{"product_id":"gy6-50cc-139qmb-compression-spring-performance","title":"GY6 50cc (139QMB) Compression Spring (Performance)","description":"\u003ch2\u003ePerformance Compression Spring for 50cc 139QMB Engines\u003c\/h2\u003e\u003cp\u003eThis performance compression spring is specifically designed for 50cc 139QMB engines. It plays an important role in engaging the belt and affects how the CVT transmission shifts from low to high gear. As one of the \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e, this spring is available in three RPM options: 1k, 1.5k, and 2k, allowing you to tailor your scooter's performance to your riding style.\u003c\/p\u003e\u003ch3\u003eFunctionality of Compression Springs\u003c\/h3\u003e\u003cp\u003eCompression springs are key components that provide the necessary pressure to engage the drive belt effectively. The RPM rating of the spring determines the shifting behavior of the transmission. A 1000 RPM spring will initiate a gear change at a lower speed compared to a 2000 RPM spring, which can lead to different performance characteristics during acceleration.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWire Diameter:\u003c\/strong\u003e 4.0mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter:\u003c\/strong\u003e 49.0mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 106.0mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable RPMs:\u003c\/strong\u003e 1k, 1.5k, 2k\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThis part is compatible with various 50cc and 80cc engines, particularly those with the following engine codes:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e139QMA\u003c\/li\u003e\n\u003cli\u003e139QMB\u003c\/li\u003e\n\u003cli\u003e1P39QMB\u003c\/li\u003e\n\u003cli\u003e1P39QMA-2\u003c\/li\u003e\n\u003cli\u003eYN139QMB\u003c\/li\u003e\n\u003cli\u003eJJ1P39QMB\u003c\/li\u003e\n\u003cli\u003e139FMA-2\u003c\/li\u003e\n\u003cli\u003eBD1P39QMB\u003c\/li\u003e\n\u003cli\u003eBN139QMB\u003c\/li\u003e\n\u003cli\u003e147QMD\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf your engine code contains \"QM\" or \"FM,\" this spring is likely a suitable match for your vehicle.\u003c\/p\u003e\u003cp\u003eNot sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.\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-parts\"\u003eScooter Parts\u003c\/a\u003e\u003c\/p\u003e","brand":"Magic Cars","offers":[{"title":"1000 RPM","offer_id":52800361496807,"sku":"25-914683","price":18.0,"currency_code":"USD","in_stock":true},{"title":"1500 RPM","offer_id":52800361529575,"sku":"25-914684","price":18.0,"currency_code":"USD","in_stock":true},{"title":"2000 RPM","offer_id":52800361562343,"sku":"25-914685","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2245\/9711\/files\/compression-spring-performance-for-gy6-50cc-139qmb-1.jpg?v=1791665740","url":"https:\/\/www.magiccars.com\/products\/gy6-50cc-139qmb-compression-spring-performance","provider":"MagicCars","version":"1.0","type":"link"}