If you're certain you've got spark, and the carbeurator is passing fluid, that the reason for no-start would be that the float bowl is full of condensation, rather than fuel.
One way to check for this possibility, is to put a shot of ether into the intake, and if it pops, drain the carb out into a can for a minute or two, until what's draining smells like gasoline... then try starting it again... it'll probably go.
What frequently happens, particularly with ethanol blended fuels in vented tanks, is that the tank 'breathes' during fall and winter temps, and inhales damp air, which is then absorbed by the ethanol (ethanol is hygroscopic). Due to it's specific gravity being higher than hydrocarbons, it falls to the bottom of the tank, as well as displacing fuel from the fuel line and sediment bowl. By draining the bottom of the carb bowl, anything in the fuel line and sediment bowl gets cycled out, leaving the fuel ready to go.
Another important thing to realize, is that ethanol doesn't 'mix' with gasoline, it's in suspension. If you put a quart of ethanol blend in a bottle on your shop shelf for six months, you'll see it 'layer out'... where the bottom layer will be water, the next layer will be saturated ethanol, then ethanol, then gasoline on top. This is the reason why folks experience engine problems due to ethanol... when the ethanol layer gets drawn in, it's 100%... not 10%. Best to drain off the bottom into a can and give it another try.
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