{"product_id":"hero-engine-cylinder-block-12100aanb00s","title":"Hero Genuine Engine Cylinder Block for Xtreme 125R OBD-II | 12100AANB00S","description":"\u003ch2\u003eHero Genuine Engine Cylinder Block – 12100AANB00S\u003c\/h2\u003e\n\u003cp\u003eThis listing is for the Hero Genuine \u003cstrong\u003eEngine Cylinder Block\u003c\/strong\u003e identified by exact part number \u003cstrong\u003e12100AANB00S\u003c\/strong\u003e. Select this component by complete part number and chassis\/VIN-based EPC confirmation—not by visual similarity, shared engine capacity or a broad model-family name.\u003c\/p\u003e\n\n\u003ch3\u003eConfirmed Compatibility\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCompatibility is limited to the exact EPC-supported applications listed below.\u003c\/strong\u003e Do not assume compatibility with another model, generation or variant merely because the component looks similar or shares an engine family.\u003c\/p\u003e\n\u003cul\u003e\u003cli\u003eHero Xtreme 125R OBD-II (Apr 2025)\u003c\/li\u003e\u003c\/ul\u003e\n\n\u003ch3\u003eFitment Note \/ Return Prevention Note\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMatch every letter, number and suffix in the SKU.\u003c\/li\u003e\n\u003cli\u003eConfirm the exact motorcycle or scooter model, variant, production generation and applicable EPC assembly.\u003c\/li\u003e\n\u003cli\u003eCompare the old part's side, connector, mounting points, dimensions and surrounding components before opening the package.\u003c\/li\u003e\n\u003cli\u003eDo not install, energise, fill, lubricate, machine or modify the component merely to test compatibility.\u003c\/li\u003e\n\u003cli\u003eInstalled, electrically tested, fuel-exposed, oil-exposed, marked, scratched or modified parts cannot be treated as unused returns.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat This Product Is\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHero Genuine engine cylinder block \/ barrel assembly\u003c\/li\u003e\n\u003cli\u003eOfficial description: \u003cstrong\u003eCylinder Comp.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHero part number: \u003cstrong\u003e12100AANB00S\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCatalogue-format part number: \u003cstrong\u003e12100-AAN-B00\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCommon buyer names: cylinder block, cylinder barrel, engine block, bore block and cylinder body\u003c\/li\u003e\n\u003cli\u003eEngine location: between the crankcase and cylinder head\u003c\/li\u003e\n\u003cli\u003ePrimary function: guides the piston and forms the engine’s working cylinder bore\u003c\/li\u003e\n\u003cli\u003eCatalogue quantity: one cylinder per compatible engine\u003c\/li\u003e\n\u003cli\u003eSupply form: one manufacturer-packed cylinder assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGenuine Hero internal-engine component\u003c\/li\u003e\n\u003cli\u003ePrecision-machined bore and mounting surfaces\u003c\/li\u003e\n\u003cli\u003eSupports correct piston movement and combustion sealing when assembled with matching parts\u003c\/li\u003e\n\u003cli\u003eSuitable replacement when the original cylinder is scored, seized, cracked or outside service limits\u003c\/li\u003e\n\u003cli\u003eModel-specific cylinder height, bore, stud pattern and oil-passage arrangement\u003c\/li\u003e\n\u003cli\u003eExact OEM part-number matching reduces wrong-cylinder and wrong-gasket orders\u003c\/li\u003e\n\u003cli\u003eOne cylinder block assembly supplied\u003c\/li\u003e\n\u003cli\u003eCurrent Hero MRP reference: ₹2,490 inclusive of taxes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat You Will Receive\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 × Hero Genuine Cylinder Comp.\u003c\/li\u003e\n\u003cli\u003ePart number: \u003cstrong\u003e12100AANB00S\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eOne manufacturer-packed cylinder block \/ barrel assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePiston\u003c\/li\u003e\n\u003cli\u003ePiston-ring set\u003c\/li\u003e\n\u003cli\u003ePiston pin\u003c\/li\u003e\n\u003cli\u003ePiston-pin clips\u003c\/li\u003e\n\u003cli\u003eCylinder-base gasket\u003c\/li\u003e\n\u003cli\u003eCylinder-head gasket\u003c\/li\u003e\n\u003cli\u003eCylinder head\u003c\/li\u003e\n\u003cli\u003eValves, camshaft or rocker components\u003c\/li\u003e\n\u003cli\u003eCam chain, tensioner or guides\u003c\/li\u003e\n\u003cli\u003eConnecting rod or crankshaft\u003c\/li\u003e\n\u003cli\u003eStuds, dowels, nuts, washers or bolts unless physically present in the sealed pack\u003c\/li\u003e\n\u003cli\u003eEngine oil\u003c\/li\u003e\n\u003cli\u003eMachining, honing or boring work\u003c\/li\u003e\n\u003cli\u003eInstallation labour\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Details\u003c\/h3\u003e\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHero Genuine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHero MotoCorp Limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12100AANB00S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCatalogue Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12100-AAN-B00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOfficial Description\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCylinder Comp.