{"product_id":"hero-33k112s-cd100-ss-050-second-oversize-piston-ring-kit","title":"Hero Genuine 33K112S 0.50 (2nd Oversize) Piston \u0026 Ring Kit for CD100 SS \/ 100 SS – Piston, Rings, Pin \u0026 Clips","description":"\u003ch2\u003eHero Genuine 33K112S 0.50 Second Oversize Piston \u0026amp; Ring Kit for CD100 SS \/ 100 SS\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eHero 33K112S\u003c\/strong\u003e is the genuine \u003cstrong\u003eII-Over Size \/ 0.50 mm oversize piston and ring kit\u003c\/strong\u003e for the older \u003cstrong\u003eHero \/ Hero Honda CD100 SS, later referred to as 100 SS\u003c\/strong\u003e application supported by current specialist fitment references.\u003c\/p\u003e\n\n\u003cp\u003eThis is \u003cstrong\u003enot a standard-size piston kit\u003c\/strong\u003e. It is intended for an engine whose cylinder has been correctly measured and machined \/ bored for the \u003cstrong\u003esecond oversize (+0.50 mm)\u003c\/strong\u003e specification. Order this kit only after the bore size has been confirmed by the mechanic or machine shop.\u003c\/p\u003e\n\n\u003cdiv style=\"padding:12px;border:1px solid #d32f2f;background:#fff5f5;margin:14px 0;\"\u003e\n\u003cstrong\u003eCritical buyer check:\u003c\/strong\u003e \u003cstrong\u003e33K112S = 0.50 mm \/ II-Over Size.\u003c\/strong\u003e Do not order it for a standard bore or a 0.25 mm first-oversize bore. Hero separately lists \u003cstrong\u003e33K110S = Standard\u003c\/strong\u003e and \u003cstrong\u003e33K111S = 0.25 mm I-Over Size\u003c\/strong\u003e.\n\u003c\/div\u003e\n\n\u003ch3\u003eQuick Product Details\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" style=\"width:100%;border-collapse:collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHero MotoCorp Genuine Parts\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\u003e\u003cstrong\u003e33K112S\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOfficial Hero Description\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePiston Ring Set \/ Piston Ring Kit II-Over Size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOversize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e+0.50 mm \/ Second Oversize \/ II-Over Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConfirmed Application\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCD100 SS \/ 100 SS\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine Class\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 cc application\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePack Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eComplete piston replacement kit as described by Hero\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\u003eHero Listed Net 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\u003eHero Listed Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e158 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent Hero MRP\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e₹685 incl. taxes\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eConfirmed Compatibility\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" style=\"width:100%;border-collapse:collapse;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eMotorcycle\u003c\/th\u003e\n\u003cth\u003eFitment\u003c\/th\u003e\n\u003cth\u003eImportant Requirement\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHero Honda \/ Hero CD100 SS\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eConfirmed by multiple current specialist references\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOnly when the engine requires the \u003cstrong\u003e+0.50 mm second-oversize\u003c\/strong\u003e piston kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003eHero 100 SS\u003c\/strong\u003e (later naming for CD100 SS application)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eConfirmed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOnly when the engine requires the \u003cstrong\u003e+0.50 mm second-oversize\u003c\/strong\u003e piston kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo not broaden this fitment to every Hero 100 cc motorcycle.\u003c\/strong\u003e Hero's current e-shop page describes 33K112S generically as a 100 cc application, but independent model-specific references consistently map this exact part number to \u003cstrong\u003eCD100 SS \/ 100 SS\u003c\/strong\u003e. This listing therefore stays conservative.\u003c\/p\u003e\n\n\u003ch3\u003eWhat Does “0.50 \/ Second Oversize” Mean?\u003c\/h3\u003e\n\u003cp\u003eA piston is not chosen only by motorcycle model. During an engine rebuild, the cylinder bore must be measured. If the cylinder has worn beyond the standard-size service limit, a machine shop may rebore \/ hone it to an approved oversize.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e33K112S is the +0.50 mm second-oversize kit.\u003c\/strong\u003e It should be used only when the cylinder bore has been prepared for that exact size.\u003c\/p\u003e\n\n\u003cp\u003eIf the cylinder is still standard size, or has only been bored to +0.25 mm, this kit is incorrect even if the motorcycle is a CD100 SS.