OK as promised I have spoken to SEBO Technical and they said:
Two years ago last January so January 2011 the SEBO Dart had too many problems with the Ametek motors going. SEBO made the decision from January 2011 to fit the Dart with a new Motor made by Siemens. Since then they have never had a single motor go Worldwide unless it was through water damage!
Therefore for those of you that have a SEBO Dart which is relatively new and the Motor has gone if you e mail me the serial number SEBO are prepared to send me replacement Siemens Motors which I will fit free of charge.
So now you have no excuse if you have a Dart with a problem unless the motor went through water damage!
Now that's Service
Kev Martin
Marblelife Ltd
Tiling Logistics