Bob
Just throwing stuff up against the wall. Suzuki is the only Manufacture that makes a pretty good 750 cc motor for racing. Yamaha and Honda and Kawasaki seem to stay with 600cc motors. Why not grandfather the 700cc motors and set the limit at 600cc's. The heads are pretty good on the 600 motors the 750 Suzuki uses the same head I think. The cost of making a 600cc motor larger or 750cc motor smaller would probably double the cost of a stock 600cc motor and not add a lot to performance. Just Saying>>>>>>>>>>
Honest Dad himself
