have you confirmed that you have a spark? take the plug out, connect it tot he coil and let it lay against the engine blaock while you are turning the bike over by hand with the kickstarter. coulda flowled out the plug. a weak spark is jsut as bad as no spark when it gets gummed up with oil.
if there is a spark, check your stator/flywheel next. its ont eh left side of the motor and it has like 7 screws that hold the side cover in place. once you take off that side cover you can see the flywheel. make sure its not spinning freely on the shaft and that the nut is tight. if its spinning freely, it means you sheared off your woodruff key and it needs replaced.