I'll take a stab at it. First make sure you have oil in it. Many motors have a low oil switch that will kill the motor on low oil.
Second, I am not sure what that motor has for a ignition system but I will assume it is the standard type. IE a magnet on the flywheel, it spins around and causes a rapid change in the coil. The coil can be bad. (The coil has the sparkplug wire coming out of it)