Hi Huddie , i echo the ideas of the others . Having had the same thing happen to my P&J , Re the plugs I'm told this supposed "Petrol " in reality ethanol based muck damages the plugs after they have become wet , i had my car flood at Christmas and had to change them to get it running again. Wide open throttle is exactly the right procedure for a flooded engine and was used on both cars and bikes in days of yore . If still problems remember that it can only be 3 things ,electrical :- timing l ,sparks and magneto, mechanical :-,does the engine have compression ,did it stop with bang and are tappets adjusted properly etc fuel:- carb:-kneedle still held by clip, jets clean ,fuel lines do you have a filter in the line,my monies on new plugs curing it but look forward to hearing exactly what you find,regards BobH