if it's leaking out the air cleaner, the needle valve may be stuck. turn off your gas valve at the tank & remove the fuel bowl. the needle valve shuts of the fuel to the bowl when the float rises to the top. Sometimes you'll get some grit in there that will prevent the needle from shutting off the gas flow. then gas will overflow & leak everywhere. hope these pics help.....keep us posted.
okay...let's take this puppy apart
here are a couple views of the brass slide/needle & float/bowl
full choke
no choke
assembled pic of slide/needle
cable removed. note the funny slotted washer, must be on top of the needle and clip. this allows the spring to return the needle down.
here you can see the needle valve assembly.
thanks to Tom in WV for the following quote:
Think of it as a tiny toilet bowl . when you flush (open the throdel) the float alows more water (fuel) in to replace whats been used. The purpose of the float mechanisem is to keep the toilet from overflow (flooding)It only lets in whats needed as its used up. The toiled is remarkably similar to the carb except that the carb is variable speed and the toilet is all at once. This could be under the heading of "strange but true"