Ignition coil and wheel question
 

My coil is missing on my cub 100 are they the same as an old automotive coil?
Also on the Cub 100 wheel/rim is there a narrow front I would look for to put the narrow three rib tires on, and maybe same for the rear wheels for narrow Ags?

You can use an automotive coil as long as it has an internal resistor.

rims
 

standard narrow front rims that take the 4.00-8 tire will work with the 3 ribs