Some of you are giving the 4t too much credit. When looking at lap times done by 250v250 comparisons I don't believe the 250f will run faster laps '9 times out of 10'. Most riders you see will have a faster lap on a 250, although the 250 will also run the slowest lap. The 250f is more consistent, and easier to ride. Not faster.
Yes i agree, but winning races means being able to string consecutive fast laps together.
I totally agree that i could turn a couple super fast laps on my 2t but it's hard to do that for a whole race ie the challenge i spoke of earlier.
4bangers are easier to ride, so you can ride at a faster pace for longer.
like i said this is boring to me but i can't deny it's the way to win races.
Also i do have a flywheel weight on the CR, it helped my starts heaps.
What rbigair40 mentioned about rolling a track and gassing on the face of a jump is also true in my opinion, it's one of the things that makes a 4 easier to ride.
A good example is at my local track a 450 is able to launch in 3rd and pretty much stay in that gear the whole lap, boring but fast. meanwhile i'm up and down gears and on the clutch, much more fun.