{"product_id":"39mm-qmb139-engine-kit-w-head-64mm-egr-pair","title":"39mm QMB139  engine Kit w\/ Head(64mm-EGR PAIR)","description":"\u003ch1\u003e39mm QMB139 Engine Kit with 64mm EGR Head\u003c\/h1\u003e\n\u003cp\u003eUpgrade your QMB139 50cc engine with this comprehensive 39mm big bore kit, featuring a high-performance cylinder head equipped with 64mm intake and exhaust valves. Designed for enhanced power and reliability, this kit provides the essential components to significantly boost your scooter's performance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e39mm Bore Diameter:\u003c\/strong\u003e Increases engine displacement for greater power output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e64mm Valve Size:\u003c\/strong\u003e Allows for improved air-fuel mixture intake and exhaust gas expulsion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEGR Style Cylinder Head:\u003c\/strong\u003e Engineered for efficient operation and emissions control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Rocker Arms \u0026amp; Retainer:\u003c\/strong\u003e Ensures proper valve train function with the new head.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiston Kit Included:\u003c\/strong\u003e Features a 39mm piston with a 13mm pin diameter for a precise fit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCompared to stock 39mm bore engines, this kit offers a substantial performance gain by optimizing cylinder volume and valve flow. It's engineered to integrate seamlessly with your QMB139 50cc engine, providing a noticeable increase in acceleration and top speed without compromising engine integrity.\u003c\/p\u003e\n\u003ch2\u003eKey Technical Advantages: Technology and Performance\u003c\/h2\u003e\n\u003cp\u003eThis engine kit leverages precision engineering to deliver superior performance. The 39mm bore cylinder, paired with the 64mm valve head, maximizes combustion efficiency. The EGR-compatible design ensures compliance while maintaining robust power delivery. This kit is ideal for enthusiasts seeking a reliable upgrade for their 50cc QMB139 powered vehicles.\u003c\/p\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":42469655117973,"sku":"99513","price":99.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0621\/4425\/0005\/products\/vendor-unknown-parts-categories-default-title-39mm-qmb139-engine-kit-w-head-64mm-egr-pair-27068923871381.jpg?v=1781135817","url":"https:\/\/chinesepartsusa.com\/products\/39mm-qmb139-engine-kit-w-head-64mm-egr-pair","provider":"CHINESE PARTS USA","version":"1.0","type":"link"}