So this past weekend after someone else brought up the topic, I asked about the legality of a Moriwaki 250s running in the class since a few have been in the MA region. Well apparently the whole "SuperBikes are based upon production models, sold by manufacturer and their dealers anywhere in the world for street use via normal commercial channels." really doesn't mean anything. And "Single cylinder, unlimited displacement, unlimited frame" means you can do whatever you want ala GP rules if it's 4-stroke single.
So going by this interpretation 125 and 250 2-stroke GP bikes should also be legal for this class since they meet "Two stroke, liquid cooled, up to 375cc" limitation, production model for street use requirement be damned.
I don't think I'm the only one that think a bike should have to meet all the class requirements to be legal, not just some of them.