the actual coil, and the coils on the stator can be tested with a multi meter, but we have seen those #'s be off and still work, or not ?
as mentioned, swapping parts is the easiest way, and the cdi (located under the hood) cannot be tested.
i like to check all connections of the wiring harness, and the kill/key switches first, get that hood off and unplug them one at a time to test.
here's the ignition troubleshooting pages from the manual posted:
88-02
http://www.blasterforum.com/threads/ignition-troubleshooting-88-02.46159/
03+
http://www.blasterforum.com/threads/ignition-troubleshooting-03.46160/