My generator won't start
This is actually a common problem today since most gasoline has added ethanol.  The ethanol creates all kinds of problems for small engines, particularly ones that site for long periods of time between uses.  The ethanol tends to attack parts of the carb, and also absorbs water.  Further, the ethanol and water will separate out in the tank over time.  The water, being the most dense, settles at the bottom of the tank where it is pulled out first.  On top of that will be a layer of ethanol, since it is the next most dense. Finally, gasoline will be floating on top of all that.  

Since you already flushed the bad gas, I think the carb is fubar and needs a rebuild.