{"product_id":"athena-p400485100016-478cc-big-bore-cylinder-kit-98mm-bore-forged-piston-performance-upgrade-converts-450cc-to-478cc-compatible-with-yamaha-yfz450-atv-yz450f-and-wr450f","title":"Athena P400485100016 478cc Big Bore Cylinder Kit (98mm Bore) - Forged Piston Performance Upgrade, Converts 450cc to 478cc, Compatible with Yamaha YFZ450 ATV, YZ450F, and WR450F","description":"\u003cp\u003eUPGRADE YOUR RIDE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low-end torque, and unmatched acceleration from your 450cc four-stroke engine with the Athena Big Bore Cylinder Kit (Part No. P400485100016), a premium race-proven package engineered in Italy to seamlessly convert your factory setup into a high-revving, high-output 478cc powerhouse. Entirely cast from high-grade aluminum and treated with a specialized Motor-Nicksil (Nickel-Silicon) coating, this cylinder guarantees exceptional thermal dissipation, minimal friction, and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict original-equipment reliability. This complete bolt-on kit comes loaded with everything required for a flawless installation—including a widened water-jacket aluminum cylinder, a high-performance forged piston coated with molybdenum, premium rings, wrist pin, clips, and a specific high-tightness multi-layer gasket set—allowing you to dramatically increase track and trail performance without requiring any machining or structural engine modifications to your factory crankcase.\u003cbr\u003e\u003c\/p\u003e","brand":"Athena","offers":[{"title":"Default Title","offer_id":52658982519071,"sku":"P400485100016","price":759.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0813\/2195\/1519\/files\/P400485100016-1.jpg?v=1783364839","url":"https:\/\/massdepot.com\/products\/athena-p400485100016-478cc-big-bore-cylinder-kit-98mm-bore-forged-piston-performance-upgrade-converts-450cc-to-478cc-compatible-with-yamaha-yfz450-atv-yz450f-and-wr450f","provider":"Mass Depot","version":"1.0","type":"link"}