{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"ed9d2a123123","name":"PISTON KIT A 77MM YAMAHA WR/YZ 250 16-22, ATHENA S5F07700009A","sku":"56-W4966.A.ATH","brand":"Athena","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":166.55,"formatted":"£166.55"},"summary":"ATHENA Forged Piston Ø 76.95 mm. Made with a special high-performance aluminum alloy with high silicon content and cutting-edge CNC machining. Some pistons feature a molybdenum disulfide coating applied by screen printing to reduce friction. Piston rings are produced in Japan with wear-resistant coatings. This kit contains the piston, pin, circlips, and piston rings. Big End Pin Diameter: 16x9.5x38 mm. Bore Diameter: 76.95 mm. Compression Height: 20.20 mm. Compression Ratio: 13.5:1. Displacement: 250 cc. Net Weight: 0.18 Kg. Number Of Segments: 2. Piston Pin Type: Standard. Piston Type: Forged.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"77mm"},{"label":"Variant Id","value":"301961"}],"image":"https://www.oro2u.com/media/catalog/product/s/t/stock106383_1.jpg","images":["https://www.oro2u.com/media/catalog/product/s/t/stock106383_1.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock106383_2.jpg"],"description":"ATHENA Forged Piston Ø 76.95 mm. Made with a special high-performance aluminum alloy with high silicon content and cutting-edge CNC machining. Some pistons feature a molybdenum disulfide coating applied by screen printing to reduce friction. Piston rings are produced in Japan with wear-resistant coatings. This kit contains the piston, pin, circlips, and piston rings. Big End Pin Diameter: 16x9.5x38 mm. Bore Diameter: 76.95 mm. Compression Height: 20.20 mm. Compression Ratio: 13.5:1. Displacement: 250 cc. Net Weight: 0.18 Kg. Number Of Segments: 2. Piston Pin Type: Standard. Piston Type: Forged.","descriptionMarkdown":"### Athena Forged Piston Kit for Yamaha WR/YZ 250\n\nEnhance the performance and durability of your motorcycle with the Athena Forged Piston Kit. Crafted using advanced reverse extrusion and cutting-edge CNC machining, this piston boasts dimensional tolerances of less than 0.01 mm. It is constructed from a special high-performance aluminum alloy with a high silicon content, ensuring reliability comparable to Original Equipment (OE) pistons while offering superior resistance and excellent performance.\n\nThe piston features a perfectly smooth profile designed for regular flow and optimal flame propagation. Some piston skirts are treated with a molybdenum disulfide coating, applied through screen printing, to further reduce friction, boost performance, and extend durability. Each piston is engineered in Italy and rigorously tested on dynamometer benches and on the track to validate performance in extreme conditions.\n\nThis piston kit includes the piston, pin, circlips, and piston rings. The piston rings, produced in Japan with wear-resistant coatings such as PVD or chromium nitride, minimize friction with the cylinder, leading to higher performance and increased longevity. The rings are designed to adapt perfectly to the cylinder liner even at low tangential loads.\n\n**Key Features:**\n\n \n- Piston Type: Forged\n \n- Bore Diameter: 76.95 mm\n \n- Compression Height: 20.20 mm\n \n- Compression Ratio: 13.5:1\n \n- Number Of Segments: 2\n \n- Piston Pin Type: Standard\n \n- Big End Pin Diameter: 16x9.5x38 mm\n \n- Displacement: 250 cc\n \n- Net Weight: 0.18 Kg\n\n**Note:** Products intended for competitive sports use or high-performance applications may not be covered by the standard guarantee unless a clear faultiness is present.","weightGrams":null,"fitments":[{"make":"YAMAHA","model":"WR 250F","cc":null,"notes":null,"years":"2018–2019"},{"make":"YAMAHA","model":"WRF 250","cc":null,"notes":null,"years":"2018–2019"},{"make":"YAMAHA","model":"YZ 250F","cc":null,"notes":null,"years":"2016–2018"},{"make":"YAMAHA","model":"YZ 250FX","cc":null,"notes":null,"years":"2017–2019"},{"make":"YAMAHA","model":"YZF 250","cc":null,"notes":null,"years":"2016–2018"},{"make":"YAMAHA","model":"YZF X 250","cc":null,"notes":null,"years":"2017–2018"}],"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-77mm-yamaha-wryz-250-16-22-athena-s5f07700009a","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/ed9d2a123123:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/ed9d2a123123:1"}},"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."]}}