DTX

Thanks for your response. This carb has only 1 mixture adjustment screw. Before removing it I counted it being almost 2 turns open. That is the setting it has been running. I put it back to that setting when reassembled. But now there is no change or improvement when I turn that screw either direction trying to get a leaner mix.

There really was no rebuilding to the carb. Only the gasket sandwiched in between the carb and tank. There is a small linkage that hooks on the top choke flap and extends down into the gasket. Has a light spring on it. Somehow it operates that auto plastic choke flap at the top of the carb throat. There is anothe short but larger diameter spring that sits under the gasket into a recess in the tank top. Not sure what it does.
I have to adjust the throttle cable each time I have taken the top flywheel cover off or removed the carb. Setting it back properly is quite easy for me. The carb is really quite simple but the gasket and its diaphram functions with the springs is not familar to me.
I feel something had to break since the last time I ran it, it did not want to crank so easily. finally got it running then mowed about 15 min and it died and did not want to start again. Only runs as I described above. I am going to have to remove the carb and gasket and study it. Maybe I will spot something.