{"product_id":"naraku-performance-qmb139-piaggio-torque-spring-base-137-80","title":"Naraku Performance Torque Spring Base: QMB139\/Piaggio","description":"\u003ch2\u003eEliminate Spring Bind: Naraku Ball-Bearing Torque Spring Base\u003c\/h2\u003e\u003cp\u003eOptimize your CVT's shifting consistency with the \u003cstrong\u003eNaraku Performance Torque Spring Base\u003c\/strong\u003e. This precision-engineered upgrade replaces the static factory spring seat with a high-performance ball-bearing assembly. By allowing the torque spring to pivot and twist freely as it compresses, this base eliminates \"spring bind,\" resulting in smoother downshifting and more predictable acceleration out of corners.\u003c\/p\u003e\u003ch3\u003eTechnical Performance Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-Binding Ball Bearing System:\u003c\/strong\u003e Utilizes a captured bearing race that allows the spring to rotate independently of the pulley, reducing friction and internal stress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved Shift Response:\u003c\/strong\u003e By removing mechanical resistance, the rear pulley can react faster to throttle changes, keeping your engine in its optimal powerband.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal 50cc Fitment:\u003c\/strong\u003e Specifically designed for the 139QMB engine platform and Piaggio\/Gilera 50cc 2-stroke and 4-stroke transmissions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-Profile Design:\u003c\/strong\u003e At only 30mm in height, this base integrates seamlessly with both stock and performance torque springs without requiring modifications to the clutch bell.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eComprehensive Fitment Guide\u003c\/h3\u003e\u003cp\u003eThis Naraku base (NK900.44) is compatible with a wide range of 50cc and 80cc scooters, including:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003eEngine Platform\u003c\/th\u003e\n\u003cth style=\"text-align: left;\"\u003eCompatible Brands\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGY6 50cc (139QMB)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTaoTao, Wolf, Kymco, SYM, Lance, Bintelli\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiaggio 50cc\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVespa ET2\/LX\/S 50, Piaggio Typhoon\/Liberty 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEuro 2-Stroke\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAprilia SR50, Derbi Bullet\/Atlantis, Gilera Runner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHonda Models\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRuckus (Zoomer), Metro (CHF50) - (Verification Recommended)\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\u003eSKU:\u003c\/strong\u003e 137-80\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer MPN:\u003c\/strong\u003e NK900.44\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Height:\u003c\/strong\u003e 30mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Spring base, ball bearings, and hardened bearing race\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequirement:\u003c\/strong\u003e Must be used with \u003ca href=\"#\"\u003eHigh-Temp Bearing Grease\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003cblockquote\u003e\n\u003cstrong\u003ePro-Tuning Note:\u003c\/strong\u003e This kit does \u003cstrong\u003enot\u003c\/strong\u003e include a torque spring. For the ultimate performance setup, we recommend pairing this base with a \u003cstrong\u003eNaraku or NCY 1000-1500 RPM Performance Spring\u003c\/strong\u003e to match your rider weight and terrain.\u003c\/blockquote\u003e\u003cp style=\"font-size: 0.85em; color: #666;\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Professional installation is recommended. High-temp grease is required for the bearing assembly to ensure longevity.\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e\u003cstrong\u003eAbout Naraku:\u003c\/strong\u003e NARAKU is a professional supplier of motorcycle parts from Taiwan. We’ve sold various motorcycle parts, scooter parts and accessories for more than 10 years. Our quality products are sold to Europe, Asia and America. We supply engine parts and accessories for modern scooters and mopeds. With our advanced technologies and the superb quality of our products, we can offer everything your ride needs.\u003c\/span\u003e\u003c\/p\u003e","brand":"Naraku","offers":[{"title":"Default Title","offer_id":50254686650648,"sku":"137-80","price":59.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/files\/705001.jpg?v=1748976362","url":"https:\/\/www.scooterworks.com\/products\/naraku-performance-qmb139-piaggio-torque-spring-base-137-80","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}