{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"d9347710cacb","name":"PISTON KIT A 98MM YAMAHA YFZ 450 04-13, ATHENA S4F09800004A 478CC BIG BORE, KIT A","sku":"56-K172.98.PKA","brand":"Athena","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":223.7,"formatted":"£223.70"},"summary":"Forged racing piston kit for Athena Big Bore cylinder. Bore diameter 97.94 mm. Compression ratio 12.4:1. Displacement 450cc. Net weight 0.41 Kg. Three segments. Standard piston pin type. Special high-performance aluminum alloy with high silicon content. Molybdenum disulfide coating on some piston skirts reduces friction. Piston rings produced in Japan with wear-resistant coatings (PVD or chromium nitride). Kit includes piston, pin, circlips, and piston rings. Big End Pin Diameter: 20x12x50 mm. Manufacturer: Athena.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"98mm"},{"label":"Variant Id","value":"253042"}],"image":"https://www.oro2u.com/media/catalog/product/s/t/stock51983_1.jpg","images":["https://www.oro2u.com/media/catalog/product/s/t/stock51983_1.jpg"],"description":"Forged racing piston kit for Athena Big Bore cylinder. Bore diameter 97.94 mm. Compression ratio 12.4:1. Displacement 450cc. Net weight 0.41 Kg. Three segments. Standard piston pin type. Special high-performance aluminum alloy with high silicon content. Molybdenum disulfide coating on some piston skirts reduces friction. Piston rings produced in Japan with wear-resistant coatings (PVD or chromium nitride). Kit includes piston, pin, circlips, and piston rings. Big End Pin Diameter: 20x12x50 mm. Manufacturer: Athena.","descriptionMarkdown":"### Athena Forged Racing Piston Kit - Big Bore Upgrade\n\nEnhance the performance and reliability of your engine with this premium Athena Forged Racing Piston Kit. Engineered with cutting-edge technology and high-quality materials, this kit is designed to deliver superior power and durability.\n\nAthena, a leader in motorcycle spare parts for over 40 years, utilizes advanced reverse extrusion methods and state-of-the-art CNC machining to produce pistons with exceptional dimensional accuracy, ensuring tolerances of less than 0.01 mm. Constructed from a special high-performance aluminum alloy with a high silicon content, these pistons offer the reliability of original equipment while providing increased resistance and outstanding performance.\n\nThe pistons feature a perfectly smooth profile designed for optimal airflow and efficient flame propagation. Some piston skirts are further enhanced with a molybdenum disulfide coating applied via screen printing, significantly reducing friction to boost both performance and longevity.\n\nEvery Athena piston is meticulously engineered by their R&D department in Italy. Each unit undergoes rigorous testing on engine dynamometer benches under progressive stress loads and is validated on track in extreme conditions to guarantee performance and unwavering reliability.\n\nThis specific piston kit is designed for Athena Big Bore cylinder kits and includes high-quality piston rings manufactured in Japan with wear-resistant coatings (PVD or chromium nitride). These rings ensure minimal friction against the cylinder walls, leading to higher performance and increased durability. They are designed to perfectly adapt to the cylinder liner even under low tangential load.\n\n**Key Features:**\n\n \n- Forged piston construction for superior strength and performance.\n \n- Special high-performance aluminum alloy with high silicon content.\n \n- Ultra-precise CNC machining for tight tolerances (less than 0.01 mm).\n \n- Optimized profile for smooth airflow and effective flame propagation.\n \n- Optional molybdenum disulfide coating on skirts to reduce friction.\n \n- High-quality piston rings made in Japan with wear-resistant coatings.\n \n- Designed for Athena Big Bore cylinder kits.\n \n- Kit includes piston, pin, circlips, and piston rings.