1983 Yamaha Riva 180 no spark problem

[jburtonrider]

I was working on getting my Riva 180 that I picked up for $100 and I pulled the carb, cleaned all the jets, checked all the lines and put a new battery in. At first I was getting spark so I thought I was good, then there was a freak 10 minute rain/hail storm in my town and the scooter got exposed. Now I get no spark. I test the voltage coming from the end of the spark plug coil wire and it's reading 12V and when I turn over the engine, it drops about a volt.

I think the TCI ignitor unit might be dead. Anyone have any tips on how to test this or fix the problem altogether? Or any other suggestions that I might not have thought of?