What is the spark plug gap for the CB450 / CL450 / CB500T? December 17, 2018 05:13 Gap specification: 0.7 - 0.8 mm (0.028 - 0.032 in.) Related articles What spark plug do I need for my CB450 / CL450 / CB500T? Honda CB450 / CL450 / CB500T Factory Service Manuals How do I set the ignition timing on my CB450 / CL450 / CB500T? How to change the oil on the Honda CB450 / CL450 / CB500T Check our general maintenance section for more topics!