YFZ450R YFZ 450R Wiseco Pump Piston 98mm BIG BORE Cylinder Top End Rebuild Kit

YFZ450R 98mm Wiseco Pump Gas Big Bore Cylinder & Top End Rebuild Kit

Unleash BIG BORE Performance

This complete top end rebuild package features a premium Wiseco 98mm Pump Gas Big Bore Piston and BPRATV Nikasil Cylinder, delivering exceptional reliability and horsepower gains for your Yamaha YFZ450R or YFZ450X. Built for riders who demand stronger torque, faster acceleration, and long-lasting performance.

🔥 Key Features & Benefits

Engineered for maximum results using the highest-quality components in the industry.

• BPRATV 98mm Nikasil Big Bore Cylinder – strong, lightweight, race-ready
• Custom Wiseco 12.75:1 Armor Glide Piston delivers major horsepower gains
• Complete Cometic Big Bore top end gasket kit included
• Kibblewhite red Viton valve stem seals (set of 5) for superior sealing
• Includes NGK Iridium spark plug for optimum ignition performance

✅ Compatibility

Designed specifically for fuel-injected Yamaha sport ATV models.

• Yamaha YFZ450R (EFI)
• Yamaha YFZ450X (EFI)
• Years 2009–2024
• Direct bolt-on with no machining required
• Compatible with pump or race gas

❓ Frequently Asked Questions (FAQ)

• Q: Does this kit require machining?

  A: No, this is a direct bolt-on big bore setup.

• Q: What fuel should I use?

  A: The Wiseco 12.75:1 piston is designed for pump gas but can also run race fuel.

• Q: Is the cylinder brand new?

  A: Yes, the BPRATV 98mm cylinder is completely new and comes with a 1-year warranty.

• Q: Will this increase horsepower?

  A: Absolutely — expect noticeable gains in power, torque, and throttle response.

🌟 Why Buy from BPRATV? Trusted Performance Experts 🌟

At BPRATV, our promise is unwavering: The Best Parts. The Best Performance. The Best Price. Every component we offer is tested, proven, and trusted by riders nationwide. When you want unmatched reliability and real performance gains for your Yamaha YFZ450R or YFZ450X, BPRATV delivers. Trust BPRATV to keep your machine running at its best, every single time.

Boost your YFZ450R’s power today with the ultimate big bore top end kit!

BPRATV - The Best Parts. The Best Performance. The Best Price.

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© 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.

This 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.