I think whats being refered to is that most small fractional HP motors have a start cap of 12 - 15uF, so if in doubt try one... the worst that will happen is hasn't got enough start torque to run....This assumes we are talking about a start capacitor and not a start/run... can you confirm that your motor has a centrifugal switch that disconnects the start cap once its about 3/4 speed.