\u003c\/p\u003e\n\n\u003ch3\u003eHero Size Cross-Reference – Do Not Order the Wrong Piston\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" style=\"width:100%;border-collapse:collapse;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eHero Part Number\u003c\/th\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eUse\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e33K110S\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eStandard-bore application\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e33K111S\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+0.25 mm\u003c\/td\u003e\n\u003ctd\u003eI-Over Size \/ First Oversize\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e33K112S\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e+0.50 mm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eII-Over Size \/ Second Oversize – THIS PRODUCT\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eImportant: Do Not Confuse 33K112S with 33K122S\u003c\/h3\u003e\n\u003cp\u003eHero also lists \u003cstrong\u003e33K122S\u003c\/strong\u003e as a separate \u003cstrong\u003eII-Over Size (Y2K)\u003c\/strong\u003e piston-ring kit for \u003cstrong\u003eSplendor+\u003c\/strong\u003e. That is a different Hero part number.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e33K112S is not being sold here as a Splendor+ piston kit.\u003c\/strong\u003e If you have a Splendor \/ Splendor+ or another 100 cc Hero model, match the exact engine application and Hero part number before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eWhat Comes in the Kit?\u003c\/h3\u003e\n\u003cp\u003eHero's current product page describes 33K112S as a complete piston-ring-set replacement package and lists:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003ePiston\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePiston ring set\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePiston pin \/ gudgeon pin\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eRetaining clip(s)\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eHero also describes the package as a multi-component \/ five-part kit. This listing therefore treats 33K112S as a \u003cstrong\u003ecomplete piston-and-ring service kit\u003c\/strong\u003e, not as loose piston rings only.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Would a Buyer Need This Kit?\u003c\/h3\u003e\n\u003cp\u003eThis part is normally considered during an engine top-end rebuild after the cylinder and piston have been inspected and measured.\u003c\/p\u003e\n\n\u003cp\u003eCommon reasons a mechanic may recommend piston \/ ring and bore work include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLow compression\u003c\/li\u003e\n\u003cli\u003eExcessive engine-oil consumption\u003c\/li\u003e\n\u003cli\u003eBlue exhaust smoke caused by worn piston \/ ring \/ bore condition\u003c\/li\u003e\n\u003cli\u003ePoor cylinder sealing\u003c\/li\u003e\n\u003cli\u003eLoss of engine performance linked to compression wear\u003c\/li\u003e\n\u003cli\u003ePiston or ring damage\u003c\/li\u003e\n\u003cli\u003eExcessive cylinder wear requiring reboring\u003c\/li\u003e\n\u003cli\u003eTop-end overhaul after seizure or scoring\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThese symptoms do \u003cstrong\u003enot automatically prove that 0.50 mm oversize is required\u003c\/strong\u003e. The cylinder must be measured before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Bore Measurement Comes Before Buying\u003c\/h3\u003e\n\u003cp\u003eOversize piston kits are precision engine-rebuild parts. The correct sequence is:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eOpen and inspect the engine.\u003c\/li\u003e\n\u003cli\u003eMeasure the cylinder bore and wear \/ taper \/ scoring.\u003c\/li\u003e\n\u003cli\u003eDetermine whether the cylinder remains standard or requires reboring.\u003c\/li\u003e\n\u003cli\u003eConfirm the required oversize: Standard, +0.25 mm, +0.50 mm, etc.\u003c\/li\u003e\n\u003cli\u003eOrder the matching piston kit.\u003c\/li\u003e\n\u003cli\u003eMachine \/ finish the bore to the piston manufacturer's required clearance and workshop specification.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo not buy a +0.50 piston kit first and assume it will fit an untouched standard cylinder.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eBuyer Search Names for 33K112S\u003c\/h3\u003e\n\u003cp\u003eWorkshops and owners may search this same product using different terms, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCD100 SS piston kit 0.50\u003c\/li\u003e\n\u003cli\u003eCD100 0.50 piston\u003c\/li\u003e\n\u003cli\u003eHero Honda CD100 SS second oversize piston\u003c\/li\u003e\n\u003cli\u003eCD100 piston ring kit 0.50\u003c\/li\u003e\n\u003cli\u003eCD100 2nd oversize piston kit\u003c\/li\u003e\n\u003cli\u003e100 SS piston kit\u003c\/li\u003e\n\u003cli\u003eHero 33K112S\u003c\/li\u003e\n\u003cli\u003e33K112S piston set\u003c\/li\u003e\n\u003cli\u003e33K112S piston ring kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose Hero Genuine for an Engine Rebuild?\u003c\/h3\u003e\n\u003cp\u003ePiston-to-cylinder clearance, ring fit, pin fit and component dimensions are critical during an engine rebuild. Using the exact Hero part number helps the mechanic work from the intended specification rather than relying on a visually similar aftermarket kit.\u003c\/p\u003e\n\n\u003cp\u003eCorrect part selection still does not replace proper cylinder measurement and machining.