{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"c919bc28039c","name":"PISTON KIT 54MM YAMAHA YZ125/GAS GAS EC125 97-21, ATHENA S4C05400016B STD BORE","sku":"56-K155.54.PKAB","brand":"Athena","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":109.67,"formatted":"£109.67"},"summary":"Piston kit for Athena cylinder, 54mm bore diameter, 125cc displacement. Features a flat piston head type and biconical piston pin type. Constructed from a special high-performance aluminum alloy with high silicon content. Includes piston rings produced in Japan with wear-resistant coatings, offering reduced friction and increased durability. Kit contains piston, pin, circlips, and piston rings. Technical details: Big End Pin Diameter 15x10x45mm, Bore Diameter 53.95mm, Compression Ratio 14.8:1, Net Weight 0.16kg, Number Of Segments 1, Piston Type Melted. Manufactured by Athena. Part Number: S4C05400016B.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"54mm"},{"label":"Variant Id","value":"252962"}],"image":"https://www.oro2u.com/media/catalog/product/s/t/stock51903_1.jpg","images":["https://www.oro2u.com/media/catalog/product/s/t/stock51903_1.jpg"],"description":"Piston kit for Athena cylinder, 54mm bore diameter, 125cc displacement. Features a flat piston head type and biconical piston pin type. Constructed from a special high-performance aluminum alloy with high silicon content. Includes piston rings produced in Japan with wear-resistant coatings, offering reduced friction and increased durability. Kit contains piston, pin, circlips, and piston rings. Technical details: Big End Pin Diameter 15x10x45mm, Bore Diameter 53.95mm, Compression Ratio 14.8:1, Net Weight 0.16kg, Number Of Segments 1, Piston Type Melted. Manufactured by Athena. Part Number: S4C05400016B.","descriptionMarkdown":"### Athena 54mm Piston Kit for Yamaha YZ125 and Gas Gas EC125\n\nUpgrade your motorcycle's performance and reliability with this high-quality cast piston kit from Athena. Engineered for precision and durability, this kit is designed to meet or exceed original equipment standards, offering enhanced resistance and excellent performance for your off-road adventures.\n\nAthena pistons are manufactured using advanced CNC machining tools, ensuring dimensional tolerances of less than 0.01 mm. They are constructed from a special high-performance aluminum alloy with a high silicon content. The 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 extending durability.\n\nDeveloped in Italy by Athena's R&D department, each piston undergoes rigorous testing on engine dynamometer benches and on the track to validate its performance in extreme conditions.\n\nThis piston kit includes the piston, pin, circlips, and piston rings. The piston rings are manufactured in Japan with wear-resistant coatings (PVD or chromium nitride) for increased durability. The rings are designed to adapt perfectly to the cylinder liner, even at low tangential loads, ensuring less friction and higher performance.\n\n**Key Features:**\n\n \n- Piston Diameter: 53.95 mm\n \n- Compression Ratio: 14.8:1\n \n- Piston Type: Cast\n \n- Piston Head Type: Flat\n \n- Piston Pin Type: Biconical\n \n- Includes piston, pin, circlips, and piston rings\n \n- Precision manufactured for optimal fit and performance\n \n- High-performance aluminum alloy with high silicon content\n \n- Molybdenum disulfide coating on some skirts reduces friction\n \n- Piston rings made in Japan with wear-resistant coatings\n \n- Engineered and tested for extreme conditions\n \n- All components are replaceable and interchangeable\n\n_Please note: Products intended for competitive sports use or high-performance applications may not be covered by standard warranty unless a clear faultiness is present._","weightGrams":null,"fitments":[{"make":"GAS-GAS","model":"EC 125","cc":null,"notes":null,"years":"2013–2015"},{"make":"YAMAHA","model":"YZ 125","cc":null,"notes":null,"years":"1997–2019"}],"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-54mm-yamaha-yz125gas-gas-ec125-97-21-athena-s4c05400016b-std-bore","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/c919bc28039c:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/c919bc28039c: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."]}}