{"product_id":"naraku-qmb139-variator-drive-face","title":"Naraku Performance Variator Drive Face: 139QMB \/ GY6 50","description":"\u003cp\u003eEliminate belt slip and improve throttle response with the \u003cstrong\u003eNaraku CNC Machined Performance Variator Drive Face\u003c\/strong\u003e. Engineered specifically for the 50cc QMB139 (GY6) engine platform, this red anodized aluminum drive face is precision-machined to ensure a perfectly flat contact surface, maximizing belt grip and efficiency throughout the entire RPM range. A direct upgrade over the stock cast face, which develops grooves over time that kill top speed and gear ratio transitions.\u003c\/p\u003e\u003ch3\u003eModel Compatibility\u003c\/h3\u003e\u003cp\u003eFits the \u003cstrong\u003e139QMB \/ QMB139\u003c\/strong\u003e engine family found in most 50cc 4-stroke Chinese scooters:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine codes: 139QMB | 1P39QMB | 139QMA\u003c\/li\u003e\n\u003cli\u003eBrands: TaoTao, Wolf, Ice Bear, Bintelli, Kymco, SYM, and other GY6 50cc platforms\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Machined Surface:\u003c\/strong\u003e High-precision finish optimizes the belt's contact patch, reducing friction-based heat and preventing belt slip.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRed Anodized Finish:\u003c\/strong\u003e Specialized anodizing improves heat dissipation, extending the life of your drive belt and variator rollers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e26-Spline Center Hub:\u003c\/strong\u003e Manufactured to exact OEM tolerances for a rock-solid crankshaft connection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Component Compatible:\u003c\/strong\u003e Works with stock electric start, kick start components, and factory plastic cooling fan.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMaterial: CNC machined aluminum\u003c\/li\u003e\n\u003cli\u003eFinish: Red anodized\u003c\/li\u003e\n\u003cli\u003eSpline Count: 26\u003c\/li\u003e\n\u003cli\u003eSKU: 137-29 | MPN: NK900.59\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eMechanic's Note: The drive face is the outer half of your CVT pulley system. Over time, the stock face develops grooves from the belt that kill top speed — replacing it with this Naraku unit restores original gear ratio transitions. Note: Does NOT include the kick start gear or cooling fan — swap those over from your old unit during installation.\u003c\/em\u003e\u003c\/p\u003e\u003cp\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/p\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cp\u003eGY6 50cc 4-stroke engines: 139QMB, 1P39QMB, 139QMA; TaoTao, Wolf, Ice Bear, Bintelli, Kymco, SYM and other QMB139-platform scooters\u003c\/p\u003e","brand":"Naraku","offers":[{"title":"Default Title","offer_id":67964632006977,"sku":"137-29","price":70.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/137-29_1fe5da8b-3075-4467-8e49-229de8ad60fe.webp?v=1792993055","url":"https:\/\/azscooterparts.com\/products\/naraku-qmb139-variator-drive-face","provider":"AZScooterParts","version":"1.0","type":"link"}