The first thing you should be doing is, take all the grounds off, clean them then reinstall with a good anti-corrosive, this includes the battery and don't forget the one on the front behind the headlight housing. If your not having any issues with the battery it should be o.k., make sure to put it on a battery saver after each use. These bikes don't like short runs since it takes a lot out of the battery to start them. Most of us use the Big Crank batteries, they're made by Deka in PA.
I would also change the fluids, engine oil, primary oil, brake fluid, which is pretty easy to do. Definitely check the front and rear bearings, if you can get the wheels off the ground d and spin the wheels, make sure they spin smooth with no grinding noise.