{"product_id":"156fmi-cg125-style-150cc-big-bore-cylinder-piston-kit-62mm-15mm","title":"Honda CG125 Style 156FMI 125 to 150cc Big Bore Kit 62mm 15mm Pin","description":"\u003ch2\u003eHonda CG125 Style 156FMI 125cc to 150cc 62mm Big-Bore Kit\u003c\/h2\u003e\n\u003cp\u003eAftermarket big-bore cylinder and piston kit for selected \u003cstrong\u003eHonda CG125-style\u003c\/strong\u003e Chinese 125cc OHV \/ pushrod engines using the \u003cstrong\u003e156FMI \/ 1P56FMI\u003c\/strong\u003e engine platform. This kit increases the bore to 62 mm and, with the common 49.5 mm stroke, gives approximately 149cc.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specification\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eApplication type: \u003cstrong\u003eHonda CG125-style Chinese 156FMI OHV \/ pushrod engine\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEngine family: \u003cstrong\u003e156FMI \/ 1P56FMI\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCooling: Air cooled\u003c\/li\u003e\n\u003cli\u003eBore: \u003cstrong\u003e62.00 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eTypical compatible stroke: \u003cstrong\u003e49.50 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eApproximate capacity after conversion: \u003cstrong\u003e149.4cc\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePiston \/ gudgeon pin diameter: \u003cstrong\u003e15 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eTypical cylinder height: approximately \u003cstrong\u003e68 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eApproximate cylinder sleeve \/ spigot diameter requiring crankcase clearance: \u003cstrong\u003e68 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCondition: Brand new aftermarket big-bore conversion kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Crankcase Machining Requirement\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eThe engine casing \/ crankcase will need to be bored out to accommodate the larger cylinder sleeve.\u003c\/strong\u003e The 62 mm big-bore cylinder uses a larger lower sleeve \/ spigot than the standard 125cc barrel, so the crankcase mouth must be machined to provide sufficient clearance before the cylinder can be installed correctly.\u003c\/p\u003e\n\u003cp\u003eThis is not normally a simple bolt-on conversion. The crankcases should be stripped and professionally machined so the sleeve fits concentrically without excessive clearance or interference.\u003c\/p\u003e\n\n\u003ch3\u003eCommon Aftermarket Reference\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM587-A095\u003c\/strong\u003e – common aftermarket reference for this 62 mm \/ 15 mm CG-style big-bore kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Kit Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e62 mm cylinder \/ barrel\u003c\/li\u003e\n\u003cli\u003e62 mm piston\u003c\/li\u003e\n\u003cli\u003ePiston ring set\u003c\/li\u003e\n\u003cli\u003e15 mm piston \/ wrist pin\u003c\/li\u003e\n\u003cli\u003e2 x piston-pin circlips\u003c\/li\u003e\n\u003cli\u003eCylinder base gasket\u003c\/li\u003e\n\u003cli\u003eCylinder-head gasket\u003c\/li\u003e\n\u003cli\u003eValve-stem seals on many kits of this specification\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUse the product photographs as the final guide to the exact components supplied.\u003c\/p\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSelected Chinese \u003cstrong\u003e156FMI \/ 1P56FMI\u003c\/strong\u003e 125cc engines\u003c\/li\u003e\n\u003cli\u003eHonda CG125-style OHV \/ pushrod engine designs\u003c\/li\u003e\n\u003cli\u003eChinese CG \/ GY 125cc motorcycles using a 15 mm piston pin\u003c\/li\u003e\n\u003cli\u003e125cc-to-150cc big-bore conversions where the engine casing is machined for the larger sleeve\u003c\/li\u003e\n\u003cli\u003eSelected motorcycle \/ ATV applications using the same CG-style engine architecture\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Honda CG125 Fitment Note\u003c\/h3\u003e\n\u003cp\u003eThis product is intended for \u003cstrong\u003eHonda CG125-style Chinese engines\u003c\/strong\u003e. It is commonly described in the aftermarket as a Honda CG125 \/ CG150-style big-bore kit, but it should \u003cstrong\u003enot\u003c\/strong\u003e be assumed to be a direct bolt-on replacement for every genuine Honda-manufactured CG125 engine.\u003c\/p\u003e\n\u003cp\u003eBefore ordering, confirm the engine is the correct 156FMI-style OHV \/ pushrod design, uses a 15 mm piston pin and has a compatible stud pattern, cylinder head and oil-way arrangement.\u003c\/p\u003e\n\n\u003ch3\u003eCritical Fitment Checks\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm the engine is a CG-style \u003cstrong\u003eOHV \/ pushrod\u003c\/strong\u003e design.\u003c\/li\u003e\n\u003cli\u003eConfirm a \u003cstrong\u003e15 mm piston pin\u003c\/strong\u003e is used.\u003c\/li\u003e\n\u003cli\u003eConfirm cylinder stud spacing and oil-way position.\u003c\/li\u003e\n\u003cli\u003eCompare the cylinder head and gasket pattern.\u003c\/li\u003e\n\u003cli\u003eConfirm the crankcase can be safely machined to accept the approximately 68 mm sleeve \/ spigot.\u003c\/li\u003e\n\u003cli\u003eDo not fit to incompatible OHC engines or dual-port cylinder-head designs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eProfessional engine machining and assembly are strongly recommended. The crankcases must be bored accurately for the larger cylinder sleeve before installation. Check piston-to-cylinder clearance, ring end gap, piston orientation, gasket alignment, valve clearance and oil passages during assembly.\u003c\/p\u003e\n\u003cp\u003eAfter assembly, rotate the engine by hand before starting and use an appropriate running-in procedure. Carburettor jetting \/ fuelling may also require adjustment to suit the increased engine capacity.\u003c\/p\u003e\n\n\u003ch3\u003eShipping Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePacked shipping weight: approximately \u003cstrong\u003e2.2 kg\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEstimated packed dimensions: \u003cstrong\u003e22 x 22 x 17 cm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Unbranded","offers":[{"title":"Default Title","offer_id":57739163894135,"sku":"00922-ENG","price":46.0,"currency_code":"SHP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0528\/8771\/6007\/files\/20261024_150657.jpg?v=1794303791","url":"https:\/\/www.motomaniauk.com\/products\/156fmi-cg125-style-150cc-big-bore-cylinder-piston-kit-62mm-15mm","provider":"Moto Mania UK","version":"1.0","type":"link"}