{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"de4b23fc2913","name":"PISTON KIT 58mm YAMAHA YZ 125 97-26, ATHENA S4C05800003B 144CC BIG BORE","sku":"56-K132.58.PIB","brand":"Athena","mpn":null,"gtin":null,"condition":"new","inStock":false,"stock":0,"price":{"amount":145.7,"formatted":"£145.70"},"summary":"ATHENA Cast Piston Kit Ø 57.95 mm for Athena Big Bore Cylinder Kit S4C05800003B. This 144cc big bore piston kit from Athena is manufactured with cutting-edge CNC machining tools, ensuring dimensional tolerances of less than 0.01 mm. Made from a special high-performance aluminum alloy with high silicon content, it offers the reliability of OE pistons with greater resistance and excellent performance. The perfectly smooth profile ensures regular flow and perfect flame propagation. Some piston skirts are treated with a molybdenum disulfide coating applied by screen printing to reduce friction and enhance performance and durability. Athena engineers provide advanced technical solutions and high-quality standards equal to or better than OE production for performance and reliability. Each piston is engineered in Italy by Athena R&D and tested on engine dynamometer benches and on track. The piston for Athena Big Bore cylinder is equipped with piston rings that guarantee less friction with the cylinder for higher performance. The rings, produced in Japan with wear-resistant coatings (PVD or chromium nitride), increase retention and durability and adapt perfectly to the cylinder liner. This piston kit contains the piston, pin, circlips, and piston rings. All components are replaceable and interchangeable. Big End Pin Diameter: 15x10x45 mm, Bore Diameter: 57.95 mm, Displacement: 125 cc, Net Weight: 0.18 Kg, Number Of Segments: 1, Piston Head Type: Flat, Piston Pin Type: Biconical, Piston Type: Melted.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"Variant Id","value":"252804"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-K132_2E58_2EPIB/b66b9678f21b5f0e.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-K132_2E58_2EPIB/b66b9678f21b5f0e.jpg"],"description":"ATHENA Cast Piston Kit Ø 57.95 mm for Athena Big Bore Cylinder Kit S4C05800003B. This 144cc big bore piston kit from Athena is manufactured with cutting-edge CNC machining tools, ensuring dimensional tolerances of less than 0.01 mm. Made from a special high-performance aluminum alloy with high silicon content, it offers the reliability of OE pistons with greater resistance and excellent performance. The perfectly smooth profile ensures regular flow and perfect flame propagation. Some piston skirts are treated with a molybdenum disulfide coating applied by screen printing to reduce friction and enhance performance and durability. Athena engineers provide advanced technical solutions and high-quality standards equal to or better than OE production for performance and reliability. Each piston is engineered in Italy by Athena R&D and tested on engine dynamometer benches and on track. The piston for Athena Big Bore cylinder is equipped with piston rings that guarantee less friction with the cylinder for higher performance. The rings, produced in Japan with wear-resistant coatings (PVD or chromium nitride), increase retention and durability and adapt perfectly to the cylinder liner. This piston kit contains the piston, pin, circlips, and piston rings. All components are replaceable and interchangeable. Big End Pin Diameter: 15x10x45 mm, Bore Diameter: 57.95 mm, Displacement: 125 cc, Net Weight: 0.18 Kg, Number Of Segments: 1, Piston Head Type: Flat, Piston Pin Type: Biconical, Piston Type: Melted.","descriptionMarkdown":"### Athena Cast Piston Kit - 58mm Bore for Big Bore Cylinder\n\nEnhance the performance of your motorcycle with this Athena Cast Piston Kit. Designed for big bore cylinder applications, this kit is crafted with cutting-edge CNC machining to ensure precise dimensional tolerances. Made from a special high-performance aluminum alloy with a high silicon content, these pistons offer the reliability of OE parts with improved resistance and excellent performance.\n\nThe piston features a smooth profile for optimized airflow and flame propagation. Some piston skirts are treated with a molybdenum disulfide coating to further reduce friction, boosting performance and durability.\n\nAthena engineers employ advanced technical solutions and maintain the highest quality standards, comparable to or exceeding OE production, ensuring both performance and reliability. Each piston is meticulously engineered and tested on dynamometer benches and on the track to validate performance under extreme conditions.\n\nThis piston kit includes the piston, pin, circlips, and piston rings. All components are designed to be replaceable and interchangeable.\n\n#### Key Features:\n\n \n- Material: High-performance aluminum alloy with high silicon content.\n \n- Manufacturing: Precision CNC machined for tolerances less than 0.01 mm.\n \n- Friction Reduction: Some models feature a molybdenum disulfide coating.\n \n- Piston Rings: Produced in Japan with wear-resistant coatings (PVD or chromium nitride) for increased durability.\n \n- Included Components: Piston, pin, circlips, and piston rings.\n \n- Piston Head Type: Flat\n \n- Piston Type: Melted\n \n- Piston Pin Type: Biconical\n \n- Big End Pin Diameter: 15x10x45 mm\n \n- Bore Diameter: 57.95 mm\n \n- Weight: 0.18 Kg (Net)\n \n- Number Of Segments: 1\n\n**Note:** Products designed for displacements and power exceeding road code regulations are intended exclusively for competitive use. Athena assumes no responsibility for any use contrary to national regulations.","weightGrams":null,"fitments":[{"make":"YAMAHA","model":"YZ 125","cc":null,"notes":null,"years":"1997–2021"}],"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-58mm-yamaha-yz-125-97-26-athena-s4c05800003b-144cc-big-bore","buyOneNow":null,"basketWithThis":null}},"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."]}}