\n \n- All components are replaceable and interchangeable.\n\n**Technical Specifications:**\n\n \n- Bore Diameter: 97.94 mm\n \n- Compression Ratio: 12.4:1\n \n- Displacement: 450 cc\n \n- Number Of Segments: 3\n \n- Piston Pin Type: Standard\n \n- Piston Type: Forged\n \n- Big End Pin Diameter: 20x12x50 mm\n \n- Net Weight: 0.41 Kg\n\n_Please note: Products designed for increased displacement and power beyond standard road regulations are intended exclusively for competitive use. Athena disclaims all responsibility for any use contrary to national regulations. Guarantees may not apply to products used in competitive sports or high-performance applications unless a clear faultiness is present._","weightGrams":null,"fitments":[{"make":"YAMAHA","model":"YFZ 450 Bill Balance Edition","cc":null,"notes":null,"years":"2010"},{"make":"YAMAHA","model":"YFZ 450R","cc":null,"notes":null,"years":"2009–2017"},{"make":"YAMAHA","model":"YFZ 450R Special Edition","cc":null,"notes":null,"years":"2010–2013"},{"make":"YAMAHA","model":"YFZ 450S","cc":null,"notes":null,"years":"2004–2011"},{"make":"YAMAHA","model":"YFZ 450X","cc":null,"notes":null,"years":"2010–2011"},{"make":"YAMAHA","model":"YFZ 450X Special Edition","cc":null,"notes":null,"years":"2011"},{"make":"YAMAHA","model":"YFZ BILL BALANCE EDITION 450","cc":null,"notes":null,"years":"2010"},{"make":"YAMAHA","model":"YFZ R 450","cc":null,"notes":null,"years":"2009–2017"},{"make":"YAMAHA","model":"YFZ S 450","cc":null,"notes":null,"years":"2004–2013"},{"make":"YAMAHA","model":"YFZ X 450","cc":null,"notes":null,"years":"2010–2021"}],"collections":[{"name":"Engine","url":"https://www.2brosparts.com/api/agent/collection/GB/engine"},{"name":"Pistons & Kits","url":"https://www.2brosparts.com/api/agent/collection/GB/pistons-kits"}],"links":{"page":"https://www.2brosparts.com/products/piston-kit-a-98mm-yamaha-yfz-450-04-13-athena-s4f09800004a-478cc-big-bore-kit-a","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/d9347710cacb:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/d9347710cacb:1"}},"market":{"country":"GB","countryName":"United Kingdom","locale":"en-gb","currency":"GBP","exchangeRateFromGbp":1,"pricesIncludeUkVat":true,"checkoutTax":null,"delivery":[{"name":"Standard","description":"Orders £15.00–£59.99 · 2–4 business days","carrier":null,"estimatedDays":"2–4 business days","price":{"amount":4.99,"formatted":"£4.99"},"free":false,"minimumOrder":{"amount":0,"formatted":"£0.00","gbp":0},"weightGrams":null},{"name":"Standard","description":"Orders £60.00 and up · 2–4 business days","carrier":null,"estimatedDays":"2–4 business days","price":{"amount":0,"formatted":"£0.00"},"free":true,"minimumOrder":{"amount":60,"formatted":"£60.00","gbp":60},"weightGrams":null}],"storeUrl":"https://www.2brosparts.com"},"navigate":{"start":"https://www.2brosparts.com/api/agent","search":"https://www.2brosparts.com/api/agent/search/GB/{words+joined+with+plus}"},"howToBuy":{"summary":"Build a basket for the shopper and give them one checkout link. 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Each product also has links.buyOneNow, a ready link for one unit.","stateless":"Nothing is saved on our side. The items part of the URL is the whole basket: to change it, write the link again with the new list.","itemsFormat":"basketKey:quantity pairs joined by commas, e.g. 04f24aad4d68:2,7c1e9a0b3f2d:1. Quantity defaults to 1. Up to 50 products, 100 each.","country":"GB is the shopper's delivery country. Swap it for theirs (US, DE, FR…) in any URL; currency, tax and delivery follow it.","tips":["Put everything the shopper wants in one link.","Optionally add your name as a last path segment on checkout links (…/checkout/GB/<items>/claude) so the sale is credited to you.","The checkout link is for the shopper's browser. Do not open it yourself.","Signed-in trade account holders see their trade prices at checkout."]}}