I have a 1987 Mercury Classic Fifty 45 HP. Been having problems getting on plane, and won't throttle past 3000 RPM when in gear. Started happening after I had the carbs rebuilt. I had a stuck float, so there was gas pumping through the carb every time I turned the motor. I took the boat out today, and tried again. I fixed an electrical problem (bare wire on black/white from trigger). Thought that may have fixed it. Still have the problem. Started it up, and took the cover off to see what was going on while running. I now have fuel pumping out of a hole on in the bottom carb. the hole is on the upper right side of the carb, just above and to the right of the shutter plate. When started, the carb is sucking the gas through the shutter plate. When I pump the bulb, it won't get completely hard, and gas pumps out of the same hole. It looks like the top carb has a slotted screw in the same place, but it's hard to see. It looks like the bottom carb has an extra hole...the one that all the gas is coming from. I believe this to be the cause of my bogging/RPM problem. When I pulled the plugs, the #4 cylinder is washed clean. This would confirm WAY too much fuel is getting to that cylinder. Not sure what to do next, or what this hole in my carb does? Any help/guidance would be greatly appreciated. AC.