{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"585b2d878c9e","name":"PISTON KIT SET/4 YZF R6 01-05, WOSSNER K8831DA-4 YAMAHA","sku":"56-W9904.000.WO","brand":"Wossner","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":793.43,"formatted":"£793.43"},"summary":"Set of 4 Wossner forged pistons for Yamaha YZF R6 2001-2005. Standard bore size 65.50mm, actual piston diameter 65.44mm. Elliptical design for consistent thrust load distribution and reduced stress. Engineered for efficient combustion heat transfer. Made in Germany. Part Number: K8831DA-4. Specifications: Bore Size 65.50mm, Displacement 600cc (display 600/617/636 cm&sup3;), Stroke 44.50mm, Clearance 0.06mm, Wossner Compression Ratio OEM, OEM Compression Ratio 12.40:1, Dome Volume -0.10cm&sup3;, Compression Height 21.20mm. Cross-Reference: Clip CW16, Piston Pin WP036, Replacement Ring Set 655XKS.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"Variant Id","value":"259123"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W9904_2E000_2EWO/9e90dc4fb34bc7ea.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W9904_2E000_2EWO/9e90dc4fb34bc7ea.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W9904_2E000_2EWO/f46704fe5eb2c9c8.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W9904_2E000_2EWO/15a547e08b4e9fe2.jpg"],"description":"Set of 4 Wossner forged pistons for Yamaha YZF R6 2001-2005. Standard bore size 65.50mm, actual piston diameter 65.44mm. Elliptical design for consistent thrust load distribution and reduced stress. Engineered for efficient combustion heat transfer. Made in Germany. Part Number: K8831DA-4. Specifications: Bore Size 65.50mm, Displacement 600cc (display 600/617/636 cm&sup3;), Stroke 44.50mm, Clearance 0.06mm, Wossner Compression Ratio OEM, OEM Compression Ratio 12.40:1, Dome Volume -0.10cm&sup3;, Compression Height 21.20mm. Cross-Reference: Clip CW16, Piston Pin WP036, Replacement Ring Set 655XKS.","descriptionMarkdown":"### Wossner Piston Kit Set for Yamaha YZF R6 (2001-2005)\n\nUpgrade your Yamaha YZF R6's performance and reliability with this premium Wossner forged piston kit. Designed for the 2001-2005 models, this set includes four high-quality pistons engineered in Germany for exceptional durability and power. Each piston features an advanced elliptical design to manage thrust loads effectively during thermal expansion, minimizing stress and ensuring structural integrity. This kit maintains OEM compression standards, making it an ideal choice for performance enthusiasts.\n\n#### Key Features\n\n\t\n- Set of 4 premium forged Wossner pistons\n\t\n- Precision manufactured in Germany\n\t\n- Elliptical piston design for optimized thrust load distribution\n\t\n- Engineered for superior combustion heat transfer\n\t\n- Maintains OEM compression ratio for consistent performance\n\n#### Specifications\n\n\t\n- Part Number: K8831DA-4\n\t\n- Standard Bore Size: 65.50mm\n\t\n- Actual Piston Diameter: 65.44mm\n\t\n- Engine Displacement: 600cc (Display Displacement: 600 / 617 / 636 cm&sup3;)\n\t\n- Stroke: 44.50mm\n\t\n- Piston Clearance: 0.06mm\n\t\n- Wossner Compression Ratio: OEM\n\t\n- OEM Compression Ratio: 12.40:1\n\t\n- Dome Volume: -0.10cm&sup3;\n\t\n- Compression Height: 21.20mm\n\n#### Included Components & Replacements\n\n\t\n- Piston Pin: WP036\n\t\n- Clip: CW16\n\t\n- Replacement Ring Set: 655XKS","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-set4-yzf-r6-01-05-wossner-k8831da-4-yamaha","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/585b2d878c9e:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/585b2d878c9e: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."]}}