{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"e4f6bc3f773d","name":"PISTON KIT 40mm 1981-2021 YAMAHA PW50 18U-11631-00-A0","sku":"56-W938+000.DR","brand":"Dirt Racing","mpn":null,"gtin":null,"condition":"new","inStock":false,"stock":0,"price":{"amount":19.8,"formatted":"£19.80"},"summary":"This piston kit is a standard replacement designed for Yamaha 50cc models from 1979 to 2021. It provides precise fitment and durability for small two-stroke engines, matching or exceeding OEM specifications. Constructed from high-tech materials for long-lasting performance and reliability. Elliptically designed for consistent bearing surface under thermal expansion. Direct OEM replacement for easy installation. Includes all necessary components for complete piston replacement. Manufactured to meet or exceed OEM quality standards. Specifications: Piston Diameter: 40mm, Piston Height: 50mm, Piston Pin Length: 33mm, Piston Pin Outer Diameter: 10mm. Package includes: 1 x Piston, 2 x Piston Rings, 1 x Piston Pin, 1 x Small End Bearing, 2 x Circlips. Cross-Reference OEM Part Numbers: PROX 01.2005.000, Piston (Std): 18U-11631-00-A0, 4J2-11631-00-A0, Piston Pin: 3L5-11633-00-00, Piston Ring Set (Std): 260-11610-04-00, 260-11601-03-00, Circlip: 93450-11021-00. Manufacturer: Dirt Racing.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Pistons & Kits"},{"label":"General Size","value":"40.00mm"},{"label":"Variant Id","value":"298625"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W938_2B000_2EDR/79a6bc7d16003ecd.png","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W938_2B000_2EDR/79a6bc7d16003ecd.png","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W938_2B000_2EDR/257498d02ef140f5.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W938_2B000_2EDR/44bf91ef368ca4e2.png","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-W938_2B000_2EDR/b54ead270bcf16f3.png"],"description":"This piston kit is a standard replacement designed for Yamaha 50cc models from 1979 to 2021. It provides precise fitment and durability for small two-stroke engines, matching or exceeding OEM specifications. Constructed from high-tech materials for long-lasting performance and reliability. Elliptically designed for consistent bearing surface under thermal expansion. Direct OEM replacement for easy installation. Includes all necessary components for complete piston replacement. Manufactured to meet or exceed OEM quality standards. Specifications: Piston Diameter: 40mm, Piston Height: 50mm, Piston Pin Length: 33mm, Piston Pin Outer Diameter: 10mm. Package includes: 1 x Piston, 2 x Piston Rings, 1 x Piston Pin, 1 x Small End Bearing, 2 x Circlips. Cross-Reference OEM Part Numbers: PROX 01.2005.000, Piston (Std): 18U-11631-00-A0, 4J2-11631-00-A0, Piston Pin: 3L5-11633-00-00, Piston Ring Set (Std): 260-11610-04-00, 260-11601-03-00, Circlip: 93450-11021-00. Manufacturer: Dirt Racing.","descriptionMarkdown":"### Dirt Racing Piston Kit - 40mm Standard Replacement\n\nThis Dirt Racing Piston Kit is a high-quality, standard replacement designed for optimal performance and durability in Yamaha 50cc two-stroke engines. Engineered to match or exceed original equipment manufacturer (OEM) specifications, this kit ensures a precise fit and reliable operation for your motorcycle.\n\n**Key Features:**\n\n\t\n- Durable Construction: Crafted from advanced materials for exceptional longevity and consistent performance.\n\t\n- Elliptical Design: Features an elliptical piston shape to maintain a stable bearing surface, even under thermal expansion.\n\t\n- Direct OEM Replacement: Designed for straightforward installation, serving as a direct substitute for your original piston.\n\t\n- Complete Kit: Includes all necessary components for a full piston replacement, simplifying the repair process.\n\t\n- Quality Assurance: Manufactured to stringent quality standards, guaranteeing reliability and performance.\n\n**Specifications:**\n\n\t\n- Piston Diameter: 40mm\n\t\n- Piston Height: 50mm\n\t\n- Piston Pin Length: 33mm\n\t\n- Piston Pin Outer Diameter: 10mm\n\n**Package Contents:**\n\n\t\n- 1 x Piston\n\t\n- 2 x Piston Rings\n\t\n- 1 x Piston Pin\n\t\n- 1 x Small End Bearing\n\t\n- 2 x Circlips\n\n**Cross-Reference OEM Part Numbers:**\n\n\t\n- PROX: 01.2005.000\n\t\n- Piston (Std): 18U-11631-00-A0, 4J2-11631-00-A0\n\t\n- Piston Pin: 3L5-11633-00-00\n\t\n- Piston Ring Set (Std): 260-11610-04-00, 260-11601-03-00\n\t\n- Circlip: 93450-11021-00","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-40mm-1981-2021-yamaha-pw50-18u-11631-00-a0","buyOneNow":null,"basketWithThis":null}},"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."]}}