I will try to take a picture for you tommorow. The hole in the front of the carb is the air inlet for the diaphram or pump. It needs to be open. I put a carbon fiber intake on mine, which you solder a tube into that hole, and a piece of fuel line goes into the carbon fiber intake. The intake is $40 I believe and makes setting the needles a lot easier and cleans up the midrange. I believe the throttle stop is still on the engine, and no problem to kill it with the throttle. There is a aluminum home made arm soldered to the arm on the carb, works fine.