It's easier to go faster on a modern 4 stroke, because they are modern first. Second, the tracks are made for them. Third, fuel changes made it harder for 2 stroke to make power. There are so many reasons. But these are facts of the current Pro series. Give us old rules, tracks with 180 turns, tone down sounds of 4 strokes, and a current bike and I'd say you are way off. Prime example is that of Cedric. The FIM has lower sound limits, the tracks are shorter of course, but have tighter turns, and he was on a current bike. He didn't do too shabby, right? One thing to remember also. Had the rules of 360cc 4 stroke against 250cc 2 strokes stayed like it had been since like 1970, we wouldn't be having this conversation. They changed to suite accomodate the 4 strokes.