Carbs can not leak from the seam at the black cap in your picture, it would appear fuel is migrating downwards from your leaking petcock area.
I'd suggest to check that fuel delivery hose as well (may appear swollen and loose at the petcock fitting, hence the cable tie as an attempt to stop leakage?) and also all petcock related hardware to be sure...mounting, front and backside. If loose, don't go gorilla in overtightening. If everything tight and still leaking, a new petcock or a rebuild at very least is advisable.
“Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba....” quote Hunter S Thompson
Custom Carb Service
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Last edited by ducatiman; 10-19-2019 at 9:34 PM.