GZ250 wont start

[Kief]

Let me start by saying I failed to drain the fuel last fall =( Started a couple times this spring to make sure battery was good etc. Exhaust was a little smokey. Started it last week and brought it down to driveway and changed oil and oil filter. Started it again, topped off oil once it circulated. Went for a ride and it stalled in under a mile. Got it back home started it once again, was choppy but ran a few minutes then stalled. Cant get it started again.

I attached 2 pictures one from the top after removing seat and cargo contained. You can see the hose coming from the carb that vents to under the seat. Also a side view from the right showing the hose coming out of the side of the carb. Slightly bigger then the other hoses coming out. I think this is a vent hose?????

When I try to start the bike now gas come dripping (rather quickly) from that vent hose and it wont start. I suspect the carb is gunked up by old gas??? Is that reasonable or should I be looking for something else. I am only slightly mechanically inclined so not sure if I want to try to clean it myself if that is even the problem. Any help/suggestions would be awesome! Thanks!!