{"product_id":"gy6s-1100-1257-ncy-28-23mm-high-rpm-racing-intake-exhaust-valves-gy6-125-150-171cc-big-bore","title":"NCY 28\/23mm High RPM Racing Intake Exhaust Valves GY6 125 150 171cc Big Bore","description":"NCY HIGH-RPM RACING VALVE SET \u003ch3\u003e28mm INTAKE \/ 23mm EXHAUST • GY6 PERFORMANCE\u003c\/h3\u003e \u003cp\u003eUpgrade or rebuild your performance GY6 cylinder head with the \u003cstrong\u003eNCY High-RPM Racing Valve Set\u003c\/strong\u003e.\u003c\/p\u003e \u003cp\u003eDesigned for compatible \u003cstrong\u003eGY6 125cc, 150cc and big-bore performance engines\u003c\/strong\u003e, these oversized valves feature a \u003cstrong\u003e27.8mm intake and 22.9mm exhaust\u003c\/strong\u003e with 5mm valve stems.\u003c\/p\u003e \u003cp\u003eThey are also the correct replacement valve set for the \u003cstrong\u003eNCY Big Valve High-Flow Cylinder Head – SKU 1100-1254\u003c\/strong\u003e.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eMade in Taiwan by NCY.\u003c\/strong\u003e\u003c\/p\u003e \u003ch2\u003eWHAT'S INCLUDED\u003c\/h2\u003e \u003cp\u003e\u003cstrong\u003e1 × NCY Intake Valve\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e1 × NCY Exhaust Valve\u003c\/strong\u003e\u003c\/p\u003e \u003ch2\u003eVALVE SPECIFICATIONS\u003c\/h2\u003e \u003ch3\u003eINTAKE VALVE\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eValve Head Diameter: \u003cstrong\u003e27.8mm\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eOverall Length: \u003cstrong\u003e65.75mm\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eStem Diameter: \u003cstrong\u003e5.0mm\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eEXHAUST VALVE\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eValve Head Diameter: \u003cstrong\u003e22.9mm\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eOverall Length: \u003cstrong\u003e65.3mm\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eStem Diameter: \u003cstrong\u003e5.0mm\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eMPN:\u003c\/strong\u003e 665C13GY628LL\u003cbr\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e 1100-1257\u003cbr\u003e\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/p\u003e \u003ch2\u003ePERFORMANCE FEATURES\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eOversized \u003cstrong\u003e27.8mm intake \/ 22.9mm exhaust\u003c\/strong\u003e valve configuration\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eDesigned for compatible high-flow GY6 cylinder heads\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePrecision-finished valve seating surfaces\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eHelps maintain proper cylinder sealing and compression\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eDesigned for demanding performance and higher-RPM applications\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eIncreased airflow potential compared with smaller stock-valve configurations\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eExcellent for compatible big-bore and high-flow cylinder-head builds\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePremium NCY performance component\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eMade in Taiwan\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003ePERFECT REPLACEMENT FOR NCY BIG VALVE HEAD\u003c\/h2\u003e \u003cp\u003eThese are the replacement valves for the:\u003c\/p\u003e \u003ch3\u003eNCY BIG VALVE HIGH-FLOW CYLINDER HEAD\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003eSKU: 1100-1254\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eThat cylinder head uses the same:\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003e27.8mm Intake Valve\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e22.9mm Exhaust Valve\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e5.0mm Valve Stems\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eCylinder head is NOT included with this listing.\u003c\/strong\u003e\u003c\/p\u003e \u003ch2\u003eCOMMON PERFORMANCE APPLICATIONS\u003c\/h2\u003e \u003cp\u003eDesigned for compatible GY6 cylinder heads found on:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eGY6 125cc engines\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eGY6 150cc engines\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e155cc performance builds\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e169cc \/ 171cc performance builds\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e58.5mm big-bore applications\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e61mm big-bore applications\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e62mm \/ 63mm builds \u003cstrong\u003ewhen using a compatible cylinder head\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eNCY high-flow performance cylinder heads\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eCommon compatible engine families can include:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003e152QMI\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003e157QMJ\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003e1P57QMJ\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eYN1P57QMJ\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eOther compatible QMI \/ QMJ configurations using these exact valve dimensions\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e ⚠ IMPORTANT FITMENT INFORMATION \u003ch3\u003eWILL NOT FIT QMK \/ K-BLOCK CYLINDER HEADS\u003c\/h3\u003e \u003cp\u003eThese valves should \u003cstrong\u003eNOT\u003c\/strong\u003e be purchased for:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003e161QMK\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003e1P61QMK\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eBN161QMK-A\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eQMK cylinder heads\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eK-Block \/ QMK cylinder heads\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eQMK\/K-Block engines use a different cylinder-head\/valve configuration.\u003c\/p\u003e \u003ch3\u003eDO NOT ORDER BY ENGINE DISPLACEMENT ALONE.\u003c\/h3\u003e \u003cp\u003eA scooter being labeled \u003cstrong\u003e150cc, 170cc or 171cc does not guarantee fitment.\u003c\/strong\u003e\u003c\/p\u003e \u003ch2\u003eVERIFY YOUR OLD VALVES BEFORE ORDERING\u003c\/h2\u003e \u003cp\u003ePlease compare your existing valves with these measurements:\u003c\/p\u003e \u003ch3\u003eINTAKE\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003e27.8mm Head × 65.75mm Length × 5.0mm Stem\u003c\/strong\u003e\u003c\/p\u003e \u003ch3\u003eEXHAUST\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003e22.9mm Head × 65.3mm Length × 5.0mm Stem\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eModified engines and aftermarket cylinder heads may use different valve sizes even when the engine code appears compatible.\u003c\/p\u003e \u003ch2\u003eGENUINE SCOOTER APPLICATIONS\u003c\/h2\u003e \u003cp\u003eThese valves may be used with compatible performance cylinder-head configurations associated with applications such as:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eGenuine Buddy 125\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eGenuine Buddy 150\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eGenuine Buddy 170i\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eGenuine Blur 150\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eIMPORTANT:\u003c\/strong\u003e Verify the existing cylinder head and valve dimensions before ordering. Model name alone should not be used to determine fitment.\u003c\/p\u003e \u003ch2\u003eIDEAL FOR PERFORMANCE BUILDS\u003c\/h2\u003e \u003cp\u003eA great choice when rebuilding or servicing a compatible performance GY6 cylinder head used with:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eBig-bore cylinder kits\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eHigh-flow cylinder heads\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePerformance camshafts\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eLarger carburetors\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePerformance intake systems\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePerformance exhaust systems\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eHigher-RPM engine combinations\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eWhen building a modified engine, always verify valve-to-piston clearance, valve-seat compatibility, valve guides, retainers, keepers and spring compatibility before operation.\u003c\/p\u003e FITMENT AT A GLANCE \u003ch3\u003e✓ 27.8mm INTAKE\u003c\/h3\u003e \u003ch3\u003e✓ 22.9mm EXHAUST\u003c\/h3\u003e \u003ch3\u003e✓ 5mm VALVE STEMS\u003c\/h3\u003e \u003ch3\u003e✓ GY6 QMI \/ QMJ COMPATIBLE HEADS\u003c\/h3\u003e \u003ch3\u003e✓ NCY BIG VALVE HEAD SKU 1100-1254\u003c\/h3\u003e \u003ch3\u003e✓ PERFORMANCE \/ BIG-BORE APPLICATIONS\u003c\/h3\u003e \u003ch3\u003e✕ NOT FOR QMK HEADS\u003c\/h3\u003e \u003ch3\u003e✕ NOT FOR 161QMK\u003c\/h3\u003e \u003ch3\u003e✕ NOT FOR 1P61QMK\u003c\/h3\u003e \u003ch3\u003e✕ NOT FOR K-BLOCK \/ QMK HEADS\u003c\/h3\u003e \u003ch3\u003eNCY PERFORMANCE\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003e28\/23mm HIGH-RPM RACING VALVE SET\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eMADE IN TAIWAN\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eMPN: 665C13GY628LL | SKU: 1100-1257\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eDistributed by JPstore\u003c\/strong\u003e\u003c\/p\u003e","brand":"ChinesePartsPro","offers":[{"title":"Default Title","offer_id":53556396458296,"sku":"1100-1257","price":25.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0011\/8898\/6997\/files\/1100-1257_1220x1220_crop_center.webp__09817.1787072363.jpg?v=1792867947","url":"https:\/\/www.chinesepartspro.com\/products\/gy6s-1100-1257-ncy-28-23mm-high-rpm-racing-intake-exhaust-valves-gy6-125-150-171cc-big-bore","provider":"ChinesePartsPro","version":"1.0","type":"link"}