Drawing of the motor is HERE.
3D model can be obtained HERE.
12v, 50 RPM, 4.4 ft-lb, Sprocket #35
Sprocket Standard: ANSI/ISO #35 to fit roller chain #35 (Pitch 3/8", Roller Diameter 0.200", Roller Width 3/16")
Sprocket Thickness: 0.168"
Sprocket Number of Teeth: 10