I started taking the motor apart last night so just need to get the magneto cover off? I’m pretty sure that it but the engine uses Phillips screws to keep it together and they are a pain because they strip
I prefer replacing all of those with either hex (allen) or flanged bolts after getting them all out.
If you had the exact year I could find you an exact wiring schematic and possibly parts manual of some form.
Another thing to check is that the HT is making good contact between the coil and cap...thread ins are nice but often are a pain for pulling loose especially with crusty old HT's
I did what looking I could on the machine in general without a year of reference and it seems the CDI is integrated as part of the coil so it is more likely a problem with the signal pickup, stator, or the wires between everything.
Apparently those have a dual kill... look some sort of pull string under the rear of the seat and make sure it's disconnected or missing entirely. It is a normally open contact switch so the wires being spliced together will ground the ignition out... don't do that lol.