{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"da07950135c8","name":"PISTON KIT 86-88 YZ125 57.50, WOSSNER 8118D150 YAMAHA MX","sku":"56-W559+150.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":125.68,"formatted":"£125.68"},"summary":"This Wossner 57.50mm (+1.50 oversize) forged piston kit is produced in Germany. The forged process enhances durability and strength. Its elliptical shape helps maintain a consistent bearing surface during thermal expansion, reducing localised stress and evenly distributing thrust loads to prevent piston collapse. The piston also supports efficient heat transfer from the combustion chamber to the cylinder walls, ensuring reliable performance in two-stroke engines. Features include forged piston for increased structural strength and durability, elliptical design for a uniform bearing surface during heat expansion, minimised localised pressure, even distribution of thrust loads, and support for efficient combustion heat transfer to cylinder walls. Specifications: Bore 57.50mm, actual diameter 57.44mm, displacement 123 cm³, stroke 50.00mm, clearance 0.06mm, compression height 30.00mm, compression ratio 2-stroke. Cross-reference OEM Part Numbers include Piston Kit Part No. 56-W559+150.WO, Wossner Piston Kit No. 8118D150, Lock CW16, Pin WP036, and Ring Set RSB5750.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"57.5mm"},{"label":"Variant Id","value":"256824"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W559_2B150_2EWO/ef1bb144b486020c.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W559_2B150_2EWO/ef1bb144b486020c.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W559_2B150_2EWO/e221a04fa6e64d0c.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W559_2B150_2EWO/40efb85b7943939f.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W559_2B150_2EWO/f3fc56af0ffdb65b.jpg"],"description":"This Wossner 57.50mm (+1.50 oversize) forged piston kit is produced in Germany. The forged process enhances durability and strength. Its elliptical shape helps maintain a consistent bearing surface during thermal expansion, reducing localised stress and evenly distributing thrust loads to prevent piston collapse. The piston also supports efficient heat transfer from the combustion chamber to the cylinder walls, ensuring reliable performance in two-stroke engines. Features include forged piston for increased structural strength and durability, elliptical design for a uniform bearing surface during heat expansion, minimised localised pressure, even distribution of thrust loads, and support for efficient combustion heat transfer to cylinder walls. Specifications: Bore 57.50mm, actual diameter 57.44mm, displacement 123 cm³, stroke 50.00mm, clearance 0.06mm, compression height 30.00mm, compression ratio 2-stroke. Cross-reference OEM Part Numbers include Piston Kit Part No. 56-W559+150.WO, Wossner Piston Kit No. 8118D150, Lock CW16, Pin WP036, and Ring Set RSB5750.","descriptionMarkdown":"### Wossner 57.50mm Forged Piston Kit for Yamaha YZ125\n\nEnhance the performance and durability of your Yamaha YZ125 with this premium Wossner forged piston kit. Precisely engineered in Germany, this 57.50mm (+1.50mm oversize) piston is designed to withstand the rigors of high-performance two-stroke engines.\n\n#### Key Features:\n\n\t\n- Forged construction for superior strength and longevity.\n\t\n- Elliptical piston design ensures a consistent bearing surface during thermal expansion, reducing stress and evenly distributing thrust loads.\n\t\n- Promotes efficient heat transfer from the combustion chamber to the cylinder walls for optimal operating temperatures.\n\t\n- Precision manufactured in Germany for uncompromising quality.\n\n#### Specifications:\n\n\t\n- Bore: 57.50mm\n\t\n- Actual Diameter: 57.44mm\n\t\n- Displacement: 123 cm&sup3;\n\t\n- Stroke: 50.00mm\n\t\n- Clearance: 0.06mm\n\t\n- Compression Height: 30.00mm\n\t\n- Compression Ratio: 2-stroke\n\n#### Included Components:\n\n\t\n- Piston\n\t\n- Lock: CW16\n\t\n- Pin: WP036\n\t\n- Ring Set: RSB5750\n\n**Cross-Reference OEM Part Numbers:**\n\n\t\n- Wossner Piston Kit No.: 8118D150","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-86-88-yz125-5750-wossner-8118d150-yamaha-mx","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/da07950135c8:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/da07950135c8:1"}},"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."]}}