How do you change fork oil in 98 Fat Boy?

To change the fork oil on a 1998 Harley-Davidson Fat Boy, start by safely lifting the front of the bike to relieve weight from the front forks. Remove the front wheel and brake calipers, then loosen the top fork caps and remove the forks from the bike. Drain the old oil by inverting the forks and allow them to fully drain, then refill each fork with the appropriate type and amount of new oil, typically around 11-12 ounces. Reassemble the forks, ensuring all components are tightened to specifications, and reattach them to the bike.