{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"12f592838c37","name":"CYLINDER FULL KIT 102MM YAMAHA YZ 450 10-20, ATHINA S4F102000040 500CC BIG BORE, (Piston included)","sku":"56-K165.102_PIA","brand":"Athena","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":2,"price":{"amount":265.44,"formatted":"£265.44"},"summary":"ATHENA Forged Racing Piston 102mm Bore Diameter. This kit includes the piston, pin, circlips, and piston rings. Piston is forged from a special high-performance aluminum alloy with high silicon content. Piston skirt treated with a molybdenum disulfide coating to reduce friction. Piston rings produced in Japan with wear-resistant coatings (PVD or chromium nitride) to increase durability and fit the cylinder liner. Big End Pin Diameter: 18x10.5x44.5mm. Compression Height: 29.00mm. Compression Ratio: STD. Displacement: 450cc. Net Weight: 0.42kg. Number Of Segments: 3. Piston Pin Type: Standard. Piston Type: Forged. Exclusively for competitive use.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"102mm"},{"label":"Variant Id","value":"253009"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-K165_2E102_5FPIA/fe34c6131898db7f.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-K165_2E102_5FPIA/fe34c6131898db7f.jpg"],"description":"ATHENA Forged Racing Piston 102mm Bore Diameter. This kit includes the piston, pin, circlips, and piston rings. Piston is forged from a special high-performance aluminum alloy with high silicon content. Piston skirt treated with a molybdenum disulfide coating to reduce friction. Piston rings produced in Japan with wear-resistant coatings (PVD or chromium nitride) to increase durability and fit the cylinder liner. Big End Pin Diameter: 18x10.5x44.5mm. Compression Height: 29.00mm. Compression Ratio: STD. Displacement: 450cc. Net Weight: 0.42kg. Number Of Segments: 3. Piston Pin Type: Standard. Piston Type: Forged. Exclusively for competitive use.","descriptionMarkdown":"### Athena 102mm Big Bore Cylinder Kit for Yamaha YZ 450\n\nUpgrade your Yamaha YZ 450's performance with this complete Big Bore Cylinder Kit from Athena. Designed for enthusiasts seeking enhanced power and reliability, this kit features a forged racing piston engineered in Italy for superior strength and durability.\n\nAthena pistons are crafted from a high-performance aluminum alloy with a high silicon content, ensuring exceptional resistance and excellent performance comparable to or exceeding Original Equipment (OE) standards. The cutting-edge CNC machining guarantees precise dimensional tolerances, while the perfectly smooth profile promotes optimal airflow and flame propagation.\n\nFor reduced friction and increased longevity, some pistons feature a molybdenum disulfide coating applied via screen printing. The included piston rings, produced in Japan with wear-resistant coatings (PVD or chromium nitride), further minimize friction and maximize durability. These rings adapt seamlessly to the cylinder liner even under low tangential load.\n\nThis comprehensive kit includes the piston, pin, circlips, and piston rings, all of which are replaceable and interchangeable. Athena products with increased displacement and power beyond road regulations are intended exclusively for competitive use.\n\n#### Key Features:\n\n \n- Forged racing piston with a 101.96mm bore diameter.\n \n- High-performance aluminum alloy with high silicon content for enhanced durability and performance.\n \n- Precise CNC machining for tight dimensional tolerances.\n \n- Smooth piston profile for optimal airflow and flame propagation.\n \n- Includes piston rings made in Japan with wear-resistant coatings for reduced friction and increased longevity.\n \n- Kit includes piston, pin, circlips, and piston rings.\n \n- Engineered in Italy and tested on dynamometer benches and on track for validated performance.\n\n#### Technical Specifications:\n\n \n- Big End Pin Diameter: 18x10,5x44,5 mm\n \n- Bore Diameter: 101.96 mm\n \n- Compression Height: 29.00 mm\n \n- Compression Ratio: STD\n \n- Displacement: 450 cc\n \n- Net Weight: 0.42 Kg\n \n- Number Of Segments: 3\n \n- Piston Pin Type: Standard\n \n- Piston Type: Forged","weightGrams":null,"fitments":[{"make":"YAMAHA","model":"WR 450F","cc":null,"notes":null,"years":"2016–2018"},{"make":"YAMAHA","model":"YZ 450F","cc":null,"notes":null,"years":"2010–2019"},{"make":"YAMAHA","model":"YZ 450FX","cc":null,"notes":null,"years":"2016–2020"},{"make":"YAMAHA","model":"YZF 450","cc":null,"notes":null,"years":"2010–2017"}],"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/cylinder-full-kit-102mm-yamaha-yz-450-10-20-athina-s4f102000040-500cc-big-bore-p","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/12f592838c37:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/12f592838c37:1"}},"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. Every URL is a plain path (no query string) and a GET. Nothing is stored between calls.","checkoutLinkFormat":"https://www.2brosparts.com/api/agent/checkout/GB/{basketKey}:{quantity},{basketKey}:{quantity}","steps":["1. Find products: follow links in these responses, or fetch https://www.2brosparts.com/api/agent/search/GB/{words+joined+with+plus} (e.g. https://www.2brosparts.com/api/agent/search/GB/brake+pads). Every product has a basketKey.","2. Optional check: https://www.2brosparts.com/api/agent/basket/GB/{basketKey}:{quantity},{basketKey}:{quantity} returns stock, totals per delivery option and the checkout link.","3. Give the shopper the checkout link. Opening it fills their basket with exactly these items (replacing what was there) and opens checkout for United Kingdom. They pay on 2brosparts.com through Stripe."],"noFetchNeeded":"You can write the checkout link yourself from basketKeys and quantities; nothing has to be fetched first. 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."]}}