So, I posted out to Freecycle in my area looking for treadmills. Got a hit! brought it home, opened it up, and found this:
Paul, Ben, and crew - is it worth anything, as far as go-kart size is concerned?
PERMANENT MAGNET DC MOTOR
Rotation: CW
Enclosure: Open
External Fan
90VDC, 1 HP SCR Controller 6 MPH
115VDC, 1.25 HP PWM Controller 8 MPH