Replace your leaky old fuel valves
with freshly made ones. This Italian made
flip over type is correct for Falcones,
Airones,and lots of other Italian bikes. The threads that go into the tank are the very popular 10X1mm and the fuel line side is 1/4" BSP threads.
NOTE: These petcocks are now in full production by OMG in Italy and this reflects the new lower price.