How often should I change my front fork oil on my CB550K / CB550F / CB500K? Common Motor December 17, 2018 05:58 Follow 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? Parts That Will Need Replacement On A Vintage Honda Project Motorcycle aka The "Laundry List" How to rebuild the Honda CB500K internal spring with dampening rod forks Check our general maintenance section for more topics! How to rebuild the Honda CB550K & CB550F internal spring without dampening rod forks Comments 0 comments Please sign in to leave a comment.