{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"fad2a70713d5","name":"PISTON 99-09 TM250 66.4 DOME, WOSSNER 8137DD FORGED KIT, SINGLE RING","sku":"56-W021.D.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":3,"price":{"amount":153.68,"formatted":"£153.68"},"summary":"Wossner 56-W021.D.WO forged piston kit for 2-stroke engines. Features a 66.4mm dome, single ring, and forged construction for enhanced durability and performance. Optimized heat transfer from the combustion chamber to cylinder walls. Elliptical design ensures uniform bearing surface under heat expansion, reducing localized pressure and distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany. Bore: 66.36 mm, Piston Size: 66.44 mm, Displacement: 249 cm&sup3;, Stroke: 72.00 mm, Clearance: 0.07 mm. Dome Volume: Domed, Compression Height: 38.00 mm. Cross-reference OEM part numbers: Lock: CW18, Pin: WP033, Ring Set: RSB6640 x2.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"Variant Id","value":"254281"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W021_2ED_2EWO/25d13a8e53b2be8f.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W021_2ED_2EWO/25d13a8e53b2be8f.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W021_2ED_2EWO/adccbbd54ff20fb9.jpg"],"description":"Wossner 56-W021.D.WO forged piston kit for 2-stroke engines. Features a 66.4mm dome, single ring, and forged construction for enhanced durability and performance. Optimized heat transfer from the combustion chamber to cylinder walls. Elliptical design ensures uniform bearing surface under heat expansion, reducing localized pressure and distributing thrust loads evenly to prevent piston collapse. Manufactured in Germany. Bore: 66.36 mm, Piston Size: 66.44 mm, Displacement: 249 cm&sup3;, Stroke: 72.00 mm, Clearance: 0.07 mm. Dome Volume: Domed, Compression Height: 38.00 mm. Cross-reference OEM part numbers: Lock: CW18, Pin: WP033, Ring Set: RSB6640 x2.","descriptionMarkdown":"### Wossner 66.44mm Forged Piston Kit for 2-Stroke Engines\n\nThis Wossner forged piston kit is engineered for enhanced strength and superior performance in 2-stroke motorcycle engines. It is meticulously designed to optimize heat transfer from the combustion chamber directly to the cylinder walls, ensuring efficient operation. The unique elliptical design of the piston surface guarantees a uniform bearing area even under extreme heat expansion. This feature effectively reduces localized pressure and distributes thrust loads evenly across the piston skirt, preventing premature piston collapse and extending component life.\n\n**Key Features:**\n\n\t\n- Forged Construction: Provides exceptional durability and resistance to stress for high-performance applications.\n\t\n- Optimized Heat Transfer: Facilitates efficient heat dissipation, contributing to consistent power output and engine longevity.\n\t\n- Elliptical Piston Design: Ensures even load distribution and prevents localized pressure points, enhancing stability and preventing collapse under thermal stress.\n\t\n- Domed Piston Top: Designed to increase combustion efficiency and power output.\n\t\n- Single-Ring Configuration: Minimizes friction for improved engine responsiveness and peak performance.\n\n**Specifications:**\n\n\t\n- Bore Size: 66.36 mm\n\t\n- Piston Diameter: 66.44 mm\n\t\n- Engine Displacement: 249 cm&sup3;\n\t\n- Stroke Length: 72.00 mm\n\t\n- Piston Clearance: 0.07 mm\n\t\n- Dome Volume: Domed\n\t\n- Compression Height: 38.00 mm\n\t\n- Piston Material: Forged Aluminum Alloy","weightGrams":null,"fitments":[{"make":"TM","model":"CROSS 250","cc":null,"notes":null,"years":"1999–2019"},{"make":"TM","model":"EN 250","cc":null,"notes":null,"years":"1999–2013"},{"make":"TM","model":"ENDURO 250","cc":null,"notes":null,"years":"1999–2019"},{"make":"TM","model":"MX 250","cc":null,"notes":null,"years":"1999–2013"},{"make":"TM","model":"TM 250","cc":null,"notes":null,"years":"1999–2013"}],"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-99-09-tm250-664-dome-wossner-8137dd-forged-kit-single-ring","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/fad2a70713d5:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/fad2a70713d5:1"}},"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."]}}