{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"a4bcf05cf733","name":"PISTON KIT 05-07 YZF250 77mm, WOSSNER 8614DA 3-RING, 5NL-11631-20-00","sku":"56-W189+00A.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":182.86,"formatted":"£182.86"},"summary":"Wossner forged piston kit with a 77mm bore. This three-ring piston is engineered for optimal combustion chamber heat transfer and uniform bearing surface under heat expansion, reducing localized pressure and piston collapse. Manufactured in Germany for durability and precision. Features include forged piston for superior strength and design, three-ring design for enhanced sealing and durability, optimized heat transfer to cylinder walls, and elliptical design for uniform bearing surface and even thrust load distribution. Specifications include a 77mm bore, standard size piston (PN# 8614DA), lock part number CW16, pin part number WP070, ring set part number 770XAS, displacement of 249 cm³, stroke of 53.6mm, clearance of 0.04mm, OEM compression ratio of 12.50:1, dome volume of -4.50 cm³, and compression height of 22.20mm. Cross-reference OEM part number: 5NL-11631-20-00.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"77mm"},{"label":"Variant Id","value":"254920"}],"image":"https://www.oro2u.com/media/catalog/product/s/t/stock53866_1.jpg","images":["https://www.oro2u.com/media/catalog/product/s/t/stock53866_1.jpg"],"description":"Wossner forged piston kit with a 77mm bore. This three-ring piston is engineered for optimal combustion chamber heat transfer and uniform bearing surface under heat expansion, reducing localized pressure and piston collapse. Manufactured in Germany for durability and precision. Features include forged piston for superior strength and design, three-ring design for enhanced sealing and durability, optimized heat transfer to cylinder walls, and elliptical design for uniform bearing surface and even thrust load distribution. Specifications include a 77mm bore, standard size piston (PN# 8614DA), lock part number CW16, pin part number WP070, ring set part number 770XAS, displacement of 249 cm³, stroke of 53.6mm, clearance of 0.04mm, OEM compression ratio of 12.50:1, dome volume of -4.50 cm³, and compression height of 22.20mm. Cross-reference OEM part number: 5NL-11631-20-00.","descriptionMarkdown":"### Wossner 77mm Forged Piston Kit\n\nThis Wossner forged piston kit features a 77mm bore and a three-ring design, engineered for superior strength, durability, and optimal performance. Manufactured in Germany, this piston is designed for enhanced combustion chamber heat transfer and maintains a uniform bearing surface under heat expansion, which reduces localized pressure and prevents piston collapse. The advanced elliptical design ensures even thrust load distribution for a longer lifespan.\n\n**Key Features:**\n\n\t\n- Forged piston construction for exceptional strength and resilience.\n\t\n- Three-ring configuration for improved sealing and extended durability.\n\t\n- Engineered for efficient heat transfer to the cylinder walls.\n\t\n- Elliptical shape provides a uniform bearing surface and balanced thrust load.\n\t\n- Precision manufactured in Germany.\n\n**Specifications:**\n\n\t\n- Bore Size: 77mm\n\t\n- Piston Part Number: 8614DA\n\t\n- Ring Set Part Number: 770XAS\n\t\n- Lock Part Number: CW16\n\t\n- Pin Part Number: WP070\n\t\n- Displacement: 249 cm&sup3;\n\t\n- Stroke: 53.6mm\n\t\n- Clearance: 0.04mm\n\t\n- Compression Height: 22.20mm\n\t\n- Dome Volume: -4.50 cm&sup3;\n\t\n- Wossner Compression Ratio: OEM\n\t\n- OEM Compression Ratio: 12.50:1\n\n**Cross-Reference OEM Part Number:**\n\n\t\n- 5NL-11631-20-00","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-05-07-yzf250-77mm-wossner-8614da-3-ring-5nl-11631-20-00","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/a4bcf05cf733:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/a4bcf05cf733:1"}},"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."]}}