If you're looking to start your engine on a moped but don't have an ignition key, there are a few methods you can use to get the job done. The easiest way is to remove the battery cap and use a screwdriver to pop the ignitor coil unit out. Be careful not to damage the coil unit or wires while doing this. Once it's out, Pry off the spark plug cover and use a flathead screwdriver to unscrew the spark plug. Finally, remove the wire from the spark plug lead and reattach it to the ignitor coil unit.