{"product_id":"180cc-big-bore-kit-63mm-bore","title":"180cc Big Bore Kit 63mm Bore","description":"The Scooterworks Big Bore Kit offers a significant displacement upgrade for GY6 150cc engines, increasing performance by expanding the engine to 180cc with a 63mm bore.\n\nIncluded components are a cylinder, piston, pin, circlips, rings, head gasket, and base gasket. Key specifications for this kit are a 63mm bore, a 90.5mm overall height, and a 64.9mm cylinder sleeve outer diameter. It is designed to work with a stock stroke of 57.8mm.\n\nCompatibility is broad, covering 157QMJ-based 125cc, 150cc, and 169cc engines with specific engine codes such as 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, and BN161QMK-A, as well as other QMJ, QMK, and QMI models. If the engine code includes \"QM\" or \"FM\", it is likely compatible.\n\nPlease note that installation of this big bore kit may require modification of the engine case to accommodate the larger cylinder. An engine boring tool is available separately.","brand":"Scooterworks","offers":[{"title":"Default Title","offer_id":52866175861048,"sku":"1100-1438","price":127.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687666993.webp?v=1787906421","url":"https:\/\/store.motormia.co\/products\/180cc-big-bore-kit-63mm-bore","provider":"MOTORMIA","version":"1.0","type":"link"}