{"product_id":"fully-ported-athena-yz125-x-144cc-big-bore-kit-2022-2026-58mm-cylinder","title":"Fully Race Ported Athena YZ125\/X 144cc Big Bore Kit (2022-2026) - 58mm Cylinder","description":"\u003cp\u003eIf you are wanting a ready to rip big bore kit for your Yamaha YZ125 or YZ125X, we have put together the perfect combo.  We have combined a brand new Athena 58mm big bore cylinder kit and added our race porting to it for fully new, race ready cylinder kit. Transform your bike into a fire-breathing 144cc powerhouse.  this combo can compete handily vs 250f race machines, and is as fun as it gets! This kit offers a substantial upgrade over the standard bolt on athena 144.\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eCouple it with our custom HPRD Phathead Billet Head and Insert for even better gains, and our custom tuned GET CDI specific to this 144 kit.\u003c\/p\u003e\n\u003cp\u003eNothing is more fun than a ripping 125cc big bore...and this package delivers smiles!\u003c\/p\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 head and CDI!).  Substantial improvement over std Athena big bore.\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\u003eEnhanced Optimized Porting:\u003c\/b\u003e Improving upon Athena's expertly designed porting ensures excellent flow characteristics.  We have optmized the porting for maximum power.\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 national championship proven shop.\u003c\/p\u003e","brand":"Hp Race Development","offers":[{"title":"Default Title","offer_id":47958651633834,"sku":"P400485100101","price":1799.95,"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\/fully-ported-athena-yz125-x-144cc-big-bore-kit-2022-2026-58mm-cylinder","provider":"Hp Race Development","version":"1.0","type":"link"}