John, be sure to carefully examine the plugs in the metering jet 'wells'. If you turn the disassembled main body over, the metering well plugs will be the highest things you see. If these wells are cracked, gas will trickle out of these cracks, go into the base plate, and on into the intake manifold. This makes the engine run richer than it is supposed to and also drains the fuel bowl, making starting the engine a 'cranking' experience.
You can fix the suspect plugs with JB Weld.
