If i leave my Hobbit sitting around for just a few weeks it won't start or maybe it won't idle.. If i clean the carburetor it's fixed. I think the gasoline deteriorates and clogs small passages in the carb.
I doubt the ignition has a problem.. they don't get weak with age in storage. But a few failed attempts to start can foul the plug.. or the plug is gone and needs to be replaced anyway..
So that's what i'd do.. get a brand new plug and test for spark..
Then spray some Starter Fluid into the air intake (little 3-holed rubber spout near the left-front of the airbox) If it starts the carb is clogged.
May as well give the whole bike a good looking over and a tuneup while you're at it.