.... I have a Mercury 500 Thunderbolt ignition 50hp motor S/N 4361254 with dual carbs. I want to clean and rebuild these BA3A carbs. I only find gasket and fuel pump rebuild kits for BA3B,BA3C and BA3D carbs. Can someone tell me if all BA3 series gasket and fuel pump kits are interchangeable? Whats the deal here?
