{"product_id":"cp-carrillo-m8-139-pistons","title":"Forged Piston Kit — Milwaukee-Eight 139","description":"\u003cp\u003eCP-Carrillo forged piston kit for Milwaukee-Eight 139 Harley-Davidson engines — the same pistons serious engine builders spec for high-output baggers. Forged in the USA from high-strength 2618 aluminum alloy for strength under boost, nitrous and high compression.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eRace \/ competition use:\u003c\/strong\u003e this is an engine performance component. It is not legal for use or installation on pollution-controlled vehicles operated on public highways in California, and it cannot be shipped to California.\u003c\/p\u003e\u003ch3\u003eFITMENT\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEngine: Milwaukee-Eight\u003c\/li\u003e\n\u003cli\u003eApplication years (CP-Carrillo data): 2017–2022\u003c\/li\u003e\n\u003cli\u003eBig-bore \/ performance application — requires matching cylinders and machine work (see Installation).\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot sure it fits your bike? Email info@norcalbaggersupply.com — email is the fastest way to reach us — and we'll confirm before you order. You can also call 916-626-9030 (Mon–Fri, 9 AM–5 PM PT).\u003c\/p\u003e\u003ch3\u003eSPECIFICATIONS\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM5140\u003c\/strong\u003e — Bore 4.5 in, stroke 4.375 in, 11.0:1 compression, dome -14.9 cc, compression height 1.143 in, wrist pin 927-2500-18CP1C, ring set 1-MG10-4505\n2-MS20-4505-THG\n3-D30-4500-0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM5141\u003c\/strong\u003e — Bore 4.5 in, stroke 4.375 in, 11.5:1 compression, dome -9.6 cc, compression height 1.143 in, wrist pin 927-2500-18CP1C, ring set 1-MG10-4505\n2-MS20-4505-THG\n3-D30-4500-0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM5142\u003c\/strong\u003e — Bore 4.5 in, stroke 4.375 in, 12.0:1 compression, dome -4.6 cc, compression height 1.143 in, wrist pin 927-2500-18CP1C, ring set 1-MG10-4505\n2-MS20-4505-THG\n3-D30-4500-0\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eKit includes two pistons, ring sets, wrist pins and clips. Made in the USA by CP-Carrillo.\u003c\/p\u003e\u003ch3\u003eINSTALLATION\u003c\/h3\u003e\u003cp\u003eProfessional installation by a qualified engine builder or machine shop is required. Cylinders must be bored and honed to the finished piston size, and ring end gaps, piston-to-wall clearance and deck height set to CP-Carrillo's specifications for your build. Pistons only — cylinders and gaskets are not included.\u003c\/p\u003e\u003ch3\u003eQUESTIONS RIDERS ASK\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color:#d4af37\"\u003eIs this a complete kit?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#ffffff\"\u003eYes — each set covers both cylinders: two pistons, ring sets, wrist pins and clips.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color:#d4af37\"\u003eDoes it fit my 2023.5+ Milwaukee-Eight?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#ffffff\"\u003eCP-Carrillo's application data for these part numbers covers 2017–2022 Milwaukee-Eight engines. If your bike is a 2023.5 or newer Gen 2 model, email us first and we'll confirm the right part number with CP-Carrillo before you order.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color:#d4af37\"\u003eCan I order a single replacement piston?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#ffffff\"\u003eSingles exist in CP-Carrillo's line for service work. Email us the part number off your piston and we'll price a single through our dealer account.\u003c\/span\u003e\u003c\/p\u003e","brand":"CP-Carrillo","offers":[{"title":"4.5\" bore · 11.0:1 · M5140","offer_id":67941422137446,"sku":"M5140-SET","price":650.0,"currency_code":"USD","in_stock":true},{"title":"4.5\" bore · 11.5:1 · M5141","offer_id":67941422170214,"sku":"M5141-SET","price":650.0,"currency_code":"USD","in_stock":true},{"title":"4.5\" bore · 12.0:1 · M5142","offer_id":67941422202982,"sku":"M5142-SET","price":650.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/6133\/0022\/files\/lp-piston-prod_175aa50c-30ab-43d1-bf41-01bc9528f632.png?v=1793985334","url":"https:\/\/norcalbaggersupply.com\/products\/cp-carrillo-m8-139-pistons","provider":"NorCal Bagger Supply","version":"1.0","type":"link"}