{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"c82d3cfb44ec","name":"PISTON KIT 08-12 WR250X 77.00, COMP. 13.5:1 WOSSNER 8729DA","sku":"56-W238+00A.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":2,"price":{"amount":182.4,"formatted":"£182.40"},"summary":"Wossner forged piston kit with a 77.00mm bore and 76.96mm diameter. Manufactured in Germany, this piston offers superior strength and design, ensuring optimal heat transfer to cylinder walls. Its elliptical design provides a uniform bearing surface under heat expansion, reducing localized pressure and evenly distributing thrust loads to prevent piston collapse. Features forged construction for superior strength, optimized heat transfer for efficient combustion, and an elliptical design for uniform load distribution. Specifications include a bore of 77.00mm, diameter of 76.96mm, display of 249 cm³, stroke of 53.60mm, clearance of 0.04mm, OEM compression ratio of 11.80:1, dome volume of -5.90 cm³, and compression height of 22.90mm. Cross-reference OEM part numbers include Wossner Piston Yamaha WR250X (PN# 8729DA), 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":"255147"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W238_2B00A_2EWO/2be003fa841f7315.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W238_2B00A_2EWO/2be003fa841f7315.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W238_2B00A_2EWO/bd6d8fe7a9c2c43f.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W238_2B00A_2EWO/1f7b9101381da544.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W238_2B00A_2EWO/112b15c6a74f8d2a.jpg"],"description":"Wossner forged piston kit with a 77.00mm bore and 76.96mm diameter. Manufactured in Germany, this piston offers superior strength and design, ensuring optimal heat transfer to cylinder walls. Its elliptical design provides a uniform bearing surface under heat expansion, reducing localized pressure and evenly distributing thrust loads to prevent piston collapse. Features forged construction for superior strength, optimized heat transfer for efficient combustion, and an elliptical design for uniform load distribution. Specifications include a bore of 77.00mm, diameter of 76.96mm, display of 249 cm³, stroke of 53.60mm, clearance of 0.04mm, OEM compression ratio of 11.80:1, dome volume of -5.90 cm³, and compression height of 22.90mm. Cross-reference OEM part numbers include Wossner Piston Yamaha WR250X (PN# 8729DA), Lock P/N: CW17, Pin P/N: WP083, and Ring Set P/N: 770XAS-2.","descriptionMarkdown":"### Wossner Forged Piston Kit for WR250X\n\nUpgrade your WR250X with this high-performance forged piston kit from Wossner. Engineered for superior strength and optimal performance, this piston is designed to enhance your motorcycle's combustion efficiency and durability. Manufactured with precision in Germany, Wossner pistons are renowned for their advanced design and robust construction.\n\nThe piston features an innovative elliptical design that ensures a uniform bearing surface even under extreme heat expansion. This design effectively reduces localized pressure points and evenly distributes thrust loads, preventing piston collapse and promoting longevity. Experience improved heat transfer to the cylinder walls, leading to more efficient combustion and reliable power delivery.\n\n**Key Features:**\n\n\t\n- Forged Construction: Provides exceptional strength and resistance to stress.\n\t\n- Optimized Heat Transfer: Enhances combustion efficiency and engine cooling.\n\t\n- Elliptical Design: Guarantees uniform load distribution and prevents localized pressure.\n\t\n- Precision Manufacturing: Made in Germany to the highest quality standards.\n\n**Specifications:**\n\n\t\n- Bore: 77.00mm\n\t\n- Diameter: 76.96mm\n\t\n- Display (cm&sup3;): 249\n\t\n- Stroke (mm): 53.60\n\t\n- Clearance (mm): 0.04\n\t\n- Compression Ratio (Wossner): OEM\n\t\n- Compression Ratio (OEM): 11.80:1\n\t\n- Dome Volume (cm&sup3;): -5.90\n\t\n- Compression Height (mm): 22.90\n\n**Included Components:**\n\n\t\n- Wossner Piston (Part Number: 8729DA)\n\t\n- Lock P/N: CW17\n\t\n- Pin P/N: WP083\n\t\n- Ring Set P/N: 770XAS-2","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-08-12-wr250x-7700-comp-1351-wossner-8729da","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/c82d3cfb44ec:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/c82d3cfb44ec: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."]}}