{"product_id":"adjustable-drive-sheave-for-50cc-139qmb-engines","title":"Adjustable Drive Sheave for 50cc 139QMB Engines","description":"The Naraku QMB139 Adjustable Drive Sheave, also known as a torque driver or secondary slider, is engineered to enhance the performance of scooters equipped with 50cc 139QMB engines. Featuring a design with more linear slots, this component directly contributes to improved acceleration and an increased top speed, offering a noticeable performance upgrade.\n\nThis adjustable drive sheave includes the rear pulley, bearings, and nut, providing a comprehensive solution for enhancing your scooter's drivetrain. The unit has an overall outer diameter of 118.7mm and an inner diameter of 33.5mm.\n\nCompatibility is broad for 139QMB-based 50cc \/ 80cc engines, including models with engine codes such as 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, and 147QMD, as well as other QMA and QMB models. If the engine code includes \"QM\" or \"FM\", this product is likely compatible.\n\nSpecial compatibility notes apply to certain CSC models, including the Bella Classic 50, CSC go, CSC go MAX, CSC Nitro Sport 50, and CSC Pug 50. For CSC go models, specific clutch slider pins may be required.","brand":"Naraku","offers":[{"title":"Default Title","offer_id":52663083761976,"sku":"137-30","price":105.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687514761.jpg?v=1784323645","url":"https:\/\/store.motormia.co\/products\/adjustable-drive-sheave-for-50cc-139qmb-engines","provider":"MOTORMIA","version":"1.0","type":"link"}