Is it Possible that the float fuel seats, (i cant remember the name) the plugs that plug the gas when the bowl is full. Can those go bad and not be able to stop fuel flow into the carburetor?
ALSO are there any rebuild kits for these carbs? or is anyone selling their working one?
Yes to your question about the Floats and Float needle valves,
I've used the carb kits from Georgefix(great bloke),
There are two different sets of floats with their matching FNVs so what type are your floats either Black and Metal or White/Cream?
You need the correct carb kit to match.