{"product_id":"kb-pistons-super-duty-piston-4-125-bore-m8-114-117-to-120-020-824-01802","title":"Kb Pistons Super Duty Piston - 4.125\" Bore M8 114\/117 TO 120\" +.020 — Harley-Davidson (2017-2020)","description":"\u003cp\u003eKB Pistons Super Duty pistons for Milwaukee-Eight (M8) engines from 114 to 120 cubic inches, designed for stock and mildly modified builds. Each pair includes rings, wrist pins, and locks for a complete piston assembly ready to install.\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 for zero initial clearance that self-hones for tight, quiet operation\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 design with 1.2cc dish and 1.083\" compression height\u003c\/li\u003e\n  \u003cli\u003eAccommodates 1mm oversize valves\u003c\/li\u003e\n  \u003cli\u003eSold as a pair with all rings and hardware 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 KB542LCA.020\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e 4.125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEngine:\u003c\/strong\u003e Milwaukee-Eight (M8)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisplacement Range:\u003c\/strong\u003e 114 to 120 cubic inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOversize:\u003c\/strong\u003e +.020 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression Height:\u003c\/strong\u003e 1.083 inches\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 per pair\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 Milwaukee-Eight (M8) V-twin engines in the 114 to 120 cubic inch displacement range with a 4.125-inch 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\u003eEach pair includes two pistons, Hastings steel-nitride top rings, Napier second rings, wrist pins, and round wire locks — everything needed for installation.\u003c\/p\u003e\n\u003ch3\u003eWill these pistons work with my 110-inch M8?\u003c\/h3\u003e\n\u003cp\u003eThese are designed for 114 to 120-inch M8 engines. A 110-inch engine requires a different bore size and piston part number.\u003c\/p\u003e\n\u003ch3\u003eWhat does the Line2Line Abradable coating do?\u003c\/h3\u003e\n\u003cp\u003eThe coating allows zero initial clearance, then self-hones as the engine runs to achieve a tight, quiet running fit without loose piston slap.\u003c\/p\u003e\n\u003ch3\u003eCan I use these in a stock 114-inch M8?\u003c\/h3\u003e\n\u003cp\u003eYes. These pistons work in stock displacement and mildly modified 114 to 120-inch M8 builds. For heavily modified engines, consult KB Pistons about compression ratio and boost compatibility.\u003c\/p\u003e\n\u003ch3\u003eDo these accommodate larger valves?\u003c\/h3\u003e\n\u003cp\u003eYes — the pockets are sized for 1mm oversize valves if your cylinder head has been ported or upgraded.\u003c\/p\u003e","brand":"Kb Pistons","offers":[{"title":"Default Title","offer_id":53035878613103,"sku":"824-01802","price":449.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_e308fd41-a343-4621-9017-d4622d854bdd.png?v=1779563327","url":"https:\/\/vtwinbikers.com\/products\/kb-pistons-super-duty-piston-4-125-bore-m8-114-117-to-120-020-824-01802","provider":"Vtwinbikers","version":"1.0","type":"link"}