How often should I change my front fork oil on my CB550K / CB550F / CB500K? December 17, 2018 05:58 Every 5,000 miles / 8,000 km or once a year, whichever comes first. Related articles What type of fork oil and how much fork oil should I use in my CB550K / CB550F / CB500K? How to rebuild the Honda CB500K internal spring with dampening rod forks How to rebuild the Honda CB550K & CB550F internal spring without dampening rod forks How often do I need to clean or change the oil filter on a CB550K / CB550F / CB500K? Honda CB500 and CB550 4-Cylinder Factory Service Manuals