What fuel should I use in a CB550K / CB550F / CB500K? December 17, 2018 05:51 We recommend premium (92+ octane) fuel; if it can be found non-ethanol fuel as well Related articles What is the carburetor float height for my Honda CB550K / CB550F / CB500K? What is the fuel capacity of a CB550K / CB550F / CB500K? Honda CB500 and CB550 4-Cylinder Factory Service Manuals What are the carburetor stock size jets for my Honda CB550K / CB550F / CB500K? What size tires do I need for my CB550K / CB550F / CB500K?