{"product_id":"gy6-50cc-139qmb-adjustable-drive-sheave","title":"GY6 50cc (139QMB) Adjustable Drive Sheave (Premium)","description":"\u003ch2\u003eAdjustable Drive Sheave for 50cc CSC Scooters\u003c\/h2\u003e\u003cp\u003eThe Adjustable Drive Sheave is designed for 50cc scooters equipped with the 139QMB engine. This component improves acceleration and increases top speed, making it a valuable addition for riders looking to boost their scooter's performance. It is one of the \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e that can be easily swapped at home, providing noticeable benefits in both speed and torque delivery.\u003c\/p\u003e\u003ch3\u003ePerformance Benefits\u003c\/h3\u003e\u003cp\u003eThis drive sheave features a design with more linear slots, which optimizes the torque transfer from the engine to the wheels. By improving the efficiency of power delivery, it helps increase both acceleration and overall top speed. Riders will appreciate the increased responsiveness during their rides, especially in urban settings.\u003c\/p\u003e\u003ch3\u003eInstallation Details\u003c\/h3\u003e\u003cp\u003eThis component includes the rear pulley, bearings, and nut, making it ready for installation right out of the box. If you're installing it on a CSC go model, be aware that clutch slider pins are required for proper fitment. Ensure that you have the necessary tools and follow standard installation protocols for the best results.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 118.7mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter:\u003c\/strong\u003e 33.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e rear pulley, bearings, nut\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThis adjustable drive sheave is compatible with various 50cc and 80cc engines that utilize the 139QMB platform. Below are the specific models it fits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCSC Bella Classic 50\u003c\/li\u003e\n\u003cli\u003eCSC go\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\u003eIt also fits engines with the following codes: 139QMA, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, and BD1P39QMB. If your engine has a code that starts with \"QM\" or \"FM\", this component is likely suitable for your vehicle.\u003c\/p\u003e\u003cp\u003eNot sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.\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":"Magic Cars","offers":[{"title":"Default Title","offer_id":52795131822311,"sku":"25-901415","price":102.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2245\/9711\/files\/gy6-50cc-139qmb-adjustable-drive-sheave-1.jpg?v=1791583867","url":"https:\/\/www.magiccars.com\/products\/gy6-50cc-139qmb-adjustable-drive-sheave","provider":"MagicCars","version":"1.0","type":"link"}