newbie question

[seeingreen]

What classes can a 600 superstock and sv650 superstock bike run.  

Also, is there a supermotard class and if not what class do they run?

[tzracer]

A supersport SV can run in all lightweight classes and above.
A supersport 600 can run in all middleweight classes and above.
There is no supermotard class, but singles can run in various classes - consult the 2004 rule book. Go to http://www.formulausa.com/forms.asp
click on FUSA Competition Rule Book to download the rule book. Consult chapter 6.