VALVE SPRING SET CRF450X 05-15, KIBBLEWHITE 30-31050 RACING, LIGHTWEIGHT KIT

This lightweight racing spring kit is engineered for high-performance use in Honda CRF450X models from 2005 to 2017. Designed for a 0.440″ valve lift, the kit includes chrome silicon valve springs, titanium retainers, and high-tensile steel lower collars. It provides optimal seat pressure and lift characteristics for both intake and exhaust applications, supporting the demands of high-revving 4-stroke engines.

Features

• Lightweight chrome silicon racing valve springs

• Titanium retainers for reduced valvetrain mass

• High-tensile steel lower collars

• Engineered for 0.440″ valve lift compatibility

• Optimised for both intake and exhaust valves

Specifications

• Exhaust: 0.440″ valve lift, 70 lb seat pressure, 183 lb @ 0.375″ lift

• Intake: 0.440″ valve lift, 40 lb seat pressure, 130 lb @ 0.375″ lift

Cross-Reference OEM Part Numbers

• Part No. 65-709

Vehicle Fitments

• Honda CRF450X 2005–2017