Is it possible that the pulley on the motor is larger than needed?
The tempo had been too fast and the music too loud.  Without knowing
other factors such as extra instruments, both the speed and loudness
might be corrected with a smaller pulley on the motor.  But the failure
to start up normally and the overheating are scary and dangerous.
A motor shop could probably fix it.

Bill Chapman
La Quinta, California - where the temperature is already 94 deg. F.

 [ New "Air Over" motors will operate at 150 deg. F. case temperature and
 [ will shut down automatically if the temperature exceeds 150 degrees.
 [ -- Robbie