{"product_id":"gn125-bd125-125cc-4-speed-gearbox-assembly-manual-clutch-pit-bike-engine","title":"GN125 BD125 125cc 4-Speed Gearbox Assembly – Manual Clutch Pit Bike Engine","description":"\u003ch3\u003e\u003cspan\u003eGN125 \/ BD125 4-Speed Gearbox Assembly\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eBrand new replacement \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e4-speed gearbox assembly\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e suitable for selected \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGN125 \/ BD125-style 125cc manual clutch engines\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, commonly used in pit bikes and similar applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe gearbox is supplied as a complete \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003etwo-shaft gear assembly\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, including the input and output shafts with gears installed.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIdeal for replacing a worn, damaged or faulty gearbox.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eBrand new replacement gearbox\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eSuitable for selected \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGN125 and BD125 manual clutch engines\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e4-speed gearbox\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eComplete input and output shaft assemblies\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSupplied with gears fitted\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for many 125cc pit bike engine applications\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUK stock\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFast UK dispatch\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cspan\u003eOutput Shaft\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eOverall shaft length: \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e119.5mm\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eOutput section diameter: \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e17mm\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eBearing end diameter: \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12mm\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eGear tooth counts:\u003c\/span\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e23 teeth\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e20 teeth\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e16 teeth\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e11 teeth\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eInput Shaft\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eOverall shaft length: \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e116.5mm\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eSpline diameter: \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e17mm\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eBearing section diameter: \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12mm\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eGear tooth counts:\u003c\/span\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e36 teeth\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e31 teeth\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e27 teeth\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e24 teeth\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003ePackage Includes\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003e1 x Complete 4-Speed Gearbox Assembly\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIncludes both input and output gear shafts as pictured.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eCompatibility\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eDesigned for selected \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGN125 \/ BD125-style 125cc manual clutch engines\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThere are several variations of Chinese pit bike engines and gearboxes, so \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eplease compare the shaft dimensions, spline sizes and gear tooth counts with your original gearbox before ordering\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eDo not rely on engine capacity alone when checking compatibility.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIf you are unsure whether this part will fit your engine, please contact us before ordering.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eUK Stock \u0026amp; Delivery\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eStocked and dispatched from the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eUK\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFast UK delivery available.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e","brand":"Moto Mania UK","offers":[{"title":"Default Title","offer_id":57393235493239,"sku":"02289-ENG","price":36.0,"currency_code":"SHP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0528\/8771\/6007\/files\/20260806_122457.png?v=1787125681","url":"https:\/\/www.motomaniauk.com\/products\/gn125-bd125-125cc-4-speed-gearbox-assembly-manual-clutch-pit-bike-engine","provider":"Moto Mania UK","version":"1.0","type":"link"}