How often do I need to set the ignition timing on my CB450 / CL450 / CB500T? Common Motor December 17, 2018 05:31 Follow Every 1,500 miles / 2,400 km. Related articles How often do I need to replace the ignition points on my CB450 / CL450 / CB500T? Honda CB450 / CL450 / CB500T Valve Adjustment & Cam Chain How do I synchronize the carburetors on my Honda CB450 / CL450 / CB500T? Comments 0 comments Please sign in to leave a comment.