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I've had this after a bike has been left and the Floats and Float needle valves needed cleaning as they have become coated with fuel Patina and or Alloy corrosion in and around the float needle valve hole.
Best take the carbs off and give them a bit of a clean and check the Floats and FNVs,
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Tim,
I have a new set of needle valves & float bowl gaskets, if you need them they are yours.