why are 2and 4 strokes in the same class?

[RZ350]

Hopefully none of these rules will be changing anytime soon, I've been looking through all of my RZ350 parts, and I've come to the conclusion that I might have enough stuff here to build something somewhat fast!!

[panic]

"one crankshaft stroke below the oem cylinder deck position or that utilize oem pushrod length at least twice the crankshaft stroke"

Just a guess, but a good guess: the purpose was to block the pushrod class from pushrod engines better than yours, such as the Parilla "shoulder cam", and make it lose to Ducatis instead of beating Sprints.
Really cool for the Sprint and Ducati owners.
Not so good for those who try to make sense of the "rules".