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Since the bike is a 1981 and it is the right side carb you might have a bad diaphragm in the vacuum petcock which can allow fuel to bypass the carb and be drawn directly into the right hand cylinder.



The vacuum line runs from the petcock to the right hand carb, if you were to remove the line from the carb and it had gas in the line this would be the problem.



If the ports on the petcock and carbs have been blocked off and there is no vacuum line then someone has converted the petcock to manual and this would not be the problem.



Another thing that will cause a rich condition is if the rubber "hat plug" is missing from the idle jet tower inside the float bowl,,even if the plug is in place if it is not fitting tightly it could still cause problems.
 

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Gas flowing from the bowl drains is a sign that the either the floats are sticking down or bad ,,or there may be some dirt or crud in the float needle valve which is keeping the needle from seating properly,,you will probably need to remove the float bowls to fix this. This would also indicate that you do not have a vacuum petcock or someone has converted it to manual or it is not working properly. If the vacuum petcock was working properly no fuel could enter the carbs without the engine running.



It may be just as easy to remove the carbs from the bike and if you do this it would be a good idea to clean the carbs while you are at it.
 

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Do you know if you have a vacuum petcock? You would have a small hose running from the petcock to the right hand carb, another small hose routed down to the bottom of the bike and a larger line to supply fuel to the carbs if it is a vacuum petcock.



If your float needles are seating alright,,the floats must be sticking or are not adjusted properly if the drains leak when you leave the petcock turned on.
 
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