{"product_id":"pulse-adrenaline-superbyke-rmr125-k157fmi-57mm-cylinder-kit","title":"Pulse Adrenaline \/ Superbyke RMR125 K157FMI 57mm Cylinder Kit","description":"\u003ch2\u003ePulse Adrenaline \/ Superbyke RMR125 K157FMI 57mm Cylinder Kit\u003c\/h2\u003e\u003cp\u003eBrand-new unbranded standard 57 mm top-end kit for selected Pulse Adrenaline 125 and Superbyke RMR125 motorcycles using the K157FMI engine family.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEngine family: K157FMI \/ 157FMI GS-style\u003c\/li\u003e\n\u003cli\u003eDisplacement: Standard 125cc application\u003c\/li\u003e\n\u003cli\u003eStandard bore: 57 mm\u003c\/li\u003e\n\u003cli\u003eEngine stroke reference: 48.8 mm\u003c\/li\u003e\n\u003cli\u003ePiston-pin reference: 14 mm\u003c\/li\u003e\n\u003cli\u003eCooling: Air-cooled\u003c\/li\u003e\n\u003cli\u003eEngine type: Single-cylinder 4-stroke\u003c\/li\u003e\n\u003cli\u003eCylinder style: EGR \/ secondary-air-system type\u003c\/li\u003e\n\u003cli\u003eCondition: Brand new\u003c\/li\u003e\n\u003cli\u003eType: Unbranded aftermarket replacement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x cylinder barrel\u003c\/li\u003e\n\u003cli\u003e1 x piston\u003c\/li\u003e\n\u003cli\u003e1 x piston ring set\u003c\/li\u003e\n\u003cli\u003eHead and base gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eVehicle \/ Engine Compatibility\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel \/ Engine\u003c\/th\u003e\n\u003cth\u003eYears \/ Scope\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePulse\u003c\/td\u003e\n\u003ctd\u003eAdrenaline 125 XF125GY-2B\u003c\/td\u003e\n\u003ctd\u003eK157FMI application\u003c\/td\u003e\n\u003ctd\u003eMatch original 57 mm EGR-style cylinder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuperbyke\u003c\/td\u003e\n\u003ctd\u003eRMR125\u003c\/td\u003e\n\u003ctd\u003eK157FMI application\u003c\/td\u003e\n\u003ctd\u003eMatch original 57 mm EGR-style cylinder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eImportant Fitment Information\u003c\/h3\u003e\u003cp\u003eUse the engine code and physical cylinder configuration as the primary fitment check. Modified engines or replacement engines may use different top-end parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo not order by 125cc capacity alone.\u003c\/strong\u003e Before purchase, compare the original engine code, 57 mm bore, piston-pin diameter, piston crown\/profile, cylinder height, stud spacing, gasket profile, oil passages and EGR\/secondary-air ports with the existing engine.\u003c\/p\u003e\u003cp\u003eThe K157FMI family was used across carburetted and fuel-injected motorcycles, and production changes can affect top-end components. This kit should only be used where the original parts match the standard 57 mm K157FMI EGR-style configuration.\u003c\/p\u003e\u003ch3\u003eInstallation\u003c\/h3\u003e\u003cp\u003eCorrect piston-ring orientation, piston direction, valve timing, gasket installation and cylinder-head torque are essential. Professional installation is recommended where the correct engine-building procedure is not known.\u003c\/p\u003e","brand":"Unbranded","offers":[{"title":"Default Title","offer_id":57504410993015,"sku":"01242-ENG","price":44.0,"currency_code":"SHP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0528\/8771\/6007\/files\/20260929_113018.jpg?v=1790772653","url":"https:\/\/www.motomaniauk.com\/products\/pulse-adrenaline-superbyke-rmr125-k157fmi-57mm-cylinder-kit","provider":"Moto Mania UK","version":"1.0","type":"link"}