{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"4258ab21c3d9","name":"PISTON KIT XR400 TRX400 85.50, FORGED WOSSNER 8604D050","sku":"56-W4606+050.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 an 85.50mm bore. Manufactured in Germany, this high-performance piston enhances strength, heat transfer, and durability. The elliptical design ensures uniform bearing surface distribution, reducing localized pressure and preventing piston collapse. Features include forged construction for superior strength and durability, optimized heat transfer to cylinder walls, elliptical design for uniform bearing surface under heat expansion, and increased compression ratio for improved engine performance. Specifications: Bore: 85.50mm (85.44mm actual), Display: 397 cm³, Stroke: 70.00mm, Clearance: 0.06mm, Wossner Compression Ratio: 11.00:1, OEM Compression Ratio: 10.00:1, Dome Volume: +3.20 cm³. Cross-Reference OEM Part Numbers: Wossner Piston: 8604D050, Lock: CW20, Pin: WP052, Ring Set: 855XSY, Rod: P4021.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"85.5mm"},{"label":"Variant Id","value":"255769"}],"image":"https://www.oro2u.com/media/catalog/product/s/t/stock54715_1.jpg","images":["https://www.oro2u.com/media/catalog/product/s/t/stock54715_1.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock54715_2.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock54715_3.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock54715_4.jpg"],"description":"Wossner forged piston kit with an 85.50mm bore. Manufactured in Germany, this high-performance piston enhances strength, heat transfer, and durability. The elliptical design ensures uniform bearing surface distribution, reducing localized pressure and preventing piston collapse. Features include forged construction for superior strength and durability, optimized heat transfer to cylinder walls, elliptical design for uniform bearing surface under heat expansion, and increased compression ratio for improved engine performance. Specifications: Bore: 85.50mm (85.44mm actual), Display: 397 cm³, Stroke: 70.00mm, Clearance: 0.06mm, Wossner Compression Ratio: 11.00:1, OEM Compression Ratio: 10.00:1, Dome Volume: +3.20 cm³. Cross-Reference OEM Part Numbers: Wossner Piston: 8604D050, Lock: CW20, Pin: WP052, Ring Set: 855XSY, Rod: P4021.","descriptionMarkdown":"### Wossner Forged Piston Kit 85.50mm for XR400 and TRX400\n\n Upgrade your engine's performance and durability with this premium forged piston kit from Wossner.\n Specifically engineered for Honda XR400R motorcycles and TRX400 series ATVs, this kit\n features a precise 85.50mm bore for an enhanced fit and improved power output.\n Manufactured in Germany, Wossner pistons are renowned for their superior strength,\n exceptional heat transfer capabilities, and long-lasting durability. The innovative\n elliptical design ensures a uniform bearing surface, even under extreme heat expansion,\n which effectively distributes pressure and prevents piston collapse, leading to a more reliable engine.\n\n**Key Features:**\n\n \n- Forged Construction: Provides significantly enhanced strength and durability over cast pistons.\n \n- Optimized Heat Transfer: Promotes efficient cooling by transferring heat effectively to the cylinder walls.\n \n- Elliptical Piston Design: Guarantees uniform bearing surface distribution to reduce localized pressure and prevent piston collapse under load.\n \n- Increased Compression: Boosts engine performance with an elevated compression ratio compared to OEM specifications.\n \n- German Engineering: Manufactured to exacting standards in Germany for guaranteed quality and performance.\n\n**Specifications:**\n\n \n- Bore Size: 85.50mm (Actual measurement: 85.44mm)\n \n- Engine Displacement: 397 cm&sup3;\n \n- Stroke: 70.00mm\n \n- Piston Clearance: 0.06mm\n \n- Wossner Compression Ratio: 11.00:1\n \n- OEM Compression Ratio: 10.00:1\n \n- Dome Volume: +3.20 cm&sup3;","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-xr400-trx400-8550-forged-wossner-8604d050","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/4258ab21c3d9:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/4258ab21c3d9:1"}},"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."]}}