Per Old Git's advice, I went to bigger main and pilot jets. Had to lower the needle as this was too rich, but she idles like a dream now. BUT I'm gonna pop the plug out and check the top of the piston, given my sudden stoppage of recent note and my current noise and missing oil thread...
Funny, on the RT1 project, I used pretty old premix from my chainsaw supply to start it. Guess I'll dump that crap on the 70 or 80 fire ant mounds in my yard and put good, non-ethanol petrol in the tank next time I start it, which won't be for a couple weeks.
Funny-er, I don't remember buring up any pistons back in the 70s when I was beating these things up and down the substantial hills of Tallahassee, Florida. Could it be that things have changed since those halcyon days of bra-less ladies and Mary Jane?