Wow, that would also control the costs of engine builds because you wouldn't be able to built compression past the limit of 91 octane (keeping even more costs down). However, the exception list wouldn't sit well with riders in the small displacement classes (lightweight & middleweight endurance, lightweight grandprix, colorado class, modern vintage GTU & GTO, lightweight grand prix, novice GTU & GTO, amateur GTU & GTO, and middleweight superbike) where two strokes run with non-exempt bikes. If all superbike, ROR, and grand prix classes were exempt, it would only affect experts running super sport classes.

Hmmm...