{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"9df543a75a11","name":"PISTON KIT B 77MM YAMAHA YZ 250F 14-15, ATHENA S5F07700008B","sku":"56-W4961.B.ATH","brand":"Athena","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":2,"price":{"amount":166.55,"formatted":"£166.55"},"summary":"ATHENA Forged Piston Kit B, 77mm Bore Diameter (76.97 mm). This piston is made from a special high-performance aluminum alloy with high silicon content and is produced using cutting-edge CNC machining tools ensuring dimensional tolerances of less than 0.01 mm. Some piston skirts are treated with a molybdenum disulfide coating applied by screen printing to reduce friction. The piston rings are produced in Japan with wear-resistant coatings to increase retention and durability. This kit contains the piston, pin, circlips, and piston rings. Technical features include: Big End Pin Diameter 16x10x42 mm, Compression Height 20.40 mm, Compression Ratio 13.5:1, Displacement 250 cc, Net Weight 0.20 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":"289767"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4961_2EB_2EATH/7b1d0125d9350963.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4961_2EB_2EATH/7b1d0125d9350963.jpg"],"description":"ATHENA Forged Piston Kit B, 77mm Bore Diameter (76.97 mm). This piston is made from a special high-performance aluminum alloy with high silicon content and is produced using cutting-edge CNC machining tools ensuring dimensional tolerances of less than 0.01 mm. Some piston skirts are treated with a molybdenum disulfide coating applied by screen printing to reduce friction. The piston rings are produced in Japan with wear-resistant coatings to increase retention and durability. This kit contains the piston, pin, circlips, and piston rings. Technical features include: Big End Pin Diameter 16x10x42 mm, Compression Height 20.40 mm, Compression Ratio 13.5:1, Displacement 250 cc, Net Weight 0.20 Kg, Number Of Segments 2, Piston Pin Type Standard, Piston Type Forged.","descriptionMarkdown":"### Athena Forged Piston Kit B - 77mm Bore\n\n Enhance the performance and durability of your motorcycle with the Athena Forged Piston Kit B. Crafted from a special high-performance aluminum alloy with a high silicon content, these pistons are designed to meet or exceed Original Equipment (OE) standards, offering greater resistance and excellent performance for off-road applications.\n\n Produced using cutting-edge CNC machining tools, Athena pistons achieve dimensional tolerances of less than 0.01 mm. The perfectly smooth piston profile promotes regular flow and optimal flame propagation. Some piston skirts feature a molybdenum disulfide coating applied via screen printing to further reduce friction, boosting performance and longevity.\n\n Every Athena piston is engineered in Italy and rigorously tested on engine dynamometer benches and on the track to validate performance under extreme conditions. This piston kit includes the piston, pin, circlips, and piston rings. The piston rings are produced in Japan with wear-resistant coatings (PVD or chromium nitride) for increased retention and durability, ensuring they adapt perfectly to the cylinder liner even at low tangential loads.\n\n**Key Features:**\n\n \n- Forged piston for superior strength and performance.\n \n- High silicon aluminum alloy for enhanced reliability and resistance.\n \n- Precision CNC machining for tight tolerances (less than 0.01 mm).\n \n- Smooth profile for improved airflow and flame propagation.\n \n- Optional molybdenum disulfide coating on some skirts to reduce friction.\n \n- Includes piston, pin, circlips, and piston rings.\n \n- High-quality piston rings with wear-resistant coatings.\n \n- Designed and tested by Athena R&D for extreme conditions.\n\n**Technical Specifications:**\n\n \n- Big End Pin Diameter: 16x10x42 mm\n \n- Bore Diameter: 76.97 mm\n \n- Compression Height: 20.40 mm\n \n- Compression Ratio: 13.5:1\n \n- Displacement: 250 cc\n \n- Net Weight: 0.20 kg\n \n- Number of Segments: 2\n \n- Piston Pin Type: Standard\n \n- Piston Type: Forged","weightGrams":null,"fitments":[{"make":"YAMAHA","model":"WR 250F","cc":null,"notes":null,"years":"2015–2019"},{"make":"YAMAHA","model":"WRF 250","cc":null,"notes":null,"years":"2014–2018"},{"make":"YAMAHA","model":"YZ 250F","cc":null,"notes":null,"years":"2014–2018"},{"make":"YAMAHA","model":"YZ 250FX","cc":null,"notes":null,"years":"2014–2019"},{"make":"YAMAHA","model":"YZF 250","cc":null,"notes":null,"years":"2014–2015"},{"make":"YAMAHA","model":"YZF X 250","cc":null,"notes":null,"years":"2014–2019"}],"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-b-77mm-yamaha-yz-250f-14-15-athena-s5f07700008b","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/9df543a75a11:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/9df543a75a11:1"}},"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."]}}