Why do you think you have to drain the carbs? What are you trying to accomplish with that?
When you put Stabil in the fuel, did you run the bike for at least 5 min to get that fuel from the tank down into the carbs? If you did that, there's probably nothing wrong with the carbs. If you didn't let it run for that length of time, that's a different story, but sitting only for 3 months, it should still start.
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