{"product_id":"yz144cc-big-bore-cylinder-kit-58mm-yamaha-yz125-2022-2026-yz125x-2023-2026","title":"Athena YZ125\/X 144cc Big Bore Kit (2022-2026) - 58mm Cylinder","description":"\u003cp\u003eUnleash the full potential of your Yamaha YZ125 or YZ125X with the HP Race Development Athena 144cc Big Bore Kit! Transform your bike into a fire-breathing 144cc powerhouse, delivering significantly increased horsepower and torque for superior performance on the track or trail. This kit offers a substantial upgrade over stock, providing the competitive edge you need for motocross, enduro, or aggressive trail riding.\u003c\/p\u003e\n\u003ch2\u003e\u003cb\u003eKey Features:\u003c\/b\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eMassive Power Gains:\u003c\/b\u003e Experience a significant jump in horsepower (up to 45 HP with HPRD porting!). Stock YZ125 increases from ~33 to 37 HP out-of-the-box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eComplete Kit:\u003c\/b\u003e Includes 58mm cylinder, modular head with bronze inner dome, forged piston kit, Ergal 7075 power valves, and complete gasket set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSuperior Design:\u003c\/b\u003e O-ring head design for enhanced tuning flexibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOptimized Porting:\u003c\/b\u003e Athena's expertly designed porting ensures excellent flow characteristics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRace-Ready:\u003c\/b\u003e Engineered for maximum combustion efficiency and reliability under demanding race conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cb\u003eFitment:\u003c\/b\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha YZ125 (2022-2026)\u003c\/li\u003e\n\u003cli\u003eYamaha YZ125X (2023-2026)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eImportant Note:\u003c\/b\u003e This kit requires case machining for proper installation. This is NOT a drop-in kit! Professional installation is highly recommended.\u003c\/p\u003e\n\u003cp\u003eWe stand behind the quality of our performance parts. This kit is backed by HPRD's commitment to excellence and customer satisfaction. Ride with confidence knowing you're equipped with the best.\u003c\/p\u003e","brand":"Hp Race Development","offers":[{"title":"Default Title","offer_id":47815046725802,"sku":"P400485100101","price":1298.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0685\/4226\/7562\/files\/YZ144_Big_Bore_kit.jpg?v=1767222212","url":"https:\/\/v2n80g-j1.myshopify.com\/products\/yz144cc-big-bore-cylinder-kit-58mm-yamaha-yz125-2022-2026-yz125x-2023-2026","provider":"Hp Race Development","version":"1.0","type":"link"}