{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"a0a7766ebfbd","name":"PISTON KIT 01-04 YZF250 79.00, FORGED WOSSER 8559D200 3-RING","sku":"56-W4738+200.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":2,"price":{"amount":182.86,"formatted":"£182.86"},"summary":"Wossner 79mm Bore Piston Kit PN# 8559D200. This forged piston offers superior strength and heat transfer efficiency, ensuring optimal performance and durability. Its elliptical design provides a uniform bearing surface under heat expansion, reducing localized pressure and distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany, this piston meets OEM compression standards. Features include a high-strength forged piston for durability and performance, optimized heat transfer to cylinder walls, and an elliptical design that prevents piston collapse and ensures even load distribution. Specifications: Bore 79mm, actual diameter 78.96mm, Display (cm³) 249, Stroke (mm) 53.6, Clearance (mm) 0.04, Compression Ratio OEM, OEM Compression Ratio 12.50:1, Dome Volume (cm³) -4.70, Compression Height (mm) 22.20. Includes 3 piston rings. Cross-Reference OEM Part Numbers: Lock CW16, Pin WP059, Ring Set 790XAS-2.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"79mm"},{"label":"Variant Id","value":"256019"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4738_2B200_2EWO/f5a0d343e2da2b4d.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4738_2B200_2EWO/f5a0d343e2da2b4d.jpg"],"description":"Wossner 79mm Bore Piston Kit PN# 8559D200. This forged piston offers superior strength and heat transfer efficiency, ensuring optimal performance and durability. Its elliptical design provides a uniform bearing surface under heat expansion, reducing localized pressure and distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany, this piston meets OEM compression standards. Features include a high-strength forged piston for durability and performance, optimized heat transfer to cylinder walls, and an elliptical design that prevents piston collapse and ensures even load distribution. Specifications: Bore 79mm, actual diameter 78.96mm, Display (cm³) 249, Stroke (mm) 53.6, Clearance (mm) 0.04, Compression Ratio OEM, OEM Compression Ratio 12.50:1, Dome Volume (cm³) -4.70, Compression Height (mm) 22.20. Includes 3 piston rings. Cross-Reference OEM Part Numbers: Lock CW16, Pin WP059, Ring Set 790XAS-2.","descriptionMarkdown":"### Wossner Forged Piston Kit for Yamaha YZF250\n\nUpgrade your motorcycle's performance and durability with the Wossner 79mm Bore Piston Kit. This high-strength forged piston is engineered for optimal power delivery and longevity, manufactured to meet OEM compression standards. Its advanced elliptical design ensures uniform bearing surfaces, even under extreme heat, effectively preventing piston collapse by distributing thrust loads evenly.\n\n#### Key Features:\n\n\t\n- Forged Construction: Provides superior strength and resistance to high temperatures and pressures.\n\t\n- Optimized Heat Transfer: Efficiently transfers heat to cylinder walls for improved performance and reduced wear.\n\t\n- Elliptical Design: Ensures even load distribution and prevents piston collapse under thermal expansion.\n\t\n- OEM Compression Ratio: Designed to match original equipment specifications for seamless integration.\n\t\n- 3-Ring Design: Includes a complete set of three piston rings for optimal sealing and performance.\n\t\n- German Engineering: Manufactured in Germany, ensuring high quality and precision.\n\n#### Specifications:\n\n\t\n- Bore Size: 79mm\n\t\n- Actual Piston Diameter: 78.96mm\n\t\n- Engine Displacement (cm³): 249\n\t\n- Stroke (mm): 53.6\n\t\n- Piston Clearance (mm): 0.04\n\t\n- Compression Ratio: OEM\n\t\n- OEM Compression Ratio: 12.50:1\n\t\n- Dome Volume (cm³): -4.70\n\t\n- Compression Height (mm): 22.20","weightGrams":null,"fitments":[],"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-01-04-yzf250-7900-forged-wosser-8559d200-3-ring","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/a0a7766ebfbd:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/a0a7766ebfbd: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."]}}