Thanks for the update.
The very first thing I do when I buy a used scooter, car, truck, lawnmower or anything else with a gasoline engine is to change ALL fluids, filters, plugs etc. [Then as you said, I know what's in it and how long it's been in it. ). You done good. Now go enjoy that Ultra.
Edited to add: let us know how she's doing after a couple rides and a few hundred miles.