{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"b87d417cc80c","name":"PISTON KIT 05-07 YZF250 77.00, WOSSNER 8612DA 2-RING, 5NL-11631-20-00","sku":"56-W188.A.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":182.4,"formatted":"£182.40"},"summary":"Wossner forged piston kit with a 77mm bore, 2-ring design, and standard size. This 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. Specifications include a 77mm bore, lock part number CW16, pin part number WP059, ring set part number 770XAS-2, 249 cm³ displacement, 53.6mm stroke, 0.04mm clearance, OEM compression ratio of 12.50:1, -2.80 cm³ dome volume, and 22.20mm compression height. Cross-reference OEM part numbers include 5NL-11631-20-00 and 5XC-11631-00-00.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"77mm"},{"label":"Variant Id","value":"254909"}],"image":"https://www.oro2u.com/media/catalog/product/s/t/stock53855_1.jpg","images":["https://www.oro2u.com/media/catalog/product/s/t/stock53855_1.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock53855_2.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock53855_3.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock53855_4.jpg"],"description":"Wossner forged piston kit with a 77mm bore, 2-ring design, and standard size. This 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. Specifications include a 77mm bore, lock part number CW16, pin part number WP059, ring set part number 770XAS-2, 249 cm³ displacement, 53.6mm stroke, 0.04mm clearance, OEM compression ratio of 12.50:1, -2.80 cm³ dome volume, and 22.20mm compression height. Cross-reference OEM part numbers include 5NL-11631-20-00 and 5XC-11631-00-00.","descriptionMarkdown":"### Wossner 77mm Forged Piston Kit for Yamaha and Gas Gas Off-Road Motorcycles\n\nEnhance the performance and durability of your off-road motorcycle with this Wossner forged piston kit. Engineered with precision in Germany, this kit features a 77mm bore and a two-ring design for optimal combustion and longevity.\n\n**Key Features:**\n\n\t\n- Forged Piston: Provides superior strength and a robust design capable of withstanding demanding riding conditions.\n\t\n- Two-Ring Design: Optimized for enhanced performance and extended durability.\n\t\n- Advanced Heat Transfer: Engineered for efficient heat transfer to cylinder walls, promoting consistent operating temperatures.\n\t\n- Uniform Bearing Surface: Features an elliptical design that ensures a uniform bearing surface under heat expansion, reducing localized pressure and preventing piston collapse for even thrust load distribution.\n\t\n- German Manufacturing: Built to exacting standards in Germany, guaranteeing high quality and precision.\n\n**Specifications:**\n\n\t\n- Bore Size: 77.00mm\n\t\n- Piston Type: Standard Size (PN# 8612DA)\n\t\n- Lock Part Number: CW16\n\t\n- Pin Part Number: WP059\n\t\n- Ring Set Part Number: 770XAS-2\n\t\n- Engine Displacement: 249 cm&sup3;\n\t\n- Stroke: 53.6mm\n\t\n- Piston Clearance: 0.04mm\n\t\n- Dome Volume: -2.80 cm&sup3;\n\t\n- Compression Height: 22.20mm\n\t\n- Wossner Compression Ratio: OEM\n\t\n- OEM Compression Ratio: 12.50:1\n\n**Cross-Reference OEM Part Numbers:**\n\n\t\n- 5NL-11631-20-00\n\t\n- 5XC-11631-00-00","weightGrams":null,"fitments":[{"make":"GAS-GAS","model":"EC F 250","cc":null,"notes":null,"years":"2010–2015"},{"make":"YAMAHA","model":"WR 250F","cc":null,"notes":null,"years":"2001–2013"},{"make":"YAMAHA","model":"WRF 250","cc":null,"notes":null,"years":"2001–2013"},{"make":"YAMAHA","model":"YZ 250F","cc":null,"notes":null,"years":"2001–2007"},{"make":"YAMAHA","model":"YZF 250","cc":null,"notes":null,"years":"2001–2007"}],"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-yzf250-7700-wossner-8612da-2-ring-5nl-11631-20-00","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/b87d417cc80c:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/b87d417cc80c: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."]}}