Kibblewhite 80-80950 Lightweight Valve Spring Kit Intake Only 0.380" Lift Yamaha

The Kibblewhite 80-80950 KPMI Lightweight Valve Spring Kit is engineered specifically for intake valve applications on Yamaha YFZ450, YFZ450R, YZ450F, and WR450F models. This high-performance spring kit is designed to support up to 0.380" of valve lift, making it ideal for performance camshaft upgrades and high-RPM applications.

Key Features:

• Premium chrome silicon dual valve spring design for superior durability and performance
• Lightweight titanium retainers reduce valvetrain mass for increased RPM capability
• Heat treated, stress relieved, and shot peened components for maximum reliability
• Engineered using proprietary design and simulation software for optimal valvetrain control
• Reduces valve float at high RPM and during extended operation
• Complete kit for intake valves on one engine

Kibblewhite's "system" approach ensures each component is optimized to work together, taking into account cam profiles, harmonics, natural frequency, valvetrain mass, and engine RPM. The chrome silicon spring wire is traceable to premium Japanese manufacturers and undergoes rigorous quality control processes. Kit includes springs, titanium retainers, and necessary installation hardware for professional-grade engine builds.

Note: Sunk valve guides may be required when using higher lift camshafts. This kit is designed to work with Kibblewhite valves and components for best results.