{"product_id":"kb-pistons-super-duty-piston-4-125-bore-m8-114-117-to-120-010-824-01801","title":"Kb Pistons Super Duty Piston - 4.125\" Bore M8 114\/117 TO 120\" +.010 — Harley-Davidson (2017-2020)","description":"\u003cp\u003eKB Pistons Super Duty piston set for Milwaukee-Eight engines with 4.125\" bore, designed for 114cc to 120cc displacement builds up to +.010\" overbore. Each pair features anodized grooves, Line2Line abradable skirt coating, and premium Hastels ring package for tight, quiet running clearance.\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\" total thickness) for zero initial fit\u003c\/li\u003e\n  \u003cli\u003eRound wire wrist pin locks\u003c\/li\u003e\n  \u003cli\u003ePremium Hastings 1.2mm top ring with Steel Nitride, 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, 1.083\" compression height\u003c\/li\u003e\n  \u003cli\u003eRings, 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 KB542LCA.010\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e 4.125\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverbore:\u003c\/strong\u003e +.010\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEngine Size:\u003c\/strong\u003e 114cc to 120cc M8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression Height:\u003c\/strong\u003e 1.083\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDish Volume:\u003c\/strong\u003e 1.2cc flat-top\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 in the 114cc to 120cc displacement range with 4.125\" bore and +.010\" overbore.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat's included with this piston set?\u003c\/h3\u003e\n\u003cp\u003eA pair of pistons plus all rings (top and second), wrist pins, and wire locks — everything needed for installation.\u003c\/p\u003e\n\u003ch3\u003eWhat engine sizes do these fit?\u003c\/h3\u003e\n\u003cp\u003e114cc to 120cc Milwaukee-Eight builds on 4.125\" bore with +.010\" overbore.\u003c\/p\u003e\n\u003ch3\u003eWhy does the skirt coating say 'zero initial fit'?\u003c\/h3\u003e\n\u003cp\u003eLine2Line abradable coating is applied at .003\" total thickness and hones itself during initial break-in, creating a tight, quiet running clearance over time rather than out-of-the-box.\u003c\/p\u003e\n\u003ch3\u003eCan I use 1mm oversize valves with these pistons?\u003c\/h3\u003e\n\u003cp\u003eYes — the valve pockets are sized to accommodate 1mm oversize valves without interference.\u003c\/p\u003e\n\u003ch3\u003eDo these pistons require a tuner or other modifications?\u003c\/h3\u003e\n\u003cp\u003ePiston selection depends on your entire build spec. Consult your engine builder or KB Pistons tech support to confirm this set matches your compression ratio and displacement targets.\u003c\/p\u003e","brand":"Kb Pistons","offers":[{"title":"Default Title","offer_id":53035878547567,"sku":"824-01801","price":449.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_22937460-0b75-45bc-94b4-16d71da1c2b3.png?v=1779564135","url":"https:\/\/vtwinbikers.com\/products\/kb-pistons-super-duty-piston-4-125-bore-m8-114-117-to-120-010-824-01801","provider":"Vtwinbikers","version":"1.0","type":"link"}