While I run up in class, 650cc-750cc, g-bg, I always start the year of in what class we are 650/G. Once I move that record up, I'll move up to a higher class. I have a couple of friends that are 750cc riders and it is a nice competition to push them. I even had one of them get a 650cc bike so he could push back. Man, that's racing, that's where it is fun, that's like side by side drag racing or 40 guy's on the track roadracing. The Chase for Speed is an awesome experience, but when you can throw some good one on one competition in it also. That makes for a fun weekend.
As far as tear downs you can look all day and find we are a 636cc and 998cc. I tend to believe that the cheaters are few and far between. They are theere, no doubt. That's the nature of life. I remember many years ago when Yamaha had an FZR Challenge series with the winner getting a 1 year factory ride. Jamie Hacking one that and became a well known figure in American Roadracing. I competed in the series. At the end of the 1st race the WERA officials impounded the top 5 finishers and did an unannounced teardown. This happened at all the regionals and nationals. Competitors were unaware it would happen. Everyone was found to be legal. I personally like the protest rule. We used it in roadracing. I had to pull my bike apart on 3 different occasions, but each time left the track with an additional $500.
I think a man I respect a great deal said it best in this thread. We don't own any record. Someone will come along and beat it. Best of luck to all in their next event.