{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"18a12cd5919c","name":"PISTON 99-09 TM250 66.4 DOME, WOSSNER 8137DB FORGED KIT, SINGLE RING","sku":"56-W021.B.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":2,"price":{"amount":153.68,"formatted":"£153.68"},"summary":"Wossner forged piston kit 56-W021.B.WO for 2-stroke engines, 66.4mm bore, domed design. Features forged construction for durability, optimized heat transfer, elliptical design to prevent localized pressure and piston collapse, and a single-ring configuration for reduced friction. Specifications include 66.34mm bore, 66.41mm piston size, 249cm³ displacement, 72.00mm stroke, 0.07mm clearance, 2-stroke compression ratio, domed dome volume, and 38.00mm compression height. Compatible with CW18 lock, WP033 pin, and RSB6640 x2 ring set. Manufactured in Germany.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"Variant Id","value":"254280"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W021_2EB_2EWO/25d13a8e53b2be8f.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W021_2EB_2EWO/25d13a8e53b2be8f.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W021_2EB_2EWO/adccbbd54ff20fb9.jpg"],"description":"Wossner forged piston kit 56-W021.B.WO for 2-stroke engines, 66.4mm bore, domed design. Features forged construction for durability, optimized heat transfer, elliptical design to prevent localized pressure and piston collapse, and a single-ring configuration for reduced friction. Specifications include 66.34mm bore, 66.41mm piston size, 249cm³ displacement, 72.00mm stroke, 0.07mm clearance, 2-stroke compression ratio, domed dome volume, and 38.00mm compression height. Compatible with CW18 lock, WP033 pin, and RSB6640 x2 ring set. Manufactured in Germany.","descriptionMarkdown":"### Wossner Forged Piston Kit for 2-Stroke Engines\n\nThis Wossner forged piston kit is engineered for exceptional strength and performance in 2-stroke motorcycle engines. Manufactured in Germany, it is designed for optimal heat transfer from the combustion chamber to the cylinder walls, ensuring efficient operation. The innovative elliptical design provides a uniform bearing surface even under heat expansion, effectively reducing localized pressure and distributing thrust loads evenly to prevent piston collapse.\n\n**Key Features:**\n\n\t\n- Forged Construction: Offers superior durability and strength for demanding applications.\n\t\n- Optimized Heat Transfer: Enhances engine performance by efficiently managing heat.\n\t\n- Elliptical Design: Prevents localized pressure points and ensures even load distribution, safeguarding against piston collapse.\n\t\n- Domed Piston: Features a domed top for increased combustion efficiency.\n\t\n- Single-Ring Configuration: Minimizes friction and contributes to improved overall performance.\n\n**Specifications:**\n\n\t\n- Bore: 66.34 mm\n\t\n- Piston Size: 66.41 mm\n\t\n- Displacement: 249 cm&sup3;\n\t\n- Stroke: 72.00 mm\n\t\n- Clearance: 0.07 mm\n\t\n- Dome Volume: Domed\n\t\n- Compression Height: 38.00 mm\n\n**Included Components:**\n\n\t\n- Wossner Forged Piston\n\t\n- Lock: CW18\n\t\n- Pin: WP033\n\t\n- Ring Set: RSB6640 x2","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-8137db-forged-kit-single-ring","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/18a12cd5919c:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/18a12cd5919c: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."]}}