{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"02567aa7c23c","name":"PISTON KIT 08-13 YFM250R 74.00, WOSSNER 8724DA YAMAHA ATV, 1S4-11631-20-A0","sku":"56-W4950.A.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":172.51,"formatted":"£172.51"},"summary":"The Wossner 8724DA forged piston kit features a 74.00mm bore and is designed for enhanced strength and heat transfer performance. Manufactured in Germany, this high-compression piston has an elliptical shape to ensure even pressure distribution during thermal expansion, reducing the risk of piston failure. Specifications include a bore of 74.00 mm, actual bore diameter of 73.95 mm, hub stroke of 58.00 mm, clearance of 0.05 mm, compression height of 23.50 mm, dome volume of +2.40 cm³, and a Wossner compression ratio of 12.00:1 compared to the OEM compression ratio of 9.50:1. This kit includes piston, lock, pin, and ring set. Cross-reference OEM part numbers are 1S4-11631-20-A0 and 40078M07400. The part number is 56-W4950.A.WO.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"74mm"},{"label":"Variant Id","value":"256425"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4950_2EA_2EWO/1e7d4429fa353722.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4950_2EA_2EWO/1e7d4429fa353722.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4950_2EA_2EWO/9266f233762b7fe1.jpg"],"description":"The Wossner 8724DA forged piston kit features a 74.00mm bore and is designed for enhanced strength and heat transfer performance. Manufactured in Germany, this high-compression piston has an elliptical shape to ensure even pressure distribution during thermal expansion, reducing the risk of piston failure. Specifications include a bore of 74.00 mm, actual bore diameter of 73.95 mm, hub stroke of 58.00 mm, clearance of 0.05 mm, compression height of 23.50 mm, dome volume of +2.40 cm³, and a Wossner compression ratio of 12.00:1 compared to the OEM compression ratio of 9.50:1. This kit includes piston, lock, pin, and ring set. Cross-reference OEM part numbers are 1S4-11631-20-A0 and 40078M07400. The part number is 56-W4950.A.WO.","descriptionMarkdown":"### Wossner 74.00mm High-Compression Forged Piston Kit\n\nThis Wossner 8724DA forged piston kit features a 74.00mm bore and is engineered for enhanced strength and superior heat transfer performance. Manufactured in Germany, this high-compression piston is designed to optimize engine output and durability.\n\nThe elliptical design of the piston ensures even pressure distribution as the engine heats up. This intelligent design reduces localized stress and significantly lowers the risk of piston failure or collapse, providing a more reliable performance.\n\n#### Key Features:\n\n\t\n- Forged High-Compression Design: Delivers increased strength and improved performance.\n\t\n- Enhanced Heat Transfer: Efficiently transfers heat to cylinder walls for better thermal management.\n\t\n- Elliptical Shape: Promotes uniform pressure distribution during thermal expansion.\n\t\n- Reduced Stress: Minimizes localized stress, preventing piston collapse.\n\t\n- German Manufacturing: Ensures high quality and precision engineering.\n\n#### Specifications:\n\n\t\n- Bore Size: 74.00 mm\n\t\n- Actual Bore Diameter: 73.95 mm\n\t\n- Hub Stroke: 58.00 mm\n\t\n- Piston Clearance: 0.05 mm\n\t\n- Compression Height: 23.50 mm\n\t\n- Dome Volume: +2.40 cm&sup3;\n\t\n- Wossner Compression Ratio: 12.00:1\n\t\n- Original Equipment Manufacturer (OEM) Compression Ratio: 9.50:1","weightGrams":null,"fitments":[{"make":"YAMAHA","model":"XT 250","cc":null,"notes":null,"years":"2013–2020"},{"make":"YAMAHA","model":"YFM R RAPTOR 250","cc":null,"notes":null,"years":"2008–2013"}],"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-08-13-yfm250r-7400-wossner-8724da-yamaha-atv-1s4-11631-20-a0","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/02567aa7c23c:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/02567aa7c23c: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."]}}