I find that the plug lead near the head without a plug is the best way to clear a crank full of petrol. Of course after pulling the motor over for a while and watching the petrol shoot out. Once you get back to a very fine mist bring the plug lead into play and that then has the flame thrower effect and a if that doesn't clear all the fuel I then pull it over a few times and use my propane torch at the plug hole to get a whoof or two and this has usually burnt the excess fuel from inside the motor and you can then get on with getting the motor running again. You still have to be careful, but it still makes onlookers jump
