{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"5981662b5984","name":"PISTON KIT 1983 &85 YZ125 56.5, WOSSNER 8119D050 YAMAHA 39W-11-630-00-00","sku":"56-W503+050.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":122.21,"formatted":"£122.21"},"summary":"Wossner piston kit with 56.50mm bore and 56.44mm actual measured bore. Features a forged construction for increased strength and optimized heat transfer. The elliptical design ensures a uniform bearing surface and even thrust load distribution. Manufactured in Germany. Specifications include 83 cm³ display volume, 84.00mm stroke, 0.06mm clearance, 2-stroke compression ratio, 30.80mm compression height, CW16 lock part number, WP036 pin part number, and RSB5600 ring set part number. Cross-reference OEM part numbers include 39W-11-630-00-00 and 55Y-11631-00-94.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"56.5mm"},{"label":"Variant Id","value":"256559"}],"image":"https://www.oro2u.com/media/catalog/product/s/t/stock55505_1.jpg","images":["https://www.oro2u.com/media/catalog/product/s/t/stock55505_1.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock55505_2.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock55505_3.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock55505_4.jpg"],"description":"Wossner piston kit with 56.50mm bore and 56.44mm actual measured bore. Features a forged construction for increased strength and optimized heat transfer. The elliptical design ensures a uniform bearing surface and even thrust load distribution. Manufactured in Germany. Specifications include 83 cm³ display volume, 84.00mm stroke, 0.06mm clearance, 2-stroke compression ratio, 30.80mm compression height, CW16 lock part number, WP036 pin part number, and RSB5600 ring set part number. Cross-reference OEM part numbers include 39W-11-630-00-00 and 55Y-11631-00-94.","descriptionMarkdown":"### Wossner 56.50mm Forged Piston Kit for Yamaha YZ125\n\nEnhance the performance and durability of your Yamaha YZ125 with this premium forged piston kit from Wossner. Engineered for strength and precision, this kit features a 56.50mm bore, offering a +0.01 oversize for optimal fitment. Wossner pistons are manufactured in Germany using advanced forging techniques to provide superior strength and ensure efficient heat transfer from the combustion chamber to the cylinder walls. The innovative elliptical design promotes a uniform bearing surface, adapting to heat expansion and distributing thrust loads evenly to prevent piston collapse and maintain consistent performance.\n\n**Key Features:**\n\n\t\n- Forged Construction: Provides exceptional strength and resilience for demanding applications.\n\t\n- Optimized Heat Transfer: Designed to effectively move heat from the combustion chamber to the cylinder walls, aiding in thermal management.\n\t\n- Elliptical Piston Design: Ensures a uniform bearing surface under varying temperatures and distributes thrust loads evenly for reduced wear and improved longevity.\n\t\n- Precision Manufacturing: Made in Germany to exacting standards for reliability and performance.\n\n**Specifications:**\n\n\t\n- Bore Size: 56.50mm\n\t\n- Actual Measured Bore: 56.44mm\n\t\n- Display Volume: 83 cm&sup3;\n\t\n- Stroke: 84.00mm\n\t\n- Clearance: 0.06mm\n\t\n- Compression Height: 30.80mm\n\t\n- Lock Part Number: CW16\n\t\n- Pin Part Number: WP036\n\t\n- Ring Set Part Number: RSB5600\n\n**Cross-Reference OEM Part Numbers:**\n\n\t\n- 39W-11-630-00-00\n\t\n- 55Y-11631-00-94","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-1983-85-yz125-565-wossner-8119d050-yamaha-39w-11-630-00-00","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/5981662b5984:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/5981662b5984:1"}},"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."]}}