Took me bout 5 hours, but it is in. All I need now is a small elec fuel pump to draw fuel from the main tanks. I forgot that Robin engines don't have fuel pumps. I had to cut the cage down about 4 inches and remove the original 4 gallon fuel tank. The elec start works off either the twin batteries or the lawn tractor battery. I figure with both tanks full, I'm good for about 60 hours. Now I need to buy one of those transfer switches for the house, in case of power outages. So now, I have 12 volt, 120 volt and 240 volt in the ambulance. Now if gas prices would just go back down, I could afford to use it!!!!