I never bother with the original tank and carby Mf ,you see tons of later Briggs thrown out ,just grab a later tank with the fuel primer and fit that , the good thing with the primer carby is when you run out of fuel completely you just fill the tank prime and start first time which is unlike the earlier carbs.
I can see some people wanting to keep ignition points and the original carby on an old Briggs mowers but it costs nothing to change them as there are always people giving away free Briggs mowers on Gumtree etc.
