{"product_id":"hero-hf-deluxe-passion-pro-splendor-plus-cylinder-kit-k12121aahah00s","title":"Hero HF Deluxe \/ Passion Pro \/ Splendor Plus Cylinder Kit | Genuine Block Piston Kit | K12121AAHAH00S","description":"\u003ch2\u003eHero HF Deluxe \/ Passion Pro \/ Splendor Plus Cylinder Kit – K12121AAHAH00S\u003c\/h2\u003e\n\n\u003cp\u003eRestore engine compression and rebuild a worn or damaged cylinder section with the \u003cstrong\u003eHero Genuine Cylinder Kit K12121AAHAH00S\u003c\/strong\u003e. This genuine Hero engine kit is best supported for selected \u003cstrong\u003eHF Deluxe, HF Deluxe iBS, Passion Pro, and Splendor Plus\u003c\/strong\u003e applications, particularly model references from approximately \u003cstrong\u003e2016–2019\u003c\/strong\u003e, where this exact part number is specified.\u003c\/p\u003e\n\n\u003cp\u003eThis product is commonly searched as \u003cstrong\u003eHF Deluxe block piston kit, HF Deluxe cylinder kit, Passion Pro cylinder kit, Splendor Plus block piston kit, Hero bore kit, Hero engine cylinder kit, piston cylinder kit, block piston assembly, and K12121AAHAH00S\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eWhat This Product Is\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHero Genuine engine cylinder kit\u003c\/li\u003e\n\u003cli\u003eCatalogue description: \u003cstrong\u003eCYLINDER KIT\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePart number \/ MPN: \u003cstrong\u003eK12121AAHAH00S\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCommon market name: Cylinder kit \/ block piston kit \/ bore kit\u003c\/li\u003e\n\u003cli\u003eApplication area: Engine cylinder and piston section\u003c\/li\u003e\n\u003cli\u003eManufacturer: Hero MotoCorp\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Hero engine-rebuild component\u003c\/li\u003e\n\u003cli\u003eDesigned for the matching Hero 100 cc engine family\u003c\/li\u003e\n\u003cli\u003eUseful for diagnosed compression loss, worn cylinder bore, piston damage, excessive oil consumption, smoke, piston slap, or major engine overhaul\u003c\/li\u003e\n\u003cli\u003eHelps restore proper compression and combustion when installed with serviceable related components\u003c\/li\u003e\n\u003cli\u003eExact-SKU fitment offers better reliability than selecting a universal bore kit only by engine capacity\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBest-Supported Compatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHero HF Deluxe\u003c\/strong\u003e — selected applications where K12121AAHAH00S is specified\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHero HF Deluxe iBS\u003c\/strong\u003e — selected applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHero Passion Pro\u003c\/strong\u003e — selected applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHero Splendor Plus \/ Splendor+\u003c\/strong\u003e — selected applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHero Eco Deluxe i3S \/ equivalent export-market application\u003c\/strong\u003e where the exact part number is listed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003ePublic fitment records support HF Deluxe, HF Deluxe iBS, Passion Pro, and Splendor Plus applications around 2016–2019. Exact model-year and engine-code confirmation remains essential because these model families use multiple cylinder-kit revisions.\u003c\/p\u003e\n\n\u003ch3\u003eCritical Fitment and Return-Prevention Note\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, match \u003cstrong\u003eK12121AAHAH00S\u003c\/strong\u003e with the existing kit or Hero EPC\/VIN record. Also verify the motorcycle model, model year, engine family, cylinder design, piston specification, gasket arrangement, and fuel\/emission generation.\u003c\/p\u003e\n\n\u003cp\u003eDo not confuse this SKU with other Hero cylinder kits such as \u003cstrong\u003eK12121AANNB00S\u003c\/strong\u003e, \u003cstrong\u003eK12121AAWA000S\u003c\/strong\u003e, \u003cstrong\u003eK12121AATA000S\u003c\/strong\u003e, or other visually similar Hero kits. They may use different pistons, cylinder dimensions, coatings, gaskets, or engine applications.\u003c\/p\u003e\n\n\u003ch3\u003eKit Contents\u003c\/h3\u003e\n\u003cp\u003eThis product is identified as a \u003cstrong\u003eCYLINDER KIT\u003c\/strong\u003e. The exact bill of materials for K12121AAHAH00S is not clearly published in the reliable public sources reviewed. Only the components physically present inside the sealed Hero package should be promised as included.