{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"65aac0027808","name":"YAMAHA YZ 250 1990-1995 GRADE D 67.97mm TWIN RING PISTON","sku":"V.2154D","brand":"Vertex","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":1,"price":{"amount":218.62,"formatted":"£218.62"},"summary":"Vertex pistons are manufactured using Low-Ex aluminium alloys, silicon charged with 12%, 18% or 21% depending on the application. Pistons are manufactured using gravity cast or hydraulic forging processes, then material structure is refined using heat treatment in an automatic HT implant with solubilization by quench in hot water. Machining is completed using CNC machines and software with diamond tools to achieve specific surface finishes. Every Vertex piston undergoes a rigorous manual and automatic quality control process. Vertex pistons are coated with a special Molybdenum Bisulphite black coating to aid during piston break-in and reduce friction within the cylinder. Vertex also offers a new Phosphate Coating with increased hardness and light surface porosity for superior adhesion of the Molybdenum Coating, extending coating durability. This piston is Grade D with a 67.97mm bore and twin rings.","attributes":[],"image":"https://www.twsgb.co.uk/Graphics/Std_Product_Images/yamaha-yz-250-1990-1995-grade-d-67.97mm-twin-ring-piston-5045-p.jpg","images":["https://www.twsgb.co.uk/Graphics/Std_Product_Images/yamaha-yz-250-1990-1995-grade-d-67.97mm-twin-ring-piston-5045-p.jpg"],"description":"Vertex pistons are manufactured using Low-Ex aluminium alloys, silicon charged with 12%, 18% or 21% depending on the application. Pistons are manufactured using gravity cast or hydraulic forging processes, then material structure is refined using heat treatment in an automatic HT implant with solubilization by quench in hot water. Machining is completed using CNC machines and software with diamond tools to achieve specific surface finishes. Every Vertex piston undergoes a rigorous manual and automatic quality control process. Vertex pistons are coated with a special Molybdenum Bisulphite black coating to aid during piston break-in and reduce friction within the cylinder. Vertex also offers a new Phosphate Coating with increased hardness and light surface porosity for superior adhesion of the Molybdenum Coating, extending coating durability. This piston is Grade D with a 67.97mm bore and twin rings.","descriptionMarkdown":"### Vertex Grade D Twin Ring Piston\n\nThe Vertex Grade D Twin Ring Piston is engineered for riders seeking premium performance and reliable engine longevity. Designed for demanding applications, this high-quality replacement piston utilizes advanced manufacturing techniques to ensure optimal combustion efficiency and durability.\n\n### Advanced Materials and Construction\n\nVertex pistons are manufactured using exotic Low-Ex (low expansion) aluminium alloys, precision-charged with high silicon content for superior thermal stability. Each piston undergoes a sophisticated gravity cast or hydraulic forging process, followed by state-of-the-art heat treatment. This process refines the material structure to provide exceptional strength under high-stress operating conditions.\n\n### Precision Machining and Quality Control\n\nEvery piston is machined using cutting-edge CNC technology and diamond-tipped tooling to achieve exacting tolerances and specific surface finishes tailored to your engine requirements. Before leaving the factory, each unit must pass through rigorous manual and automatic quality control inspections to ensure it meets the highest standards of performance.\n\n### Specialized Coatings for Longevity\n\nTo maximize engine health and performance, this piston features a dual-layer coating system:\n\n \n- Phosphate Coating: An all-over base treatment that increases surface hardness and provides a light porosity, allowing for superior adhesion of the secondary coating.\n \n- Molybdenum Bisulphite Coating: A high-performance finish that significantly reduces friction during the critical break-in period and provides long-term lubrication while working inside the cylinder.\n\n### Key Features\n\n \n- Grade D piston diameter: 67.97mm\n \n- Twin ring configuration for improved sealing\n \n- Advanced Low-Ex silicon-charged aluminium alloy construction\n \n- Phosphate base coating for increased durability and adhesion\n \n- Molybdenum Bisulphite friction-reducing top coating\n \n- Precision CNC machined for perfect fitment and performance","weightGrams":null,"fitments":[],"collections":[],"links":{"page":"https://www.2brosparts.com/products/yamaha-yz-250-1990-1995-grade-d-6797mm-twin-ring-piston","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/65aac0027808:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/65aac0027808:1"}},"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."]}}