Description The DEF Racing 2017-2026 HONDA CRF450R Valve Spring Kit allows your engine to run at higher rpms, and with more aggressive cam profiles without the loss of valve control. This kit is a must for those using big lift cams and larger valves! Performance MAX RECOMMENDED EXHAUST LIFT @ 0.430″ / 10.92MM MAX RECOMMENDED INTAKE LIFT @ 0.465″ / 11.81MM Allows for a higher rev limiter Improved valve control and reduced reciprocating mass Kit Includes Exhaust Valve Springs (Dual Springs) Intake Valve Springs (Dual Springs) Titanium Exhaust and Intake Spring Retainers Tool Steel Spring Seats Related