{"product_id":"gy6-big-valve-cylinder-head-61mm-171cc-kits","title":"GY6 Big Valve Cylinder Head - 61mm 171cc Kits","description":"\u003ch2\u003e61mm Big Valve Cylinder Head for GY6 171cc Engines\u003c\/h2\u003e\u003cp\u003eThis 61mm big valve cylinder head is built to raise the output of a 171cc GY6 engine. It is meant to be used with the 61mm big bore kit (1100-1288), which allows more air to flow through the engine. The head plays a key role in quicker throttle response and better acceleration. It is one of the \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 scooter parts\u003c\/a\u003e you can use to upgrade your engine.\u003c\/p\u003e\u003ch3\u003eBetter Airflow from Larger Valves\u003c\/h3\u003e\u003cp\u003eThe head uses bigger intake and exhaust valves, at 27.8 mm and 22.9 mm. A two-valve combustion chamber and a precisely machined mating surface help air move through the engine more freely. Its heat-dispersing body also helps the engine run steadily during hard riding.\u003c\/p\u003e\u003ch3\u003eFitting and Compatibility\u003c\/h3\u003e\u003cp\u003eValves and valve springs come already installed, so assembly is simple. The camshaft, rocker arm assembly, and cylinder set are not included and must be bought separately. To confirm a match with GY6-A engines, check that the cylinder studs are spaced 54 mm apart and 76 mm apart diagonally.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 622C03GY661\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget Cylinder:\u003c\/strong\u003e 61 mm \/ 171cc kit 1100-1288\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Stud Spacing:\u003c\/strong\u003e 54 mm, 76 mm diagonal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Valve Diameter:\u003c\/strong\u003e 27.8 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Valve Diameter:\u003c\/strong\u003e 22.9 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Thread:\u003c\/strong\u003e 8 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GY6 150cc (157QMJ) engines with the NCY 61mm 171cc big bore kit (1100-1288), 54 mm stud spacing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eCompatible with:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 150cc (157QMJ) engine (with NCY 61mm 171cc kit 1100-1288, 54 mm stud spacing, GY6-A case)\u003c\/li\u003e\n\u003cli\u003eBuddy 150 and Blur 150 (with compatible GY6-A engine)\u003c\/li\u003e\n\u003cli\u003eTaoTao, Wolf, Ice Bear, Bintelli, Peace Sports, ZNEN, SSR and SYM scooters (select, with matching engines)\u003c\/li\u003e\n\u003cli\u003eHammerhead 150, Trailmaster 150, Yerf-Dog and Carter Talon karts (select, with matching engines)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Make sure the 61 mm bore matches the NCY kit 1100-1288 and the 54 mm cylinder stud spacing matches your GY6-A engine case. It will not fit GY6 B-block cases.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere it goes:\u003c\/strong\u003e part #1 on the cylinder head diagram for the GY6 150cc (157QMJ).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOther versions:\u003c\/strong\u003e For a GY6 cylinder head with valve guides for 125 cc, see \u003ca href=\"\/products\/cylinder-head-with-valve-guides-for-genuine-gy6-125-cc\"\u003eCylinder Head (With Valve Guides) for Genuine, GY6 125 cc\u003c\/a\u003e. For the GY6 150cc (157QMJ) Blue Line head at 57mm, see \u003ca href=\"\/products\/gy6-150cc-157qmj-engines-cylinder-head-57mm\"\u003eGY6 150cc (157QMJ) Engines Cylinder Head 57mm\u003c\/a\u003e. For the GY6 big valve head at 58.5mm with 2 valves, see \u003ca href=\"\/products\/genuine-gy6-big-valve-cylinder-head-58-5mm-2-valve\"\u003eGenuine\/GY6 Big Valve Cylinder Head (58.5mm, 2 Valve)\u003c\/a\u003e.\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":51138794815545,"sku":"TT-26784","price":146.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/gy6-big-valve-cylinder-head-61mm-171cc-kits-1.png?v=1794377841","url":"https:\/\/www.trendtimes.com\/products\/gy6-big-valve-cylinder-head-61mm-171cc-kits","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}