{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"c3bd0a64fa32","name":"PISTON KIT 08-09 WR250X 77 HC, FORGED WOSSNER 8772DA","sku":"56-W239.A.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":146.8,"formatted":"£146.80"},"summary":"Wossner forged Pro Series piston kit with a 77.00mm bore and 76.96mm diameter. This piston features superior strength and design with an optimized heat transfer to cylinder walls and an elliptical design for uniform load distribution. It has a high compression ratio of 13.50:1 compared to the OEM 11.80:1. Manufactured in Germany. Bore: 77.00mm, Diameter: 76.96mm, Display (cm³): 249, Stroke (mm): 53.60, Clearance (mm): 0.04, Dome Volume (cm³): -4.50, Compression Height (mm): 22.20. Includes Lock P/N: CW17, Pin P/N: WP083, and Ring Set P/N: 770XAS-2.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"77mm"},{"label":"Variant Id","value":"255151"}],"image":"https://www.oro2u.com/media/catalog/product/s/t/stock54097_1.jpg","images":["https://www.oro2u.com/media/catalog/product/s/t/stock54097_1.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock54097_2.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock54097_3.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock54097_4.jpg"],"description":"Wossner forged Pro Series piston kit with a 77.00mm bore and 76.96mm diameter. This piston features superior strength and design with an optimized heat transfer to cylinder walls and an elliptical design for uniform load distribution. It has a high compression ratio of 13.50:1 compared to the OEM 11.80:1. Manufactured in Germany. Bore: 77.00mm, Diameter: 76.96mm, Display (cm³): 249, Stroke (mm): 53.60, Clearance (mm): 0.04, Dome Volume (cm³): -4.50, Compression Height (mm): 22.20. Includes Lock P/N: CW17, Pin P/N: WP083, and Ring Set P/N: 770XAS-2.","descriptionMarkdown":"### Wossner Forged Piston Kit - High Performance for Yamaha WR250X\n\nUpgrade your Yamaha WR250X with this Wossner Pro Series forged piston kit, engineered for exceptional strength and high performance. Manufactured in Germany, this piston kit is designed to optimize engine efficiency and durability.\n\n**Key Features:**\n\n \n- Forged Construction: Provides superior strength and resistance to extreme operating conditions, ensuring longevity and reliability.\n \n- Optimized Heat Transfer: Facilitates efficient heat transfer to cylinder walls, promoting stable combustion temperatures and preventing premature wear.\n \n- Elliptical Design: This advanced design ensures a uniform bearing surface when the piston expands under heat, which reduces localized pressure and evenly distributes thrust loads. This prevents piston collapse and promotes smoother engine operation.\n \n- High Compression Ratio: Achieves a 13.50:1 compression ratio (compared to OEM 11.80:1), significantly increasing power output and throttle response.\n \n- German Engineering: Precision-manufactured in Germany for the highest quality and performance standards.\n\n**Specifications:**\n\n \n- Bore: 77.00mm\n \n- Diameter: 76.96mm\n \n- Engine Displacement: 249 cm&sup3;\n \n- Stroke: 53.60mm\n \n- Piston Clearance: 0.04mm\n \n- Wossner Compression Ratio: 13.50:1\n \n- OEM Compression Ratio: 11.80:1\n \n- Dome Volume: -4.50 cm&sup3;\n \n- Compression Height: 22.20mm\n\n**Included Components:**\n\n \n- Wossner Piston (Part Number: 8772DA)\n \n- Lock Ring (Part Number: CW17)\n \n- Piston Pin (Part Number: WP083)\n \n- Ring Set (Part Number: 770XAS-2)","weightGrams":null,"fitments":[{"make":"YAMAHA","model":"WR X 250","cc":null,"notes":null,"years":"2008–2012"}],"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-08-09-wr250x-77-hc-forged-wossner-8772da","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/c3bd0a64fa32:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/c3bd0a64fa32:1"}},"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."]}}