Ahhh......it is indeed not enough! As I adjust the inductor (ie variac) the voltage continuously drops! NO resonant rise. I thought 4uF was enough? the motor is .3A at 7.5W....other's have had sucess.....
Maybe I should change the inductor...I'm sick of changing the cap! I might try a simple light dimmer from Lowes.....but if I have to, I'll go with another cap...
I don't think the light dimmer will work. Another variac may help. There may be some interaction there. You could try about 6 or 8uF for the cap.