Wiseco WB1165 Bottom End Gasket Kit for 2003-2006 Yamaha WR450F

The Wiseco WB1165 is a complete bottom end gasket kit engineered for the 2003–2006 Yamaha WR450F. Built to meet or exceed OEM standards, this kit delivers the premium materials and precision manufacturing Wiseco is known for, giving you everything needed to seal up your bottom end rebuild with confidence.

Key Features:

• Premium gasket materials that meet or exceed OEM specifications, ensuring an exceptional seal across all critical mating surfaces
• Double-forged connecting rod featuring shot peening, oil slots, and coated bronze thrust washers for durability under high-RPM stress
• Bushed top end rod for superior oil retention and elimination of wrist pin galling
• Case-hardened rod bores to 58–62 RC Rockwell hardness for an optimized bearing running surface
• High-quality crank pin bearings manufactured from hot-rolled steel, case hardened to 58–62 RC for extended service life
• Caged needle roller bearings designed for maximum possible RPM capability
• Corrosion-resistant surface treatment on components to prevent pitting and corrosion during long-term use or storage
• Case-hardened main bearings manufactured to the highest quality standards for smooth operation and long service life at high RPMs

The Wiseco WB1165 bottom end gasket kit is a trusted choice for dirt bike engine rebuilds, providing OEM-surpassing quality in a single, convenient package. Whether you're restoring or refreshing your WR450F's bottom end, this kit ensures a reliable, long-lasting seal from the first installation.