buy a pump and drain tank only, do not run dry if it's fuel injection
for wire harness maintenance
If it is an EFI model it is inside the fuel tank.
1999 Harley Davidson fuel line diagram
The fuel capacity of a 1997 Harley-Davidson Heritage Softail Classic is approximately 5.0 gallons (about 18.9 liters). This includes a reserve fuel supply, which allows for extra mileage when the main tank is low. The bike's fuel system is designed to provide a balance of performance and cruising range.
Acronym Definition FLHRCI Harley-Davidson Road King Classic (fuel-injected)
If I am not mistaken, all 2007 Harley Davidson's were fuel injected and would not have a carburetor.
Just about any quality 20W50 motor oil will work, but Harley recommends either their own 20W50 Syn3 or their fossil 20W50 oil, both made by Citgo.
You have to put it in the fuel and leave it there. Your welcome
It is carburated and not Fuel Injected.
carburated
Full Length Harley RoadKing Injected ( fuel injection instead of carb)
1995