[kheft]

Well, looks like they change a bit to the motor. Almost a completely different powerplant. (Crank case wise)
Dirtbike
[attachmentid=15]
Quad
[attachmentid=16]

 

[KFX450HQ]

Here's an expaned view of the motor, you can see a bit more.

[attachmentid=18]

I think it will be similar to the KX450F motor, but not identical, just like the LTR450's motor to the RMZ450's.

 

[cyberjwalk]

Obviously having EFI and reverse is going to change the look of the motor.

 

[quad_runner]

Man I hope they keep the same powerband. The KX450F has sik power.