{"product_id":"rocket-performance-garage-llc-big-bore-cylinder-kits-kit-128-m8-2017-2024-e-276-02060","title":"Rocket Performance Garage Llc Big Bore Cylinder Kits - KIT 128\" M8 2017-2024 (e… — Harley-Davidson (2017-2024)","description":"\u003cp\u003eRocket Performance Garage 128cc big bore cylinder kit for 2017-2024 Harley Milwaukee-Eight engines, displacing the M8 from 107cc to 128cc. Includes USA-made cylinders and Wiseco forged pistons matched for reliable power gains and street rideability.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eIncreases M8 displacement to 128cc\u003c\/li\u003e\n  \u003cli\u003e10.5:1 compression ratio\u003c\/li\u003e\n  \u003cli\u003eWiseco forged pistons included\u003c\/li\u003e\n  \u003cli\u003eUSA-manufactured cylinders\u003c\/li\u003e\n  \u003cli\u003eBlack powder-coated finish with machined fins\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 Rocket Performance Garage\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 8-8102\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisplacement Increase:\u003c\/strong\u003e 107cc to 128cc\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression Ratio:\u003c\/strong\u003e 10.5:1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePiston Type:\u003c\/strong\u003e Wiseco forged\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 9 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 8 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 20 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 25 lbs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits 2017-2024 Harley-Davidson Milwaukee-Eight (M8) engines.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat displacement does this kit bring my M8 to?\u003c\/h3\u003e\n\u003cp\u003eThis kit displaces your 2017-2024 Milwaukee-Eight from 107cc to 128cc total.\u003c\/p\u003e\n\u003ch3\u003eIs professional installation required?\u003c\/h3\u003e\n\u003cp\u003eYes — big bore cylinder installation requires engine disassembly and precise machine work. Have a qualified Harley technician or performance shop handle this job.\u003c\/p\u003e\n\u003ch3\u003eWill I need to tune my bike after installation?\u003c\/h3\u003e\n\u003cp\u003eYes — a fuel and ignition tune via ECM flash or aftermarket tuner is strongly recommended to optimize the extra displacement and compression.\u003c\/p\u003e\n\u003ch3\u003eAre these cylinders street-legal?\u003c\/h3\u003e\n\u003cp\u003eThese are performance parts. Check your local emissions regulations before installation — some jurisdictions may require emissions testing.\u003c\/p\u003e\n\u003ch3\u003eWhat's included in the kit?\u003c\/h3\u003e\n\u003cp\u003eThe kit includes the big bore cylinders and Wiseco forged pistons. Head gaskets, base gaskets, and other sealing components are typically sold separately.\u003c\/p\u003e","brand":"Rocket Performance Garage Llc","offers":[{"title":"Default Title","offer_id":53035940905071,"sku":"276-02060","price":1599.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_eb6f5ba3-b041-48f0-9f77-27e76965e8bf.png?v=1779563853","url":"https:\/\/vtwinbikers.com\/products\/rocket-performance-garage-llc-big-bore-cylinder-kits-kit-128-m8-2017-2024-e-276-02060","provider":"Vtwinbikers","version":"1.0","type":"link"}