{"product_id":"150cc-gy6-complete-cylinder-head-emission","title":"Universal Parts GY6 57mm Cylinder Head - PAIR Type","description":"\u003cp\u003eGet your GY6 rebuild moving with the \u003cstrong\u003eUniversal Parts 57 mm PAIR Cylinder Head for GY6 150cc engines\u003c\/strong\u003e. This complete replacement head includes installed intake and exhaust valves, valve springs, and intake and exhaust studs, helping you replace a worn or damaged head without starting with an empty casting. Cooling fins and machined sealing surfaces support the original air-cooled engine layout, while the PAIR provision accommodates the secondary-air emissions system.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Valve Assembly:\u003c\/strong\u003e Installed intake and exhaust valves and springs simplify your cylinder-head replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePAIR-Compatible Design:\u003c\/strong\u003e Accommodates the Pulsed Secondary Air Injection system, which introduces air into the exhaust flow to help reduce hydrocarbon and carbon monoxide emissions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e57 mm Application:\u003c\/strong\u003e Designed for compatible 150cc GY6-A four-stroke engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Mounting Studs:\u003c\/strong\u003e Intake and exhaust studs are included for connecting the manifolds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit-Check Dimensions:\u003c\/strong\u003e 54 mm head-stud spacing and 60.5 mm overall height help you match the replacement to your engine.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Universal Parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 164-302\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer part number:\u003c\/strong\u003e 4787\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Complete emissions-type cylinder head\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine platform:\u003c\/strong\u003e GY6-A four-stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary application:\u003c\/strong\u003e 150cc QMJ157\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore application:\u003c\/strong\u003e 57 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall height:\u003c\/strong\u003e 60.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead-stud spacing:\u003c\/strong\u003e 54 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagonal head-stud spacing:\u003c\/strong\u003e 76.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagonal valve-cover bolt spacing:\u003c\/strong\u003e 144 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake valve diameter:\u003c\/strong\u003e 29 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust valve diameter:\u003c\/strong\u003e 23.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmissions provision:\u003c\/strong\u003e PAIR secondary-air system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Installed valves and springs; intake and exhaust studs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eEngine application\u003c\/th\u003e\n\u003cth\u003eFitment requirements\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGY6-A 150cc QMJ157 \/ 157QMJ\u003c\/td\u003e\n\u003ctd\u003eMatch 57 mm bore application, 54 mm stud spacing and head configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGY6 QMI\/QMJ 152\/157 applications\u003c\/td\u003e\n\u003ctd\u003eConfirm cylinder bore, stud spacing, valve-cover bolt layout and PAIR arrangement before ordering\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eMatch the engine code and dimensions to your existing head before installation. For an off-road vehicle that was not equipped with a secondary-air system, the PAIR provision can be blocked off as appropriate for the installation. Do not treat this as a universal fit for every GY6 engine.\u003c\/p\u003e","brand":"Universal Parts","offers":[{"title":"Default Title","offer_id":67964549759297,"sku":"164-302","price":78.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/452508.jpg?v=1792793678","url":"https:\/\/azscooterparts.com\/products\/150cc-gy6-complete-cylinder-head-emission","provider":"AZScooterParts","version":"1.0","type":"link"}