Your petcock might be in the wrong position, the "PRIME" position in particular. If it is just turn it to "ON" and no fuel should flow out of the tank unless motorcycle is running. that is if you have a vaccum diaphram petcock.
When the fuel level in the float bowl reaches a certain limit the floats float up and push a needle up blocking a fuel passage so no more fuel enters the float bowl. If too much fuel does enter the bowl it will flow out of the overflow on the bottom of the carb.
Now you may have a chunk of something preventing your float needle from seating and stopping fuel from entering the float bowl....or your float tang isnt adjusted properly also keeping the needle from seating.
So If fuel is flowing from your tank, your overflow is clogged, and your float needle is not seating the fuel will find another way out...Into your #1 carb because it usually sits lower then all the rest when the bike is on kick stand.
Here is my input on possible causes.
-Petcock on prime when bike isnt running. Or damaged petcock vaccum diaphram causing fuel to flow when it shouldnt.
-Float needle isnt seating (stuck open with crud, or not adjusted properly)
-Overflow is clogged.
I would check those things.
You usually have 2 main vents on the bottom of an airbox, a vent that takes gasses from the crankcase and mixes them in with intake air, You will also have an airbox drain. Just a tube at the bottom of the airbox that runs down behind the swingarm to drain any liquids that get in there.
Good luck
-Luke
82 Honda ATC 200-sold
82 Yamaha Virago 920-sold
82 Yamaha YZ250j-kept
80 Suzuki GS 550-sold
82 Kawasaki KZ550 A2-ride all the time
79 Kawasaki KZ650 C-sold
73 Kawasaki Z1 900E-paid $200, sold $6000
86 Yamaha Radian YX600-new project
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