{"product_id":"yamaha-yfz450r-yfz-450r-478cc-big-bore-top-end-kit-3-cp-piston-cylinder-cometic","title":"Yamaha YFZ450R YFZ 450R 478cc Big Bore Top End Kit +3 CP Piston Cylinder Cometic","description":"\u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: 0.000001px; color: transparent;\"\u003eBoost your Yamaha YFZ450R\/YFZ450X to 478cc with BPRATV’s 98mm big bore top end kit. Includes CP forged piston, Nikasil cylinder, and Cometic MLS gaskets. Reliable power, OEM-plus fit. Works with pump or race gas.,21003-1, M1009, C3178, C3178-EST, 20003, M1006, C7908, 71014-5, 2S2-11181-00-00, 3VD-14613-01-00, 94591-57120-00, 2S2-11311-30-00, 4FM-12213-00, 5TG-11631-12-00, 5TG-11633-10-00, 5TG-11631-21-00, M1002, 93450-22027-00, 2S2-11351-00-00\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\u003eYamaha YFZ450R\/X 478cc Big Bore Top End Kit | 98mm CP Piston + Cylinder + Cometic\u003c\/strong\u003e \u003c\/h2\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e🔥 Turn Your YFZ450R into a 478cc Powerhouse\u003c\/h3\u003e \u003cp style=\"text-align:center;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eUnleash the full potential of your fuel-injected \u003cstrong\u003eYamaha YFZ450R \/ YFZ450X\u003c\/strong\u003e with this premium \u003cstrong\u003e98mm Big Bore Top End Rebuild Kit\u003c\/strong\u003e. Boost displacement to \u003cstrong\u003e478cc\u003c\/strong\u003e and compression to \u003cstrong\u003e12.5:1\u003c\/strong\u003e for harder hit, stronger midrange, and top-end pull—whether you’re chasing holeshots or carving technical trails.\u003c\/span\u003e\u003c\/p\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e📦 What’s Included\u003c\/h3\u003e \u003cp style=\"text-align:center;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eRace-ready components, brand new in original packaging for a seamless install.\u003c\/span\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eBPRATV 98mm Big Bore Nikasil Cylinder\u003c\/strong\u003e – performance plated, built for heat control \u0026amp; durability (1-year warranty on cylinder*)\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eCP-Carrillo 98mm Forged Piston Kit\u003c\/strong\u003e – piston, rings, wrist pin \u0026amp; clips for precise sealing and longevity\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eCometic Top End Gasket Kit\u003c\/strong\u003e – MLS head gasket for dependable, high-pressure sealing\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eWorks with \u003cstrong\u003epump or race gas\u003c\/strong\u003e (tune as needed)\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eAll components are \u003cstrong\u003ebrand new\u003c\/strong\u003e and covered by manufacturer warranties\u003c\/span\u003e\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e⚙️ Performance Highlights\u003c\/h3\u003e \u003cp style=\"text-align:center;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eEngineered to deliver reliable power gains with OEM-plus fit and finish.\u003c\/span\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eDisplacement increase to \u003cstrong\u003e478cc\u003c\/strong\u003e for instant torque \u0026amp; throttle response\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003e12.5:1 compression\u003c\/strong\u003e for crisp low-end grunt and stronger mid\/top\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eForged CP piston for high RPM stability and durability\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eNikasil cylinder plating for superior wear and heat transfer\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eCometic MLS sealing to prevent blow-by and fluid leaks\u003c\/span\u003e\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e✅ Compatibility \u0026amp; Fitment\u003c\/h3\u003e \u003cp style=\"text-align:center;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eDesigned for Yamaha fuel-injected 450 sport quads.\u003c\/span\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eYamaha YFZ450R\u003c\/strong\u003e (EFI) – \u003cstrong\u003e2009–2026\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\n\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eYamaha YFZ450X\u003c\/strong\u003e (EFI) \u003c\/span\u003e– \u003cstrong\u003eAll Years\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eReplaces stock top-end with 98mm big bore components\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eCompatible with pump or race fuel (octane per tune)\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eProfessional installation and tuning recommended for best results\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: Do I need a tune after installing this kit?\u003c\/strong\u003e\u003c\/span\u003e \u003cp style=\"text-align:left;margin:0 0 10px 0;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eA: Yes—EFI mapping should be adjusted to optimize fueling and ignition for the 98mm\/478cc setup.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e \u003cli\u003e\n\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eQ: Will this work with stock head and valves?\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’s engineered to pair with a healthy stock top end; porting\/valve upgrades can add more gains.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e \u003cli\u003e\n\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eQ: Pump gas or race gas?\u003c\/strong\u003e\u003c\/span\u003e \u003cp style=\"text-align:left;margin:0 0 10px 0;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eA: Either. Many riders run premium pump gas with a proper tune; race gas is recommended for aggressive builds\/conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e \u003cli\u003e\n\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eQ: What is covered by the warranty?\u003c\/strong\u003e\u003c\/span\u003e \u003cp style=\"text-align:left;margin:0 0 10px 0;\"\u003e\u003cspan style=\"font-size:16px;\"\u003eA: Cylinder has a 1-year limited warranty from BPRATV; other parts carry the original manufacturer’s warranty.*\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? Your YFZ450R 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 This YFZ450R 98mm Big Bore Top End Kit reflects that commitment with proven brands, precise fitment, and real-world gains. Trust BPRATV to deliver the parts you need to keep your YFZ450R performing its best, every single time.\u003c\/span\u003e\u003c\/p\u003e\n\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\u003eInstall with confidence and feel the 478cc difference on your next ride! 🏁\u003c\/em\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align:center;margin:0 20px;\"\u003e\u003cspan style=\"color:#38761d;font-size:16px;\"\u003e\u003cstrong\u003e\u003cem\u003e\u003cbr\u003e\u003c\/em\u003e\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\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\u003c\/p\u003e \u003c\/div\u003e \u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: 0.000001px; color: transparent;\"\u003eBoost your Yamaha YFZ450R\/YFZ450X to 478cc with BPRATV’s 98mm big bore top end kit. Includes CP forged piston, Nikasil cylinder, and Cometic MLS gaskets. Reliable power, OEM-plus fit. Works with pump or race gas.,21003-1, M1009, C3178, C3178-EST, 20003, M1006, C7908, 71014-5, 2S2-11181-00-00, 3VD-14613-01-00, 94591-57120-00, 2S2-11311-30-00, 4FM-12213-00, 5TG-11631-12-00, 5TG-11633-10-00, 5TG-11631-21-00, M1002, 93450-22027-00, 2S2-11351-00-00\u003c\/span\u003e\u003c\/p\u003e","brand":"CP-Carrillo","offers":[{"title":"Default Title","offer_id":45077736489157,"sku":"286808633724\/21003\/M1009\/C3178\/JT","price":444.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0593\/1083\/3861\/files\/yfz450r-yfz-450r-98mm-98-478cc-cp-cometic-big-bore-top-end-cylinder-kit_39dd802e-9c1f-4da3-b98b-6bbe508e6f19.png?v=1757284834","url":"https:\/\/bpratv.com\/products\/yamaha-yfz450r-yfz-450r-478cc-big-bore-top-end-kit-3-cp-piston-cylinder-cometic","provider":"BPRATV","version":"1.0","type":"link"}