I'm still having that nightmare..
I got mine used and it used a little oil at first, then it kept getting worse.. when I tore it down finally I found the bottom oil rings had lost their tension and collapsed to the same size as the piston.
Odd part was I had decent compression,95# on both sides. oil was not going into carb from the PCV.
Only smoked for a few seconds maybe 30 or so,...on start up, but would quit. I parked it shortly after this Vid I should have it running soon ..I bought another tractor for the engine cheaper than the rebuild kit for this motor.