{"product_id":"naraku-qmb139-variator-drive-face-137-29","title":"Naraku Performance Variator Drive Face: 139QMB \/ GY6 50","description":"\u003ch2\u003ePrecision Grip: Naraku Machined Performance Drive Face\u003c\/h2\u003e\u003cp\u003eEliminate belt slip and improve throttle response with the \u003cstrong\u003eNaraku Machined Variator Drive Face\u003c\/strong\u003e. Engineered specifically for the 50cc QMB139 (GY6) engine platform, this high-performance component is the definitive upgrade for riders seeking smoother power delivery and increased drivetrain reliability. Unlike standard cast faces, this Naraku unit is precision-machined to ensure a perfectly flat contact surface, maximizing belt grip and efficiency throughout the entire RPM range.\u003c\/p\u003e\u003ch3\u003eTechnical Performance Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Machined Surface:\u003c\/strong\u003e Features a high-precision finish that optimizes the belt's contact patch, reducing friction-based heat and preventing power-robbing belt slip.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Heat Dissipation:\u003c\/strong\u003e The specialized anodized finish and optimized geometry help pull heat away from the CVT system, extending the life of your drive belt and variator rollers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e26-Spline Fitment:\u003c\/strong\u003e Manufactured to exact OEM tolerances with a reinforced 26-spline center, ensuring a rock-solid connection to the crankshaft.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Component Compatible:\u003c\/strong\u003e Designed to work seamlessly with your stock electric start, kick start components, and factory plastic cooling fan.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eComprehensive Fitment Guide\u003c\/h3\u003e\u003cp\u003eThis drive face is a performance upgrade for the \u003cstrong\u003e139QMB \/ QMB139\u003c\/strong\u003e engine family found in:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003eEngine Type\u003c\/th\u003e\n\u003cth style=\"text-align: left;\"\u003eCommon Brands\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e50cc \/ 49cc 4-Stroke (GY6)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTaoTao, Wolf, Ice Bear, Bintelli, Kymco, SYM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine Codes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e139QMB, 1P39QMB, 139QMA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e CNC Machined Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Performance Anodized (Red)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpline Count:\u003c\/strong\u003e 26\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVendor:\u003c\/strong\u003e Naraku\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003cblockquote\u003e\n\u003cstrong\u003eMechanic's Note:\u003c\/strong\u003e The drive face is the outer half of your transmission's \"pulley\" system. \u003c\/blockquote\u003e\u003cblockquote\u003e\n\u003cstrong\u003ePro Tip:\u003c\/strong\u003e Over time, the stock face develops \"grooves\" from the belt that kill your top speed. Replacing it with this Naraku unit restores your original gear ratio transitions.\u003c\/blockquote\u003e\u003cblockquote\u003e\n\u003cstrong\u003enstallation Hack:\u003c\/strong\u003e This face does \u003cstrong\u003eNOT\u003c\/strong\u003e include the kick start gear or fan—make sure to swap those over from your old unit or grab a fresh \u003cstrong\u003e\u003ca href=\"https:\/\/www.scooterworks.com\"\u003eKick Start Claw\u003c\/a\u003e\u003c\/strong\u003e if yours is worn!\u003c\/blockquote\u003e\u003cp style=\"font-size: 0.85em; color: #666;\"\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e 137-29 \u003cbr\u003e\u003cstrong\u003eMPN:\u003c\/strong\u003e NK900.59 \u003cbr\u003e\u003cstrong\u003eVendor:\u003c\/strong\u003e Naraku\u003c\/p\u003e\u003cul\u003e\u003c\/ul\u003e","brand":"Naraku","offers":[{"title":"Default Title","offer_id":49985985282328,"sku":"137-29","price":59.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/files\/137-29.webp?v=1747246201","url":"https:\/\/www.scooterworks.com\/products\/naraku-qmb139-variator-drive-face-137-29","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}