HI i just got my sobre put together with all the servos s75, speedcontrol elfight 10amp, elfight 370, eflight 2 cell 800, and dx6i. When i first turned it on i tried to see if the motor had power it did so i went wide open and it pulled really hard them slowed and stopped after about a second, i had this same problem with the fiego in my buggy and it was the endbell spinning on the can does any body know what i need to do to fix this.

Sounds like your lipo is not charged, and you speed controll cut off the motor before you drained your battery too much. Try charging it

ii just realized i had the lipo cut off at 9 v when the lipo 2 cell at full charge was at 8.71v wow i feel really dumb for not catching that

You probably have the ESC set for 3 cells that's the default setting make sure you have it on two cell. Plus if you ever want to enjoy your plane at his full 3D capability you will need a 3 cell lipo.

Fernando