[TrevorG]

Yeah. Having just worked on this exact issue myself, the one on the top going out over the air box is just an overflow line, and the one in the back of the throttle with the widened end is a vacuum line that attaches to a nipple in the back of the petcock. If it is a leak, it will be from one of the rubber boots attaching the carb to either the airbox or the engine, or it will be from that line coming out the back going to the petcock.

I solved my problem by pulling the carb and giving it a good cleaning, then spending extra time making sure the carb was properly seated in the two rubber boots on either side and clamping those suckers down TIGHT.