{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"a3094479e5a3","name":"PISTON KIT 75-81 DT400 MX 85.5, WOSSNER 8263D050 YAMAHA","sku":"56-W549_0.50.W0","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":195.02,"formatted":"£195.02"},"summary":"This Wossner piston kit features an 85.50mm bore size (85.42mm actual) and is designed for Yamaha DT400 and MX410 models. Manufactured in Germany, this forged piston is engineered for strength and thermal efficiency. The elliptical design supports even load distribution during expansion, reducing the risk of piston collapse by preventing localised pressure points. Features include forged construction for increased strength, elliptical design for uniform load distribution under heat expansion, and promotion of efficient combustion chamber heat transfer to cylinder walls. Specifications include a bore size of 85.50mm (85.42mm), display of 398 cm³, stroke of 70.00 mm, clearance of 0.08 mm, compression height of 40.00 mm, and a 2-stroke compression ratio (Wossner and OEM). Cross-reference OEM part numbers include Piston Kit: 8263D050, Lock: CW18, Pin: WP042, Ring Set: RSC8550 x2, and Part No.: 56-W549_0.50.WO. The kit weighs 532 grams.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"85.5mm"},{"label":"Variant Id","value":"256745"}],"image":"https://www.oro2u.com/media/catalog/product/s/t/stock55691_1.jpg","images":["https://www.oro2u.com/media/catalog/product/s/t/stock55691_1.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock55691_2.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock55691_3.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock55691_4.jpg"],"description":"This Wossner piston kit features an 85.50mm bore size (85.42mm actual) and is designed for Yamaha DT400 and MX410 models. Manufactured in Germany, this forged piston is engineered for strength and thermal efficiency. The elliptical design supports even load distribution during expansion, reducing the risk of piston collapse by preventing localised pressure points. Features include forged construction for increased strength, elliptical design for uniform load distribution under heat expansion, and promotion of efficient combustion chamber heat transfer to cylinder walls. Specifications include a bore size of 85.50mm (85.42mm), display of 398 cm³, stroke of 70.00 mm, clearance of 0.08 mm, compression height of 40.00 mm, and a 2-stroke compression ratio (Wossner and OEM). Cross-reference OEM part numbers include Piston Kit: 8263D050, Lock: CW18, Pin: WP042, Ring Set: RSC8550 x2, and Part No.: 56-W549_0.50.WO. The kit weighs 532 grams.","descriptionMarkdown":"### Wossner 85.50mm Forged Piston Kit for Yamaha DT400 and MX Models\n\nUpgrade your Yamaha DT400 or MX410 engine with this high-performance Wossner forged piston kit. Engineered in Germany for superior strength and thermal efficiency, this piston features an advanced elliptical design that ensures even load distribution and reduces the risk of piston collapse under extreme heat and pressure. This promotes efficient combustion chamber heat transfer to the cylinder walls for optimal performance.\n\n**Key Features:**\n\n \n- Forged construction for exceptional durability and strength.\n \n- Elliptical design promotes uniform load distribution during heat expansion.\n \n- Aids in efficient combustion chamber heat transfer to cylinder walls.\n \n- Precision manufactured in Germany.\n\n**Specifications:**\n\n \n- Bore Size: 85.50mm (Actual 85.42mm)\n \n- Displacement: 398 cm&sup3;\n \n- Stroke: 70.00 mm\n \n- Clearance: 0.08 mm\n \n- Compression Height: 40.00 mm\n \n- Compression Ratio: Compatible with 2-stroke applications (Wossner and OEM).","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-75-81-dt400-mx-855-wossner-8263d050-yamaha","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/a3094479e5a3:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/a3094479e5a3:1"}},"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."]}}