The carb is on the tractor and it starts and runs good as long as you provide some choke. I will continue to operate it that way I guess. A new piston might help but I sure did not see any wear on it. I wish I had it apart again to determine how the pump works. I wonder how the gas flows from below the piston into the manifold and how the air gets to the piston and into the manifold causing the lean condition. I just hate to take if off again to find out! I wish there was a diagram somewhere that showed the gas and air circuits in this carb! Someone could do the Ford world a great service providing one since these are notorious problems as evidenced on this board. The extra rubber disc probably just bobbles around beneath the piston as it is held up by vacuum normally. It is a prefect fit into the recess machined in the bottom of the piston however and looks as if it were intended to be held in there although there is nothing to retain it unless it were just glued against the piston bottom. Strange! You sound like you have experience with these Hollies and I sure wish we could go through one together, I bet we could figure it out! Where are you located anyway?
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