06 banshee magneto has power but no spark at plug?

The magneto has 2 separate outputs - 1 to the ignition and 1 to the accessories (AKA Lights). If you are sure that you have power coming from both parts, then you need to check your switches (On/off switch and Key Switch).

If they test OK, then check your spark plug wires for continuity. If that is OK, then you need to check your coil (There are coil tests on youtube).

If your coil is functional, then the last thing to replace is the CDI. Unfortunately, there aren't any tests for that. It is either good or bad. You can and should check the pickup gap for the CDI - (Distance between the pickup and the flywheel at a predetermined point - typically a thicker or raised point on the flywheel).