{"product_id":"39mm-qmb139-engine-kit-w-head-64mm-non-emission","title":"39mm QMB139  engine Kit w\/ Head(64mm-Non Emission)","description":"\u003ch1\u003e39mm QMB139 Engine Kit with 64mm Non-Emission Head\u003c\/h1\u003e\n\u003cp\u003eThis comprehensive 39mm QMB139 engine kit is engineered for 50cc 4-stroke GY6 engines, featuring a high-performance non-emission cylinder head with 64mm valves. It's designed to upgrade power and efficiency for a wide range of scooters, ATVs, and go-karts.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003e39mm Bore Cylinder:\u003c\/strong\u003e Provides increased displacement for enhanced power output and torque from your QMB139 engine.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e64mm Valve Size:\u003c\/strong\u003e Features larger intake and exhaust valves within the cylinder head for improved airflow and combustion efficiency.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNon-Emission (Non-EGR) Cylinder Head:\u003c\/strong\u003e Optimized for performance by removing emissions control components, allowing for a cleaner burn and higher power potential.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e13mm Piston Pin Diameter:\u003c\/strong\u003e Ensures robust connection and durability for the piston within the cylinder assembly.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e17mm Intake Port Diameter:\u003c\/strong\u003e Facilitates a strong volume of air-fuel mixture entering the combustion chamber, crucial for performance gains.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCompared to standard 50cc GY6 engines, this 39mm big bore kit offers a significant performance uplift. It bypasses the complexities of emission control systems, focusing purely on maximizing power and responsiveness for riders seeking an edge. This kit provides a direct upgrade path for those looking to surpass the limitations of factory-spec engines.\u003c\/p\u003e\n\u003ch2\u003eKey Technical Advantages: Technology and Performance\u003c\/h2\u003e\n\u003cp\u003eThis engine kit integrates advanced design principles to deliver superior performance. The precision-machined 39mm bore and large 64mm valves promote optimal gas exchange, while the non-emission cylinder head design streamlines combustion for increased horsepower. Combined with other compatible GY6 performance components, this kit empowers your vehicle with exhilarating acceleration and sustained power.\u003c\/p\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":42469662982293,"sku":"99512","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-non-emission-27068936683669.jpg?v=1781136068","url":"https:\/\/chinesepartsusa.com\/products\/39mm-qmb139-engine-kit-w-head-64mm-non-emission","provider":"CHINESE PARTS USA","version":"1.0","type":"link"}