Kodiak 400 Grizzly 400 YFM400 Top End Rebuild Repair Kit Wiseco Piston Gaskets

Yamaha Kodiak 400 Grizzly 400 450 YFM Top End Rebuild Kit 84.50mm Wiseco

🔥 Complete 84.50mm Stock Bore Top End Rebuild Kit

Restore the power and reliability of your ATV with this Yamaha 400 / 450 Top End Rebuild Kit featuring a BPRATV cylinder, Wiseco forged piston, and Vertex / Moose Racing gasket set. Designed as a direct bolt-on solution for stock bore 84.50mm applications, this kit delivers dependable performance, improved compression, and long-lasting durability at a fraction of OEM cost.

💪 Premium Components for Maximum Performance

Engineered for riders who demand reliability and power, this kit combines high-performance internals with OEM-quality fitment. Whether you're rebuilding after wear or upgrading for stronger throttle response, this setup delivers race-proven durability and 11:1 compression performance.

• BPRATV 84.50mm Stock Bore Cylinder – Brand New (1-Year Warranty)
• Wiseco 84.50mm 11:1 Forged Piston Kit (Piston, Pin, Rings & Clips)
• Vertex / Moose Racing Top End Gasket Set
• Includes Viton Valve Stem Seals for superior sealing
• Direct bolt-on stock bore replacement – No machining required

✅ Yamaha 400 / 450 Compatibility

Precision engineered to fit the following Yamaha ATV and UTV models with 84.50mm stock bore engines:

• Yamaha Grizzly 400 (2007–2008)
• Yamaha Kodiak 400 (2000–2006)
• Yamaha Grizzly 450 YFM450 (2007–2016)
• Yamaha Kodiak 450 YFM450 (2003–2024)
• Yamaha Rhino 450 YXR450 (2006–2009) & Wolverine 450 YFM450 (2006–2010)

❓ Frequently Asked Questions (FAQ)

• Q: Is this a stock bore kit?

  A: Yes. This kit is designed for the stock 84.50mm bore size and installs without modification.

• Q: Does the piston increase compression?

  A: The included Wiseco forged piston features 11:1 compression for improved throttle response and torque.

• Q: What is included in the gasket kit?

  A: The Vertex / Moose Racing kit includes premium top-end gaskets and Viton valve stem seals.

• Q: Is there a warranty?

  A: Yes. The BPRATV cylinder includes a 1-year warranty for peace of mind.

🌟 Why Buy from BPRATV? Trusted ATV Engine Experts 🌟

At BPRATV, our promise is unwavering: The Best Parts. The Best Performance. We carefully source and test every component to ensure maximum durability, power, and value. Trust BPRATV to keep your Yamaha Grizzly, Kodiak, Rhino, or Wolverine running at its best, every single time.

Upgrade Your Yamaha 400 / 450 Today – Restore Power & Ride with Confidence!

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

BRAPPPPPPPPPP!

© BPRATV LLC

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. This product is sold only for use in connection with EPA-certified, purpose-built, nonroad vehicles used solely for closed-course, nonroad competition/racing.