I see, well hopefully you are enjoying retirement! Any help or thoughts you have would be appreciated, I"ve never had this much trouble and am at a loss at this point.
Yes the idle metering jet was broken off. I drilled out what was left of it, chased the threads and installed a new one.
Yes fuel inlet screen was removed and cleaned...entire carb was disassembled and cleaned when I rebuilt.
As best I can tell, the float has free travel and is not binding or rubbing on anything. I did have trouble with the needle sticking (rubber tipped as that is all I can fins). 3rd one I tried finally seemed to work.
The venturi was a little beat up, looks like its been dropped a few times before. Anyway tractor runs a little rough at idle, slightly better with idle adjusting screw all the way in. Tractor lacks power in 4th/5th gear, and also just randomly dies after its warmed up. Starts right back up after it dies with no choke. I have verified good fuel flow from the tank and adjusted the governor. Also checked for manifold/gasket leaks while tractor was running with propane torch.
My dad still thinks its a carb problem, at this point I am thinking ignition. Not sure what to start checking though...everything is new - plugs, wires, points, condenser, coil, alternator, battery and cables and wiring.