Usually spitting and coughing back out of the carb is due to a lean fuel air mixture. I'd go up one size on the slow speed jet in the carb. Maybe raise the needle by putting a 0.020" (standard 3mm flat washer) under the needle in the slide. Remove the needle from the slide, put the washer on from the long end of the needle, and replace it.
The leak is another matter. Usually when the stock CV carb leaks, it's because the accellerator pump diaphragm has a hole in it. This allows gasoline to get on the top side of the diaphragm and then it comes up through the top of the hole that the pump push rod goes down through.
All in all, it sounds like it is time to have your carb rebuilt. A thorough cleaning INSIDE and out and a few parts replaced. That should cure your problems.
Good Luck
Steve
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