{"product_id":"kb-pistons-super-duty-piston-4-125-bore-m8-114-117-to-120-std-824-01800","title":"Kb Pistons Super Duty Piston - 4.125\" Bore M8 114\/117 TO 120\" STD — Harley-Davidson (2017-2025)","description":"\u003cp\u003eKB Pistons Super Duty piston pair for M8 Harley-Davidson engines from 114 to 120 cubic inches, with 4.125\" bore and 1.2cc flat-top design. Built with anodized grooves, abradable skirt coating, and premium Hastings rings for tight clearances and quiet operation.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eAnodized top ring groove and crown\u003c\/li\u003e\n  \u003cli\u003eLine2Line abradable skirt coating (.003\" thickness) for zero initial fit\u003c\/li\u003e\n  \u003cli\u003eRound wire wrist pin locks\u003c\/li\u003e\n  \u003cli\u003ePremium Hastings 1.2mm\/1.2mm\/3.0mm steel nitride top ring with ductile Napier second ring\u003c\/li\u003e\n  \u003cli\u003eForced wrist pin oiling\u003c\/li\u003e\n  \u003cli\u003eFlat-top 1.2cc design with 1.083\" compression height\u003c\/li\u003e\n  \u003cli\u003eValve pockets sized for 1mm oversize valves\u003c\/li\u003e\n  \u003cli\u003eIncludes all rings, wrist pins, and locks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e KB Pistons\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e KB542LCA.STD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 4.125 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEngine:\u003c\/strong\u003e M8 (114-120 cu in)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e Flat-top, 1.2cc\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression Height:\u003c\/strong\u003e 1.083 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e Pair\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 6 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 5 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 5 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.5 lbs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Mexico\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits Harley-Davidson Milwaukee-Eight (M8) engines from 114 to 120 cubic inches with 4.125\" bore.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat's included in this kit?\u003c\/h3\u003e\n\u003cp\u003eA pair of pistons with all rings, wrist pins, and wrist pin locks ready to install.\u003c\/p\u003e\n\u003ch3\u003eCan I use these in a 124\" or larger stroker?\u003c\/h3\u003e\n\u003cp\u003eNo — this part is sized for 114-120 cu in M8 builds. Larger displacement requires a different bore or part number.\u003c\/p\u003e\n\u003ch3\u003eDo these require a hone or break-in procedure?\u003c\/h3\u003e\n\u003cp\u003eYes. The Line2Line abradable skirt coating seats during initial break-in for a tight, quiet running fit. Follow standard piston break-in procedure.\u003c\/p\u003e\n\u003ch3\u003eWill these work with 1mm oversize valves?\u003c\/h3\u003e\n\u003cp\u003eYes — the valve pockets are sized specifically to accommodate 1mm oversize valves without interference.\u003c\/p\u003e\n\u003ch3\u003eIs forced wrist pin oiling necessary?\u003c\/h3\u003e\n\u003cp\u003eThis piston is designed with forced oiling provision. Ensure your engine block or connecting rods support oil galleries to the wrist pin boss.\u003c\/p\u003e","brand":"Kb Pistons","offers":[{"title":"Default Title","offer_id":53035878514799,"sku":"824-01800","price":449.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_00945ad4-3f2f-48f4-9bb0-3bb7954d3f6e.png?v=1779563691","url":"https:\/\/vtwinbikers.com\/products\/kb-pistons-super-duty-piston-4-125-bore-m8-114-117-to-120-std-824-01800","provider":"Vtwinbikers","version":"1.0","type":"link"}