ProX Piston Kit Yamaha YZ450F '03-09 / WR450F '03-15 Stock 12.5:1 95mm (94.97mm)

ProX Piston Kit 94.97mm 12.5:1 Yamaha YZ450F 2003-2009 WR450F 2003-2015

📖 Product Description

Upgrade your engine performance with the ProX Piston Kit 94.97mm, engineered specifically for Yamaha YZ450F and WR450F models. Designed using premium low-expansion piston alloy and precision CNC machining, this kit delivers consistent power, durability, and OEM-level reliability for demanding riders and racers alike.

🔥 Key Features & Benefits

Built to meet or exceed OEM specifications, this ProX piston kit ensures optimal combustion efficiency and long-lasting engine performance for off-road and motocross applications.

• Precision CNC-machined piston for superior fit and reliability
• 94.97mm piston diameter (+0.02mm) for exact bore tolerance
• 12.5:1 compression ratio for enhanced power output
• Low-friction, low-expansion alloy used by major OEM manufacturers
• Complete kit includes piston, rings, wrist pin, and circlips

✅ Compatibility

Designed as a direct OEM replacement using reference number 5TJ-11631-00, ensuring seamless installation and performance.

• Yamaha YZ450F 2003–2009
• Yamaha WR450F 2003–2015
• Bore Diameter: 95.00mm (OEM matched)
• Compression Height: 14.50mm
• Wrist Pin Bore: 18.00mm

❓ Frequently Asked Questions (FAQ)

• Q: Is this piston kit a direct OEM replacement?

  A: Yes, it matches OEM specs and replaces part number 5TJ-11631-00.

• Q: What is included in the kit?

  A: The kit includes piston, ring set, wrist pin, and circlips.

• Q: Does this improve engine performance?

  A: Yes, the 12.5:1 compression ratio enhances power and throttle response.

• Q: Is this suitable for racing use?

  A: Absolutely, it’s designed for high-performance and racing applications.

🌟 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 carefully selected to deliver unmatched reliability and performance for your Yamaha dirt bike. Trust BPRATV to keep your machine running at its best, every single time.

Upgrade your Yamaha today with this ProX piston kit and experience peak performance!

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.