{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"43e54992a00e","name":"PISTON KIT 02-04 YZ125 54.00 C, WOSSNER 8072DC YAMAHA MX","sku":"56-W797.C.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":115.06,"formatted":"£115.06"},"summary":"Wossner forged piston kit with a 54.02mm bore and 53.96mm actual piston diameter. This piston kit features a +0.02mm oversize for Yamaha YZ125 models. Engineered for reliable performance, enhanced heat transfer, and structural stability in 2-stroke engines. Includes forged piston, elliptical profile for consistent bearing surface during thermal expansion, even thrust load distribution to prevent piston collapse and reduce localised stress. Manufactured in Germany. Specifications: Bore: 54.02mm, Piston Diameter: 53.96mm, Display (cm³): 125, Stroke (mm): 54.50, Clearance (mm): 0.06, Compression Height (mm): 28.00. Cross-Reference OEM Part Numbers: 5NY-11631-01-D0, 5NY-11631-01-C0, 5NY-11631-01-B0, 5NY-11631-01-A0, Ring: 5NY-11611-00-00, Pin: 5UN-11633-00-00, Circlip: 93450-16068-00. Included Components: Lock: CW15, Pin: WP032, Ring Set: RSB5400, Rod: P2017. Part Number: 56-W797.C.WO (Piston PN# 8072DC).","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"54.0mm"},{"label":"Variant Id","value":"257778"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W797_2EC_2EWO/97220119799339b9.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W797_2EC_2EWO/97220119799339b9.jpg"],"description":"Wossner forged piston kit with a 54.02mm bore and 53.96mm actual piston diameter. This piston kit features a +0.02mm oversize for Yamaha YZ125 models. Engineered for reliable performance, enhanced heat transfer, and structural stability in 2-stroke engines. Includes forged piston, elliptical profile for consistent bearing surface during thermal expansion, even thrust load distribution to prevent piston collapse and reduce localised stress. Manufactured in Germany. Specifications: Bore: 54.02mm, Piston Diameter: 53.96mm, Display (cm³): 125, Stroke (mm): 54.50, Clearance (mm): 0.06, Compression Height (mm): 28.00. Cross-Reference OEM Part Numbers: 5NY-11631-01-D0, 5NY-11631-01-C0, 5NY-11631-01-B0, 5NY-11631-01-A0, Ring: 5NY-11611-00-00, Pin: 5UN-11633-00-00, Circlip: 93450-16068-00. Included Components: Lock: CW15, Pin: WP032, Ring Set: RSB5400, Rod: P2017. Part Number: 56-W797.C.WO (Piston PN# 8072DC).","descriptionMarkdown":"### Wossner Piston Kit 54.02mm Yamaha YZ125 2002-2004\n\nThis Wossner piston kit features a 54.02mm bore and 53.96mm actual piston diameter, designed for Yamaha YZ125 models. Engineered with a +0.02mm oversize, this forged piston delivers reliable performance, enhanced heat transfer, and structural stability in high-performance 2-stroke engines.\n\n**Key Features:**\n\n\t\n- Forged piston ensures exceptional strength and durability\n\t\n- Engineered for effective heat transfer from the combustion chamber to cylinder walls\n\t\n- Elliptical profile provides a consistent bearing surface during thermal expansion\n\t\n- Even thrust load distribution prevents piston collapse and reduces localized stress\n\t\n- Manufactured in Germany\n\n**Specifications:**\n\n\t\n- Bore: 54.02mm\n\t\n- Piston Diameter: 53.96mm\n\t\n- Display (cm³): 125\n\t\n- Stroke (mm): 54.50\n\t\n- Clearance (mm): 0.06\n\t\n- Compression Height (mm): 28.00\n\t\n- Wossner Compression Ratio: 2-stroke\n\t\n- OEM Compression Ratio: 2-stroke\n\n**Cross-Reference OEM Part Numbers:**\n\n\t\n- 5NY-11631-01-D0\n\t\n- 5NY-11631-01-C0\n\t\n- 5NY-11631-01-B0\n\t\n- 5NY-11631-01-A0\n\t\n- Ring: 5NY-11611-00-00\n\t\n- Pin: 5UN-11633-00-00\n\t\n- Circlip: 93450-16068-00\n\n**Included Components:**\n\n\t\n- Lock: CW15\n\t\n- Pin: WP032\n\t\n- Ring Set: RSB5400\n\t\n- Rod: P2017\n\t\n- Part Number: (Piston PN# 8072DC)","weightGrams":null,"fitments":[{"make":"YAMAHA","model":"YZ 125","cc":null,"notes":null,"years":"1997–2004"}],"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-02-04-yz125-5400-c-wossner-8072dc-yamaha-mx","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/43e54992a00e:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/43e54992a00e: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."]}}