So I had a previous thread about gummed up carbs. Well I cleaned them up, soked them and put them all back together. I reinstalled them on the motor. Drained the fuel tank and lines, changed the plugs but the motor won't start. I made sure every passage way in the carbs were clean by blowing compressed air through each one. then installed the rebuild kits. I think the motor has good spark. If I spray some carb cleaner down the throat of the engine it'll turn over once but then dies.(I only did this once) I checked the drain plugs in the carb bowls and they are filled with good gas. Does the motor need to be primed in some way? Any help would be greatly appreciated.