Went out for a ride this weekend and couldn't start my 98 YZ400. Noticed that the shaft going into the accelerator pump was not moving down into the pump when opening the throttle. I have a new pump cover and diaphram, so no problems there. If I empty the float bowl and pump cover, the shaft moves fine. When I fill the float bowl and turn the throttle, the shaft stops moving - leading me to believe the port on the carb through which the pump squirts fuel is clogged. I pulled off the float bowl and verified the pump does squirt fuel when not on the carb. Tried cleaning the port by spraying carb cleaner (no luck) and then passing fishing line, and a small piece of wire into the port on the body of the carb that the acc pump sprays into. Wire only goes in about and inch and then stops. Where does this port come out in the body of the carb? Shouldn't I be able to clear this port easily using this method?