Secondary maybe 10K ohms, or more. The primary will only be an ohm or two, too low to measure accurately with a common multimeter.
Does this have breaker-points; have you chased that black to find out what it connects to in the crankcase? Where is the flywheel/magnet in that picture?
To me, "CDI" means "Capacitor Discharge Ignition", much more complicated than what appears in the picture, and much more expensive than justified for a small engine like this. Again, why do you think it is CDI???