{"product_id":"yx140-pit-bike-4-speed-gearbox-input-output-shaft-gear-set","title":"YX140 Pit Bike 4-Speed Gearbox Input Output Shaft Gear Set","description":"\u003ch2\u003eYX140 Pit Bike 4-Speed Gearbox – Complete Gear Set\u003c\/h2\u003e\u003cp\u003eComplete aftermarket transmission gear set supplied with the primary\/input and secondary\/output shaft gear assemblies. Designed for compatible YX horizontal pit-bike engines using this specific 4-speed gearbox configuration.\u003c\/p\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eYX140 fitment:\u003c\/strong\u003e Fits compatible late-generation YX140 horizontal pit-bike engines using the matching 4-speed gearbox. This gearbox is commonly associated with later Gen 2 \/ Gen 3 YX140 engines. YX140 engines were produced with more than one gearbox version, so the engine capacity alone is not enough to confirm fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCritical fitment check:\u003c\/strong\u003e remove and measure the original gearbox before ordering. The replacement must match all of the following measurements:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePrimary \/ smaller-gear shaft: 153.5 mm overall length\u003c\/li\u003e\n\u003cli\u003ePrimary shaft spline outside diameter: 17 mm\u003c\/li\u003e\n\u003cli\u003ePrimary shaft bearing-end diameter: 12 mm\u003c\/li\u003e\n\u003cli\u003eSecondary \/ larger-gear shaft: 134.25 mm overall length\u003c\/li\u003e\n\u003cli\u003eSecondary shaft spline outside diameter: 17 mm\u003c\/li\u003e\n\u003cli\u003eSecondary shaft bearing-end diameter: 15 mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf these dimensions do not match your original gearbox, this part should not be fitted. This gearbox family is not suitable for Zongshen Z155 engines.\u003c\/p\u003e\u003ch3\u003eGearbox Specification\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eTransmission: 4-speed\u003c\/li\u003e\n\u003cli\u003eTypical shift pattern: N-1-2-3-4\u003c\/li\u003e\n\u003cli\u003eType: complete gearbox \/ transmission gear set\u003c\/li\u003e\n\u003cli\u003eMaterial: steel gears and shafts\u003c\/li\u003e\n\u003cli\u003eCondition: new aftermarket replacement\u003c\/li\u003e\n\u003cli\u003eBrand: unbranded\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eComponents Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePrimary \/ input shaft assembly\u003c\/li\u003e\n\u003cli\u003eSecondary \/ output shaft assembly\u003c\/li\u003e\n\u003cli\u003eTransmission gear clusters\u003c\/li\u003e\n\u003cli\u003eSliding \/ dog-engagement gears\u003c\/li\u003e\n\u003cli\u003eCirclips, spacers and thrust washers fitted to the assemblies as pictured\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003ePlease note:\u003c\/strong\u003e selector drum and selector forks are not included unless they are specifically shown in the product photographs.\u003c\/p\u003e\u003ch3\u003eCross-Reference Numbers\u003c\/h3\u003e\u003cp\u003eUseful supplier references for this gearbox family include \u003cstrong\u003eGSYX140150160\u003c\/strong\u003e, \u003cstrong\u003eEE14\u003c\/strong\u003e, \u003cstrong\u003eMXF0007\u003c\/strong\u003e, \u003cstrong\u003eR03 04 F\u003c\/strong\u003e and \u003cstrong\u003e557136\u003c\/strong\u003e. These are supplier\/catalogue cross-references only. The supplied product is unbranded and has no verified manufacturer MPN.\u003c\/p\u003e\u003ch3\u003eBefore Ordering\u003c\/h3\u003e\u003cp\u003eDo not order solely from the engine capacity stamped on the bike. Compare the existing gearbox visually and measure both shafts. YX engines have been manufactured with different transmission generations that can look similar externally.\u003c\/p\u003e\u003ch3\u003eDelivery \u0026amp; Returns\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFree UK delivery using the store's standard delivery service\u003c\/li\u003e\n\u003cli\u003eReturns subject to the current Moto Mania UK returns policy\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Unbranded","offers":[{"title":"Default Title","offer_id":57412623958391,"sku":"00975-ENG","price":39.0,"currency_code":"SHP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0528\/8771\/6007\/files\/20260823_153554.jpg?v=1787687072","url":"https:\/\/www.motomaniauk.com\/products\/yx140-pit-bike-4-speed-gearbox-input-output-shaft-gear-set","provider":"Moto Mania UK","version":"1.0","type":"link"}