{"product_id":"glixal-gy6-cylinder-head-assembly-57-4mm-150cc-conversion-non-egr-with-valves-set","title":"Glixal GY6 Cylinder Head Assembly 57.4mm — 150cc Conversion, Non‑EGR with Valves Set","description":"\u003cp\u003e\u003cstrong\u003eGlixal's GY6 57.4mm cylinder head assembly is a non‑EGR replacement that converts compatible GY6 125cc engines to 150cc performance with a complete valves set.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you need a direct-fit replacement or an upgrade path from a 125cc to a full 150cc GY6-style engine, this cylinder head assembly from Glixal provides the larger combustion chamber, matching valve dimensions, and a 4-bolt valve cover interface. It is engineered for most Chinese-made scooters and ATVs using the GY6 150cc 4-stroke platform and is supplied without an EGR port to suit non-EGR conversions and many aftermarket valve covers.\u003c\/p\u003e\n\n\u003ch3\u003eWill this cylinder head fit my GY6 engine?\u003c\/h3\u003e\n\u003cp\u003eThe Glixal head fits GY6 125cc–150cc engines that use a 60mm tall head, a 76mm bolt pattern, and a 4-bolt valve cover. Confirm your current head dimensions and bolt layout before ordering to ensure bolt-hole alignment and correct valve cover fitment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatibility: GY6 125cc to 150cc engines with 60mm tall head\u003c\/li\u003e\n  \u003cli\u003eBolt pattern: 76mm bolt spacing\u003c\/li\u003e\n  \u003cli\u003eValve cover: requires a 4-bolt valve cover\u003c\/li\u003e\n  \u003cli\u003eFits many models: JONWAY, JMSTAR, ROKETA, SUNL, TAOTAO, and others\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the valve and chamber specifications?\u003c\/h3\u003e\n\u003cp\u003eThis assembly ships with matched intake and exhaust valves sized for the 57.4mm combustion chamber to promote reliable seating and predictable performance. Valve lengths and diameters are provided so you can verify rocker arm clearance, spring fitment, and any cam timing considerations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCombustion chamber diameter: 57.4mm\u003c\/li\u003e\n  \u003cli\u003eIntake valve: 28mm OD, 66mm length\u003c\/li\u003e\n  \u003cli\u003eExhaust valve: 23mm OD, 65.5mm length\u003c\/li\u003e\n  \u003cli\u003eNon‑EGR design: no EGR port in the head\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this head support a 125cc-to-150cc upgrade?\u003c\/h3\u003e\n\u003cp\u003eBy increasing the combustion chamber diameter and using valve sizes matched to a 150cc GY6 spec, the head accommodates the larger bore required for 150cc displacement. When combined with a compatible cylinder and piston set, this head helps complete the conversion while retaining standard valve geometry.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for larger bore dimensions used in 150cc conversions\u003c\/li\u003e\n  \u003cli\u003eMaintains stock-style valve dimensions for compatibility\u003c\/li\u003e\n  \u003cli\u003eNon-EGR layout simplifies retrofits on older 125cc engines\u003c\/li\u003e\n  \u003cli\u003eComplete valves set included for direct installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I check before installation?\u003c\/h3\u003e\n\u003cp\u003eInspect bolt pattern alignment, valve clearance, and valve cover compatibility before fitting the head. You may need a compatible gasket set, appropriate torque values, and possibly adjustments to carburetion or fueling after the upgrade.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify 76mm bolt pattern and 60mm head height\u003c\/li\u003e\n  \u003cli\u003eConfirm your valve cover is a 4-bolt design or obtain the correct cover\u003c\/li\u003e\n  \u003cli\u003eUse new head gasket and follow proper torque sequence\u003c\/li\u003e\n  \u003cli\u003eRe-tune carburetor\/fuel mapping after displacement change\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Motorcyclists, scooter owners, and small-ATV enthusiasts who run GY6-style engines and seek a reliable non-EGR cylinder head for repairs or to convert a 125cc small-displacement engine to the 150cc specification. This product is aimed at DIY mechanics and professional shops familiar with GY6 platforms and standard cylinder-head installation procedures.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this head include valves?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the assembly comes with intake and exhaust valves matched to the 57.4mm combustion chamber.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this an EGR-compatible head?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No — this is a non-EGR head and does not have an EGR port.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Glixal","offers":[{"title":"Default Title","offer_id":48085819228318,"sku":"B08RX762F2","price":45.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/glixal-cylinder-head-front-view.jpg?v=1785877949","url":"https:\/\/northtrailauto.ca\/products\/glixal-gy6-cylinder-head-assembly-57-4mm-150cc-conversion-non-egr-with-valves-set","provider":"North Trail Auto","version":"1.0","type":"link"}