Well, know the previous owner probably didn't do a thing in terms of maintenance. He bought it, put 200 miles on it, and stuck it in his garage for two years. All I have done is change the oil.
OK...my guess is that there is nothing wrong with your scooter.
Yes...change the engine and gear oil per the manual . Clean the oil screen. ..
Fo not overtighten ANYTHING as you go around checking sll the fasteners you can reach. Use the specified oils....
Check color of brake fluid...if dark have it replaced.
In a few 100 miles check the valve lash.
Sounds like you found a great ride!
2 year old fuel...well you're past that now....if it's running good then it's running good.
Don't be shy about asking questions....I asked plenty when starting out with my LIKE200I !!
Stig