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Most likely, one or more of your carb floats has gotten stuck. The carbs have connected, so one sticky float will impact all the carbs equally. With the bike on the center stand, you can turn on the fuel petcock and see which bowl starts overflowing first, but that's not a perfect test.
The right way to correct this is to dismount the carbs and clean out the bowls and floats to ensure that everything is working properly. This would also fix the issue of having some dirt in the needle valve, preventing it from fully shutting off.
The sloppier fix that might or might not work for you is to leave the carbs in place and drop the bowls for the outer two carbs. When a bike is routinely parked on its side stand, I've found that the right hand carb, which has the lowest gas level and hence is a bit more likely to gum up. A dose of industrial strength carb cleaner (I like the stuff labeled "gum cutter") may free everything up--though you have to be careful that you don't damage or dissolve plastic/styrofoam floats.
your floats are sticking and overflowing out the back of the carbs.
your overflow tube in your float bowl must be clogged, otherwise the gas would run on the ground throught the drain tube.
Clean your carb really good and you shouldn't have any problems.
I recommend taking them apart and soaking everything overnight.
Take the jets out and the float&needle and soak the carb bodies, jets and screws.
After soaking rinse with water really well.
After rinsing, blow through every opening in the carb bodies, blow through each jet, and make sure you can see through them and through the little holes in the side of the main jet.
Reassemble and should work like new.
If your floats are still leaking, you make have to buy a new float needle valve.
Try the cleaning first.
As for the carb soak, you can purchase it at any local auto parts store for approx $22.00
Several things could be wrong. First, the fuel petcock (valve) at the bottom of the gas tank should be turned off when the bike is not being ridden. Also, it is possible the valve may not be fully shutting off the gas. This can allow the carb to overflow and leak gas. A stuck open or punctured float in the carb bowl can cause overflow. The float should be light as a feather and have nothing inside it but air. Is the carb securely mounted?
Check for cracked fuel hose or bad connections at the tank and carb. Is the fuel valve body leaking gas where it mounts to the tank? Heck, with the bike being 36 years old the tank may be leaking at a weld or due to rust through. I wish I could work on your bike. The older bikes are more fun to work on than the newer bikes. Post a reply and let me know what you find.
is it an overflow from the carb? gas will only be in one of 2 tubes and they are the fuel line from the tank and the carb over flow. unless you have an electronic fuel pump then tubes go from tank to pump to carb. if its coming from the overflow then you are getting too much fuel into the carb float chamber. you may have a sticky float. thy getting some Berrymans B12 fuel additive and putting double the doseage in the tank. run engine til hot then leave it to stand overnight. this should break down any gum/varnish that has built up in the system
sounds like you have either a stuck float or a needle and seat leaking your carb is overflowing and coming out overflow tube. could try adding a carb cleaner additive to your fuel but chances are you will have remove and clean carbs or replace needle and seat jim
The usual culprit is a blocked vent tube. Verify it's open. The usual
indicator is either a pressure release when you open the gas cap, or
a vacuum "sucking" noise when opening it first thing in the morning.
On a carb equipped bike, the carb overflow lines will leak, but in a
fuel injected bike like yours, it'll be out the overflow vent. The next
time it begins leaking, open the gas cap. It should stop immediately
as pressure inside is released. Good luck.