{"product_id":"kb-pistons-super-duty-piston-4-250-bore-m8-107-to-124-005-11-4-1-824-01831","title":"Kb Pistons Super Duty Piston - 4.250\" Bore M8 107 TO 124\" +.005 11.4:1 — Harley-Davidson (2017-2021)","description":"\u003cp\u003eKB Pistons Super Duty piston set for M8 Harley-Davidson and Indian Motorcycle big-twin engines, sized for 4.250\" bore and 107–124\" displacement builds. Sold as a matched pair with premium rings, wrist pins, and locks included.\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) for zero initial clearance and tight, quiet running\u003c\/li\u003e\n  \u003cli\u003eRound wire wrist pin locks\u003c\/li\u003e\n  \u003cli\u003ePremium Hastels 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 dome with 1.2cc bowl 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 and pins 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.005\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 800745266958\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e M8 engines 107–124 cubic inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e 4.250 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 Design:\u003c\/strong\u003e Flat top, 1.2cc bowl\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e Pair (2 pistons)\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 and Indian Motorcycle V-twin big-twin engines with M8 architecture, 4.250\" bore displacement. Suitable for 107–124 cubic-inch builds.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat's included in the box?\u003c\/h3\u003e\n\u003cp\u003ePair of pistons, premium top and second rings, wrist pins, and round wire locks — everything needed to complete a piston installation.\u003c\/p\u003e\n\u003ch3\u003eWhat does Line2Line Abradable skirt coating do?\u003c\/h3\u003e\n\u003cp\u003eThe .003\" coating provides zero initial clearance and self-hones during break-in to achieve a tight, quiet fit that reduces piston noise.\u003c\/p\u003e\n\u003ch3\u003eWill these pistons fit my 110\" or 117\" build?\u003c\/h3\u003e\n\u003cp\u003eYes — KB designed these for 107–124 cubic-inch M8 stroker applications with a 4.250\" bore.\u003c\/p\u003e\n\u003ch3\u003eCan I use these pistons with 1mm oversize valves?\u003c\/h3\u003e\n\u003cp\u003eYes — the valve pockets are specifically sized to accommodate 1mm oversize valves without interference.\u003c\/p\u003e\n\u003ch3\u003eAre these pistons sold as singles or pairs?\u003c\/h3\u003e\n\u003cp\u003eSold as a matched pair only. You receive two pistons, ready for a complete V-twin engine rebuild.\u003c\/p\u003e","brand":"Kb Pistons","offers":[{"title":"Default Title","offer_id":53035952799855,"sku":"824-01831","price":465.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_84773e33-8b5d-4839-808a-f243c7847b3d.png?v=1779563808","url":"https:\/\/vtwinbikers.com\/products\/kb-pistons-super-duty-piston-4-250-bore-m8-107-to-124-005-11-4-1-824-01831","provider":"Vtwinbikers","version":"1.0","type":"link"}