\u003c\/p\u003e\n\n\u003ch3\u003eWhat You Will Receive\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 × Hero Genuine Cylinder Kit\u003c\/li\u003e\n\u003cli\u003ePart number: \u003cstrong\u003eK12121AAHAH00S\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eOnly the parts packed inside the sealed Hero kit\u003c\/li\u003e\n\u003cli\u003eCylinder head, valves, camshaft, crankshaft, connecting rod, timing chain, clutch parts, engine oil, labour, and unrelated overhaul components are not included unless physically packed and explicitly stated\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Details\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHero MotoCorp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number \/ MPN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eK12121AAHAH00S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Description\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCYLINDER KIT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommon Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCylinder Kit \/ Block Piston Kit \/ Bore Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBest-Supported Models\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHF Deluxe, HF Deluxe iBS, Passion Pro, Splendor Plus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupported Model-Year Reference\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelected 2016–2019 applications; exact EPC confirmation required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePublic Seller Price References\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDifferent sellers show approximately ₹2,950 to ₹3,675; verify current packet MRP before publishing price\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKit BOM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNot reliably published for this exact SKU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFitment Sensitivity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eExact SKU, engine family, model year, piston\/cylinder specification, gasket layout, and EPC\/VIN must match\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eInstallation Note\u003c\/h3\u003e\n\u003cp\u003eProfessional engine installation is strongly recommended. Before assembly, inspect the cylinder head, valves, connecting rod, crankshaft play, oil pump, cam chain, guides, tensioner, studs, mating surfaces, and lubrication system. Confirm piston orientation, ring gaps, timing marks, torque values, and valve clearance before starting the engine.\u003c\/p\u003e\n\n\u003ch3\u003eBuyer-Focused FAQs\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ1. What is Hero part number K12121AAHAH00S?\u003c\/strong\u003e\u003cbr\u003e\nIt is a Hero Genuine Cylinder Kit used on selected HF Deluxe, HF Deluxe iBS, Passion Pro, and Splendor Plus applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ2. Does it fit every HF Deluxe or Splendor Plus?\u003c\/strong\u003e\u003cbr\u003e\nNo. These models have multiple engine and cylinder-kit revisions. Match the exact part number through the old packet, engine record, VIN, or Hero EPC.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ3. Is this a complete engine overhaul kit?\u003c\/strong\u003e\u003cbr\u003e\nNo. It is a cylinder kit, not a complete engine overhaul kit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ4. Are the piston, rings, pin, clips, and gaskets included?\u003c\/strong\u003e\u003cbr\u003e\nDo not promise individual contents until the sealed package is checked. The exact public BOM for this SKU could not be confirmed reliably.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ5. Can it be used for Hero Glamour or newer BS6 models?\u003c\/strong\u003e\u003cbr\u003e\nNo such fitment should be assumed. Use only where K12121AAHAH00S is confirmed.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ6. Should a mechanic install it?\u003c\/strong\u003e\u003cbr\u003e\nYes. Cylinder-kit replacement involves precision engine assembly, measurements, timing, lubrication, and torque procedures.\u003c\/p\u003e","brand":"Hero MotoCorp","offers":[{"title":"Default Title","offer_id":51773175300391,"sku":"K12121AAHAH00S","price":0.0,"currency_code":"INR","in_stock":true}],"url":"https:\/\/underthehood.co.in\/products\/hero-hf-deluxe-passion-pro-splendor-plus-cylinder-kit-k12121aahah00s","provider":"UNDER THE HOOD","version":"1.0","type":"link"}