Bikes that have been sitting will mess with you pretty good. All four of mine (and my motorcycle) have done the start-a-few-times-then-unexpectedly-develop-spark-or-air leaks thing. Go through Fred's Guide here under the Wiki if you haven't already. Nothing will serve you better than taking care of the fundamentals just in case you will need to diagnose something more complex. Hang in there, that's a cool little bike. It will be worth the trouble.