Does pushing the key while starting do anything? It sat for 8 months now it wont start. It has 2 prime starts and I've verified they both work. I hung a new fuel pump, soaked all 4 carbs in a gallon of gum out carb cleaner and it just wont start without ether. I've tried the air fuel screws at 3 1/2 turns, 2 turns, 4 turns, all different amount of turns. I dont know how to check the diaphragm assy that the schematic says is actuated by the "choke rod" , it has 4 vacuum lines that go to each carb. There is fresh gas and the bolls are full. All it did was sit . Does anybody have any suggestions? Thanks in advance