CRF450 motor Problems, HELP!!

[400MXer]

I'm having some problems with my '03 CRF450 motor. When i get it started it will idle fine, but as soon as i hit the throttle it spit's and pops and eventually falls on it's face and stalls. I thought it might have been something with the carb but i swapped the carb out with an extra one i had and it did the same thing. Then i swapped the CDI out with my buddies CDI (He has the same year CRF) and it did the same thing, then i swapped the Coil out with his, and again there was no change. Do you guys have any suggestions?

Thanks In advance.

[exrider008]

try playing with the jetting cuz thats what it sounds like. mine just did the same thing and it was to rich.