{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"339f5d5f16a7","name":"PISTON KIT +5.60mm BIG BORE 72.00mm YAMAHA YZ 2T 250 2003 - 2025 ATHENA S4F07200006B","sku":"56-K156.72.PIB","brand":"Athena","mpn":null,"gtin":null,"condition":"new","inStock":false,"stock":0,"price":{"amount":206.06,"formatted":"£206.06"},"summary":"Athena forged racing piston kit with a bore diameter of 71.96 mm is designed for the Athena Big Bore Cylinder. It is manufactured using a high-performance aluminum alloy with a high silicon content for enhanced strength and reliability, and is CNC-machined for tight tolerances of less than 0.01 mm. The piston's smooth profile promotes optimal flow and flame propagation. Certain models feature a molybdenum disulfide coating on the skirt to reduce friction. The kit includes piston rings with a low-friction design and wear-resistant coatings, piston, pin, and circlips. This piston is intended exclusively for competitive use. Specifications include a big end pin diameter of 18x13x53.5 mm, a compression ratio of 16.0:1, a displacement of 250 cc, a net weight of 0.34 kg, 3 segments, a domed piston head, a biconical piston pin type, and a forged piston type. Cross-reference OEM part numbers include S4F07200006A and S41316257.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"Variant Id","value":"252970"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-K156_2E72_2EPIB/41d958e4b1141131.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-K156_2E72_2EPIB/41d958e4b1141131.jpg"],"description":"Athena forged racing piston kit with a bore diameter of 71.96 mm is designed for the Athena Big Bore Cylinder. It is manufactured using a high-performance aluminum alloy with a high silicon content for enhanced strength and reliability, and is CNC-machined for tight tolerances of less than 0.01 mm. The piston's smooth profile promotes optimal flow and flame propagation. Certain models feature a molybdenum disulfide coating on the skirt to reduce friction. The kit includes piston rings with a low-friction design and wear-resistant coatings, piston, pin, and circlips. This piston is intended exclusively for competitive use. Specifications include a big end pin diameter of 18x13x53.5 mm, a compression ratio of 16.0:1, a displacement of 250 cc, a net weight of 0.34 kg, 3 segments, a domed piston head, a biconical piston pin type, and a forged piston type. Cross-reference OEM part numbers include S4F07200006A and S41316257.","descriptionMarkdown":"### Athena Big Bore Forged Piston Kit for Yamaha YZ 250 2T\n\nEnhance the performance and durability of your Yamaha YZ 250 2T with the Athena Big Bore Forged Piston Kit. This high-performance piston is precision-engineered for competitive use, offering superior strength and reliability.\n\n**Key Features:**\n\n\t\n- Forged Construction: Crafted from a high-performance aluminum alloy with a high silicon content for exceptional strength and longevity.\n\t\n- Precision Machining: CNC machined to tight tolerances of less than 0.01 mm for optimal fit and performance.\n\t\n- Optimized Combustion: Features a smooth piston profile designed to promote efficient flow and flame propagation.\n\t\n- Friction Reduction: Some models include a molybdenum disulfide coating on the skirt to minimize friction.\n\t\n- High-Quality Rings: Equipped with Japanese-made piston rings featuring low-friction design and wear-resistant coatings (PVD or chromium nitride).\n\t\n- Complete Kit: Includes the piston, pin, circlips, and piston rings for a comprehensive upgrade.\n\n**Specifications:**\n\n\t\n- Piston Type: Forged\n\t\n- Bore Diameter: 71.96 mm\n\t\n- Piston Head Type: Domed\n\t\n- Piston Pin Type: Biconical\n\t\n- Number of Segments: 3\n\t\n- Compression Ratio: 16.0:1\n\t\n- Displacement: 250 cc\n\t\n- Big End Pin Diameter: 18x13x53.5 mm\n\t\n- Net Weight: 0.34 kg","weightGrams":null,"fitments":[{"make":"YAMAHA","model":"YZ 250","cc":null,"notes":null,"years":"2003–2021"},{"make":"YAMAHA","model":"YZ 2T 250","cc":null,"notes":null,"years":"2003–2019"}],"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-560mm-big-bore-7200mm-yamaha-yz-2t-250-2003-2025-athena-s4f07200006b","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."]}}