When you filled with gas did you set the petcock to prime and let it sit for about 5-7 min. then turn back to run. Then wait about 10-20 min. then try to start, prime lets gas flow into the carb to fill the bowl and let the vapors in, the seafoam will help. Empty carbs need some time to fill up.
See, it's always the simple things. This did it right up. I thought reserve and PRI were pretty much identical, but I guess not.
Just took her for an hour ride or so and everything felt nice. Still have quite a bit of spring sprucing do to on her. But at least she started up and sounded alright.
To answer other questions:
I'm pretty sure the battery is fine, may take it in to check out anyhow.
The plugs that are in there are currently Irridium plugs. When I first installed them they were fantastic, which is why I was gonna be miffed it was the plug. I expect it was just a case of two of them being pretty wet from an open float /stuck needle / whatever. (yay flooding).
Hyper, the filters in the ears were fine. Moist with oil, nice and greasy feeling, but not enough that it was leaking.
Thanks all. I'm sure I'll be asking about more problems soon enough.