The Story
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
Description
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
