Fuel coming out the carb over flow hose

I'll second that, your float is stuck or the float needle is unable to seat. The fuel probably turned to lacquer while it sat. When the float needle is unable to seat (close) fuel continues to flow and overflows through the vent tube.

I would drain the tank while you're at it since there could be some sludge there that will eventually make its way to the carb. The carburetor bowl and float area should be flushed with clean gas or fuel injection spray cleaner. Don't use carburetor cleaner as it is too strong for the soft parts such as the accelerator pump diaphragm. Sometimes the safest cleaner is gasoline itself. I put some in a spray bottle for cleaning, just be careful that the bottle doesn't get used for anything else.

i agree, the gas turned on ya. next time ya leave it set, either drain the whole system or add some stabil to the gas as per bottle directions......

You might consider changing oil, if you were overflowing gas out of the overflow chances are you might have drained fuel back into the motor, especially if you are using an aftermarket petcock like Pingle.

Stock vac operated petcocks pretty much stop that problem when the bike is not running, ie no vac.

But the non vac pingles can overflow while the bike is not running, good ol gravity works. Bike leans left so fuel goes down the cyl.

JMO drop the bowl, clean, make sure the floats working and at proper level,
blow out the jets w/compressed air.

it can, either you'll find a ton of gas on the floor or in the bike
or it won't flow anything..

I'd at least check the oil to be sure you are ok..