Help! Onan 4K generator refuses to start and stay on

Here I go again. Am at home now and I tried the generator again. It started, but only for about 15 seconds and then shut down. During this short time it ran rough and the exhaust blew constant blue smoke which I assume is excessive gas. As I stated before I did take the carb apart an soaked in cleaner and blwe air thru all the holes. So, where go I go from here?
Should I be replacing the carb or pull the carb entirely from generator and soak it in carb cleaner. Nothing seems to work.