{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"c24c3da8795c","name":"CYLINDER FULL KIT 58MM YAMAHA YZ 125 05-21, ATHENA P400485100030 FOR 144CC BIG BORE, (Piston included)","sku":"56-K132.58.CKA","brand":"Athena","mpn":null,"gtin":null,"condition":"new","inStock":false,"stock":0,"price":{"amount":874.24,"formatted":"£874.24"},"summary":"ATHENA Big Bore Cylinder Kit Ø 58 mm, 144 cc - P400485100030. This kit includes a high-quality aluminum cylinder with an increased bore, cylinder head, complete piston with pin and rings, and all necessary gaskets. Cylinders are coated with motor-nicksil, a nickel-silicon coating for smoothness and wear resistance. Developed by Athena's R&D Department in Italy, these components are engineered to withstand high temperatures, pressures, and stresses. The kit can be installed without engine crankcase modifications. Bore Diameter 58.00 mm, Bore Gain + 4 mm, Compression Ratio 14.0:1, Displacement 144 cc. Net Weight 1.50 Kg.","attributes":[{"label":"General Product Group","value":"Engine"},{"label":"General Product Type","value":"Cylinder Kits"},{"label":"Variant Id","value":"252803"}],"image":"https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-K132_2E58_2ECKA/79596e16aa0c442a.jpg","images":["https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-K132_2E58_2ECKA/79596e16aa0c442a.jpg","https://b69270dd6ab1.blob.upstash.io/oracle/oro2u/56-K132_2E58_2ECKA/b1df889f7575bd33.jpg"],"description":"ATHENA Big Bore Cylinder Kit Ø 58 mm, 144 cc - P400485100030. This kit includes a high-quality aluminum cylinder with an increased bore, cylinder head, complete piston with pin and rings, and all necessary gaskets. Cylinders are coated with motor-nicksil, a nickel-silicon coating for smoothness and wear resistance. Developed by Athena's R&D Department in Italy, these components are engineered to withstand high temperatures, pressures, and stresses. The kit can be installed without engine crankcase modifications. Bore Diameter 58.00 mm, Bore Gain + 4 mm, Compression Ratio 14.0:1, Displacement 144 cc. Net Weight 1.50 Kg.","descriptionMarkdown":"### Athena 144cc Big Bore Cylinder Kit 58mm for Yamaha YZ 125 (2005-2021)\n\nEnhance the performance of your Yamaha YZ 125 with this Athena Big Bore Cylinder Kit. Engineered and designed in Italy by Athena's dedicated R&D department, this kit offers a significant increase in power and torque while maintaining the reliability of your original components. The precision-crafted aluminum cylinder features a 58mm bore, increasing displacement to 144cc. It is coated with Athena's proprietary motor-nicksil, a nickel-silicon coating that provides exceptional smoothness and wear resistance for long-lasting durability.\n\nThis comprehensive kit includes everything needed for installation, including a high-quality aluminum cylinder with an increased bore, a cylinder head, a complete piston assembly with piston pin and rings, and all necessary gaskets. Athena's components are rigorously tested on benches and in real-world conditions to ensure they can withstand extreme temperatures, pressures, and stresses. This big bore kit can be installed without requiring any modifications to the engine crankcase.\n\n#### Key Features:\n\n \n- Big Bore Upgrade: Increases displacement to 144cc for enhanced power and performance.\n \n- Precision Engineering: Designed and developed in Italy by Athena's R&D department.\n \n- Durable Coating: Features Athena's motor-nicksil coating for superior smoothness and wear resistance.\n \n- Complete Kit: Includes cylinder, cylinder head, piston kit (piston, pin, rings), and all necessary gaskets.\n \n- Reliability: Designed to maintain the reliability of original components.\n \n- Easy Installation: Can be installed without modifying the engine crankcase.\n \n- High Performance: Delivers observable power gains across the entire power curve.\n\n#### Technical Specifications:\n\n \n- Bore Diameter: 58.00 mm\n \n- Bore Gain: + 4 mm\n \n- Compression Ratio: 14.0:1\n \n- Displacement: 144 cc\n \n- Net Weight: 1.50 Kg","weightGrams":null,"fitments":[{"make":"YAMAHA","model":"YZ 125","cc":null,"notes":null,"years":"1997–2021"}],"collections":[{"name":"Engine","url":"https://www.2brosparts.com/api/agent/collection/GB/engine"},{"name":"Cylinder Kits","url":"https://www.2brosparts.com/api/agent/collection/GB/cylinder-kits"}],"links":{"page":"https://www.2brosparts.com/products/cylinder-full-kit-58mm-yamaha-yz-125-05-21-athena-p400485100030-for-144cc-big-bo","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."]}}