Re. temp. difference, it's not a peculiarity of the XS650; Michael Morse pointed out to me that any air cooled parallel twin will run hotter on the primary side; it's sealed and gets less cooling. According to Michael, tuners used to stagger jet Triumph and BSA twin race bikes to compensate. Anyway, it is emphatically not something to be concerned about on a street bike.
The main vulnerability of your machine is going to be that breaker point ignition that got retrofitted onto your G. Be sure that the cogged nut that holds the advance unit on the camshaft is tight; lay into it with a hammer and drift.
There's no reason your bike shouldn't make the trip if you keep your eyes, ears, and wrenches busy. Have a great ride!
The main vulnerability of your machine is going to be that breaker point ignition that got retrofitted onto your G. Be sure that the cogged nut that holds the advance unit on the camshaft is tight; lay into it with a hammer and drift.
There's no reason your bike shouldn't make the trip if you keep your eyes, ears, and wrenches busy. Have a great ride!