The Carter RBS carburetor is a type of carburetor that is used on many different types of engines. If your Carter RBS carburetor is flooding, it means that it is delivering too much fuel to the engine. This can be caused by a number of different things, including:
The float level is set too high: The float level is a measurement of how much fuel is allowed to enter the carburetor. If the float level is set too high, it can cause the carburetor to flood.
The float has a leak and is sinking from too much weight.
The needle and seat are not functioning properly: The needle and seat are responsible for regulating the flow of fuel into the carburetor. If they are not working properly, it can cause the carburetor to flood.
Test the needle & seat by blowing into the inlet with the needle closed. You should not be able to blow through. The RBS needs to be upside down for this test.
The fuel pump is not functioning properly: Get a fuel pump pressure tester and see if the pump is putting out more than 4.5 lbs. New pumps are especially suspect. There is the option of installing a regulator between the pump and the carburetor.
To fix a flooded Carter RBS carburetor, you will need to determine the cause of the flooding and address it. This may involve adjusting the float level, replacing the needle and seat, or repairing the accelerator pump.