{"product_id":"ncy-racing-valves-gy6-1100-1257","title":"NCY High-RPM Racing Valve Set - 28\/23mm for GY6","description":"\u003cp\u003eNCY Performance Racing Valves deliver a noticeable improvement in idle quality and high-end pull on GY6 125cc, 150cc, and 171cc engines. Precision-lapped seats ensure a perfect 360° seal, eliminating compression loss and erratic idling common with soft factory valves that stretch or leak under high stress.\u003c\/p\u003e\u003cp\u003eThese are also the OEM replacement valves for the \u003ca href=\"https:\/\/www.scooterworks.com\/products\/ncy-big-valve-high-flow-cylinder-head-61mm-gy6-171cc\"\u003eNCY Big Valve High-Flow Cylinder Head (SKU 1100-1254)\u003c\/a\u003e. Made in Taiwan. SKU: 1100-1257.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrecision lapped seats — perfect 360° seal eliminates compression loss and erratic idle\u003c\/li\u003e\n\u003cli\u003eHigh-heat durability resists mushrooming and carbon buildup vs. OEM valves\u003c\/li\u003e\n\u003cli\u003eOptimized flow profile for high-flow heads at 10,000+ RPM\u003c\/li\u003e\n\u003cli\u003eIN: 27.8mm \/ EX: 22.9mm — fits GY6 125cc, 150cc, and 171cc BBK applications\u003c\/li\u003e\n\u003cli\u003ePremium NCY manufacturing for superior balance and longevity\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eIntake Valve (IN): 27.8mm OD | 65.75mm height | 5.0mm stem\u003c\/li\u003e\n\u003cli\u003eExhaust Valve (EX): 22.9mm OD | 65.3mm height | 5.0mm stem\u003c\/li\u003e\n\u003cli\u003eMPN: 665C13GY628LL\u003c\/li\u003e\n\u003cli\u003eSKU: 1100-1257\u003c\/li\u003e\n\u003cli\u003eOrigin: Made in Taiwan\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eEngine Codes \/ Models\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGenuine Scooter Co.\u003c\/td\u003e\n\u003ctd\u003eBuddy 125, Buddy 150, Buddy 170i, Blur 150\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard GY6 Codes\u003c\/td\u003e\n\u003ctd\u003e157QMJ, 152QMI, 161QMK, 1P61QMK, YN1P57QMJ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBig Bore Kits\u003c\/td\u003e\n\u003ctd\u003e58.5mm (155cc), 61mm (171cc), 62mm, 63mm BBKs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTech Tip:\u003c\/strong\u003e Pair with NCY Performance Valve Springs rated for 11,000 RPM. Always lap new valves into the head with fine-grit grinding compound to ensure a gas-tight seal before final assembly.\u003c\/p\u003e\u003cp\u003eThis product is intended for off-road use only. Not legal for use in California on pollution-controlled vehicles. Check local laws before installing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePerformance upgrades are considered racing parts and are not covered by warranty.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003ca href=\"http:\/\/www.p65warnings.ca.gov\"\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/a\u003e\u003c\/p\u003e","brand":"NCY","offers":[{"title":"Default Title","offer_id":48111872704699,"sku":"1100-1257","price":37.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/1340\/6651\/files\/1100-1257.webp?v=1784297570","url":"https:\/\/thriftyscooters.com\/products\/ncy-racing-valves-gy6-1100-1257","provider":"Thrifty Scooters","version":"1.0","type":"link"}