The petrol is coming from the carburettor overflow because it is flooding. This is almost certainly because the float in the carb is stuck down, holding the needle valve that lets the petrol into the carb permanently open. Classic result of the bike being left standing and unused for a while (But by no means the only cause. Dirt in the fuel is also another classic cause of this problem). To fix:
1) Remove the carb from the bike, flip it upside down 2) Unscrew the (usually 4) screws holding the float chamber in place.
3) Clean everything out with clean petrol and, if you have access to one, a high pressure air hose.
4) Reassemble and refit.
5) Pray
Your float is stuck and allowing fuel to overflow. If the float, floats it checks off the fuel exactly like the tank on your toilet.
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