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Best Seller Honda Trx400ex / 400x 440cc Big Bore Top End Kit – 89mm +4mm Best Choice [RWhygDP3]

$60.99 $195.99 -69%

Honda TRX400EX / TRX400X 440cc Big Bore Upgrade KitAre you ready to take your Honda TRX400EX or TRX400X to the next level? Our 440cc Big Bore Top End Rebuild Kit is designed to provide a powerful and efficient upgrade for your off-road adventure. Thi

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Honda TRX400EX / TRX400X 440cc Big Bore Upgrade Kit

Are you ready to take your Honda TRX400EX or TRX400X to the next level? Our 440cc Big Bore Top End Rebuild Kit is designed to provide a powerful and efficient upgrade for your off-road adventure. This high-quality kit includes all the necessary components to increase your engine's displacement by 89mm +4mm, delivering superior performance and enhanced power output.
  • Increased Displacement: The 89mm +4mm stroker kit increases your engine's displacement, resulting in more power and better acceleration.
  • High-Quality Components: Our kit is made with top-grade materials to ensure durability and long-lasting performance.
With this kit, you'll experience improved throttle response and increased torque, making your ride more enjoyable and efficient.

Key Features and Specifications

This comprehensive rebuild kit includes all the essential parts needed for a seamless installation. The kit features a high-performance cylinder head, pistons, rods, and rings, all designed to work together for optimal performance.
  • Cylinder Head: Our cylinder head is engineered to provide maximum airflow and increased compression, ensuring efficient combustion and enhanced power output.
  • Pistons and Rods: The high-quality pistons and rods are designed to withstand the increased pressure and heat generated by the bigger bore, ensuring long-lasting performance.
This kit is compatible with both the Honda TRX400EX and TRX400X models, making it a versatile choice for any off-road enthusiast.

Practical Uses and Benefits

Whether you're tackling rugged trails or participating in off-road races, this 440cc Big Bore Top End Kit is the perfect upgrade for your Honda TRX400EX or TRX400X. The increased power and performance will make your ride more enjoyable and give you the edge you need on the trails.
  • Improved Performance: The enhanced power output will provide a smoother and more responsive ride, allowing you to handle tough terrain with ease.
  • Enhanced Durability: The high-quality components are built to last, ensuring that your engine stays strong and reliable for years to come.
Don't settle for an average off-road experience. Upgrade your Honda TRX400EX or TRX400X with our 440cc Big Bore Top End Kit and enjoy the benefits of increased power and performance.

What Our Customers Say

January 2, 2026

Absolutely no complaints!

An outstanding tool. It feels extremely so premium.

- Dilwen I..

January 2, 2026

Absolutely no complaints!

I'm happy with the product, it is so very great.

- Carwyn H..

January 2, 2026

Absolutely no complaints!

I am super, super, super, super happy with my purchase.

- Seren Z..

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