1976 johnson 35 hp model 35E76S runs 15 seconds and quits

[jamesfontenot]

I have been trying to get this old motor going for past several weeks. It's been sitting for 20 years. I changed the cooling system and cleaned the carb. Before cleaning the carb, the motor ran for a few seconds before quitting. After cleaning, it runs for about 15 seconds and cuts off. I've checked and there is no thermostat so I'll order one. I was thinking of also replacing the 2 condensers and 2 sets of points. Any ideas of why the engine quits after only short time running? Thanks to all who help me out.

 

[Bob_VT]

Have someone squeeze the primer bulb on the fuel line as it starts. I sounds as if you are not supplying fuel to the motor. You rebuilt the carbs......... did you check the floats for cracks? Just sounds as if it is starved.