Either the float is stuck or the gas set up sticking the float valve in the open position. The best fix is to take the carbs off and apart, but if you are not easy with that, sometimes Seafoam in the tank will dissolve the old gas if ti's not too bad
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You need to pull of tne carb and just clean it i mean on the inside Take the floot bowl off its the four scerws on the bottem see how much drit is in the bowl this will give an idia of the condition of the intake air system dirty filter or mabey split air boot Get a can of carb cleaner with the little red spray tube with it The problem sounds like the NEDDLE VALVE that is the valve thats shouts the fuel off when the floots reach there highest point and shouts the fuel off to the engine if it is not sealing the engine would be flooded with gas all the time and cause this problem So take off the carb drain the gas flip it upside down take the scrwes out of the floot bowl save the gasket remove the pin that holds the floots it slides out the neddle valve is drectely under this DON;T start bending tabs just clean the valve and valve seat now sand paper paper towel and carb cleaner then spray throught every venturey you can from the out side in to clean Then reinstall and it will work like new carberators are alway the problem good luck
Where exactly is it coming from. Easiest way is to clean up the bottom and try and follow it up. The carbs have hoses that gas will leak from if there is a problem with them. A stuck float valve will cause your overflow tube to drip gas when the petcock is on. Also, if your gas tank is overfilled or on a hot day, sometimes gas can come out of that overflow tube as well. Figure out exactly where it's coming from first. Or take a picture, that will help. If it is the carb overflow tube give the carbs a good whack with a plastic handled screwdriver (a big one) and that may release the stuck valve and allow it to do its job, which is closing off fuel. Other than that, the only other cylindrical thing I can think of would be the brake master cylinder, which would also drip a clear-ish liquid, that resembles gas, but doesn't evaporate at all. It is essentially hydraulic fluid. I hope this helps.
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.
it's probably leaking from the carb and down the cylinder into the crankcase. it is probably due to a stuck float in the carb. take the float bowl off and make sure it is clean. the float can also be full of gas not letting it float up and stop the gas flow. the carb will fill up and leak wherever it can which is likely the case
the float pin is stuck or has some dirt in it. try tapping the side of the float bowl(s) with the handle of a screwdriver... not hard enough to break it. if that doesn't work you will likely have to take the carb apart and clean it.
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
Yes, it sounds EXACTLY like a stuck float. You may be able to fix it yourself depending on how accessable the offending carburetor is. Quite often you can free up a stuck float by setting up a bit of vibration. Give this a try > tap the side of the carb repeatedly using the plasitc end of a screwdriver. You are not looking to hammer the thing to death, just create minor shocks. The shocks / vibration will often free up a stuck float. Please rate this solution and let me know if all went well.
I'm new to the site and new to carbs. I bought a bike last week that had been sitting in a barn for a couple years the engine hadn't been running in over a year. I was able to get it running the first day after cleaning out the field mouse home occupying the air filter chamber and swapping the old gas for new gas. The bike ran and idled fine but the left carb (dual carb setup Keihin) poured gas from the tube coming out the bottom. I did some research and found out the floats may be stuck. I went ahead and ordered new floats and float bowl gaskets. I took the carbs apart apart as much as I could, using Berryman parts cleaner to soak all the metal parts I could get off. I put everything back together and put the new floats in yesterday. I started the engine and not only is the gas is still pouring out the bottom of the left carb, but now the bike is idleing very fast. The idle adjustment is backed out completely. When putting the carbs back together, I screwed all the jets back in all the way. I screwed in the Pilot Air screw, the one with the spring, all the way in, then backed it out 1 1/2 turns. Not sure if this has anything to do with the idle. As far as the floats go, does it sound like I need to replace the float valves too?
,The seats on the jets, or the o-rings on the needle valves that the floats control are probably leaking.,,,