The original thread was posted from Kuwait, which is 50 Hz. So RPM sounds right. What is the failure mode of the capacitors? Are you sure the motor doesn't have a problem? If the original cap failed to ground the motor's auxiliary winding would have been damaged. First thing I would do is read voltage across this capacitor while the motor is running. The proper voltage should be about 400. And be sure it's the right capacitor. Running caps are most often oval and in a completely sealed aluminum can, which may be covered with paper. Starting capacitors are usually round and the terminal end has a pressure relief vent since they are electrolytic.
Ichabod