\u003c\/p\u003e\n\n\u003ch3\u003eFitment \/ Return Prevention\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBefore ordering, confirm all of the following:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMotorcycle is the supported \u003cstrong\u003eCD100 SS \/ 100 SS\u003c\/strong\u003e application\u003c\/li\u003e\n\u003cli\u003eExact Hero part number required is \u003cstrong\u003e33K112S\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCylinder requires \u003cstrong\u003e+0.50 mm \/ II-Over Size\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMechanic \/ machine shop has measured the bore\u003c\/li\u003e\n\u003cli\u003eYou are not actually looking for \u003cstrong\u003e33K110S Standard\u003c\/strong\u003e or \u003cstrong\u003e33K111S +0.25\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eYou are not looking for the separate \u003cstrong\u003e33K122S Y2K \/ Splendor+\u003c\/strong\u003e application\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor old engines with previous rebuild history, the safest check is the \u003cstrong\u003epart number + existing piston marking + measured bore\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Note\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eProfessional engine rebuilding \/ machining is strongly recommended.\u003c\/strong\u003e A second-oversize piston kit must be matched to the correctly prepared cylinder bore and installed with the correct piston-to-bore clearance, ring orientation, ring end gap, piston-pin installation and engine assembly procedure.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eMeasure the bore before machining.\u003c\/li\u003e\n\u003cli\u003eConfirm piston size before final honing.\u003c\/li\u003e\n\u003cli\u003eCheck ring end gaps according to service specifications.\u003c\/li\u003e\n\u003cli\u003eInstall rings in the correct orientation.\u003c\/li\u003e\n\u003cli\u003eUse the correct piston direction \/ marking.\u003c\/li\u003e\n\u003cli\u003eInstall retaining clips securely.\u003c\/li\u003e\n\u003cli\u003eUse new gaskets \/ seals where the engine service requires them.\u003c\/li\u003e\n\u003cli\u003eFollow correct tightening torque and engine-break-in procedure after rebuild.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat You Will Receive\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e1 × Hero Genuine 33K112S II-Over Size 0.50 Piston \u0026amp; Ring Kit\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eHero's product description lists piston, piston ring(s), pin and clip(s) as the included replacement components.\u003c\/p\u003e\n\n\u003ch3\u003eBuyer-Focused FAQs\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is Hero 33K112S?\u003c\/strong\u003e\u003cbr\u003e\nIt is Hero's genuine \u003cstrong\u003eII-Over Size \/ +0.50 mm piston and ring kit\u003c\/strong\u003e for the supported 100 SS \/ CD100 SS application.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes 33K112S fit Hero Honda CD100 SS?\u003c\/strong\u003e\u003cbr\u003e\nYes, current specialist fitment references specifically map 33K112S to \u003cstrong\u003eCD100 SS \/ 100 SS\u003c\/strong\u003e. It is correct only when the engine requires the +0.50 mm second-oversize piston.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs 33K112S a standard-size piston?\u003c\/strong\u003e\u003cbr\u003e\n\u003cstrong\u003eNo.\u003c\/strong\u003e 33K112S is +0.50 mm second oversize.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhich Hero part number is standard size?\u003c\/strong\u003e\u003cbr\u003e\nHero lists \u003cstrong\u003e33K110S\u003c\/strong\u003e as the Standard piston ring \/ piston kit for the related 100 cc series.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhich part number is +0.25 mm first oversize?\u003c\/strong\u003e\u003cbr\u003e\nHero lists \u003cstrong\u003e33K111S\u003c\/strong\u003e as the +0.25 mm I-Over Size kit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat does “II-Over Size” mean?\u003c\/strong\u003e\u003cbr\u003e\nIt means second oversize. For 33K112S, Hero specifies \u003cstrong\u003e0.50 mm oversize\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I install 33K112S in a standard cylinder?\u003c\/strong\u003e\u003cbr\u003e\nNo. The cylinder must be measured and correctly prepared for the +0.50 mm piston size.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes 33K112S fit Splendor Plus?\u003c\/strong\u003e\u003cbr\u003e\nThis listing does \u003cstrong\u003enot\u003c\/strong\u003e claim Splendor+ fitment. Hero separately lists \u003cstrong\u003e33K122S\u003c\/strong\u003e as the II-Over Size Y2K kit for Splendor+.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes it fit every Hero 100 cc motorcycle?\u003c\/strong\u003e\u003cbr\u003e\nNo. Although Hero's current shop page describes it generically as a 100 cc kit, the model-specific references checked map 33K112S to CD100 SS \/ 100 SS. Do not generalise by engine capacity alone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the kit include the piston or only rings?\u003c\/strong\u003e\u003cbr\u003e\nHero's current product page lists \u003cstrong\u003episton, piston ring(s), pin and clip(s)\u003c\/strong\u003e, so this is a complete piston-service kit rather than loose rings only.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the current Hero MRP?\u003c\/strong\u003e\u003cbr\u003e\nHero's current official e-shop lists \u003cstrong\u003e₹685 inclusive of taxes\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eShould I order 0.50 just because the engine is smoking?\u003c\/strong\u003e\u003cbr\u003e\nNo. Smoke can have multiple causes. The cylinder and piston must be inspected and measured before choosing an oversize.\u003c\/p\u003e","brand":"Hero MotoCorp","offers":[{"title":"Default Title","offer_id":51877231493415,"sku":"33K112S","price":685.0,"currency_code":"INR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/25608500-3049-47E9-A4A2-0FA38706E47D.jpg?v=1786790133","url":"https:\/\/underthehood.co.in\/products\/hero-33k112s-cd100-ss-050-second-oversize-piston-ring-kit","provider":"UNDER THE HOOD","version":"1.0","type":"link"}