{"product_id":"gy6-high-rpm-racing-valve-set-28-23mm","title":"GY6 High-RPM Racing Valve Set - 28\/23mm","description":"\u003ch2\u003eGY6 High-RPM Racing Valve Set for GY6 125cc, 150cc, and 171cc Engines\u003c\/h2\u003e\u003cp\u003eThis racing valve set suits GY6 125cc, 150cc, and 171cc engines and is aimed at riders who want a noticeable boost in performance. It should deliver smoother running and stronger acceleration at higher revs. As one of the \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 scooter parts\u003c\/a\u003e in our range, it addresses frequent problems such as rough idling and loss of compression. Fit these valves to get a more responsive and capable engine.\u003c\/p\u003e\u003ch3\u003ePrecision-Lapped Seats for Reliable Sealing\u003c\/h3\u003e\u003cp\u003eEach valve has precision-lapped seats that create a full 360° seal. This design cuts down on compression loss, which helps the engine idle more steadily. The valves also tolerate high heat, which reduces mushrooming and carbon build-up that often affect factory valves under demanding use.\u003c\/p\u003e\u003ch3\u003eEngine Compatibility\u003c\/h3\u003e\u003cp\u003eThe valves are built for high-flow setups and can handle RPMs above 10,000. The intake valve measures 27.8mm and the exhaust valve measures 22.9mm, so they work with a range of big bore kits. Before final installation, seat the new valves properly in the cylinder head using fine-grit grinding compound to achieve a tight seal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Valve (IN):\u003c\/strong\u003e 27.8mm OD | 65.75mm height | 5.0mm stem\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Valve (EX):\u003c\/strong\u003e 22.9mm OD | 65.3mm height | 5.0mm stem\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e 665C13GY628LL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GY6 150cc (157QMJ) engine\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\u003cli\u003eGY6 150cc (157QMJ)\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhere it goes:\u003c\/strong\u003e part #8 on the camshaft and valve diagram for the GY6 150cc (157QMJ).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShop more:\u003c\/strong\u003e \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 Scooter Parts\u003c\/a\u003e · \u003ca href=\"\/collections\/chinese-scooter-parts\"\u003eChinese Scooter Parts\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-cylinder-heads\"\u003eScooter Cylinder Heads \u0026amp; Valves\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-parts\"\u003eScooter Parts\u003c\/a\u003e\u003c\/p\u003e","brand":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51138792194105,"sku":"TT-26769","price":34.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/high-rpm-racing-valve-set-28-23mm-for-gy6-1.webp?v=1794377821","url":"https:\/\/www.trendtimes.com\/products\/gy6-high-rpm-racing-valve-set-28-23mm","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}