First of all listen for the click of the solenoid on the bottom of the carb bowl. If that is working, Then next spray some carb cleaner in the carb. It should start. I'm sure it isn't spark related because it is a twin cylinder with independent coils. If it starts with the cleaner then dies, it is probably a dirty carb from the ethanol in the gas sitting there. Probably have to pull the bowl at the least to clean it.