SOURCE: Mixture screw on Carb
I believe it is near the bottom, around where the float bowl meets the carb body.. You need a straight small screwdriver (Short) facing upward.
SOURCE: Carb (Mikuni) flooding on Yamaha Vmax motor cycle
I had a similar problem. For the float needle there is a seat that it goes into, check this for dirt first, then if no dirt present, the brass part (not the needle but the part it seats into) has an o-ring where it mates to the carb body. If that o-ring is not tightly sealed it will allow fuel to bypass. I found o-rings very cheap at pep boys just take an old one with you to match for size. very cheap too. (under 5 dollars)
SOURCE: Fuel line issues on Yamaha Timber Wolf ATV
That was an atmospheric vent you found that should not have gas in it. If it does, the carb has over flowed. It probably needs to be cleaned with special attention paid to the needle valve and float assemblies.It is routed up high to prevent water and debris from entering it and clogging it up. It should have holes for it to pass through on the snorkel coming out of the air box behind the gas tank under the seat.
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