{"product_id":"prox-piston-kit-yz450f-wr450f-94-97mm-12-5-compression","title":"ProX Piston Kit Yamaha YZ450F '03-09 \/ WR450F '03-15 Stock 12.5:1 95mm (94.97mm)","description":"\u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: 0.000000px; color: transparent;\"\u003eShop ProX 94.97mm piston kit for Yamaha YZ450F \u0026amp; WR450F 2003-2015. High-performance 12.5:1 compression, OEM fit, complete rebuild solution. \u003c\/span\u003e\u003c\/p\u003e\u003cdiv style=\"max-width:800px;margin:0 auto;font-family:Arial,Helvetica,sans-serif;line-height:1.5;color:#222;\"\u003e \u003ch2 style=\"text-align:center;font-size:26px;margin:0 0 12px 0;\"\u003e \u003cstrong\u003eProX Piston Kit 94.97mm 12.5:1 Yamaha YZ450F 2003-2009 WR450F 2003-2015\u003c\/strong\u003e \u003c\/h2\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e📖 Product Description\u003c\/h3\u003e \u003cp style=\"text-align:center;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eUpgrade your engine performance with the \u003cstrong\u003eProX Piston Kit 94.97mm\u003c\/strong\u003e, engineered specifically for Yamaha YZ450F and WR450F models. Designed using premium low-expansion piston alloy and precision CNC machining, this kit delivers \u003cstrong\u003econsistent power, durability, and OEM-level reliability\u003c\/strong\u003e for demanding riders and racers alike.\u003c\/span\u003e\u003c\/p\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e🔥 Key Features \u0026amp; Benefits\u003c\/h3\u003e \u003cp style=\"text-align:center;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eBuilt to meet or exceed OEM specifications, this \u003cstrong\u003eProX piston kit\u003c\/strong\u003e ensures optimal combustion efficiency and long-lasting engine performance for off-road and motocross applications.\u003c\/span\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003ePrecision CNC-machined piston for superior fit and reliability\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e94.97mm piston diameter (+0.02mm) for exact bore tolerance\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e12.5:1 compression ratio for enhanced power output\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eLow-friction, low-expansion alloy used by major OEM manufacturers\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eComplete kit includes piston, rings, wrist pin, and circlips\u003c\/span\u003e\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e✅ Compatibility\u003c\/h3\u003e \u003cp style=\"text-align:center;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eDesigned as a direct OEM replacement using reference number \u003cstrong\u003e5TJ-11631-00\u003c\/strong\u003e, ensuring seamless installation and performance.\u003c\/span\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eYamaha YZ450F 2003–2009\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eYamaha WR450F 2003–2015\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eBore Diameter: 95.00mm (OEM matched)\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eCompression Height: 14.50mm\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eWrist Pin Bore: 18.00mm\u003c\/span\u003e\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e❓ Frequently Asked Questions (FAQ)\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\n\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eQ: Is this piston kit a direct OEM replacement?\u003c\/strong\u003e\u003c\/span\u003e \u003cp style=\"text-align:left;margin:0 0 10px 0;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eA: Yes, it matches OEM specs and replaces part number 5TJ-11631-00.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e \u003cli\u003e\n\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eQ: What is included in the kit?\u003c\/strong\u003e\u003c\/span\u003e \u003cp style=\"text-align:left;margin:0 0 10px 0;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eA: The kit includes piston, ring set, wrist pin, and circlips.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e \u003cli\u003e\n\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eQ: Does this improve engine performance?\u003c\/strong\u003e\u003c\/span\u003e \u003cp style=\"text-align:left;margin:0 0 10px 0;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eA: Yes, the 12.5:1 compression ratio enhances power and throttle response.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e \u003cli\u003e\n\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eQ: Is this suitable for racing use?\u003c\/strong\u003e\u003c\/span\u003e \u003cp style=\"text-align:left;margin:0 0 10px 0;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eA: Absolutely, it’s designed for high-performance and racing applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e🌟 Why Buy from BPRATV? Trusted Performance Experts 🌟\u003c\/h3\u003e \u003cp style=\"text-align:center;margin:0 20px;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eAt BPRATV, our promise is unwavering: \u003cstrong\u003eThe Best Parts. The Best Performance. The Best Price.