Not that I am aware of. These motors are pretty much bullet proof if you just keep good oil in them. The occasional valve check should be done as well, but I have not read any horrific stories about burnt valves. Mine is pretty close to needing the valves looked at, so I will post my findings when done.
Looks like the weather in AR is not looking very good for the next few days may tear into it and check them out this weekend.
I did however check the plugs last week, and they looked great.
I will say my bike has 7k miles on it and the Air cleaner was pretty dirty, and a big butterfly was stuck to it.