I've had similar issues the last couple years. Winterized with Sta-Bil, and didn't drain the float bowls.
It took maybe 5 minutes of intermittent cranking for the engine to finally catch - make sure you have the choke all the way on, and DO NOT blip the throttle until it starts to warm up... blipping the throttle will kill the engine. And it probably goes without saying, but don't hold the starter button for longer than a couple seconds at a time.
I presume it's just a function of getting the gas back into the parts where it's supposed to be, because the bike runs just fine once she starts up and gets warm. The first cycle is going to need a longer than normal warmup - I don't know if that's the Sta-Bil or the prolonged rest. Once I get a half gallon of gas out of the tank, I'll add a dose of Techron and she'll be fine for the year.
EDIT: I am unshimmed and it's ~45* F, so it's normally a difficult start. The first start of the year is always even more of a bear, though.
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