If your moped hasn't ridden in a while, you can try removing the spark plug, clean it and put a soda CAP ful (1 teaspoon) of gas in the spark plug hole and heat the plug with a lighter for about 30 seconds and put it in immediately as its still hot and that should help. Also, starting fluid in the carb.
But be careful with the starting fluid... Don't put too much in. It could blow your engine head off.
Good luck... Hope you get it started.