{"product_id":"cilindro-athena-478cc-yamaha-yzf-450-r-09-25","title":"Athena Big Bore Cylinder 478cc Yamaha YZF 450 R 09-25","description":"\u003cp\u003e\u003cstrong\u003eAthena Big Bore Cylinder 478cc\u003c\/strong\u003e for \u003cstrong\u003eYamaha YFZ 450 R\u003c\/strong\u003e and \u003cstrong\u003eYFZ 450 X\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThis is not a replacement part, it is a serious upgrade. By increasing the bore to \u003cstrong\u003e98 mm\u003c\/strong\u003e and the displacement to \u003cstrong\u003e478.2 cc\u003c\/strong\u003e, the engine’s character changes completely: \u003cstrong\u003emore torque from low revs\u003c\/strong\u003e, a much fuller power delivery, and a constant push as the engine starts to rev out.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003e12.5:1 compression ratio\u003c\/strong\u003e makes each combustion more effective, so you’ll notice the engine responds more directly to the throttle and gains strength across the entire range, especially in areas where the stock cylinder falls short.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eAthena cylinder\u003c\/strong\u003e is made of \u003cstrong\u003ealuminum\u003c\/strong\u003e with an internal \u003cstrong\u003enickel and silicon\u003c\/strong\u003e coating, allowing it to operate at higher temperatures and loads without compromising wear. The \u003cstrong\u003eforged piston\u003c\/strong\u003e is designed to withstand this increased demand, maintaining stability even under intensive use.\u003c\/p\u003e\n\u003cp\u003eOn the test bench, it’s clear: the engine gains power throughout the entire rev range and keeps pushing where the original drops off, reaching up to \u003cstrong\u003e46 hp\u003c\/strong\u003e with the right electronics.\u003c\/p\u003e\n\u003cp\u003eThe kit includes \u003cstrong\u003ecylinder\u003c\/strong\u003e, \u003cstrong\u003episton\u003c\/strong\u003e, \u003cstrong\u003erings\u003c\/strong\u003e, \u003cstrong\u003ewrist pin\u003c\/strong\u003e, and \u003cstrong\u003egasket set\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Athena\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference:\u003c\/strong\u003e P400485100047\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 478.2 cc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 98 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStroke:\u003c\/strong\u003e 63.4 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression ratio:\u003c\/strong\u003e 12.5:1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.17 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCompatible models\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eYAMAHA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYFZ 450 R 2009-2013\u003c\/li\u003e\n\u003cli\u003eYFZ 450 X 2010-2011\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eAttention\u003c\/span\u003e! The included gaskets are specifically developed for Athena cylinder kits. Every time the kit is disassembled, replace the gaskets with the specific Athena set. Do not use OEM gaskets.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Athena Parts","offers":[{"title":"Default Title","offer_id":55590750716289,"sku":"P400485100047","price":687.45,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0860\/6223\/5959\/files\/P400485100047_avif.webp?v=1777543073","url":"https:\/\/motoscoot.net\/en\/products\/cylinder-athena-478cc-yamaha-yzf-450-r-09-25","provider":"Motoscoot","version":"1.0","type":"link"}