OK well by the sounds of that I would be leaving the spark plug out, with the throttle in the run position pull the rop a good 10-15 times, cleaning the plug and reinstall. It could also be worth checking spark with the old plug, it is not entirely unknown to have a new one fail.
What engine is it exactly? For the purpose of a test, make sure the two kill wires are completely separated, and try starting, To stop the engine turn off the fuel (but since you cant stop it instantly with the throttle be very careful).
