Carb cleaner is a good first step. I suspect it could use a full cleaning.
Pull the vacuum line, the one on the right side of the carb with wire wrapped around it and check it for gas. It should be dry.
Try it in prime. This allows fuel to go the carb weather the engines running or not. So be sure to put it back to run when you turn it off. If this solves the problem, either you have a bad petc0ck or a leaky vac line.
Replace the vac line and pull the petc0ck and check the screen for obstruction.