003cth class=\"sorting_1\"\u003e3\u003c\/th\u003e\n\u003ctd\u003e\u003ca\u003e13011-KCC-942\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003eRING SET, PISTON (STD)\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e\u003cimg class=\"part-image\" src=\"https:\/\/ecatalogue.heromotocorp.biz\/sol_dealer\/dealer\/ecat_print\/part_image\/13011-KCC-942.jpg\" width=\"50px\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\" class=\"even\"\u003e\n\u003cth class=\"sorting_1\"\u003e4\u003c\/th\u003e\n\u003ctd\u003e\u003ca\u003e13101-KCC-901\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003ePISTON\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e\u003cimg class=\"part-image\" src=\"https:\/\/ecatalogue.heromotocorp.biz\/sol_dealer\/dealer\/ecat_print\/part_image\/13101-KCC-901.jpg\" width=\"50px\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\" class=\"odd\"\u003e\n\u003cth class=\"sorting_1\"\u003e5\u003c\/th\u003e\n\u003ctd\u003e\u003ca\u003e13111-087-000\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003ePIN, PISTON\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e\u003cimg class=\"part-image\" src=\"https:\/\/ecatalogue.heromotocorp.biz\/sol_dealer\/dealer\/ecat_print\/part_image\/13111-087-000.jpg\" width=\"50px\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\" class=\"even\"\u003e\n\u003cth class=\"sorting_1\"\u003e6\u003c\/th\u003e\n\u003ctd\u003e\u003ca\u003e13115-001-000\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003eCLIP, PISTON PIN\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e\u003cimg class=\"part-image\" src=\"https:\/\/ecatalogue.heromotocorp.biz\/sol_dealer\/dealer\/ecat_print\/part_image\/13115-001-000.jpg\" width=\"50px\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\" class=\"odd\"\u003e\n\u003cth class=\"sorting_1\"\u003e7\u003c\/th\u003e\n\u003ctd\u003e\u003ca\u003e12101-KST-940\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003eCYLINDER\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e\u003cimg class=\"part-image\" src=\"https:\/\/ecatalogue.heromotocorp.biz\/sol_dealer\/dealer\/ecat_print\/part_image\/12101-KST-940.jpg\" width=\"50px\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\" class=\"even\"\u003e\n\u003cth class=\"sorting_1\"\u003e8\u003c\/th\u003e\n\u003ctd\u003e\u003ca\u003e12191-AAH-F0099\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003eGASKET CYLINDER\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e\u003cimg class=\"part-image\" src=\"https:\/\/ecatalogue.heromotocorp.biz\/sol_dealer\/dealer\/ecat_print\/part_image\/12191-AAH-F0099.jpg\" width=\"50px\"\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\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat’s in the Box\u003c\/h3\u003e\n\u003cp\u003eBased on the printed contents on your box and what is visible in the photos:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCylinder – 1\u003c\/li\u003e\n\u003cli\u003eGasket cyl head cover – 1\u003c\/li\u003e\n\u003cli\u003eGasket cyl head – 1\u003c\/li\u003e\n\u003cli\u003eGasket cylinder – 1\u003c\/li\u003e\n\u003cli\u003ePiston set \u003cstrong\u003e(STD)\u003c\/strong\u003e – 1\u003c\/li\u003e\n\u003cli\u003eRing set piston \u003cstrong\u003e(STD)\u003c\/strong\u003e – 1\u003c\/li\u003e\n\u003cli\u003ePin set – 1\u003c\/li\u003e\n\u003cli\u003ePiston pin clip – 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Hero Genuine Parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 21K220S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name on Box:\u003c\/strong\u003e Cylinder Kit (Passion Pro)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Engine cylinder \/ bore kit with piston components\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNet Quantity:\u003c\/strong\u003e 1 number\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMRP on box:\u003c\/strong\u003e ₹1719.00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing Date on box:\u003c\/strong\u003e 03\/2026\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification visible on pack:\u003c\/strong\u003e STD\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation \/ Fitment Note\u003c\/h3\u003e\n\u003cp\u003eThis is an engine rebuild part and should be installed by a mechanic. Before ordering, match:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ebike model as \u003cstrong\u003ePassion Pro\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eold cylinder\/piston application\u003c\/li\u003e\n\u003cli\u003ebore specification\u003c\/li\u003e\n\u003cli\u003eengine rebuild requirement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBecause this is a precision engine part, buyers should not order only by visual similarity.\u003c\/p\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ1. What is 21K220S?\u003c\/strong\u003e\u003cbr\u003eIt is a genuine Hero \u003cstrong\u003ecylinder kit \/ bore kit\u003c\/strong\u003e for \u003cstrong\u003ePassion Pro\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2. Is this really for Passion Pro?\u003c\/strong\u003e\u003cbr\u003eYes. Your actual stock box clearly says \u003cstrong\u003eCYLINDER KIT (PASSION PRO)\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3. What comes inside this kit?\u003c\/strong\u003e\u003cbr\u003eThe box shows cylinder, piston set, piston ring set, pin set, pin clips, and gaskets.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ4. Is this a full bore kit?\u003c\/strong\u003e\u003cbr\u003eYes. It is sold as a complete cylinder kit for top-end rebuild work.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ5. What does STD mean here?\u003c\/strong\u003e\u003cbr\u003eThe pack markings visible in your photos show \u003cstrong\u003eSTD\u003c\/strong\u003e, indicating standard-size application.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ6. When do I need this kit?\u003c\/strong\u003e\u003cbr\u003eUsually when the bike has low compression, oil burning, smoke, weak pickup, or cylinder-piston wear.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ7. Can I order this for HF Deluxe or Splendor Plus?\u003c\/strong\u003e\u003cbr\u003eNo. This stock should be sold as \u003cstrong\u003ePassion Pro only\u003c\/strong\u003e unless separately verified.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ8. What should be matched before ordering?\u003c\/strong\u003e\u003cbr\u003eMatch the old cylinder\/piston application and confirm with your mechanic before purchase.\u003c\/p\u003e","brand":"Hero","offers":[{"title":"Default Title","offer_id":51238765855015,"sku":"21K220S","price":2600.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/E2213A5E-2B6D-439A-A847-51E1F0809E2E.jpg?v=1775333166","url":"https:\/\/underthehood.co.in\/products\/hero-passion-pro-cylinder-kit-21k220s","provider":"UNDER THE HOOD","version":"1.0","type":"link"}