I put in new plugs today. I was able to run it up and down the yard (20' back and forth on grass) and it would still idle after each pass. Still a lot of smoke, but the mixed gas in the tank is almost 50:1 which might be too much.
Here is what the new plug looked like after 5-6 minutes of running plus moving it 4-5 times.
The clutch sorta seemed like it engaged rather high...around 4K.