{"product_id":"kb-pistons-super-duty-piston-4-250-bore-m8-107-to-124-std-11-8-1-824-01832","title":"Kb Pistons Super Duty Piston - 4.250\" Bore M8 107 TO 124\" STD 11.8:1 — Harley-Davidson (2017-2025)","description":"\u003cp\u003eKB Pistons Super Duty piston for Milwaukee-Eight (M8) engines, sold as a pair with all rings, wrist pins, and locks included. Built for 4.250\" bore with 11.8:1 compression ratio and flat-top design to accommodate 1mm oversize valves.\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 1.2mm top ring with Steel Nitride coating and 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\u003eAll rings, wrist pins, and locks included\u003c\/li\u003e\n  \u003cli\u003eSold as a pair\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.STD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 800745276155\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEngine:\u003c\/strong\u003e Milwaukee-Eight (M8)\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 11.8:1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression Height:\u003c\/strong\u003e 1.083\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePiston Dish:\u003c\/strong\u003e 1.2cc flat-top\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.5 lbs per pair\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 with 4.250\" 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 Hastings rings, stainless steel wrist pins, and round wire locks — everything needed for a complete piston swap.\u003c\/p\u003e\n\u003ch3\u003eWill these pistons work with 1mm oversize valves?\u003c\/h3\u003e\n\u003cp\u003eYes — the flat-top design and valve pockets are sized specifically to accommodate 1mm oversize valves without interference.\u003c\/p\u003e\n\u003ch3\u003eWhat does Line2Line Abradable skirt coating do?\u003c\/h3\u003e\n\u003cp\u003eThe .003\" coating allows the piston to start with zero initial clearance, then hones in as you ride for a tight, quiet-running fit without excessive bearing wear.\u003c\/p\u003e\n\u003ch3\u003eDo I need to hone my cylinders before installing these?\u003c\/h3\u003e\n\u003cp\u003eYour engine builder can assess your cylinder condition. The Abradable coating is designed to work with proper honing practices.\u003c\/p\u003e\n\u003ch3\u003eWhat compression ratio do these give?\u003c\/h3\u003e\n\u003cp\u003eThese are 11.8:1 pistons for your bore size — verify with your engine builder that this matches your build target and fuel requirements.\u003c\/p\u003e","brand":"Kb Pistons","offers":[{"title":"Default Title","offer_id":53035952832623,"sku":"824-01832","price":465.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_7d66559a-aa55-40f2-86dc-546430945e35.png?v=1779563895","url":"https:\/\/vtwinbikers.com\/products\/kb-pistons-super-duty-piston-4-250-bore-m8-107-to-124-std-11-8-1-824-01832","provider":"Vtwinbikers","version":"1.0","type":"link"}