Replace the float valve O rings as this is the most likely cause of flooding. Would be good practice to replace the main jet O rings at the same time. No need to change the Main Jets or Float valves as the spurious ones are not as good as the original.
These are the sizes I used
Use Nitrile (Buna-N) SHA75 to 90 or Viton® (FKM/FPM) SHA75 to 80
Nitril wokat lower temps and Viton at higher temp but wont make much difference in Carbs. Nitrile is a bit cheaper
Sizes, I measured
Float needle valve: 7.5mm ID x 1.5mm cross section
Main Jet: 5.5mm ID x 1.5mm cross section
Bought all mine here https://www.polymax.co.uk/o-rings/o-ring-selector/
These are the sizes I used
Use Nitrile (Buna-N) SHA75 to 90 or Viton® (FKM/FPM) SHA75 to 80
Nitril wokat lower temps and Viton at higher temp but wont make much difference in Carbs. Nitrile is a bit cheaper
Sizes, I measured
Float needle valve: 7.5mm ID x 1.5mm cross section
Main Jet: 5.5mm ID x 1.5mm cross section
Bought all mine here https://www.polymax.co.uk/o-rings/o-ring-selector/