What is the spark plug gap for the CB550K / CB550F / CB500K? Common Motor December 17, 2018 05:54 Follow Gap specification: 0.6 - 0.7 mm (0.024 - 0.028 in.) Related articles What spark plug do I need for my CB550K / CB550F / CB500K? What type of fork oil and how much fork oil should I use in my CB550K / CB550F / CB500K? Comments 0 comments Please sign in to leave a comment.