Fuel leaking outside carb and only when you start?
hmm mysterious, on a 1VJ l would admit the fuel pump stops fuel flow when engin switched off,,
What if you didn't have enough fuel in the carb to keep engin running from the moment it ignites,,
thats why you need to wait, not for engin to get cold but for carb to fill up again,,maybe
Try to exactly locate the leak
l do think the inlet valve could be stuck and
worn, letting a little fuel slowly poor thru
that would explain an overfill leak
Here's an easy check you can do before disassembling all the carb:
Check the fuel level in carb!
1 take a transparent fuel line
2 put it where the bleed line is fitted on carb
3 hold it straight up along the carb side like a "U" !
4 Open bleed screw and watch fuel poor "UP!" the line you re holding like a "U" against the catb side
5 lf level is correct, fuel in line should reach the same level as the upper end of the floater case: about where the screws keeps the
under part of carb tightened!!
NOT higher NOT lower !
6 lf good, empty fuel in carb and quickly remake the check to see fuel poors freely