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Re: gas coming from black tube
Hi and welcome to FixYa,
Initially and to my knowledge, some of the hoses connected to a carb would be:
from tank through fuel shutoff valve;
in some case a vacuum hose.
Of the above, the only possible hose that would fit your description would be the overflow hose. Should this be the case, then this indicates that the float inside the carb's bowl has not moved up to engage/close the inflow valve. A workaround is to tap the bottom of the bowl to jar the float to go up as well as the shutoff the inflow valve. The drain hose would also allow fuel to flow out from the carb but that would mean the drain screw is loose/opened.
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This happens when the float in the bowl sticks open. On a carborator the bowl holds gas. When the fuel pump fills the bowl the float raises and is pushing a needle valve that shuts off the gas until the float goes down and the needle valve opens and adds more gas. sometimes is sticks or the needle valve doesnt seat properly. You should rebuild it, buy a carb rebuild kit for your type of carb. It comes with new needle valves, just remember how it came appart. Good luck Robert
If it's leaking from the bowl drain, the drain screw isn't seating in the drain hole. Shut the gas off, pull it out and clean the tapered seat it seals in. I know you said you cleaned the carb, but if the float needle isn't seating, it would leak out the overflow and flood out the carb as well. Check out the float-if it's brass, shake it and listen for gas inside. If it's plastic, put it in a cup of gas and see if it floats. They do get saturated over time and need to be replaced. Good luck!
I am guessing you mean the little black box that holds the air filter. The box is the air filter housing. Chances are the oil level in the gearbox is too high. And chances are it is too high because the oil has a lot of gas mixed in it. The gas can come from compression getting past the rings or from the fuel valve on the gas tank not getting turned off when the bike is not being ridden or from a bad fuel valve letting gas pass even though the valve is turned off. A bit of the excess oil/gas mixture gets carried out the gearbox vent tube and into the breather chamber, (PVC valve), then into the air cleaner housing. I suggest you do an oil change and do it as needed to eliminate the problem. Alternate to that is a top end job for $750 or so. But first check the fuel valve to be sure it is working properly. Please rate my answer. Thanks.
sounds like you got a cracked gas line or it needs a clamp on it,1.if it a line running from each carb. that is the overflow lines.2.if its one big one coming from the breather box it is a catch holes, and you open it to let whats in it run out.
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.