{"product_id":"rear-axle-output-shaft-for-gy6-50cc-139qmb-133mm","title":"Rear Axle \/ Output Shaft for GY6 50cc (139QMB) \u0026 133mm","description":"\u003ch2\u003eRear Axle for GY6 50cc Engines\u003c\/h2\u003e\u003cp\u003eThe output shaft, sometimes called the rear axle, plays a key role in GY6 50cc scooters. This item is a direct OEM-style replacement made for models that use a 139QMB engine. Its 20-spline ends engage the gears properly, so it is one of the essential \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e for keeping the drivetrain running smoothly and dependably.\u003c\/p\u003e\u003ch3\u003eDesign and Compatibility\u003c\/h3\u003e\u003cp\u003eThis axle is built to suit a range of 50cc and 80cc four-stroke engine codes, 139QMB among them. The overall length is 133mm, and the center shaft has a 27mm diameter. The smooth section measures 17mm across, while the threaded section is 16mm in diameter. Before buying, check the length and dimensions of your current output shaft to confirm it will match.\u003c\/p\u003e\u003ch3\u003eWhen to Replace Your Output Shaft\u003c\/h3\u003e\u003cp\u003eA worn or damaged output shaft can start to disrupt gear engagement and may need swapping out. Warning signs include odd noises or trouble getting power to the wheel. Routinely inspecting your scooter's drivetrain makes it easier to spot when a new axle is needed. Choosing the correct fit matters for dependable operation.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal Length:\u003c\/strong\u003e 133mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSplines:\u003c\/strong\u003e 20 (both ends)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter Shaft Diameter:\u003c\/strong\u003e 27mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmooth End Diameter:\u003c\/strong\u003e 17mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread End Diameter:\u003c\/strong\u003e 16mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Chicago Scooter Company GY6 50cc (139QMB) gear box models: Bella Classic 50, go MAX, Nitro Sport 50\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 50cc (139QMB) (133mm shaft)\u003c\/li\u003e\n\u003cli\u003eCSC Bella Classic 50\u003c\/li\u003e\n\u003cli\u003eCSC Go Max\u003c\/li\u003e\n\u003cli\u003eCSC Nitro Sport 50\u003c\/li\u003e\n\u003cli\u003eCSC Pug 50\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Measure your existing output shaft prior to ordering. It needs to be 133mm long and have 20 splines on both ends.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere it goes:\u003c\/strong\u003e Refer to part #8 on the gear box diagram for the GY6 50cc (139QMB), CSC Go; part #8 on the gear box diagram for the CSC Bella Classic 50; part #8 on the gear box diagram for the CSC Go Max.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOther versions:\u003c\/strong\u003e For CSC Bella and Nitro scooters, this shaft is also listed as the Final Drive Shaft for CSC Bella, Nitro \u0026amp; CSC Scooters: \u003ca href=\"\/products\/rear-axle-output-shaft-final-drive-shaft-for-csc-bella-nitro-csc-scooters\"\u003eRear Axle, Output Shaft, Final Drive Shaft for CSC Bella, Nitro \u0026amp; CSC Scooters\u003c\/a\u003e. For a longer shaft for the GY6 50cc (139QMB), see the ZNEN option: \u003ca href=\"\/products\/znen-rear-axle-output-shaft-final-drive-shaft-long-gy6-50cc-139qmb\"\u003eZNEN Rear Axle Output Shaft, Final Drive Shaft - Long GY6 50cc (139QMB)\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShop more:\u003c\/strong\u003e \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc Scooter Parts (139QMB)\u003c\/a\u003e · \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 Scooter Parts\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-parts\"\u003eScooter Parts\u003c\/a\u003e\u003c\/p\u003e","brand":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51138797830201,"sku":"TT-26800","price":13.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/rear-axle-output-shaft-for-gy6-50cc-139qmb-133mm-1.jpg?v=1794377865","url":"https:\/\/www.trendtimes.com\/products\/rear-axle-output-shaft-for-gy6-50cc-139qmb-133mm","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}