{"product_id":"gy6-100cc-50mm-qmb139-big-bore-engine-kit-w-head-69mm-egr-pair","title":"GY6 100CC 50MM QMB139 Big Bore engine Kit w\/ Head(69mm-EGR PAIR)","description":"\u003ch2\u003eGY6 100CC 50MM QMB139 Big Bore Engine Kit with 69mm EGR PAIR Head\u003c\/h2\u003e\n\u003cp\u003eUpgrade your scooter's performance with this comprehensive GY6 100CC 50MM QMB139 Big Bore Engine Kit, designed to significantly boost power and efficiency. This kit features a precisely engineered 50mm bore cylinder and a high-performance cylinder head with 69mm valves, ready to transform your QMB139 engine.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e50mm Piston Diameter\u003c\/strong\u003e: Delivers a 100cc displacement for substantially increased power output compared to stock 50cc engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e69mm Valve Cylinder Head\u003c\/strong\u003e: Equipped with 69mm intake and exhaust valves and a 17mm intake port diameter, allowing for superior airflow and combustion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50mm Bore Cylinder Body\u003c\/strong\u003e: Precisely machined for optimal fitment and thermal management, ensuring durability under increased load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEGR (Exhaust Gas Recirculation) PAIR Style Head\u003c\/strong\u003e: Features specific porting designed for compatibility with EGR systems, maintaining emission compliance while enhancing performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Variator Kit Included\u003c\/strong\u003e: Comes with a variator featuring a 62-tooth drive face and 8.5g roller weights, optimizing power delivery across the RPM range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis engine kit represents a significant leap forward from standard 50cc QMB139 engines, offering a noticeable increase in torque and top speed. Unlike previous generations or basic upgrade kits, this package integrates larger bore components with a carefully matched cylinder head and variator system, ensuring a more complete and effective performance enhancement for riders seeking a true power upgrade.\u003c\/p\u003e\n\u003ch3\u003eKey Technical Advantages: Advanced Technology and Proven Performance\u003c\/h3\u003e\n\u003cp\u003eExperience enhanced power and reliability with advanced engineering. This kit leverages precise machining and quality components to deliver a robust performance upgrade, transforming your riding experience with increased acceleration and sustained power.\u003c\/p\u003e","brand":"ChinesePartsUSA","offers":[{"title":"Default Title","offer_id":42470045089941,"sku":"99503","price":129.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0621\/4425\/0005\/products\/chinesepartsusa-parts-categories-default-title-gy6-100cc-50mm-qmb139-big-bore-engine-kit-w-head-69mm-egr-pair-27069976707221.jpg?v=1781140152","url":"https:\/\/chinesepartsusa.com\/products\/gy6-100cc-50mm-qmb139-big-bore-engine-kit-w-head-69mm-egr-pair","provider":"CHINESE PARTS USA","version":"1.0","type":"link"}