{"product_id":"kb-pistons-super-duty-piston-4-250-bore-m8-107-to-124-std-11-4-1-824-01830","title":"Kb Pistons Super Duty Piston - 4.250\" Bore M8 107 TO 124\" STD 11.4:1 — Harley-Davidson (2017-2025)","description":"\u003cp\u003eKB Pistons Super Duty piston set for Harley Milwaukee-Eight engines, sized to 4.250\" bore with flat-top design and 11.4:1 compression ratio. Built for durability with anodized crown, abradable skirt coating, and premium ring package for tight running clearance and reliability.\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 and quiet operation\u003c\/li\u003e\n  \u003cli\u003eRound wire locks\u003c\/li\u003e\n  \u003cli\u003ePremium Hastings 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 design with 1.2cc displacement and 1.083\" compression height\u003c\/li\u003e\n  \u003cli\u003eAccommodates 1mm oversize valves\u003c\/li\u003e\n  \u003cli\u003eRings, wrist pins, and locks included\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 KB576LCA.STD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 800745266941\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 4.250\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression Ratio:\u003c\/strong\u003e 11.4:1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 1.2cc\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression Height:\u003c\/strong\u003e 1.083\"\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  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e Pair\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits Harley-Davidson Milwaukee-Eight (M8) engines 107 to 124 cubic inches. Standard size for stock bore.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat's included in this piston kit?\u003c\/h3\u003e\n\u003cp\u003eA pair of pistons, premium ring set, wrist pins, and round wire locks — everything needed for installation.\u003c\/p\u003e\n\u003ch3\u003eCan I use these with stock-size cylinders?\u003c\/h3\u003e\n\u003cp\u003eYes — this is standard size for stock M8 bore. Oversized pistons require matching cylinder boring.\u003c\/p\u003e\n\u003ch3\u003eWhat does the Line2Line Abradable coating do?\u003c\/h3\u003e\n\u003cp\u003eThe .003\" skirt coating provides zero initial clearance and hones in during break-in for a tight, quiet running fit.\u003c\/p\u003e\n\u003ch3\u003eWill these pistons fit 107cc and 124cc engines?\u003c\/h3\u003e\n\u003cp\u003eYes — these standard-bore pistons work across the M8 displacement range from 107 to 124 cubic inches.\u003c\/p\u003e","brand":"Kb Pistons","offers":[{"title":"Default Title","offer_id":53035952734319,"sku":"824-01830","price":465.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_d4058087-253f-4b4b-80da-17d969c1c092.png?v=1779564140","url":"https:\/\/vtwinbikers.com\/products\/kb-pistons-super-duty-piston-4-250-bore-m8-107-to-124-std-11-4-1-824-01830","provider":"Vtwinbikers","version":"1.0","type":"link"}