{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"0a438fbabe42","name":"PISTON KIT 01-09 YFM660 100 HC, FORGED WOSSNER 8577DA 3YF-11631-00-X0","sku":"56-W4737.HC.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":2,"price":{"amount":220.73,"formatted":"£220.73"},"summary":"Wossner forged piston kit with 100mm bore and 99.93mm size for high compression performance. Manufactured in Germany, this piston is engineered to enhance heat transfer, ensuring uniform expansion and even thrust load distribution. The elliptical design prevents localized pressure and piston collapse, making it ideal for high-performance applications. Features include high-strength forged piston for durability, optimized heat transfer for improved combustion efficiency, elliptical design for uniform expansion and reduced localized pressure, and high compression ratio for enhanced engine performance. Specifications include bore 100mm, size 99.93mm, part number 8577DA, OEM compression ratio 19.20:1, lock part number CW22, ring set part number 1000XSY, rod part numbers P4037 (2001) P4038 (2002-2005), displacement 660 cm³, stroke 84.00mm, clearance 0.07mm, dome volume +18.20 cm³, and compression height 27.00mm. Cross-reference OEM part numbers are 3YF-11631-00-X0 and 44737M10000.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"100mm"},{"label":"Variant Id","value":"256010"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4737_2EHC_2EWO/159a8d7e8649b689.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4737_2EHC_2EWO/159a8d7e8649b689.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4737_2EHC_2EWO/0b7bcfccb85b2ef8.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4737_2EHC_2EWO/ad1f36be32b831da.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W4737_2EHC_2EWO/2790caf6d02cf4c7.jpg"],"description":"Wossner forged piston kit with 100mm bore and 99.93mm size for high compression performance. Manufactured in Germany, this piston is engineered to enhance heat transfer, ensuring uniform expansion and even thrust load distribution. The elliptical design prevents localized pressure and piston collapse, making it ideal for high-performance applications. Features include high-strength forged piston for durability, optimized heat transfer for improved combustion efficiency, elliptical design for uniform expansion and reduced localized pressure, and high compression ratio for enhanced engine performance. Specifications include bore 100mm, size 99.93mm, part number 8577DA, OEM compression ratio 19.20:1, lock part number CW22, ring set part number 1000XSY, rod part numbers P4037 (2001) P4038 (2002-2005), displacement 660 cm³, stroke 84.00mm, clearance 0.07mm, dome volume +18.20 cm³, and compression height 27.00mm. Cross-reference OEM part numbers are 3YF-11631-00-X0 and 44737M10000.","descriptionMarkdown":"### Wossner Forged Piston Kit - High Compression Performance\n\nEnhance your motorcycle's engine performance with this high-compression forged piston kit from Wossner. Engineered in Germany for superior durability and efficiency, this kit is designed to deliver optimal power output.\n\n**Key Features:**\n\n \n- High-strength forged construction for exceptional longevity.\n \n- Advanced design promotes superior heat transfer for improved combustion efficiency.\n \n- Elliptical piston shape ensures uniform expansion and reduces localized pressure, preventing piston collapse.\n \n- Achieve higher engine performance with the integrated high compression ratio.\n \n- Manufactured to exacting standards in Germany.\n\n**Specifications:**\n\n \n- Bore Size: 100mm\n \n- Exact Piston Size: 99.93mm\n \n- Wossner Part Number: 8577DA\n \n- Compression Ratio: OEM\n \n- OEM Compression Ratio: 19.20:1\n \n- Lock Ring Part Number: CW22\n \n- Ring Set Part Number: 1000XSY\n \n- Engine Displacement: 660 cm&sup3;\n \n- Stroke: 84.00mm\n \n- Recommended Piston Clearance: 0.07mm\n \n- Dome Volume: +18.20 cm&sup3;\n \n- Compression Height: 27.00mm\n\n**Cross-Reference OEM Part Numbers:**\n\n \n- 3YF-11631-00-X0\n \n- 44737M10000","weightGrams":null,"fitments":[{"make":"YAMAHA","model":"YFM F GRIZZLY 660","cc":null,"notes":null,"years":"2002–2008"},{"make":"YAMAHA","model":"YFM R RAPTOR 660","cc":null,"notes":null,"years":"2001–2008"},{"make":"YAMAHA","model":"YXR RHINO 660","cc":null,"notes":null,"years":"2005–2007"}],"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-01-09-yfm660-100-hc-forged-wossner-8577da-3yf-11631-00-x0","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/0a438fbabe42:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/0a438fbabe42:1"}},"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."]}}