{"product_id":"gy6-100cc-50mm-qmb139-big-bore-engine-kit-w-head-64mm-non-emission","title":"GY6 100CC 50MM QMB139 Big Bore engine Kit w\/ Head(64mm-Non Emission)","description":"\u003ch1\u003eGY6 100CC 50MM QMB139 Big Bore Engine Kit with 64mm Non-Emission Head\u003c\/h1\u003e\n\u003cp\u003eUpgrade your scooter or ATV with this comprehensive GY6 100cc 50mm Big Bore engine kit, designed for enhanced performance and power. This kit includes a high-performance cylinder head featuring 64mm valves and a non-emission (non-EGR) design, ensuring optimal airflow and combustion efficiency for your QMB139 engine.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e50mm Bore Cylinder:\u003c\/strong\u003e Delivers a true 100cc displacement for significantly increased power output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e64mm Non-Emission Cylinder Head:\u003c\/strong\u003e Features larger intake (17mm) and exhaust (18mm) ports for superior gas flow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerformance Variator Kit:\u003c\/strong\u003e Includes an 87mm outer diameter variator with 8.5g roller weights for improved acceleration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarburetor \u0026amp; Intake:\u003c\/strong\u003e Compatible with setups requiring a 19mm carburetor intake and a 40mm air filter mount.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Component Integration:\u003c\/strong\u003e Comes with essential parts like a 33-tooth oil pump gear and a 3\/16\" in-line fuel filter for a seamless installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCompared to stock 50cc engines or older QMB139 models, this 50mm big bore kit offers a substantial leap in performance. By increasing the bore size to 50mm, it significantly boosts displacement and torque, providing a more robust and responsive ride. The inclusion of a performance-tuned cylinder head with larger valves and a non-emission design further optimizes the engine's breathing capabilities, setting it apart from standard configurations and yielding greater horsepower.\u003c\/p\u003e\n\u003ch2\u003eKey Technical Advantages: Technology and Performance\u003c\/h2\u003e\n\u003cp\u003eThis kit leverages advanced engineering for maximum power and reliability. The 50mm bore cylinder, paired with the precisely designed 64mm non-emission cylinder head, maximizes combustion volume and airflow. Performance-oriented components like the variator with specific roller weights and the optimized intake manifold dimensions ensure that the engine's power is delivered efficiently across the RPM range. The non-emission design removes restrictions, allowing for a purer, higher-output performance profile suitable for enthusiasts seeking an edge.\u003c\/p\u003e","brand":"ChinesePartsUSA","offers":[{"title":"Default Title","offer_id":42469995380885,"sku":"99500","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-64mm-non-emission-27069870440597.jpg?v=1781139046","url":"https:\/\/chinesepartsusa.com\/products\/gy6-100cc-50mm-qmb139-big-bore-engine-kit-w-head-64mm-non-emission","provider":"CHINESE PARTS USA","version":"1.0","type":"link"}