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Seeing as how the cap is pretty cheap. I don't think you'll go wrong by building a grinder around that motor. If you want a bigger motor later, it's not gonna be out of the question. I use a 1/2...

I think I'd go to a Leeson website if I were you. You can probably type in the serial number of the motor, and they'll spit out the info you need. Or call your local HVAC guy and he might be able...

I wish I could help. But all my books just say to replace it with the same size capacitor as the one that's bad. lol. Just for my own curiosity: What'd the motor come out of?