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommon Buyer Terms\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCylinder block, cylinder barrel, engine block, bore block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine Area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBetween crankcase and cylinder head\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrimary Function\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGuides the piston and provides the working cylinder bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCatalogue Quantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 per compatible engine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNet Retail Quantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eListed Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1,799 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eListed Package Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e17 × 15 × 13 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndia\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMRP Reference\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e₹2,490 inclusive of taxes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRing Set Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGaskets Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo, unless physically present in the sealed pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGoogle Shopping MPN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12100AANB00S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eInstallation Note\u003c\/h3\u003e\u003cp\u003eCylinder replacement requires complete top-end engine dismantling, precision measurement and correct cam-timing assembly. Installation should be performed by a trained Hero motorcycle engine technician.\u003c\/p\u003e\n\u003ch4\u003eBefore Installation\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm the old and new cylinder part numbers\u003c\/li\u003e\n\u003cli\u003eInspect the crankcase cylinder seating surface\u003c\/li\u003e\n\u003cli\u003eMeasure the piston and confirm the matching piston number\u003c\/li\u003e\n\u003cli\u003eInspect the piston skirt and ring grooves\u003c\/li\u003e\n\u003cli\u003eCheck the piston pin and connecting-rod small end\u003c\/li\u003e\n\u003cli\u003eMeasure piston-to-cylinder clearance\u003c\/li\u003e\n\u003cli\u003eCheck every ring’s end gap in the replacement cylinder\u003c\/li\u003e\n\u003cli\u003eObtain new model-correct cylinder-base and head gaskets\u003c\/li\u003e\n\u003cli\u003eInspect the cylinder-head sealing surface\u003c\/li\u003e\n\u003cli\u003eCheck the cam chain, tensioner and guides\u003c\/li\u003e\n\u003cli\u003eIdentify the root cause of the original cylinder damage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eDuring Installation\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eClean all mating surfaces without gouging the aluminium\u003c\/li\u003e\n\u003cli\u003eDo not use excessive sealant\u003c\/li\u003e\n\u003cli\u003eInstall the correct dowels and gaskets\u003c\/li\u003e\n\u003cli\u003eLubricate the piston, rings and cylinder with clean specified engine oil\u003c\/li\u003e\n\u003cli\u003eInstall piston rings in the correct grooves and orientation\u003c\/li\u003e\n\u003cli\u003ePosition ring gaps according to the service procedure\u003c\/li\u003e\n\u003cli\u003eUse a proper ring compressor or approved installation method\u003c\/li\u003e\n\u003cli\u003eDo not force the cylinder over the piston rings\u003c\/li\u003e\n\u003cli\u003eRoute the cam chain correctly through the cylinder tunnel\u003c\/li\u003e\n\u003cli\u003eSet cam timing exactly\u003c\/li\u003e\n\u003cli\u003eTighten cylinder-head fasteners in the prescribed sequence and torque\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eAfter Installation\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eRotate the engine manually before starting\u003c\/li\u003e\n\u003cli\u003eRecheck cam timing and valve clearance\u003c\/li\u003e\n\u003cli\u003eFill with the specified engine oil\u003c\/li\u003e\n\u003cli\u003eConfirm adequate lubrication\u003c\/li\u003e\n\u003cli\u003eCheck engine compression\u003c\/li\u003e\n\u003cli\u003eListen for piston slap, knocking or abnormal mechanical noise\u003c\/li\u003e\n\u003cli\u003eInspect for oil and compression leakage\u003c\/li\u003e\n\u003cli\u003eMonitor engine temperature\u003c\/li\u003e\n\u003cli\u003eFollow the technician’s recommended running-in procedure\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBuyer-Focused FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow should fitment be confirmed?\u003c\/strong\u003e\u003cbr\u003eMatch the complete part number with the motorcycle's chassis\/VIN-based Hero EPC. A shared model name, appearance or engine capacity is not enough.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the part be installed only to check compatibility?\u003c\/strong\u003e\u003cbr\u003eNo. Confirm the EPC, physical design and related assembly before opening or installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat will be supplied?\u003c\/strong\u003e\u003cbr\u003eOne Hero Genuine component under part number \u003cstrong\u003e12100AANB00S\u003c\/strong\u003e, subject to the exact contents of the sealed manufacturer package.\u003c\/p\u003e","brand":"Hero MotoCorp","offers":[{"title":"Default Title","offer_id":51785842524455,"sku":"12100AANB00S","price":2490.0,"currency_code":"INR","in_stock":true}],"url":"https:\/\/underthehood.co.in\/products\/hero-engine-cylinder-block-12100aanb00s","provider":"UNDER THE HOOD","version":"1.0","type":"link"}