Coming where from the bottom? If it's under the center, could be the rubber diaphragm in the auto shutoff valve or up front more, possibly a stuck carb float. Maybe even bad or cracked hose connections, fuel filter. Can you pinpoint a little better?
Possably a stuck float valve. I have tapedon the float bowl before and loosend them up, or maybe rocking the bike back and forth or let the gas run though and the float may reseat it's self. Put a pan under the bike to catch the gas.
Hopefully, you can at least see where it's leaking from, if you open the gas cover access door. Then once you determine where it's coming from, it doesn't take much to remove the top compartment housing the radio, to make your repair.