{"product_id":"gy6-50cc-139qmb-performance-clutch-set","title":"GY6 50cc (139QMB) Performance Clutch Set","description":"\u003ch2\u003ePerformance Clutch Set for GY6 50cc and 80cc Engines\u003c\/h2\u003e\u003cp\u003eThis GY6 50cc performance clutch set is built for 139QMB-based engines and aims to lift your scooter's output. The kit includes a ventilated clutch bell that sheds heat more readily, which can help the clutch last longer. A 1500 RPM torque spring and 1000 RPM clutch springs are also included for sharper engagement and quicker response at lower speeds. It is a simple option among \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e for a home installation.\u003c\/p\u003e\u003ch3\u003eBetter Heat Handling\u003c\/h3\u003e\u003cp\u003eThe vented clutch bell helps draw heat away during use, which matters for keeping performance steady on longer rides. Beyond supporting a longer service life, this design is meant to deliver consistent results across different riding conditions.\u003c\/p\u003e\u003ch3\u003eStronger Engagement and Throttle Response\u003c\/h3\u003e\u003cp\u003eThe 1500 RPM torque spring provides firmer clutch engagement, so the throttle feels more immediate. Paired with the 1000 RPM clutch springs, the setup is intended to improve low-speed power delivery, giving a smoother ride.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Bell Inner Diameter:\u003c\/strong\u003e 107mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Bell Outer Diameter:\u003c\/strong\u003e 115mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClutch Inner Diameter:\u003c\/strong\u003e 12mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing:\u003c\/strong\u003e 6901 RS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Splines:\u003c\/strong\u003e 22\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter (Peak to Peak):\u003c\/strong\u003e 11mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter (Valley to Valley):\u003c\/strong\u003e 12mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e 1500 RPM torque spring, 1000 RPM clutch springs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 139QMB-based 50cc and 80cc 4-stroke engines, including 139QMA, 1P39QMB and other QMA\/QMB engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e139QMA engines\u003c\/li\u003e\n\u003cli\u003e139QMB engines\u003c\/li\u003e\n\u003cli\u003e1P39QMB engines\u003c\/li\u003e\n\u003cli\u003e1P39QMA-2 engines\u003c\/li\u003e\n\u003cli\u003eYN139QMB engines\u003c\/li\u003e\n\u003cli\u003eJJ1P39QMB engines\u003c\/li\u003e\n\u003cli\u003e139FMA-2 engines\u003c\/li\u003e\n\u003cli\u003eBD1P39QMB engines\u003c\/li\u003e\n\u003cli\u003eBN139QMB engines\u003c\/li\u003e\n\u003cli\u003e147QMD engines\u003c\/li\u003e\n\u003cli\u003eOther QMA engines\u003c\/li\u003e\n\u003cli\u003eOther QMB engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Check the engine code stamped on the engine case against the list above. This set suits 50cc and 80cc 4-stroke engines that use a 22-spline clutch bell.\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-clutches\"\u003eScooter Clutches \u0026amp; Clutch Springs\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-parts\"\u003eScooter Parts\u003c\/a\u003e\u003c\/p\u003e","brand":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51134443192377,"sku":"TT-15696","price":146.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/gy6-50cc-139qmb-performance-clutch-set-1.webp?v=1794343994","url":"https:\/\/www.trendtimes.com\/products\/gy6-50cc-139qmb-performance-clutch-set","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}