{"product_id":"kb-pistons-super-duty-piston-4-250-bore-m8-107-to-124-005-11-8-1-824-01833","title":"Kb Pistons Super Duty Piston - 4.250\" Bore M8 107 TO 124\" +.005 11.8:1 — Harley-Davidson (2017-2021)","description":"\u003cp\u003eKB Pistons Super Duty pistons for Harley Milwaukee-Eight 107 to 124 cubic inch engines, sold as a pair with rings and wrist pins included. Built with anodized crown, Line2Line abradable skirt coating, and premium Hastings steel nitride rings for durability 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 tight, quiet running clearance\u003c\/li\u003e\n  \u003cli\u003eRound wire wrist pin locks\u003c\/li\u003e\n  \u003cli\u003ePremium Hastings 1.2mm 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 dish and 1.083\" compression height\u003c\/li\u003e\n  \u003cli\u003eValve pockets sized for 1mm oversize valves\u003c\/li\u003e\n  \u003cli\u003eSold as a pair with all rings, 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 KB595LCA.005\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 800745276162\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 4.250 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEngine Size:\u003c\/strong\u003e M8 107–124 cubic inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression Ratio:\u003c\/strong\u003e 11.8:1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression Height:\u003c\/strong\u003e 1.083 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTop Ring Groove:\u003c\/strong\u003e Anodized\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 (2 pistons)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits Harley-Davidson Milwaukee-Eight (M8) engines from 107 to 124 cubic inches with +.005 overbore.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat's included with these pistons?\u003c\/h3\u003e\n\u003cp\u003eThe pair of pistons, Hastings steel nitride top and ductile second rings, wrist pins, and round wire locks — everything needed for installation.\u003c\/p\u003e\n\u003ch3\u003eDo these require a machine shop for installation?\u003c\/h3\u003e\n\u003cp\u003eYes — piston installation requires professional engine work, cylinder boring, and honing to proper clearance. Do not attempt this as a DIY job.\u003c\/p\u003e\n\u003ch3\u003eWill these fit a 117 or 124cc stroker kit?\u003c\/h3\u003e\n\u003cp\u003eThese are sized for 4.250\" bore. Verify with KB Pistons or your engine builder that this bore matches your specific stroker package.\u003c\/p\u003e\n\u003ch3\u003eWhat's the Line2Line abradable skirt coating?\u003c\/h3\u003e\n\u003cp\u003eA thin (.003\") polymer coating that provides zero initial clearance and self-hones to the cylinder for a tight fit and reduced piston noise during break-in.\u003c\/p\u003e\n\u003ch3\u003eCan I use different rings than the Hastings premium set?\u003c\/h3\u003e\n\u003cp\u003eThese pistons are designed around the included Hastings ring dimensions. Mixing ring brands or sizes can affect blow-by and clearance — stick with the included set or consult KB Pistons before swapping.\u003c\/p\u003e","brand":"Kb Pistons","offers":[{"title":"Default Title","offer_id":53035952865391,"sku":"824-01833","price":465.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_784836fe-4028-482c-8588-cb117bd12339.png?v=1779563958","url":"https:\/\/vtwinbikers.com\/products\/kb-pistons-super-duty-piston-4-250-bore-m8-107-to-124-005-11-8-1-824-01833","provider":"Vtwinbikers","version":"1.0","type":"link"}