\u003c\/strong\u003e Every component we offer is carefully selected to deliver unmatched reliability and performance for your Yamaha dirt bike. Trust BPRATV to keep your machine running at its best, \u003cstrong\u003eevery single time.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp style=\"text-align:center;margin:0 20px;\"\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp style=\"text-align:center;margin:0 20px;\"\u003e\u003cspan style=\"color:#38761d;font-size:16px;\"\u003e\u003cstrong\u003e\u003cem\u003eUpgrade your Yamaha today with this ProX piston kit and experience peak performance!\u003c\/em\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp style=\"text-align:center;margin:0 20px;\"\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp style=\"text-align:center;margin:0 20px;\"\u003e\u003cspan style=\"color:#0000ff;font-size:16px;\"\u003e\u003cstrong\u003eBPRATV - The Best Parts. The Best Performance. The Best Price.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp style=\"text-align:center;margin:0 20px;\"\u003e\u003cspan style=\"color:#0000ff;font-size:16px;\"\u003e\u003cstrong\u003eBRAPPPPPPPPPP!\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp style=\"text-align:center;font-size:10px;color:#555;margin:20px 0 0px;\"\u003e© BPRATV LLC 1-year limited warranty from the manufacturer for material or workmanship defects.* Due to the nature of high performance and racing applications, BPRATV LLC components are sold without express warranty or any implied warranty of merchantability or fitness for a specific purpose. BPRATV LLC shall not, under any circumstances, be liable for any specific, incidental or consequential damages, including, but not limited to, damage, or loss of property or equipment, loss of profits or revenue(s), cost of purchased or replacement goods, or claims of customers of the purpose, which may arise and\/or shall result from sale, installation or use of these parts. Installation of these parts may void vehicle manufacturers warranty coverage and\/or may cause the vehicle to be illegal in some locations. \u003cbr\u003e\u003cbr\u003eThis product is exempt from the emission standards and related requirements of 40 C.F.R. § 1051 as provided by 40 C.F.R. § 1051.620, and California law [e.g., vehicle code§§ 27156 and 38391]. This product is sold only for use in connection with EPA -certified, purpose-built, nonroad vehicles used solely for closed course, nonroad competition\/racing and not used for any recreational purpose or on public highways or right of ways maintained by and open to the public. This product is sold only in connection with machines that do not fall under state and\/or federal noise or emission standards\/regulations. Purchasers who\/that purchase this product represent and warrant that the product is purchased only in connection with EPA -certified, emission-regulations-exempt and noise-regulations-exempt competition\/racing vehicles as interpreted under applicable state and\/or federal law.\u003c\/p\u003e \u003c\/div\u003e \u003c!-- eBay Listing Titles: ProX Piston Kit 94.97mm Yamaha YZ450F 03-09 WR450F 03-15 12.5:1 Ratio ProX 94.97mm Piston Kit YZ450F WR450F 2003-2015 12.5:1 Compression OEM Yamaha YZ450F WR450F ProX Piston Kit 94.97mm 12.5:1 2003-2015 Engine ProX Engine Piston Kit 94.97mm 12.5:1 Yamaha YZ450F WR450F Rebuild Kit YZ450F WR450F 94.97mm ProX Piston Kit 12.5:1 High Compression 03-15 Recommended eBay Product Category: eBay Motors \u003e Parts \u0026 Accessories \u003e Motorcycle \u0026 Scooter Parts \u0026 Accessories \u003e Engines \u0026 Engine Parts \u003e Pistons, Rings \u0026 Kits Recommended Secondary Category: ATV, Side-by-Side \u0026 UTV Parts \u003e Engines \u0026 Components Top 10 eBay SEO Keywords: ProX piston kit YZ450F WR450F piston kit 94.97mm YZ450F engine rebuild kit ProX Yamaha piston 12.5:1 YZ450F piston replacement WR450F engine piston kit 94.97mm piston Yamaha ProX motorcycle piston kit YZ450F high compression piston WR450F rebuild piston kit Top 10 Search Engine Keywords: ProX piston kit Yamaha YZ450F WR450F 94.97mm piston Yamaha dirt bike YZ450F engine rebuild piston kit WR450F piston replacement kit Yamaha 450 piston 12.5 compression ProX motorcycle piston specs YZ450F performance piston kit WR450F OEM piston replacement Yamaha dirt bike engine parts piston ProX CNC piston Yamaha 450 Meta Title: ProX Piston Kit 94.97mm Yamaha YZ450F WR450F 2003-2015 12.5:1 Meta Description: Shop ProX 94.97mm piston kit for Yamaha YZ450F \u0026 WR450F 2003-2015. High-performance 12.5:1 compression, OEM fit, complete rebuild solution. URL Handles: prox-piston-kit-yz450f-wr450f-94-97mm-12-5-compression prox-yamaha-yz450f-wr450f-piston-kit-2003-2015-94-97mm yz450f-wr450f-prox-piston-kit-94-97mm-engine-rebuild prox-94-97mm-piston-kit-yamaha-450-dirt-bike-performance yamaha-yz450f-wr450f-piston-kit-prox-12-5-compression --\u003e","brand":"Pro-X","offers":[{"title":"Default Title","offer_id":46001400250565,"sku":"285471225979\/01.2429.C\/JT","price":172.22,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0593\/1083\/3861\/files\/285471225979-0.jpg?v=1774479991","url":"https:\/\/bpratv.com\/products\/prox-piston-kit-yz450f-wr450f-94-97mm-12-5-compression","provider":"BPRATV","version":"1.0","type":"link"}