I just wanted to show how the Lama is looking with the new motors fitted:
Not much of visual difference I beieve.
The replacement itself was quite simple. It was only necessary to remove the canopy and the tail. Then unscrew the old motors and insert the new ones and fasten them. Make sure the motors are rotating in the correct direction before attempting any flight. Also let them run at low power for 15 minutes or so before flying to break the motors in.