My mower is four years old. It last ran six days ago - and ran well. when I took it out from it's shed and tried to start it nothing happened. I have taken apart the float chamber and there seemed nothing wrong with it. The plug did show a spark. petrol did drain onto the floor while it was standing - after I had tried to start the machine and the plug showed signs of the engine being flooded. There is nothing else that I can think of that would be of any use to you.