2000 Miles on a 49 Grubee Starfire? Wow!
That's the engine I built this year and I've only got 600 ~ 700 Miles on it. (Running Great BTW!)
My Carb leaks and drips a lot. I'm not surprised if you may see fuel wetness in the Ignition cover plate. But I haven't necessarily had that cause a problem so far as I can tell. I've taken that cover off and dried it out a few times with Brake Cleaner to be sure that I'm not having a Spark concern.
But if you have 2000 Miles on your bike/engine... maybe the CDI is shot. I don't know for sure how to test that either, but at this point I'm pretty certain that you've already tried cleaning/replacing the Plug. And after 2000 Miles, I'd say that you have the Carb situation Well under control. (unlike me....)
Just me guessing here, but... I'd say that a new CDI would get you back up and running again.
2000 Miles. Wow. That's Great!