{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"d59952273b49","name":"PISTON KIT 04-09 CRF250 HC 78, FORGED WOSSNER 8590DA, 13101-KRN-670","sku":"56-W4852.A.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":182.86,"formatted":"£182.86"},"summary":"Wossner 78.00mm high-compression forged piston kit with a 13.90:1 compression ratio for enhanced engine performance. Engineered for optimal heat transfer, it ensures efficient cooling of the combustion chamber. The elliptical design provides a uniform bearing surface, reducing localized pressure and distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany for precision and reliability. Bore Size: 77.96mm. Displacement: 249 cm&sup3;. Stroke: 52.20mm. Clearance: 0.04mm. Dome Volume: +0.00 cm&sup3;. Compression Height: 19.00mm. Lock Part Number: CW16. Pin Part Number: WP059. Ring Set Part Number: 780XAS. Rod Part Number: P4001. Cross-Reference OEM Part Numbers: 13101-KRN-670. Wossner Part Number: 8590DA.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"78mm"},{"label":"Variant Id","value":"256271"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4852_2EA_2EWO/b3e6eb38952689c5.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4852_2EA_2EWO/b3e6eb38952689c5.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4852_2EA_2EWO/980e34bb376f33b0.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4852_2EA_2EWO/655ee3b4349e4b6e.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4852_2EA_2EWO/86f7f139a40bd321.jpg"],"description":"Wossner 78.00mm high-compression forged piston kit with a 13.90:1 compression ratio for enhanced engine performance. Engineered for optimal heat transfer, it ensures efficient cooling of the combustion chamber. The elliptical design provides a uniform bearing surface, reducing localized pressure and distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany for precision and reliability. Bore Size: 77.96mm. Displacement: 249 cm&sup3;. Stroke: 52.20mm. Clearance: 0.04mm. Dome Volume: +0.00 cm&sup3;. Compression Height: 19.00mm. Lock Part Number: CW16. Pin Part Number: WP059. Ring Set Part Number: 780XAS. Rod Part Number: P4001. Cross-Reference OEM Part Numbers: 13101-KRN-670. Wossner Part Number: 8590DA.","descriptionMarkdown":"### Wossner High-Compression Forged Piston Kit - 78.00mm\n\nUpgrade your engine's performance with this Wossner high-compression forged piston kit. Engineered for durability and optimal power output, this piston kit is designed to meet the demands of high-performance riding.\n\n**Key Features:**\n\n \n- High Compression Design: Delivers increased engine power and responsiveness.\n \n- Forged Construction: Provides superior strength, durability, and resistance to extreme pressures and temperatures.\n \n- Optimized Heat Transfer: Features an advanced design for efficient cooling of the combustion chamber, ensuring consistent performance.\n \n- Elliptical Design: Promotes a uniform bearing surface, which reduces localized pressure and distributes thrust loads evenly to prevent piston collapse.\n \n- Precision Manufacturing: Made in Germany to exacting standards for reliability and a perfect fit.\n\n**Specifications:**\n\n \n- Bore Size: 78.00mm\n \n- Actual Bore Diameter: 77.96mm\n \n- Displacement: 249 cm&sup3;\n \n- Stroke: 52.20mm\n \n- Clearance: 0.04mm\n \n- Wossner Compression Ratio: 13.90:1\n \n- OEM Compression Ratio: 12.90:1\n \n- Dome Volume: +0.00 cm&sup3;\n \n- Compression Height: 19.00mm\n \n- Lock Part Number: CW16\n \n- Pin Part Number: WP059\n \n- Ring Set Part Number: 780XAS\n \n- Rod Part Number: P4001 (2010 - Current)\n\n**Cross-Reference OEM Part Numbers:**\n\n \n- 13101-KRN-670\n \n- Wossner Part No: 8590DA","weightGrams":null,"fitments":[{"make":"HONDA","model":"CRF 250R","cc":null,"notes":null,"years":"2004–2009"},{"make":"HONDA","model":"CRF 250X","cc":null,"notes":null,"years":"2004–2017"}],"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-04-09-crf250-hc-78-forged-wossner-8590da-13101-krn-670","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/d59952273b49:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/d59952273b49:1"}},"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."]}}