{"product_id":"prox-01-2426-a-piston-kit-2003-09-yamaha-yz450f-03-11-wr450f-13-0-1cr","title":"ProX High-Compression Piston Kit (Part # 01.2426.A)","description":"\u003cdiv class=\"productDescription\"\u003e\n\u003cdiv class=\"primaryProductDescription\"\u003e\n\u003cblockquote data-path-to-node=\"14\"\u003e\n\u003cdiv class=\"container\"\u003e\n\u003cdiv class=\"markdown markdown-main-panel enable-updated-hr-color force-compact-layout md-content tutor-markdown-rendering\" id=\"model-response-message-contentr_c83d62464339b9a3\" aria-busy=\"false\" aria-live=\"polite\" dir=\"ltr\"\u003e\n\u003ch2 data-path-to-node=\"0\"\u003eProX High-Compression Piston Kit (Part # 01.2426.A)\u003c\/h2\u003e\n\u003cp data-path-to-node=\"1\"\u003e\u003cb data-path-to-node=\"1\" data-index-in-node=\"0\"\u003eUpgrade your engine's power and performance\u003c\/b\u003e with the \u003cb data-path-to-node=\"1\" data-index-in-node=\"53\"\u003eProX 01.2426.A High-Compression Piston Kit\u003c\/b\u003e. Precision CNC-machined in Japan to exact OEM tolerances, ProX piston kits are crafted from a low-expansion, low-friction high-silicon aluminum alloy—the same alloy utilized by major Japanese factory manufacturers. Designed as a premium, direct-fit replacement, this kit offers superior durability, optimal heat dissipation, and crisp throttle response.\u003c\/p\u003e\n\u003chr data-path-to-node=\"2\"\u003e\n\u003ch3 data-path-to-node=\"3\"\u003e\u003cb data-path-to-node=\"3\" data-index-in-node=\"0\"\u003eKey Features\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul data-path-to-node=\"4\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,0,0\"\u003e\u003cb data-path-to-node=\"4,0,0\" data-index-in-node=\"0\"\u003eHigh-Compression Design:\u003c\/b\u003e Delivers a \u003cb data-path-to-node=\"4,0,0\" data-index-in-node=\"36\"\u003e13.0:1 compression ratio\u003c\/b\u003e for increased torque and low-to-mid range throttle response.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,1,0\"\u003e\u003cb data-path-to-node=\"4,1,0\" data-index-in-node=\"0\"\u003eComplete Kit:\u003c\/b\u003e Includes piston, wrist pin, piston rings, and circlips for a hassle-free rebuild.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,2,0\"\u003e\u003cb data-path-to-node=\"4,2,0\" data-index-in-node=\"0\"\u003ePrecision Japanese Engineering:\u003c\/b\u003e Manufactured using CNC machinery to meet or exceed strict OEM specifications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,3,0\"\u003e\u003cb data-path-to-node=\"4,3,0\" data-index-in-node=\"0\"\u003eStandard Bore (\"A\" Size):\u003c\/b\u003e Fits standard bore cylinders without requiring resleeving or overboring.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-path-to-node=\"5\"\u003e\n\u003ch3 data-path-to-node=\"6\"\u003e\u003cb data-path-to-node=\"6\" data-index-in-node=\"0\"\u003eFitment\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul data-path-to-node=\"7\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,0,0\"\u003e\u003cb data-path-to-node=\"7,0,0\" data-index-in-node=\"0\"\u003eYamaha YZ450F\u003c\/b\u003e (2003–2009)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,1,0\"\u003e\u003cb data-path-to-node=\"7,1,0\" data-index-in-node=\"0\"\u003eYamaha WR450F\u003c\/b\u003e (2003–2011)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-path-to-node=\"8\"\u003e\n\u003cblockquote data-path-to-node=\"9\"\u003e\n\u003cp data-path-to-node=\"9,0\"\u003e\u003cb data-path-to-node=\"9,0\" data-index-in-node=\"0\"\u003eNote:\u003c\/b\u003e Please double-check your cylinder measurements and part number requirements prior to installation to ensure proper piston-to-wall clearance.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003c\/div\u003e\n\u003c!----\u003e\n\u003c\/div\u003e\n\u003c\/blockquote\u003e\n\u003cdiv data-en-clipboard=\"true\" data-pm-slice=\"1 1 []\" style=\"color: rgb(31, 33, 36); font-family: -apple-system, BlinkMacSystemFont,;\"\u003e*Free Shipping!\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 0px; color: rgb(31, 33, 36); font-family: -apple-system, BlinkMacSystemFont,;\"\u003e*📦 We only ship to the lower 48 states. We do not ship to Alaska, Hawaii, Guam, or Puerto Rico\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"font-size: large;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/hit.ebsh.io\/t\/hit.gif\" style=\"max-width: 100%;\"\u003e\u003c\/p\u003e","brand":"Pro-X","offers":[{"title":"Default Title","offer_id":41571378462794,"sku":"01.2624.A","price":179.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0226\/1499\/9114\/files\/20260513_141929999_iOS.jpg?v=1778682923","url":"https:\/\/updogindustries.com\/products\/prox-01-2426-a-piston-kit-2003-09-yamaha-yz450f-03-11-wr450f-13-0-1cr","provider":"UpdogIndustries.com","version":"1.0","type":"link"}